xnu-2422.110.17.tar.gz

[apple/xnu.git] / bsd / kern / kern_exit.c

diff --git a/bsd/kern/kern_exit.c b/bsd/kern/kern_exit.c
index 25dc9ef7122edf290c3150770e7c49bf5771c637..1ef04170dd9bce0fd905e9b046ef535809424263 100644 (file)
--- a/bsd/kern/kern_exit.c
+++ b/bsd/kern/kern_exit.c
@@ -1,16 +1,19 @@
 /*
 /*

- * Copyright (c) 2000-2001 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2011 Apple Inc. All rights reserved.

  *
  *

- * @APPLE_LICENSE_HEADER_START@
- * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@

  * 
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in
  * 
  * This file contains Original Code and/or Modifications of Original Code
  * as defined in and that are subject to the Apple Public Source License
  * Version 2.0 (the 'License'). You may not use this file except in

- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ * 
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.

  * 
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * 
  * The Original Code and all software distributed under the License are
  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER


@@ -20,7 +23,7 @@
  * Please see the License for the specific language governing rights and
  * limitations under the License.
  * 
  * Please see the License for the specific language governing rights and
  * limitations under the License.
  * 

- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@

  */
 /* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */
 /*
  */
 /* Copyright (c) 1995, 1997 Apple Computer, Inc. All Rights Reserved */
 /*


@@ -62,6 +65,12 @@
  *
  *     @(#)kern_exit.c 8.7 (Berkeley) 2/12/94
  */
  *
  *     @(#)kern_exit.c 8.7 (Berkeley) 2/12/94
  */

+/*
+ * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
+ * support for mandatory and extensible security protections.  This notice
+ * is included in support of clause 2.2 (b) of the Apple Public License,
+ * Version 2.0.
+ */

  
 #include <machine/reg.h>
 #include <machine/psl.h>
  
 #include <machine/reg.h>
 #include <machine/psl.h>


@@ -71,50 +80,157 @@
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/ioctl.h>
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/ioctl.h>

+#include <sys/proc_internal.h>

 #include <sys/proc.h>
 #include <sys/proc.h>

+#include <sys/kauth.h>

 #include <sys/tty.h>
 #include <sys/time.h>
 #include <sys/resource.h>
 #include <sys/kernel.h>
 #include <sys/tty.h>
 #include <sys/time.h>
 #include <sys/resource.h>
 #include <sys/kernel.h>

-#include <sys/buf.h>

 #include <sys/wait.h>
 #include <sys/wait.h>

-#include <sys/file.h>
-#include <sys/vnode.h>
+#include <sys/file_internal.h>
+#include <sys/vnode_internal.h>

 #include <sys/syslog.h>
 #include <sys/malloc.h>
 #include <sys/resourcevar.h>
 #include <sys/ptrace.h>
 #include <sys/user.h>
 #include <sys/syslog.h>
 #include <sys/malloc.h>
 #include <sys/resourcevar.h>
 #include <sys/ptrace.h>
 #include <sys/user.h>

+#include <sys/aio_kern.h>
+#include <sys/sysproto.h>
+#include <sys/signalvar.h>
+#include <sys/kdebug.h>
+#include <sys/filedesc.h>      /* fdfree */
+#if SYSV_SHM
+#include <sys/shm_internal.h>  /* shmexit */
+#endif
+#include <sys/acct.h>          /* acct_process */
+
+#include <security/audit/audit.h>
+#include <bsm/audit_kevents.h>

 
 #include <mach/mach_types.h>
 
 #include <mach/mach_types.h>

+
+#include <kern/kern_types.h>
+#include <kern/kalloc.h>
+#include <kern/task.h>

 #include <kern/thread.h>
 #include <kern/thread.h>

-#include <kern/thread_act.h>
+#include <kern/thread_call.h>

 #include <kern/sched_prim.h>
 #include <kern/assert.h>
 #include <kern/sched_prim.h>
 #include <kern/assert.h>

-#if KTRACE   
-#include <sys/ktrace.h>
+#include <sys/codesign.h>
+
+#if VM_PRESSURE_EVENTS
+#include <kern/vm_pressure.h>

 #endif
 
 #endif
 

+#if CONFIG_MEMORYSTATUS
+#include <sys/kern_memorystatus.h>
+#endif
+
+#if CONFIG_DTRACE
+/* Do not include dtrace.h, it redefines kmem_[alloc/free] */
+extern void (*dtrace_fasttrap_exit_ptr)(proc_t);
+extern void (*dtrace_helpers_cleanup)(proc_t);
+extern void dtrace_lazy_dofs_destroy(proc_t);
+
+#include <sys/dtrace_ptss.h>
+#endif
+
+#if CONFIG_MACF
+#include <security/mac.h>
+#include <sys/syscall.h>
+#endif
+
+#include <mach/mach_types.h>
+#include <mach/task.h>
+#include <mach/thread_act.h>
+
+#include <sys/sdt.h>
+

 extern char init_task_failure_data[];
 extern char init_task_failure_data[];

-int exit1 __P((struct proc *, int, int *));
+void proc_prepareexit(proc_t p, int rv, boolean_t perf_notify);
+void vfork_exit(proc_t p, int rv);
+void vproc_exit(proc_t p);
+__private_extern__ void munge_user64_rusage(struct rusage *a_rusage_p, struct user64_rusage *a_user_rusage_p);
+__private_extern__ void munge_user32_rusage(struct rusage *a_rusage_p, struct user32_rusage *a_user_rusage_p);
+static int reap_child_locked(proc_t parent, proc_t child, int deadparent, int reparentedtoinit, int locked, int droplock);
+
+/*
+ * Things which should have prototypes in headers, but don't
+ */
+void   *get_bsduthreadarg(thread_t);
+void   proc_exit(proc_t p);
+int    wait1continue(int result);
+int    waitidcontinue(int result);
+int    *get_bsduthreadrval(thread_t);
+kern_return_t sys_perf_notify(thread_t thread, int pid);
+kern_return_t task_exception_notify(exception_type_t exception,
+       mach_exception_data_type_t code, mach_exception_data_type_t subcode);
+void   delay(int);
+void gather_rusage_info_v2(proc_t p, struct rusage_info_v2 *ru, int flavor);
+
+/*
+ * NOTE: Source and target may *NOT* overlap!
+ * XXX Should share code with bsd/dev/ppc/unix_signal.c
+ */
+void
+siginfo_user_to_user32(user_siginfo_t *in, user32_siginfo_t *out)
+{
+       out->si_signo   = in->si_signo;
+       out->si_errno   = in->si_errno;
+       out->si_code    = in->si_code;
+       out->si_pid     = in->si_pid;
+       out->si_uid     = in->si_uid;
+       out->si_status  = in->si_status;
+       out->si_addr    = CAST_DOWN_EXPLICIT(user32_addr_t,in->si_addr);
+       /* following cast works for sival_int because of padding */
+       out->si_value.sival_ptr = CAST_DOWN_EXPLICIT(user32_addr_t,in->si_value.sival_ptr);
+       out->si_band    = in->si_band;                  /* range reduction */
+}
+
+void
+siginfo_user_to_user64(user_siginfo_t *in, user64_siginfo_t *out)
+{
+       out->si_signo   = in->si_signo;
+       out->si_errno   = in->si_errno;
+       out->si_code    = in->si_code;
+       out->si_pid     = in->si_pid;
+       out->si_uid     = in->si_uid;
+       out->si_status  = in->si_status;
+       out->si_addr    = in->si_addr;
+       /* following cast works for sival_int because of padding */
+       out->si_value.sival_ptr = in->si_value.sival_ptr;
+       out->si_band    = in->si_band;                  /* range reduction */
+}
+
+static int
+copyoutsiginfo(user_siginfo_t *native, boolean_t is64, user_addr_t uaddr)
+{
+       if (is64) {
+               user64_siginfo_t sinfo64;
+                               
+               bzero(&sinfo64, sizeof (sinfo64));
+               siginfo_user_to_user64(native, &sinfo64);
+               return (copyout(&sinfo64, uaddr, sizeof (sinfo64)));
+       } else {
+               user32_siginfo_t sinfo32;
+
+               bzero(&sinfo32, sizeof (sinfo32));
+               siginfo_user_to_user32(native, &sinfo32);
+               return (copyout(&sinfo32, uaddr, sizeof (sinfo32)));
+       }
+}

 
 /*
  * exit --
  *     Death of process.
  */
 
 /*
  * exit --
  *     Death of process.
  */

-struct exit_args {
-       int     rval;
-};

 void
 void

-exit(p, uap, retval)
-       struct proc *p;
-       struct exit_args *uap;
-       int *retval;
+exit(proc_t p, struct exit_args *uap, int *retval)

 {
        exit1(p, W_EXITCODE(uap->rval, 0), retval);
 
        /* drop funnel before we return */
 {
        exit1(p, W_EXITCODE(uap->rval, 0), retval);
 
        /* drop funnel before we return */

-       thread_funnel_set(kernel_flock, FALSE);

        thread_exception_return();
        /* NOTREACHED */
        while (TRUE)
        thread_exception_return();
        /* NOTREACHED */
        while (TRUE)


@@ -128,17 +244,19 @@ exit(p, uap, retval)
  * status and rusage for wait().  Check for child processes and orphan them.
  */
 int
  * status and rusage for wait().  Check for child processes and orphan them.
  */
 int

-exit1(p, rv, retval)
-       register struct proc *p;
-       int rv;
-       int * retval;
+exit1(proc_t p, int rv, int *retval)
+{
+       return exit1_internal(p, rv, retval, TRUE, TRUE, 0);
+}
+
+int
+exit1_internal(proc_t p, int rv, int *retval, boolean_t thread_can_terminate, boolean_t perf_notify,
+              int jetsam_flags)

 {
 {

-       register struct proc *q, *nq;

        thread_t self = current_thread();
        thread_t self = current_thread();

-       thread_act_t th_act_self = current_act();

        struct task *task = p->task;
        struct task *task = p->task;

-       register int i,s;

        struct uthread *ut;
        struct uthread *ut;

+       int error = 0;

 
        /*
         * If a thread in this task has already
 
        /*
         * If a thread in this task has already


@@ -146,70 +264,163 @@ exit1(p, rv, retval)
         * right here.
         */
 
         * right here.
         */
 

-        ut = get_bsdthread_info(th_act_self);
-        if (ut->uu_flag & P_VFORK) {
-                       (void)vfork_exit(p, rv);
-                       vfork_return(th_act_self, p->p_pptr, p , retval);
-                       unix_syscall_return(0);
-                       /* NOT REACHED */
+        ut = get_bsdthread_info(self);
+        if (ut->uu_flag & UT_VFORK) {
+               if (!thread_can_terminate) {
+                       return EINVAL;
+               }
+
+               vfork_exit(p, rv);
+               vfork_return(p , retval, p->p_pid);
+               unix_syscall_return(0);
+               /* NOT REACHED */

         }
         }

-        signal_lock(p);
+
+       /* 
+        * The parameter list of audit_syscall_exit() was augmented to
+        * take the Darwin syscall number as the first parameter,
+        * which is currently required by mac_audit_postselect().
+        */
+
+       /* 
+        * The BSM token contains two components: an exit status as passed
+        * to exit(), and a return value to indicate what sort of exit it 
+        * was.  The exit status is WEXITSTATUS(rv), but it's not clear
+        * what the return value is.
+        */
+       AUDIT_ARG(exit, WEXITSTATUS(rv), 0);
+       AUDIT_SYSCALL_EXIT(SYS_exit, p, ut, 0); /* Exit is always successfull */
+
+       DTRACE_PROC1(exit, int, CLD_EXITED);
+
+       /* mark process is going to exit and pull out of DBG/disk throttle */
+       /* TODO: This should be done after becoming exit thread */
+       proc_set_task_policy(p->task, THREAD_NULL, TASK_POLICY_ATTRIBUTE,
+                            TASK_POLICY_TERMINATED, TASK_POLICY_ENABLE);
+
+        proc_lock(p);
+       error = proc_transstart(p, 1);
+       if (error == EDEADLK) {
+               /* Temp: If deadlock error, then it implies multithreaded exec is
+                * in progress. Instread of letting exit continue and 
+                * corrupting the freed memory, let the exit thread
+                * return. This will save corruption in remote case.
+                */
+               proc_unlock(p);
+               if (current_proc() == p){
+                       if (p->exit_thread == self)
+                               printf("exit_thread failed to exit, leaving process %s[%d] in unkillable limbo\n",
+                                      p->p_comm, p->p_pid);
+                       thread_exception_return();
+               } else {
+                       /* external termination like jetsam */
+                       return(error);
+               }
+       }
+

        while (p->exit_thread != self) {
                if (sig_try_locked(p) <= 0) {
        while (p->exit_thread != self) {
                if (sig_try_locked(p) <= 0) {

-                       if (get_threadtask(th_act_self) != task) {
-                                signal_unlock(p);
+                       proc_transend(p, 1);
+                       if (get_threadtask(self) != task) {
+                               proc_unlock(p);

                                return(0);
                         }
                                return(0);
                         }

-                       signal_unlock(p);
-                       thread_terminate(th_act_self);
-                       thread_funnel_set(kernel_flock, FALSE);
+                       proc_unlock(p);
+                       
+                       thread_terminate(self);
+                       if (!thread_can_terminate) {
+                               return 0;
+                       }
+

                        thread_exception_return();
                        /* NOTREACHED */
                }
                sig_lock_to_exit(p);
        }
                        thread_exception_return();
                        /* NOTREACHED */
                }
                sig_lock_to_exit(p);
        }

-        signal_unlock(p);
-       if (p->p_pid == 1) {
+       if (p == initproc) {
+               proc_unlock(p);

                printf("pid 1 exited (signal %d, exit %d)",
                    WTERMSIG(rv), WEXITSTATUS(rv));
                printf("pid 1 exited (signal %d, exit %d)",
                    WTERMSIG(rv), WEXITSTATUS(rv));

-               panic("init died\nState at Last Exception:\n\n%s", 
+               panic("%s died\nState at Last Exception:\n\n%s", 
+                                                       (p->p_comm[0] != '\0' ?
+                                                               p->p_comm :
+                                                               "launchd"),

                                                        init_task_failure_data);
        }
 
                                                        init_task_failure_data);
        }
 

-       s = splsched();
-       p->p_flag |= P_WEXIT;
-       splx(s);
-       (void)proc_prepareexit(p);
+       p->p_lflag |= P_LEXIT;

        p->p_xstat = rv;
        p->p_xstat = rv;

+       p->p_lflag |= jetsam_flags;

 
 

-       /* task terminate will call proc_terminate and that cleans it up */
-       task_terminate_internal(task);
+       proc_transend(p, 1);
+       proc_unlock(p);

 
 

-       /*
-        * we come back and returns to AST which 
-        * should cleanup the rest 
-        */
-#if 0
-       if (task == current_task()) {
-               thread_exception_return();
-               /*NOTREACHED*/
-       }
+       proc_prepareexit(p, rv, perf_notify);
+
+       /* Last thread to terminate will call proc_exit() */
+       task_terminate_internal(task);

 
 

-       while (task == current_task()) {
-               thread_terminate_self();
-               /*NOTREACHED*/
-       }
-#endif

        return(0);
 }
 
 void
        return(0);
 }
 
 void

-proc_prepareexit(struct proc *p) 
+proc_prepareexit(proc_t p, int rv, boolean_t perf_notify) 

 {
 {

-       int s;
+       mach_exception_data_type_t code, subcode;

        struct uthread *ut;
        thread_t self = current_thread();
        struct uthread *ut;
        thread_t self = current_thread();

-       thread_act_t th_act_self = current_act();
+       ut = get_bsdthread_info(self);
+       struct rusage_superset *rup;
+
+       /* If a core should be generated, notify crash reporter */
+       if (hassigprop(WTERMSIG(rv), SA_CORE) || ((p->p_csflags & CS_KILLED) != 0)) {
+               /* 
+                * Workaround for processes checking up on PT_DENY_ATTACH:
+                * should be backed out post-Leopard (details in 5431025).
+                */
+               if ((SIGSEGV == WTERMSIG(rv)) && 
+                               (p->p_pptr->p_lflag & P_LNOATTACH)) {
+                       goto skipcheck;
+               }
+
+               /*
+                * Crash Reporter looks for the signal value, original exception
+                * type, and low 20 bits of the original code in code[0] 
+                * (8, 4, and 20 bits respectively). code[1] is unmodified. 
+                */
+               code = ((WTERMSIG(rv) & 0xff) << 24) |
+                       ((ut->uu_exception & 0x0f) << 20) | 
+                       ((int)ut->uu_code & 0xfffff);
+               subcode = ut->uu_subcode;
+               (void) task_exception_notify(EXC_CRASH, code, subcode);
+       }
+
+skipcheck:
+       /* Notify the perf server? */
+       if (perf_notify) {
+               (void)sys_perf_notify(self, p->p_pid);
+       }
+
+       /*
+        * Before this process becomes a zombie, stash resource usage
+        * stats in the proc for external observers to query
+        * via proc_pid_rusage().
+        *
+        * If the zombie allocation fails, just punt the stats.
+        */
+       MALLOC_ZONE(rup, struct rusage_superset *,
+                       sizeof (*rup), M_ZOMBIE, M_WAITOK);
+       if (rup != NULL) {
+               gather_rusage_info_v2(p, &rup->ri, RUSAGE_INFO_V2);
+               rup->ri.ri_phys_footprint = 0;
+               rup->ri.ri_proc_exit_abstime = mach_absolute_time();
+
+               /*
+                * Make the rusage_info visible to external observers
+                * only after it has been completely filled in.
+                */
+               p->p_ru = rup;
+       }

 
        /*
         * Remove proc from allproc queue and from pidhash chain.
 
        /*
         * Remove proc from allproc queue and from pidhash chain.


@@ -217,48 +428,141 @@ proc_prepareexit(struct proc *p)
         * Not doing causes things like mount() find this on allproc
         * in partially cleaned state.
         */
         * Not doing causes things like mount() find this on allproc
         * in partially cleaned state.
         */

+
+       proc_list_lock();
+
+#if CONFIG_MEMORYSTATUS
+       memorystatus_remove(p, TRUE);
+#endif
+

        LIST_REMOVE(p, p_list);
        LIST_REMOVE(p, p_list);

-       LIST_REMOVE(p, p_hash);
+       LIST_INSERT_HEAD(&zombproc, p, p_list); /* Place onto zombproc. */
+       /* will not be visible via proc_find */
+       p->p_listflag |= P_LIST_EXITED;
+
+       proc_list_unlock();
+

 
 #ifdef PGINPROF
        vmsizmon();
 #endif
        /*
         * If parent is waiting for us to exit or exec,
 
 #ifdef PGINPROF
        vmsizmon();
 #endif
        /*
         * If parent is waiting for us to exit or exec,

-        * P_PPWAIT is set; we will wakeup the parent below.
+        * P_LPPWAIT is set; we will wakeup the parent below.

         */
         */

-       p->p_flag &= ~(P_TRACED | P_PPWAIT);
-       p->p_sigignore = ~0;
-       p->p_siglist = 0;
-       ut = get_bsdthread_info(th_act_self);
+       proc_lock(p);
+       p->p_lflag &= ~(P_LTRACED | P_LPPWAIT);
+       p->p_sigignore = ~(sigcantmask);

        ut->uu_siglist = 0;
        ut->uu_siglist = 0;

-       untimeout(realitexpire, (caddr_t)p->p_pid);
+       proc_unlock(p);

 }
 
 void 
 }
 
 void 

-proc_exit(struct proc *p)
+proc_exit(proc_t p)

 {
 {

-       register struct proc *q, *nq, *pp;
-       thread_t self = current_thread();
-       thread_act_t th_act_self = current_act();
+       proc_t q;
+       proc_t pp;

        struct task *task = p->task;
        struct task *task = p->task;

-       register int i,s;
-       boolean_t funnel_state;
+       vnode_t tvp = NULLVP;
+       struct pgrp * pg;
+       struct session *sessp;
+       struct uthread * uth;
+       pid_t pid;
+       int exitval;
+       int knote_hint;
+
+       uth = (struct uthread *)get_bsdthread_info(current_thread());
+
+       proc_lock(p);
+       proc_transstart(p, 1);
+       if( !(p->p_lflag & P_LEXIT)) {
+               /*
+                * This can happen if a thread_terminate() occurs
+                * in a single-threaded process.
+                */
+               p->p_lflag |= P_LEXIT;
+               proc_transend(p, 1);
+               proc_unlock(p);
+               proc_prepareexit(p, 0, TRUE);   
+               (void) task_terminate_internal(task);
+               proc_lock(p);
+       } else {
+               proc_transend(p, 1);
+       }
+
+       p->p_lflag |= P_LPEXIT;
+
+       /*
+        * Other kernel threads may be in the middle of signalling this process.
+        * Wait for those threads to wrap it up before making the process
+        * disappear on them.
+        */
+       if ((p->p_lflag & P_LINSIGNAL) || (p->p_sigwaitcnt > 0)) {
+               p->p_sigwaitcnt++;
+               while ((p->p_lflag & P_LINSIGNAL) || (p->p_sigwaitcnt > 1)) 
+                       msleep(&p->p_sigmask, &p->p_mlock, PWAIT, "proc_sigdrain", NULL);
+               p->p_sigwaitcnt--;
+       }
+
+       proc_unlock(p);
+       pid = p->p_pid;
+       exitval = p->p_xstat;
+       KERNEL_DEBUG_CONSTANT_IST(KDEBUG_COMMON, 
+               BSDDBG_CODE(DBG_BSD_PROC, BSD_PROC_EXIT) | DBG_FUNC_START,
+               pid, exitval, 0, 0, 0);
+
+#if CONFIG_DTRACE
+       /*
+        * Free any outstanding lazy dof entries. It is imperative we
+        * always call dtrace_lazy_dofs_destroy, rather than null check
+        * and call if !NULL. If we NULL test, during lazy dof faulting
+        * we can race with the faulting code and proceed from here to
+        * beyond the helpers cleanup. The lazy dof faulting will then
+        * install new helpers which will never be cleaned up, and leak.
+        */
+       dtrace_lazy_dofs_destroy(p);

 
 

-       /* This can happen if thread_terminate of the single thread
-        * process 
+       /*
+        * Clean up any DTrace helper actions or probes for the process.

         */
         */

+       if (p->p_dtrace_helpers != NULL) {
+               (*dtrace_helpers_cleanup)(p);
+       }

 
 

-       funnel_state = thread_funnel_set(kernel_flock, TRUE);
-       if( !(p->p_flag & P_WEXIT)) {
-               s = splsched();
-               p->p_flag |= P_WEXIT;
-               splx(s);
-               proc_prepareexit(p);    
+       /*
+        * Clean up any DTrace probes associated with this process.
+        */
+       /*
+        * APPLE NOTE: We release ptss pages/entries in dtrace_fasttrap_exit_ptr(),
+        * call this after dtrace_helpers_cleanup()
+        */
+       proc_lock(p);
+       if (p->p_dtrace_probes && dtrace_fasttrap_exit_ptr) {
+               (*dtrace_fasttrap_exit_ptr)(p);

        }
        }

+       proc_unlock(p);
+#endif

 
 

-       MALLOC_ZONE(p->p_ru, struct rusage *,
-                       sizeof (*p->p_ru), M_ZOMBIE, M_WAITOK);
+       nspace_proc_exit(p);
+
+#if VM_PRESSURE_EVENTS
+       vm_pressure_proc_cleanup(p);
+#endif
+
+       /*
+        * need to cancel async IO requests that can be cancelled and wait for those
+        * already active.  MAY BLOCK!
+        */
+       
+       proc_refdrain(p);
+
+       /* if any pending cpu limits action, clear it */
+       task_clear_cpuusage(p->task, TRUE);
+
+       workqueue_mark_exiting(p);
+       workqueue_exit(p);
+
+       _aio_exit( p );

 
        /*
         * Close open files and release open-file table.
 
        /*
         * Close open files and release open-file table.


@@ -266,17 +570,40 @@ proc_exit(struct proc *p)
         */
        fdfree(p);
 
         */
        fdfree(p);
 

+       if (uth->uu_lowpri_window) {
+               /*
+                * task is marked as a low priority I/O type
+                * and the I/O we issued while in flushing files on close
+                * collided with normal I/O operations...
+                * no need to throttle this thread since its going away
+                * but we do need to update our bookeeping w/r to throttled threads
+                */
+               throttle_lowpri_io(0);
+       }
+
+#if SYSV_SHM

        /* Close ref SYSV Shared memory*/
        if (p->vm_shm)
                shmexit(p);
        /* Close ref SYSV Shared memory*/
        if (p->vm_shm)
                shmexit(p);

+#endif
+#if SYSV_SEM

        /* Release SYSV semaphores */
        semexit(p);
        /* Release SYSV semaphores */
        semexit(p);

+#endif

        
        

-       if (SESS_LEADER(p)) {
-               register struct session *sp = p->p_session;
+#if PSYNCH
+       pth_proc_hashdelete(p);
+#endif /* PSYNCH */

 
 

-               if (sp->s_ttyvp) {
+       sessp = proc_session(p);
+       if (SESS_LEADER(p, sessp)) {
+
+               if (sessp->s_ttyvp != NULLVP) {

                        struct vnode *ttyvp;
                        struct vnode *ttyvp;

+                       int ttyvid;
+                       int cttyflag = 0;
+                       struct vfs_context context;
+                       struct tty *tp;

 
                        /*
                         * Controlling process.
 
                        /*
                         * Controlling process.


@@ -284,114 +611,186 @@ proc_exit(struct proc *p)
                         * drain controlling terminal
                         * and revoke access to controlling terminal.
                         */
                         * drain controlling terminal
                         * and revoke access to controlling terminal.
                         */

-                       if (sp->s_ttyp->t_session == sp) {
-                               if (sp->s_ttyp->t_pgrp)
-                                       pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1);
-                               (void) ttywait(sp->s_ttyp);
-                               /*
-                                * The tty could have been revoked
-                                * if we blocked.
-                                */
-                               if (sp->s_ttyvp)
-                                       VOP_REVOKE(sp->s_ttyvp, REVOKEALL);
+                       session_lock(sessp);
+                       tp = SESSION_TP(sessp);
+                       if ((tp != TTY_NULL) && (tp->t_session == sessp)) {
+                               session_unlock(sessp);
+
+                               tty_pgsignal(tp, SIGHUP, 1);
+
+                               session_lock(sessp);
+                               tp = SESSION_TP(sessp);
+                       }
+                       cttyflag = sessp->s_flags & S_CTTYREF;
+                       sessp->s_flags &= ~S_CTTYREF;
+                       ttyvp = sessp->s_ttyvp;
+                       ttyvid = sessp->s_ttyvid;
+                       sessp->s_ttyvp = NULLVP;
+                       sessp->s_ttyvid = 0;
+                       sessp->s_ttyp = TTY_NULL;
+                       sessp->s_ttypgrpid = NO_PID;
+                       session_unlock(sessp);
+
+                       if ((ttyvp != NULLVP) && (vnode_getwithvid(ttyvp, ttyvid) == 0)) {
+                               if (tp != TTY_NULL) {
+                                       tty_lock(tp);
+                                       (void) ttywait(tp);
+                                       tty_unlock(tp);
+                               }
+                               context.vc_thread = proc_thread(p); /* XXX */
+                               context.vc_ucred = kauth_cred_proc_ref(p);
+                               vnode_rele(ttyvp);
+                               VNOP_REVOKE(ttyvp, REVOKEALL, &context);
+                               if (cttyflag) {
+                                       /*
+                                        * Release the extra usecount taken in cttyopen.
+                                        * usecount should be released after VNOP_REVOKE is called.
+                                        */
+                                       vnode_rele(ttyvp);
+                               }
+                               vnode_put(ttyvp);
+                               kauth_cred_unref(&context.vc_ucred);
+                               ttyvp = NULLVP;

                        }
                        }

-                       ttyvp = sp->s_ttyvp;
-                       sp->s_ttyvp = NULL;

                        if (ttyvp)
                        if (ttyvp)

-                               vrele(ttyvp);
-                       /*
-                        * s_ttyp is not zero'd; we use this to indicate
-                        * that the session once had a controlling terminal.
-                        * (for logging and informational purposes)
-                        */
+                               vnode_rele(ttyvp);
+                       if (tp)
+                               ttyfree(tp);

                }
                }

-               sp->s_leader = NULL;
+               session_lock(sessp);
+               sessp->s_leader = NULL;
+               session_unlock(sessp);

        }
        }

+       session_rele(sessp);
+
+       pg = proc_pgrp(p);
+       fixjobc(p, pg, 0);
+       pg_rele(pg);

 
 

-       fixjobc(p, p->p_pgrp, 0);

        p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
        (void)acct_process(p);
 
        p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
        (void)acct_process(p);
 

-#if KTRACE
-       /* 
-        * release trace file
-        */
-       p->p_traceflag = 0;     /* don't trace the vrele() */
-       if (p->p_tracep) {
-               struct vnode *tvp = p->p_tracep;
-               p->p_tracep = NULL;
-               vrele(tvp);
+       proc_list_lock();
+
+       if ((p->p_listflag & P_LIST_EXITCOUNT) == P_LIST_EXITCOUNT) {
+               p->p_listflag &= ~P_LIST_EXITCOUNT;
+               proc_shutdown_exitcount--;
+               if (proc_shutdown_exitcount == 0)
+                       wakeup(&proc_shutdown_exitcount);

        }
        }

-#endif

 
 

-       q = p->p_children.lh_first;
-       if (q)          /* only need this if any child is S_ZOMB */
-               wakeup((caddr_t) initproc);
-       for (; q != 0; q = nq) {
-               nq = q->p_sibling.le_next;
-               proc_reparent(q, initproc);
-               /*
-                * Traced processes are killed
-                * since their existence means someone is messing up.
-                */
-               if (q->p_flag & P_TRACED) {
-                       q->p_flag &= ~P_TRACED;
-                       if (q->sigwait_thread) {
-                               thread_t sig_shuttle;
+       /* wait till parentrefs are dropped and grant no more */
+       proc_childdrainstart(p);
+       while ((q = p->p_children.lh_first) != NULL) {
+               int reparentedtoinit = (q->p_listflag & P_LIST_DEADPARENT) ? 1 : 0;
+               if (q->p_stat == SZOMB) {
+                       if (p != q->p_pptr)
+                               panic("parent child linkage broken");
+                       /* check for sysctl zomb lookup */
+                       while ((q->p_listflag & P_LIST_WAITING) == P_LIST_WAITING) {
+                               msleep(&q->p_stat, proc_list_mlock, PWAIT, "waitcoll", 0);
+                       }
+                       q->p_listflag |= P_LIST_WAITING;
+                       /*
+                        * This is a named reference and it is not granted
+                        * if the reap is already in progress. So we get
+                        * the reference here exclusively and their can be
+                        * no waiters. So there is no need for a wakeup
+                        * after we are done.  Also the reap frees the structure
+                        * and the proc struct cannot be used for wakeups as well. 
+                        * It is safe to use q here as this is system reap
+                        */
+                       (void)reap_child_locked(p, q, 1, reparentedtoinit, 1, 0);
+               } else {
+                       /*
+                       * Traced processes are killed
+                       * since their existence means someone is messing up.
+                       */
+                       if (q->p_lflag & P_LTRACED) {
+                               struct proc *opp;

 
 

-                               sig_shuttle = (thread_t)getshuttle_thread((thread_act_t)q->sigwait_thread);

                                /*
                                /*

-                                * The sigwait_thread could be stopped at a
-                                * breakpoint. Wake it up to kill.
-                                * Need to do this as it could be a thread which is not
-                                * the first thread in the task. So any attempts to kill
-                                * the process would result into a deadlock on q->sigwait.
+                                * Take a reference on the child process to
+                                * ensure it doesn't exit and disappear between
+                                * the time we drop the list_lock and attempt
+                                * to acquire its proc_lock.

                                 */
                                 */

-                               thread_resume((thread_act_t)q->sigwait_thread);
-                               clear_wait(sig_shuttle, THREAD_INTERRUPTED);
-                               threadsignal((thread_act_t)q->sigwait_thread, SIGKILL, 0);
+                               if (proc_ref_locked(q) != q)
+                                       continue;
+
+                               proc_list_unlock();
+
+                               opp = proc_find(q->p_oppid);
+                               if (opp != PROC_NULL) {
+                                       proc_list_lock();
+                                       q->p_oppid = 0;
+                                       proc_list_unlock();
+                                       proc_reparentlocked(q, opp, 0, 0);
+                                       proc_rele(opp);
+                               } else {
+                                       /* original parent exited while traced */
+                                       proc_list_lock();
+                                       q->p_listflag |= P_LIST_DEADPARENT;
+                                       q->p_oppid = 0;
+                                       proc_list_unlock();
+                                       proc_reparentlocked(q, initproc, 0, 0);
+                               }
+
+                               proc_lock(q);
+                               q->p_lflag &= ~P_LTRACED;
+
+                               if (q->sigwait_thread) {
+                                       thread_t thread = q->sigwait_thread;
+
+                                       proc_unlock(q);
+                                       /*
+                                       * The sigwait_thread could be stopped at a
+                                       * breakpoint. Wake it up to kill.
+                                       * Need to do this as it could be a thread which is not
+                                       * the first thread in the task. So any attempts to kill
+                                       * the process would result into a deadlock on q->sigwait.
+                                       */
+                                       thread_resume(thread);
+                                       clear_wait(thread, THREAD_INTERRUPTED);
+                                       threadsignal(thread, SIGKILL, 0);
+                               } else {
+                                       proc_unlock(q);
+                               }
+
+                               psignal(q, SIGKILL);
+                               proc_list_lock();
+                               proc_rele_locked(q);
+                       } else {
+                               q->p_listflag |= P_LIST_DEADPARENT;
+                               proc_reparentlocked(q, initproc, 0, 1);

                        }
                        }

-                       psignal(q, SIGKILL);

                }
        }
 
                }
        }
 

+       proc_childdrainend(p);
+       proc_list_unlock();
+

        /*
        /*

-        * Save exit status and final rusage info, adding in child rusage
-        * info and self times.
+        * Release reference to text vnode

         */
         */

-       *p->p_ru = p->p_stats->p_ru;
-
-       timerclear(&p->p_ru->ru_utime);
-       timerclear(&p->p_ru->ru_stime);
-
-       if (task) {
-               task_basic_info_data_t tinfo;
-               task_thread_times_info_data_t ttimesinfo;
-               int task_info_stuff, task_ttimes_stuff;
-               struct timeval ut,st;
-
-               task_info_stuff = TASK_BASIC_INFO_COUNT;
-               task_info(task, TASK_BASIC_INFO,
-                         &tinfo, &task_info_stuff);
-               p->p_ru->ru_utime.tv_sec = tinfo.user_time.seconds;
-               p->p_ru->ru_utime.tv_usec = tinfo.user_time.microseconds;
-               p->p_ru->ru_stime.tv_sec = tinfo.system_time.seconds;
-               p->p_ru->ru_stime.tv_usec = tinfo.system_time.microseconds;
+       tvp = p->p_textvp;
+       p->p_textvp = NULL;
+       if (tvp != NULLVP) {
+               vnode_rele(tvp);
+       }

 
 

-               task_ttimes_stuff = TASK_THREAD_TIMES_INFO_COUNT;
-               task_info(task, TASK_THREAD_TIMES_INFO,
-                         &ttimesinfo, &task_ttimes_stuff);
+       /*
+        * Save exit status and final rusage info, adding in child rusage
+        * info and self times.  If we were unable to allocate a zombie
+        * structure, this information is lost.
+        */
+       if (p->p_ru != NULL) {
+           calcru(p, &p->p_stats->p_ru.ru_utime, &p->p_stats->p_ru.ru_stime, NULL);
+           p->p_ru->ru = p->p_stats->p_ru;

 
 

-               ut.tv_sec = ttimesinfo.user_time.seconds;
-               ut.tv_usec = ttimesinfo.user_time.microseconds;
-               st.tv_sec = ttimesinfo.system_time.seconds;
-               st.tv_usec = ttimesinfo.system_time.microseconds;
-               timeradd(&ut,&p->p_ru->ru_utime,&p->p_ru->ru_utime);
-               timeradd(&st,&p->p_ru->ru_stime,&p->p_ru->ru_stime);
+           ruadd(&(p->p_ru->ru), &p->p_stats->p_cru);

        }
 
        }
 

-       ruadd(p->p_ru, &p->p_stats->p_cru);
-

        /*
         * Free up profiling buffers.
         */
        /*
         * Free up profiling buffers.
         */


@@ -404,365 +803,860 @@ proc_exit(struct proc *p)
 
                for (; p1 != NULL; p1 = pn) {
                        pn = p1->pr_next;
 
                for (; p1 != NULL; p1 = pn) {
                        pn = p1->pr_next;

-                       kfree((vm_offset_t)p1, sizeof *p1);
+                       kfree(p1, sizeof *p1);

                }
        }
 
                }
        }
 

+       proc_spinlock(p);
+       if (thread_call_cancel(p->p_rcall))
+               p->p_ractive--;
+
+       while (p->p_ractive > 0) {
+               proc_spinunlock(p);
+               
+               delay(1);
+
+               proc_spinlock(p);
+       }
+       proc_spinunlock(p);
+
+       thread_call_free(p->p_rcall);
+       p->p_rcall = NULL;
+

        /*
         * Other substructures are freed from wait().
         */
        /*
         * Other substructures are freed from wait().
         */

-       FREE_ZONE(p->p_stats, sizeof *p->p_stats, M_SUBPROC);
+       FREE_ZONE(p->p_stats, sizeof *p->p_stats, M_PSTATS);

        p->p_stats = NULL;
 
        p->p_stats = NULL;
 

-       FREE_ZONE(p->p_sigacts, sizeof *p->p_sigacts, M_SUBPROC);
+       FREE_ZONE(p->p_sigacts, sizeof *p->p_sigacts, M_SIGACTS);

        p->p_sigacts = NULL;
 
        p->p_sigacts = NULL;
 

-       if (--p->p_limit->p_refcnt == 0)
-               FREE_ZONE(p->p_limit, sizeof *p->p_limit, M_SUBPROC);
+       proc_limitdrop(p, 1);

        p->p_limit = NULL;
 
        p->p_limit = NULL;
 

+

        /*
         * Finish up by terminating the task
         * and halt this thread (only if a
         * member of the task exiting).
         */
        p->task = TASK_NULL;
        /*
         * Finish up by terminating the task
         * and halt this thread (only if a
         * member of the task exiting).
         */
        p->task = TASK_NULL;

-       //task->proc = NULL;

        set_bsdtask_info(task, NULL);
 
        set_bsdtask_info(task, NULL);
 

+       knote_hint = NOTE_EXIT | (p->p_xstat & 0xffff);
+       proc_knote(p, knote_hint);
+
+       /* mark the thread as the one that is doing proc_exit
+        * no need to hold proc lock in uthread_free
+        */
+       uth->uu_flag |= UT_PROCEXIT;

        /*
         * Notify parent that we're gone.
         */
        /*
         * Notify parent that we're gone.
         */

-       if (p->p_pptr->p_flag & P_NOCLDWAIT) {
-               struct proc * pp = p->p_pptr;
+       pp = proc_parent(p);
+       if (pp->p_flag & P_NOCLDWAIT) {

 
 

-               proc_reparent(p, initproc);
-               /* If there are no more children wakeup parent */
-               if (LIST_EMPTY(&pp->p_children))
-                       wakeup((caddr_t)pp);
-       }
-       /* should be fine as parent proc would be initproc */
-       pp = p->p_pptr;
-       if (pp != initproc) {
-               pp->si_pid = p->p_pid;
-               pp->si_status = p->p_xstat;
-               pp->si_code = CLD_EXITED;
-               pp->si_uid = p->p_cred->p_ruid;
+               if (p->p_ru != NULL) {
+                       proc_lock(pp);
+#if 3839178
+               /*
+                * If the parent is ignoring SIGCHLD, then POSIX requires
+                * us to not add the resource usage to the parent process -
+                * we are only going to hand it off to init to get reaped.
+                * We should contest the standard in this case on the basis
+                * of RLIMIT_CPU.
+                */
+#else  /* !3839178 */
+               /*
+                * Add child resource usage to parent before giving
+                * zombie to init.  If we were unable to allocate a
+                * zombie structure, this information is lost.
+                */
+                       ruadd(&pp->p_stats->p_cru, &p->p_ru->ru);
+#endif /* !3839178 */
+                       update_rusage_info_child(&pp->p_stats->ri_child, &p->p_ru->ri);
+                       proc_unlock(pp);
+               }
+               
+               /* kernel can reap this one, no need to move it to launchd */
+               proc_list_lock();
+               p->p_listflag |= P_LIST_DEADPARENT;
+               proc_list_unlock();

        }
        }

-       psignal(pp, SIGCHLD);
+       if ((p->p_listflag & P_LIST_DEADPARENT) == 0 || p->p_oppid) {
+               if (pp != initproc) {
+                       proc_lock(pp);
+                       pp->si_pid = p->p_pid;
+                       pp->si_status = p->p_xstat;
+                       pp->si_code = CLD_EXITED;
+                       /*
+                        * p_ucred usage is safe as it is an exiting process
+                        * and reference is dropped in reap
+                        */
+                       pp->si_uid = kauth_cred_getruid(p->p_ucred);
+                       proc_unlock(pp);
+               }
+               /* mark as a zombie */
+               /* No need to take proc lock as all refs are drained and
+                * no one except parent (reaping ) can look at this.
+                * The write is to an int and is coherent. Also parent is
+                *  keyed off of list lock for reaping
+                */
+               KERNEL_DEBUG_CONSTANT_IST(KDEBUG_COMMON,
+                       BSDDBG_CODE(DBG_BSD_PROC, BSD_PROC_EXIT) | DBG_FUNC_END,
+                       pid, exitval, 0, 0, 0);
+               p->p_stat = SZOMB;
+               /* 
+                * The current process can be reaped so, no one
+                * can depend on this
+                */

 
 

+               psignal(pp, SIGCHLD);
+       
+               /* and now wakeup the parent */
+               proc_list_lock();
+               wakeup((caddr_t)pp);
+               proc_list_unlock();
+       } else {
+               /* should be fine as parent proc would be initproc */
+               /* mark as a zombie */
+               /* No need to take proc lock as all refs are drained and
+                * no one except parent (reaping ) can look at this.
+                * The write is to an int and is coherent. Also parent is
+                *  keyed off of list lock for reaping
+                */
+               proc_list_lock();
+               KERNEL_DEBUG_CONSTANT_IST(KDEBUG_COMMON,
+                       BSDDBG_CODE(DBG_BSD_PROC, BSD_PROC_EXIT) | DBG_FUNC_END,
+                       pid, exitval, 0, 0, 0);
+               /* check for sysctl zomb lookup */
+               while ((p->p_listflag & P_LIST_WAITING) == P_LIST_WAITING) {
+                       msleep(&p->p_stat, proc_list_mlock, PWAIT, "waitcoll", 0);
+               }
+               /* safe to use p as this is a system reap */
+               p->p_stat = SZOMB;
+               p->p_listflag |= P_LIST_WAITING;

 
 

-       /* Place onto zombproc. */
-       LIST_INSERT_HEAD(&zombproc, p, p_list);
-       p->p_stat = SZOMB;
+               /*
+                * This is a named reference and it is not granted
+                * if the reap is already in progress. So we get
+                * the reference here exclusively and their can be
+                * no waiters. So there is no need for a wakeup
+                * after we are done. AlsO  the reap frees the structure
+                * and the proc struct cannot be used for wakeups as well. 
+                * It is safe to use p here as this is system reap
+                */
+               (void)reap_child_locked(pp, p, 1, 0, 1, 1);
+               /* list lock dropped by reap_child_locked */
+       }
+       if (uth->uu_lowpri_window) {
+               /*
+                * task is marked as a low priority I/O type and we've
+                * somehow picked up another throttle during exit processing...
+                * no need to throttle this thread since its going away
+                * but we do need to update our bookeeping w/r to throttled threads
+                */
+               throttle_lowpri_io(0);
+       }

 
 

-       /* and now wakeup the parent */
-       wakeup((caddr_t)p->p_pptr);
+       proc_rele(pp);

 
 

-       (void) thread_funnel_set(kernel_flock, funnel_state);

 }
 
 
 }
 
 

-struct wait4_args {
-       int     pid;
-       int *status;
-       int options;
-       struct rusage *rusage;
-};
-
-#if COMPAT_43
-int
-owait(p, uap, retval)
-       struct proc *p;
-       void *uap;
-       int *retval;
+/*
+ * reap_child_locked
+ *
+ * Description:        Given a process from which all status information needed
+ *             has already been extracted, if the process is a ptrace
+ *             attach process, detach it and give it back to its real
+ *             parent, else recover all resources remaining associated
+ *             with it.
+ *
+ * Parameters: proc_t parent           Parent of process being reaped
+ *             proc_t child            Process to reap
+ *
+ * Returns:    0                       Process was not reaped because it
+ *                                     came from an attach
+ *             1                       Process was reaped
+ */
+static int
+reap_child_locked(proc_t parent, proc_t child, int deadparent, int reparentedtoinit, int locked, int droplock)

 {
 {

-       struct wait4_args *a;
+       proc_t trace_parent = PROC_NULL;        /* Traced parent process, if tracing */

 
 

-       a = (struct wait4_args *)get_bsduthreadarg(current_act());
+       if (locked == 1)
+               proc_list_unlock();
+       
+       /*
+        * If we got the child via a ptrace 'attach',
+        * we need to give it back to the old parent.
+        *
+        * Exception: someone who has been reparented to launchd before being
+        * ptraced can simply be reaped, refer to radar 5677288
+        *      p_oppid                  -> ptraced
+        *      trace_parent == initproc -> away from launchd
+        *      reparentedtoinit         -> came to launchd by reparenting
+        */
+       if (child->p_oppid) {
+               int knote_hint;
+               pid_t oppid;
+
+               proc_lock(child);
+               oppid = child->p_oppid;
+               child->p_oppid = 0;
+               knote_hint = NOTE_EXIT | (child->p_xstat & 0xffff);
+               proc_unlock(child);
+
+               if ((trace_parent = proc_find(oppid))
+                       && !((trace_parent == initproc) && reparentedtoinit)) {
+                               
+                       if (trace_parent != initproc) {
+                               /* 
+                                * proc internal fileds  and p_ucred usage safe 
+                                * here as child is dead and is not reaped or 
+                                * reparented yet 
+                                */
+                               proc_lock(trace_parent);
+                               trace_parent->si_pid = child->p_pid;
+                               trace_parent->si_status = child->p_xstat;
+                               trace_parent->si_code = CLD_CONTINUED;
+                               trace_parent->si_uid = kauth_cred_getruid(child->p_ucred);
+                               proc_unlock(trace_parent);
+                       }
+                       proc_reparentlocked(child, trace_parent, 1, 0);
+                       
+                       /* resend knote to original parent (and others) after reparenting */
+                       proc_knote(child, knote_hint);
+                       
+                       psignal(trace_parent, SIGCHLD);
+                       proc_list_lock();
+                       wakeup((caddr_t)trace_parent);
+                       child->p_listflag &= ~P_LIST_WAITING;
+                       wakeup(&child->p_stat);
+                       proc_list_unlock();
+                       proc_rele(trace_parent);
+                       if ((locked == 1) && (droplock == 0))
+                               proc_list_lock();
+                       return (0);
+               }

 
 

-       a->options = 0;
-       a->rusage = NULL;
-       a->pid = WAIT_ANY;
-       a->status = NULL;
-       return (wait1(p, a, retval, 1));
-}
+               /*
+                * If we can't reparent (e.g. the original parent exited while child was being debugged, or
+                * original parent is the same as the debugger currently exiting), we still need to satisfy
+                * the knote lifecycle for other observers on the system. While the debugger was attached,
+                * the NOTE_EXIT would not have been broadcast during initial child termination.
+                */
+               proc_knote(child, knote_hint);

 
 

-int
-wait4(p, uap, retval)
-       struct proc *p;
-       struct wait4_args *uap;
-       int *retval;
-{
-       return (wait1(p, uap, retval, 0));
-}
+               if (trace_parent != PROC_NULL) {
+                       proc_rele(trace_parent);
+               }
+       }
+       
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+       proc_knote(child, NOTE_REAP);
+#pragma clang diagnostic pop

 
 

-struct owait3_args {
-       int *status;
-       int options;
-       struct rusage *rusage;
-};
+       proc_knote_drain(child);

 
 

-int
-owait3(p, uap, retval)
-       struct proc *p;
-       struct owait3_args *uap;
-       int *retval;
-{
-       struct wait4_args *a;
+       child->p_xstat = 0;
+       if (child->p_ru) {
+               proc_lock(parent);
+#if 3839178
+               /*
+                * If the parent is ignoring SIGCHLD, then POSIX requires
+                * us to not add the resource usage to the parent process -
+                * we are only going to hand it off to init to get reaped.
+                * We should contest the standard in this case on the basis
+                * of RLIMIT_CPU.
+                */
+               if (!(parent->p_flag & P_NOCLDWAIT))
+#endif /* 3839178 */
+                       ruadd(&parent->p_stats->p_cru, &child->p_ru->ru);
+               update_rusage_info_child(&parent->p_stats->ri_child, &child->p_ru->ri);
+               proc_unlock(parent);
+               FREE_ZONE(child->p_ru, sizeof *child->p_ru, M_ZOMBIE);
+               child->p_ru = NULL;
+       } else {
+               printf("Warning : lost p_ru for %s\n", child->p_comm);
+       }

 
 

-       a = (struct wait4_args *)get_bsduthreadarg(current_act);
+       AUDIT_SESSION_PROCEXIT(child);

 
 

-       a->rusage = uap->rusage;
-       a->options = uap->options;
-       a->status = uap->status;
-       a->pid = WAIT_ANY;
+       /*
+        * Decrement the count of procs running with this uid.
+        * p_ucred usage is safe here as it is an exited process.
+        * and refernce is dropped after these calls down below
+        * (locking protection is provided by list lock held in chgproccnt)
+        */
+       (void)chgproccnt(kauth_cred_getruid(child->p_ucred), -1);

 
 

-       return (wait1(p, a, retval, 1));
-}
+#if CONFIG_LCTX
+       ALLLCTX_LOCK;
+       leavelctx(child);
+       ALLLCTX_UNLOCK;
+#endif

 
 

-#else
-#define        wait1   wait4
+       /*
+        * Free up credentials.
+        */
+       if (IS_VALID_CRED(child->p_ucred)) {
+               kauth_cred_unref(&child->p_ucred);
+       }
+
+       /*  XXXX Note NOT SAFE TO USE p_ucred from this point onwards */
+
+       /*
+        * Finally finished with old proc entry.
+        * Unlink it from its process group and free it.
+        */
+       leavepgrp(child);
+
+       proc_list_lock();
+       LIST_REMOVE(child, p_list);     /* off zombproc */
+       parent->p_childrencnt--;
+       LIST_REMOVE(child, p_sibling);
+       /* If there are no more children wakeup parent */
+       if ((deadparent != 0) && (LIST_EMPTY(&parent->p_children)))
+               wakeup((caddr_t)parent);        /* with list lock held */
+       child->p_listflag &= ~P_LIST_WAITING;
+       wakeup(&child->p_stat);
+
+       /* Take it out of process hash */
+       LIST_REMOVE(child, p_hash);
+       child->p_listflag &= ~P_LIST_INHASH;
+       proc_checkdeadrefs(child);
+       nprocs--;
+
+       if (deadparent) {
+               /*
+                * If a child zombie is being reaped because its parent
+                * is exiting, make sure we update the list flag
+                */
+               child->p_listflag |= P_LIST_DEADPARENT;
+       }
+
+       proc_list_unlock();
+
+#if CONFIG_FINE_LOCK_GROUPS
+       lck_mtx_destroy(&child->p_mlock, proc_mlock_grp);
+       lck_mtx_destroy(&child->p_fdmlock, proc_fdmlock_grp);
+#if CONFIG_DTRACE
+       lck_mtx_destroy(&child->p_dtrace_sprlock, proc_lck_grp);
+#endif
+       lck_spin_destroy(&child->p_slock, proc_slock_grp);
+#else /* CONFIG_FINE_LOCK_GROUPS */
+       lck_mtx_destroy(&child->p_mlock, proc_lck_grp);
+       lck_mtx_destroy(&child->p_fdmlock, proc_lck_grp);
+#if CONFIG_DTRACE
+       lck_mtx_destroy(&child->p_dtrace_sprlock, proc_lck_grp);

 #endif
 #endif

+       lck_spin_destroy(&child->p_slock, proc_lck_grp);
+#endif /* CONFIG_FINE_LOCK_GROUPS */
+       workqueue_destroy_lock(child);
+
+       FREE_ZONE(child, sizeof *child, M_PROC);
+       if ((locked == 1) && (droplock == 0))
+               proc_list_lock();
+
+       return (1);
+}
+

 
 int
 
 int

-wait1continue(result)
+wait1continue(int result)

 {
        void *vt;
 {
        void *vt;

-       thread_act_t thread;
+       thread_t thread;

        int *retval;
        int *retval;

-       struct proc *p;
+       proc_t p;

 
        if (result)
                return(result);
 
        p = current_proc();
 
        if (result)
                return(result);
 
        p = current_proc();

-       thread = current_act();
-       vt = (void *)get_bsduthreadarg(thread);
-       retval = (int *)get_bsduthreadrval(thread);
-       wait1((struct proc *)p, (struct wait4_args *)vt, retval, 0);
+       thread = current_thread();
+       vt = get_bsduthreadarg(thread);
+       retval = get_bsduthreadrval(thread);
+       return(wait4(p, (struct wait4_args *)vt, retval));

 }
 
 int
 }
 
 int

-wait1(q, uap, retval, compat)
-       register struct proc *q;
-       register struct wait4_args *uap;
-       register_t *retval;
-#if COMPAT_43
-       int compat;
-#endif
+wait4(proc_t q, struct wait4_args *uap, int32_t *retval)
+{
+       __pthread_testcancel(1);
+       return(wait4_nocancel(q, (struct wait4_nocancel_args *)uap, retval));
+}
+
+int
+wait4_nocancel(proc_t q, struct wait4_nocancel_args *uap, int32_t *retval)

 {
 {

-       register int nfound;
-       register struct proc *p, *t;
+       int nfound;
+       int sibling_count;
+       proc_t p;

        int status, error;
        int status, error;

-       struct vnode *tvp;

 
 

-retry:
+       AUDIT_ARG(pid, uap->pid);
+

        if (uap->pid == 0)
        if (uap->pid == 0)

-               uap->pid = -q->p_pgid;
+               uap->pid = -q->p_pgrpid;

 
 loop:
 
 loop:

+       proc_list_lock();
+loop1:

        nfound = 0;
        nfound = 0;

+       sibling_count = 0;
+

        for (p = q->p_children.lh_first; p != 0; p = p->p_sibling.le_next) {
        for (p = q->p_children.lh_first; p != 0; p = p->p_sibling.le_next) {

+               if ( p->p_sibling.le_next != 0 )
+                       sibling_count++;

                if (uap->pid != WAIT_ANY &&
                    p->p_pid != uap->pid &&
                if (uap->pid != WAIT_ANY &&
                    p->p_pid != uap->pid &&

-                   p->p_pgid != -(uap->pid))
+                   p->p_pgrpid != -(uap->pid))

                        continue;
                        continue;

+

                nfound++;
                nfound++;

-               if (p->p_flag & P_WAITING) {
-                       (void)tsleep(&p->p_stat, PWAIT, "waitcoll", 0);
-                       goto loop;
+
+               /* XXX This is racy because we don't get the lock!!!! */
+
+               if (p->p_listflag & P_LIST_WAITING) {
+                       (void)msleep(&p->p_stat, proc_list_mlock, PWAIT, "waitcoll", 0);
+                       goto loop1;

                }
                }

-               p->p_flag |= P_WAITING;   /* only allow single thread to wait() */
+               p->p_listflag |= P_LIST_WAITING;   /* only allow single thread to wait() */
+

 
                if (p->p_stat == SZOMB) {
 
                if (p->p_stat == SZOMB) {

-                       retval[0] = p->p_pid;
-#if COMPAT_43
-                       if (compat)
-                               retval[1] = p->p_xstat;
-                       else
+                       int reparentedtoinit = (p->p_listflag & P_LIST_DEADPARENT) ? 1 : 0;
+
+                       proc_list_unlock();
+#if CONFIG_MACF
+                       if ((error = mac_proc_check_wait(q, p)) != 0)
+                               goto out;

 #endif
 #endif

+                       retval[0] = p->p_pid;

                        if (uap->status) {
                        if (uap->status) {

-                               status = p->p_xstat;    /* convert to int */
-                               if (error = copyout((caddr_t)&status,
-                                   (caddr_t)uap->status,
-                                                   sizeof(status))) {
-                                       p->p_flag &= ~P_WAITING;
-                                       wakeup(&p->p_stat);
-                                       return (error);
-                               }
-                       }
-                       if (uap->rusage &&
-                           (error = copyout((caddr_t)p->p_ru,
-                           (caddr_t)uap->rusage,
-                                            sizeof (struct rusage)))) {
-                               p->p_flag &= ~P_WAITING;
-                               wakeup(&p->p_stat);
-                               return (error);
+                               /* Legacy apps expect only 8 bits of status */
+                               status = 0xffff & p->p_xstat;   /* convert to int */
+                               error = copyout((caddr_t)&status,
+                                                       uap->status,
+                                                   sizeof(status));
+                               if (error) 
+                                       goto out;

                        }
                        }

-                       /*
-                        * If we got the child via a ptrace 'attach',
-                        * we need to give it back to the old parent.
-                        */
-                       if (p->p_oppid && (t = pfind(p->p_oppid))) {
-                               p->p_oppid = 0;
-                               proc_reparent(p, t);
-                               if (t != initproc) {
-                                       t->si_pid = p->p_pid;
-                                       t->si_status = p->p_xstat;
-                                       t->si_code = CLD_CONTINUED;
-                                       t->si_uid = p->p_cred->p_ruid;
+                       if (uap->rusage) {
+                               if (p->p_ru == NULL) {
+                                       error = ENOMEM;
+                               } else {
+                                       if (IS_64BIT_PROCESS(q)) {
+                                               struct user64_rusage    my_rusage;
+                                               munge_user64_rusage(&p->p_ru->ru, &my_rusage);
+                                               error = copyout((caddr_t)&my_rusage,
+                                                       uap->rusage,
+                                                       sizeof (my_rusage));
+                                       }
+                                       else {
+                                               struct user32_rusage    my_rusage;
+                                               munge_user32_rusage(&p->p_ru->ru, &my_rusage);
+                                               error = copyout((caddr_t)&my_rusage,
+                                                       uap->rusage,
+                                                       sizeof (my_rusage));
+                                       }

                                }
                                }

-                               psignal(t, SIGCHLD);
-                               wakeup((caddr_t)t);
-                               p->p_flag &= ~P_WAITING;
-                               wakeup(&p->p_stat);
-                               return (0);
-                       }
-                       p->p_xstat = 0;
-                       if (p->p_ru) {
-                               ruadd(&q->p_stats->p_cru, p->p_ru);
-                               FREE_ZONE(p->p_ru, sizeof *p->p_ru, M_ZOMBIE);
-                               p->p_ru = NULL;
-                       } else {
-                               printf("Warning : lost p_ru for %s\n", p->p_comm);
+                               /* information unavailable? */
+                               if (error) 
+                                       goto out;

                        }
 
                        }
 

-                       /*
-                        * Decrement the count of procs running with this uid.
+                       /* Conformance change for 6577252.
+                        * When SIGCHLD is blocked and wait() returns because the status
+                        * of a child process is available and there are no other 
+                        * children processes, then any pending SIGCHLD signal is cleared.

                         */
                         */

-                       (void)chgproccnt(p->p_cred->p_ruid, -1);
-
-                       /*
-                        * Free up credentials.
-                        */
-                       if (--p->p_cred->p_refcnt == 0) {
-                               struct ucred *ucr = p->p_ucred;
-                               struct pcred *pcr;
-
-                               if (ucr != NOCRED) {
-                                       p->p_ucred = NOCRED;
-                                       crfree(ucr);
+                       if ( sibling_count == 0 ) {
+                               int mask = sigmask(SIGCHLD);
+                               uthread_t uth = (struct uthread *)get_bsdthread_info(current_thread());
+
+                               if ( (uth->uu_sigmask & mask) != 0 ) {
+                                       /* we are blocking SIGCHLD signals.  clear any pending SIGCHLD.
+                                        * This locking looks funny but it is protecting access to the 
+                                        * thread via p_uthlist.
+                                        */
+                                       proc_lock(q); 
+                                       uth->uu_siglist &= ~mask;       /* clear pending signal */
+                                       proc_unlock(q);

                                }
                                }

-                               pcr = p->p_cred;
-                               p->p_cred = NULL;
-                               FREE_ZONE(pcr, sizeof *pcr, M_SUBPROC);

                        }
                        }

+                       
+                       /* Clean up */
+                       (void)reap_child_locked(q, p, 0, reparentedtoinit, 0, 0);

 
 

-                       /*
-                        * Release reference to text vnode
-                        */
-                       tvp = p->p_textvp;
-                       p->p_textvp = NULL;
-                       if (tvp)
-                               vrele(tvp);
-
-                       /*
-                        * Finally finished with old proc entry.
-                        * Unlink it from its process group and free it.
-                        */
-                       leavepgrp(p);
-                       LIST_REMOVE(p, p_list); /* off zombproc */
-                       LIST_REMOVE(p, p_sibling);
-                       p->p_flag &= ~P_WAITING;
-                       FREE_ZONE(p, sizeof *p, M_PROC);
-                       nprocs--;
-                       wakeup(&p->p_stat);

                        return (0);
                }
                        return (0);
                }

-               if (p->p_stat == SSTOP && (p->p_flag & P_WAITED) == 0 &&
-                   (p->p_flag & P_TRACED || uap->options & WUNTRACED)) {
-                       p->p_flag |= P_WAITED;
+               if (p->p_stat == SSTOP && (p->p_lflag & P_LWAITED) == 0 &&
+                   (p->p_lflag & P_LTRACED || uap->options & WUNTRACED)) {
+                       proc_list_unlock();
+#if CONFIG_MACF
+                       if ((error = mac_proc_check_wait(q, p)) != 0)
+                               goto out;
+#endif
+                       proc_lock(p);
+                       p->p_lflag |= P_LWAITED;
+                       proc_unlock(p);

                        retval[0] = p->p_pid;
                        retval[0] = p->p_pid;

-#if COMPAT_43
-                       if (compat) {
-                               retval[1] = W_STOPCODE(p->p_xstat);
-                               error = 0;
+                       if (uap->status) {
+                               status = W_STOPCODE(p->p_xstat);
+                               error = copyout((caddr_t)&status,
+                                       uap->status,
+                                   sizeof(status));

                        } else
                        } else

+                               error = 0;
+                       goto out;
+               }
+               /*
+                * If we are waiting for continued processses, and this
+                * process was continued
+                */
+               if ((uap->options & WCONTINUED) &&
+                   (p->p_flag & P_CONTINUED)) {
+                       proc_list_unlock();
+#if CONFIG_MACF
+                       if ((error = mac_proc_check_wait(q, p)) != 0)
+                               goto out;

 #endif
 #endif

+
+                       /* Prevent other process for waiting for this event */
+                       OSBitAndAtomic(~((uint32_t)P_CONTINUED), &p->p_flag);
+                       retval[0] = p->p_pid;

                        if (uap->status) {
                        if (uap->status) {

-                               status = W_STOPCODE(p->p_xstat);
+                               status = W_STOPCODE(SIGCONT);

                                error = copyout((caddr_t)&status,
                                error = copyout((caddr_t)&status,

-                                   (caddr_t)uap->status,
+                                       uap->status,

                                    sizeof(status));
                        } else
                                error = 0;
                                    sizeof(status));
                        } else
                                error = 0;

-                       p->p_flag &= ~P_WAITING;
-                       wakeup(&p->p_stat);
-                       return (error);
+                       goto out;

                }
                }

-               p->p_flag &= ~P_WAITING;
+               p->p_listflag &= ~P_LIST_WAITING;

                wakeup(&p->p_stat);
        }
                wakeup(&p->p_stat);
        }

-       if (nfound == 0)
+       /* list lock is held when we get here any which way */
+       if (nfound == 0) {
+               proc_list_unlock();

                return (ECHILD);
                return (ECHILD);

+       }

 
        if (uap->options & WNOHANG) {
                retval[0] = 0;
 
        if (uap->options & WNOHANG) {
                retval[0] = 0;

+               proc_list_unlock();

                return (0);
        }
 
                return (0);
        }
 

-       if (error = tsleep0((caddr_t)q, PWAIT | PCATCH, "wait", 0, wait1continue))
+       if ((error = msleep0((caddr_t)q, proc_list_mlock, PWAIT | PCATCH | PDROP, "wait", 0, wait1continue)))

                return (error);
 
        goto loop;
                return (error);
 
        goto loop;

+out:
+       proc_list_lock();
+       p->p_listflag &= ~P_LIST_WAITING;
+       wakeup(&p->p_stat);
+       proc_list_unlock();
+       return (error);

 }
 
 }
 

-/*
- * make process 'parent' the new parent of process 'child'.
- */
-void
-proc_reparent(child, parent)
-       register struct proc *child;
-       register struct proc *parent;
+#if DEBUG
+#define ASSERT_LCK_MTX_OWNED(lock)     \
+                               lck_mtx_assert(lock, LCK_MTX_ASSERT_OWNED)
+#else
+#define ASSERT_LCK_MTX_OWNED(lock)     /* nothing */
+#endif
+
+int
+waitidcontinue(int result)

 {
 {

+       void *vt;
+       thread_t thread;
+       int *retval;

 
 

-       if (child->p_pptr == parent)
-               return;
+       if (result)
+               return (result);

 
 

-       LIST_REMOVE(child, p_sibling);
-       LIST_INSERT_HEAD(&parent->p_children, child, p_sibling);
-       child->p_pptr = parent;
+       thread = current_thread();
+       vt = get_bsduthreadarg(thread);
+       retval = get_bsduthreadrval(thread);
+       return (waitid(current_proc(), (struct waitid_args *)vt, retval));

 }
 
 /*
 }
 
 /*

- *     Make the current process an "init" process, meaning
- *     that it doesn't have a parent, and that it won't be
- *     gunned down by kill(-1, 0).
+ * Description:        Suspend the calling thread until one child of the process
+ *             containing the calling thread changes state.
+ *
+ * Parameters: uap->idtype             one of P_PID, P_PGID, P_ALL
+ *             uap->id                 pid_t or gid_t or ignored
+ *             uap->infop              Address of siginfo_t struct in
+ *                                     user space into which to return status
+ *             uap->options            flag values
+ *
+ * Returns:    0                       Success
+ *             !0                      Error returning status to user space

  */
  */

-kern_return_t
-init_process(void)
+int
+waitid(proc_t q, struct waitid_args *uap, int32_t *retval)
+{
+       __pthread_testcancel(1);
+       return (waitid_nocancel(q, (struct waitid_nocancel_args *)uap, retval));
+}
+
+int
+waitid_nocancel(proc_t q, struct waitid_nocancel_args *uap,
+       __unused int32_t *retval)

 {
 {

-       register struct proc *p = current_proc();
+       user_siginfo_t  siginfo;        /* siginfo data to return to caller */
+       boolean_t caller64 = IS_64BIT_PROCESS(q);
+       int nfound;
+       proc_t p;
+       int error;
+
+       if (uap->options == 0 ||
+           (uap->options & ~(WNOHANG|WNOWAIT|WCONTINUED|WSTOPPED|WEXITED)))
+               return (EINVAL);        /* bits set that aren't recognized */
+
+       switch (uap->idtype) {
+       case P_PID:     /* child with process ID equal to... */
+       case P_PGID:    /* child with process group ID equal to... */
+               if (((int)uap->id) < 0)
+                       return (EINVAL);
+               break;
+       case P_ALL:     /* any child */
+               break;
+       }

 
 

-       if (suser(p->p_ucred, &p->p_acflag))
-               return(KERN_NO_ACCESS);
+loop:
+       proc_list_lock();
+loop1:
+       nfound = 0;
+       for (p = q->p_children.lh_first; p != 0; p = p->p_sibling.le_next) {

 
 

-       if (p->p_pid != 1 && p->p_pgid != p->p_pid)
-               enterpgrp(p, p->p_pid, 0);
-       p->p_flag |= P_SYSTEM;
+               switch (uap->idtype) {
+               case P_PID:     /* child with process ID equal to... */
+                       if (p->p_pid != (pid_t)uap->id)
+                               continue;
+                       break;
+               case P_PGID:    /* child with process group ID equal to... */
+                       if (p->p_pgrpid != (pid_t)uap->id)
+                               continue;
+                       break;
+               case P_ALL:     /* any child */
+                       break;
+               }

 
 

-       /*
-        *      Take us out of the sibling chain, and
-        *      out of our parent's child chain.
-        */
-       LIST_REMOVE(p, p_sibling);
-       p->p_sibling.le_prev = NULL;
-       p->p_sibling.le_next = NULL;
-       p->p_pptr = kernproc;
+               /* XXX This is racy because we don't get the lock!!!! */
+
+               /*
+                * Wait collision; go to sleep and restart; used to maintain
+                * the single return for waited process guarantee.
+                */
+               if (p->p_listflag & P_LIST_WAITING) {
+                       (void) msleep(&p->p_stat, proc_list_mlock,
+                               PWAIT, "waitidcoll", 0);
+                       goto loop1;
+               }
+               p->p_listflag |= P_LIST_WAITING;                /* mark busy */
+
+               nfound++;
+
+               bzero(&siginfo, sizeof (siginfo));
+
+               switch (p->p_stat) {
+               case SZOMB:             /* Exited */
+                       if (!(uap->options & WEXITED))
+                               break;
+                       proc_list_unlock();
+#if CONFIG_MACF
+                       if ((error = mac_proc_check_wait(q, p)) != 0)
+                               goto out;
+#endif
+                       siginfo.si_signo = SIGCHLD;
+                       siginfo.si_pid = p->p_pid;
+                       siginfo.si_status = WEXITSTATUS(p->p_xstat);
+                       if (WIFSIGNALED(p->p_xstat)) {
+                               siginfo.si_code = WCOREDUMP(p->p_xstat) ?
+                                       CLD_DUMPED : CLD_KILLED;
+                       } else
+                               siginfo.si_code = CLD_EXITED;
+
+                       if ((error = copyoutsiginfo(&siginfo,
+                           caller64, uap->infop)) != 0)
+                               goto out;
+
+                       /* Prevent other process for waiting for this event? */
+                       if (!(uap->options & WNOWAIT)) {
+                               (void) reap_child_locked(q, p, 0, 0, 0, 0);
+                               return (0);
+                       }
+                       goto out;
+
+               case SSTOP:             /* Stopped */
+                       /*
+                        * If we are not interested in stopped processes, then
+                        * ignore this one.
+                        */
+                       if (!(uap->options & WSTOPPED))
+                               break;
+
+                       /*
+                        * If someone has already waited it, we lost a race
+                        * to be the one to return status.
+                        */
+                       if ((p->p_lflag & P_LWAITED) != 0)
+                               break;
+                       proc_list_unlock();
+#if CONFIG_MACF
+                       if ((error = mac_proc_check_wait(q, p)) != 0)
+                               goto out;
+#endif
+                       siginfo.si_signo = SIGCHLD;
+                       siginfo.si_pid = p->p_pid;
+                       siginfo.si_status = p->p_xstat; /* signal number */
+                       siginfo.si_code = CLD_STOPPED;
+
+                       if ((error = copyoutsiginfo(&siginfo,
+                           caller64, uap->infop)) != 0)
+                               goto out;
+
+                       /* Prevent other process for waiting for this event? */
+                       if (!(uap->options & WNOWAIT)) {
+                               proc_lock(p);
+                               p->p_lflag |= P_LWAITED;
+                               proc_unlock(p);
+                       }
+                       goto out;
+
+               default:                /* All other states => Continued */
+                       if (!(uap->options & WCONTINUED))
+                               break;
+
+                       /*
+                        * If the flag isn't set, then this process has not
+                        * been stopped and continued, or the status has
+                        * already been reaped by another caller of waitid().
+                        */
+                       if ((p->p_flag & P_CONTINUED) == 0)
+                               break;
+                       proc_list_unlock();
+#if CONFIG_MACF
+                       if ((error = mac_proc_check_wait(q, p)) != 0)
+                               goto out;
+#endif
+                       siginfo.si_signo = SIGCHLD;
+                       siginfo.si_code = CLD_CONTINUED;
+                       proc_lock(p);
+                       siginfo.si_pid = p->p_contproc;
+                       siginfo.si_status = p->p_xstat;
+                       proc_unlock(p);
+
+                       if ((error = copyoutsiginfo(&siginfo,
+                           caller64, uap->infop)) != 0)
+                               goto out;
+
+                       /* Prevent other process for waiting for this event? */
+                       if (!(uap->options & WNOWAIT)) {
+                               OSBitAndAtomic(~((uint32_t)P_CONTINUED),
+                                   &p->p_flag);
+                       }
+                       goto out;
+               }
+               ASSERT_LCK_MTX_OWNED(proc_list_mlock);
+
+               /* Not a process we are interested in; go on to next child */
+
+               p->p_listflag &= ~P_LIST_WAITING;
+               wakeup(&p->p_stat);
+       }
+       ASSERT_LCK_MTX_OWNED(proc_list_mlock);
+
+       /* No child processes that could possibly satisfy the request? */
+
+       if (nfound == 0) {
+               proc_list_unlock();
+               return (ECHILD);
+       }
+
+       if (uap->options & WNOHANG) {
+               proc_list_unlock();
+#if CONFIG_MACF
+               if ((error = mac_proc_check_wait(q, p)) != 0)
+                       return (error);
+#endif
+               /*
+                * The state of the siginfo structure in this case
+                * is undefined.  Some implementations bzero it, some
+                * (like here) leave it untouched for efficiency.
+                *
+                * Thus the most portable check for "no matching pid with
+                * WNOHANG" is to store a zero into si_pid before
+                * invocation, then check for a non-zero value afterwards.
+                */
+               return (0);
+       }

 
 

-       return(KERN_SUCCESS);
+       if ((error = msleep0(q, proc_list_mlock,
+           PWAIT | PCATCH | PDROP, "waitid", 0, waitidcontinue)) != 0)
+               return (error);
+
+       goto loop;
+out:
+       proc_list_lock();
+       p->p_listflag &= ~P_LIST_WAITING;
+       wakeup(&p->p_stat);
+       proc_list_unlock();
+       return (error);

 }
 
 }
 

+/*
+ * make process 'parent' the new parent of process 'child'.
+ */

 void
 void

-process_terminate_self(void)
+proc_reparentlocked(proc_t child, proc_t parent, int cansignal, int locked)

 {
 {

-       struct proc *p = current_proc();
+       proc_t oldparent = PROC_NULL;

 
 

-       if (p != NULL) {
-               exit1(p, W_EXITCODE(0, SIGKILL), (int *)NULL);
-               /*NOTREACHED*/
-       }
+       if (child->p_pptr == parent)
+               return;
+
+       if (locked == 0)
+               proc_list_lock();
+
+       oldparent = child->p_pptr;
+#if __PROC_INTERNAL_DEBUG
+       if (oldparent == PROC_NULL)
+               panic("proc_reparent: process %p does not have a parent\n", child);
+#endif
+
+       LIST_REMOVE(child, p_sibling);
+#if __PROC_INTERNAL_DEBUG
+       if (oldparent->p_childrencnt == 0)
+               panic("process children count already 0\n");
+#endif
+       oldparent->p_childrencnt--;
+#if __PROC_INTERNAL_DEBUG1
+       if (oldparent->p_childrencnt < 0)
+               panic("process children count -ve\n");
+#endif
+       LIST_INSERT_HEAD(&parent->p_children, child, p_sibling);
+       parent->p_childrencnt++;        
+       child->p_pptr = parent;
+       child->p_ppid = parent->p_pid;
+
+       proc_list_unlock();
+
+       if ((cansignal != 0) && (initproc == parent) && (child->p_stat == SZOMB))
+               psignal(initproc, SIGCHLD);
+       if (locked == 1)
+               proc_list_lock();

 }
 
 /*
 }
 
 /*


@@ -772,15 +1666,18 @@ process_terminate_self(void)
  */
 
 void
  */
 
 void

-vfork_exit(p, rv)
-       struct proc *p;
-       int rv;
+vfork_exit(proc_t p, int rv)
+{
+       vfork_exit_internal(p, rv, 0);
+}
+
+void
+vfork_exit_internal(proc_t p, int rv, int forceexit)

 {
 {

-       register struct proc *q, *nq;

        thread_t self = current_thread();
        thread_t self = current_thread();

-       thread_act_t th_act_self = current_act();
+#ifdef FIXME

        struct task *task = p->task;
        struct task *task = p->task;

-       register int i,s;
+#endif

        struct uthread *ut;
 
        /*
        struct uthread *ut;
 
        /*


@@ -789,70 +1686,99 @@ vfork_exit(p, rv)
         * right here.
         */
 
         * right here.
         */
 

-        ut = get_bsdthread_info(th_act_self);
-#ifdef FIXME
-        signal_lock(p);
-       while (p->exit_thread != self) {
-               if (sig_try_locked(p) <= 0) {
-                       if (get_threadtask(th_act_self) != task) {
-                                signal_unlock(p);
-                               return;
-                        }
-                       signal_unlock(p);
-                       thread_terminate(th_act_self);
-                       thread_funnel_set(kernel_flock, FALSE);
-                       thread_exception_return();
-                       /* NOTREACHED */
-               }
-               sig_lock_to_exit(p);
+        ut = get_bsdthread_info(self);
+
+
+       proc_lock(p);
+        if ((p->p_lflag & P_LPEXIT) == P_LPEXIT) {
+               /* 
+               * This happens when a parent exits/killed and vfork is in progress  
+               * other threads. But shutdown code for ex has already called exit1()
+               */
+               proc_unlock(p);
+               return;

        }
        }

-        signal_unlock(p);
-       if (p->p_pid == 1) {
-               printf("pid 1 exited (signal %d, exit %d)",
-                   WTERMSIG(rv), WEXITSTATUS(rv));
-panic("init died\nState at Last Exception:\n\n%s", init_task_failure_data);
+       p->p_lflag |= (P_LEXIT | P_LPEXIT);
+       proc_unlock(p);
+
+       if (forceexit == 0) {
+               /*
+                * parent of a vfork child has already called exit() and the 
+                * thread that has vfork in proress terminates. So there is no
+                * separate address space here and it has already been marked for
+                * termination. This was never covered before and could cause problems
+                * if we block here for outside code.
+                */
+               /* Notify the perf server */
+               (void)sys_perf_notify(self, p->p_pid);

        }
        }

-#endif /* FIXME */

 
 

-       s = splsched();
-       p->p_flag |= P_WEXIT;
-       splx(s);

        /*
         * Remove proc from allproc queue and from pidhash chain.
         * Need to do this before we do anything that can block.
         * Not doing causes things like mount() find this on allproc
         * in partially cleaned state.
         */
        /*
         * Remove proc from allproc queue and from pidhash chain.
         * Need to do this before we do anything that can block.
         * Not doing causes things like mount() find this on allproc
         * in partially cleaned state.
         */

+
+       proc_list_lock();
+
+#if CONFIG_MEMORYSTATUS
+       memorystatus_remove(p, TRUE);
+#endif
+

        LIST_REMOVE(p, p_list);
        LIST_REMOVE(p, p_list);

-       LIST_REMOVE(p, p_hash);
-       /*
-        * If parent is waiting for us to exit or exec,
-        * P_PPWAIT is set; we will wakeup the parent below.
-        */
-       p->p_flag &= ~(P_TRACED | P_PPWAIT);
-       p->p_sigignore = ~0;
-       p->p_siglist = 0;
+       LIST_INSERT_HEAD(&zombproc, p, p_list); /* Place onto zombproc. */
+       /* will not be visible via proc_find */
+       p->p_listflag |= P_LIST_EXITED;

 
 

-       ut->uu_siglist = 0;
-       untimeout(realitexpire, (caddr_t)p->p_pid);
+       proc_list_unlock();

 
 

+       proc_lock(p);

        p->p_xstat = rv;
        p->p_xstat = rv;

+       p->p_lflag &= ~(P_LTRACED | P_LPPWAIT);
+       p->p_sigignore = ~0;
+       proc_unlock(p);
+
+       proc_spinlock(p);
+       if (thread_call_cancel(p->p_rcall))
+               p->p_ractive--;
+
+       while (p->p_ractive > 0) {
+               proc_spinunlock(p);
+               
+               delay(1);

 
 

-       (void)vproc_exit(p);
+               proc_spinlock(p);
+       }
+       proc_spinunlock(p);
+
+       thread_call_free(p->p_rcall);
+       p->p_rcall = NULL;
+
+       ut->uu_siglist = 0;
+
+       vproc_exit(p);

 }
 
 void 
 }
 
 void 

-vproc_exit(struct proc *p)
+vproc_exit(proc_t p)

 {
 {

-       register struct proc *q, *nq, *pp;
-       thread_t self = current_thread();
-       thread_act_t th_act_self = current_act();
+       proc_t q;
+       proc_t pp;
+       
+       vnode_t tvp;
+#ifdef FIXME

        struct task *task = p->task;
        struct task *task = p->task;

-       register int i,s;
-       boolean_t funnel_state;
+#endif
+       struct pgrp * pg;
+       struct session *sessp;
+       struct rusage_superset *rup;

 
 

-       MALLOC_ZONE(p->p_ru, struct rusage *,
-                       sizeof (*p->p_ru), M_ZOMBIE, M_WAITOK);
+       /* XXX Zombie allocation may fail, in which case stats get lost */
+       MALLOC_ZONE(rup, struct rusage_superset *,
+                       sizeof (*rup), M_ZOMBIE, M_WAITOK);
+
+       proc_refdrain(p);

 
        /*
         * Close open files and release open-file table.
 
        /*
         * Close open files and release open-file table.


@@ -860,11 +1786,15 @@ vproc_exit(struct proc *p)
         */
        fdfree(p);
 
         */
        fdfree(p);
 

-       if (SESS_LEADER(p)) {
-               register struct session *sp = p->p_session;
-
-               if (sp->s_ttyvp) {
+       sessp = proc_session(p);
+       if (SESS_LEADER(p, sessp)) {
+               
+               if (sessp->s_ttyvp != NULLVP) {

                        struct vnode *ttyvp;
                        struct vnode *ttyvp;

+                       int ttyvid;
+                       int cttyflag = 0;
+                       struct vfs_context context;
+                       struct tty *tp;

 
                        /*
                         * Controlling process.
 
                        /*
                         * Controlling process.


@@ -872,99 +1802,177 @@ vproc_exit(struct proc *p)
                         * drain controlling terminal
                         * and revoke access to controlling terminal.
                         */
                         * drain controlling terminal
                         * and revoke access to controlling terminal.
                         */

-                       if (sp->s_ttyp->t_session == sp) {
-                               if (sp->s_ttyp->t_pgrp)
-                                       pgsignal(sp->s_ttyp->t_pgrp, SIGHUP, 1);
-                               (void) ttywait(sp->s_ttyp);
-                               /*
-                                * The tty could have been revoked
-                                * if we blocked.
-                                */
-                               if (sp->s_ttyvp)
-                                       VOP_REVOKE(sp->s_ttyvp, REVOKEALL);
+                       session_lock(sessp);
+                       tp = SESSION_TP(sessp);
+                       if ((tp != TTY_NULL) && (tp->t_session == sessp)) {
+                               session_unlock(sessp);
+
+                               tty_pgsignal(tp, SIGHUP, 1);
+
+                               session_lock(sessp);
+                               tp = SESSION_TP(sessp);

                        }
                        }

-                       ttyvp = sp->s_ttyvp;
-                       sp->s_ttyvp = NULL;
-                       if (ttyvp)
-                               vrele(ttyvp);
-                       /*
-                        * s_ttyp is not zero'd; we use this to indicate
-                        * that the session once had a controlling terminal.
-                        * (for logging and informational purposes)
-                        */
+                       cttyflag = sessp->s_flags & S_CTTYREF;
+                       sessp->s_flags &= ~S_CTTYREF;
+                       ttyvp = sessp->s_ttyvp;
+                       ttyvid = sessp->s_ttyvid;
+                       sessp->s_ttyvp = NULL;
+                       sessp->s_ttyvid = 0;
+                       sessp->s_ttyp = TTY_NULL;
+                       sessp->s_ttypgrpid = NO_PID;
+                       session_unlock(sessp);
+
+                      if ((ttyvp != NULLVP) && (vnode_getwithvid(ttyvp, ttyvid) == 0)) {
+                               if (tp != TTY_NULL) {
+                                       tty_lock(tp);
+                                       (void) ttywait(tp);
+                                       tty_unlock(tp);
+                               }
+                               context.vc_thread = proc_thread(p); /* XXX */
+                               context.vc_ucred = kauth_cred_proc_ref(p);
+                               vnode_rele(ttyvp);
+                               VNOP_REVOKE(ttyvp, REVOKEALL, &context);
+                               if (cttyflag) {
+                                       /*
+                                        * Release the extra usecount taken in cttyopen.
+                                        * usecount should be released after VNOP_REVOKE is called.
+                                        */
+                                       vnode_rele(ttyvp);
+                               }
+                               vnode_put(ttyvp);
+                               kauth_cred_unref(&context.vc_ucred);
+                               ttyvp = NULLVP;
+                       }
+                       if (ttyvp) 
+                               vnode_rele(ttyvp);
+                       if (tp)
+                               ttyfree(tp);

                }
                }

-               sp->s_leader = NULL;
+               session_lock(sessp);
+               sessp->s_leader = NULL;
+               session_unlock(sessp);

        }
        }

+       session_rele(sessp);
+
+       pg = proc_pgrp(p);
+       fixjobc(p, pg, 0);
+       pg_rele(pg);

 
 

-       fixjobc(p, p->p_pgrp, 0);

        p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
 
        p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
 

-#if KTRACE
-       /* 
-        * release trace file
-        */
-       p->p_traceflag = 0;     /* don't trace the vrele() */
-       if (p->p_tracep) {
-               struct vnode *tvp = p->p_tracep;
-               p->p_tracep = NULL;
-               vrele(tvp);
-       }
-#endif
+       proc_list_lock();
+       proc_childdrainstart(p);
+       while ((q = p->p_children.lh_first) != NULL) {
+               if (q->p_stat == SZOMB) {
+                       if (p != q->p_pptr)
+                               panic("parent child linkage broken");
+                       /* check for lookups by zomb sysctl */
+                       while ((q->p_listflag & P_LIST_WAITING) == P_LIST_WAITING) {
+                               msleep(&q->p_stat, proc_list_mlock, PWAIT, "waitcoll", 0);
+                       }
+                       q->p_listflag |= P_LIST_WAITING;
+                       /*
+                        * This is a named reference and it is not granted
+                        * if the reap is already in progress. So we get
+                        * the reference here exclusively and their can be
+                        * no waiters. So there is no need for a wakeup
+                        * after we are done. AlsO  the reap frees the structure
+                        * and the proc struct cannot be used for wakeups as well. 
+                        * It is safe to use q here as this is system reap
+                        */
+                       (void)reap_child_locked(p, q, 1, 0, 1, 0);
+               } else {
+                       /*
+                       * Traced processes are killed
+                       * since their existence means someone is messing up.
+                       */
+                       if (q->p_lflag & P_LTRACED) {
+                               struct proc *opp;
+
+                               proc_list_unlock();
+
+                               opp = proc_find(q->p_oppid);
+                               if (opp != PROC_NULL) {
+                                       proc_list_lock();
+                                       q->p_oppid = 0;
+                                       proc_list_unlock();
+                                       proc_reparentlocked(q, opp, 0, 0);
+                                       proc_rele(opp);
+                               } else {
+                                       /* original parent exited while traced */
+                                       proc_list_lock();
+                                       q->p_listflag |= P_LIST_DEADPARENT;
+                                       q->p_oppid = 0;
+                                       proc_list_unlock();
+                                       proc_reparentlocked(q, initproc, 0, 0);
+                               }

 
 

-       q = p->p_children.lh_first;
-       if (q)          /* only need this if any child is S_ZOMB */
-               wakeup((caddr_t) initproc);
-       for (; q != 0; q = nq) {
-               nq = q->p_sibling.le_next;
-               proc_reparent(q, initproc);
-               /*
-                * Traced processes are killed
-                * since their existence means someone is messing up.
-                */
-               if (q->p_flag & P_TRACED) {
-                       q->p_flag &= ~P_TRACED;
-                       if (q->sigwait_thread) {
-                               thread_t sig_shuttle;
+                               proc_lock(q);
+                               q->p_lflag &= ~P_LTRACED;
+
+                               if (q->sigwait_thread) {
+                                       thread_t thread = q->sigwait_thread;
+
+                                       proc_unlock(q);
+                                       /*
+                                       * The sigwait_thread could be stopped at a
+                                       * breakpoint. Wake it up to kill.
+                                       * Need to do this as it could be a thread which is not
+                                       * the first thread in the task. So any attempts to kill
+                                       * the process would result into a deadlock on q->sigwait.
+                                       */
+                                       thread_resume(thread);
+                                       clear_wait(thread, THREAD_INTERRUPTED);
+                                       threadsignal(thread, SIGKILL, 0);
+                               } else {
+                                       proc_unlock(q);
+                               }

 
 

-                               sig_shuttle = (thread_t) getshuttle_thread((thread_act_t)q->sigwait_thread);
-                               /*
-                                * The sigwait_thread could be stopped at a
-                                * breakpoint. Wake it up to kill.
-                                * Need to do this as it could be a thread which is not
-                                * the first thread in the task. So any attempts to kill
-                                * the process would result into a deadlock on q->sigwait.
-                                */
-                               thread_resume((thread_act_t)q->sigwait_thread);
-                               clear_wait(sig_shuttle, THREAD_INTERRUPTED);
-                               threadsignal((thread_act_t)q->sigwait_thread, SIGKILL, 0);
+                               psignal(q, SIGKILL);
+                               proc_list_lock();
+                       } else {
+                               q->p_listflag |= P_LIST_DEADPARENT;
+                               proc_reparentlocked(q, initproc, 0, 1);

                        }
                        }

-                       psignal(q, SIGKILL);

                }
        }
 
                }
        }
 

+       proc_childdrainend(p);
+       proc_list_unlock();
+

        /*
        /*

-        * Save exit status and final rusage info, adding in child rusage
-        * info and self times.
+        * Release reference to text vnode

         */
         */

-       *p->p_ru = p->p_stats->p_ru;
+       tvp = p->p_textvp;
+       p->p_textvp = NULL;
+       if (tvp != NULLVP) {
+               vnode_rele(tvp);
+       }

 
 

-       timerclear(&p->p_ru->ru_utime);
-       timerclear(&p->p_ru->ru_stime);
+       /*
+        * Save exit status and final rusage info, adding in child rusage
+        * info and self times.  If we were unable to allocate a zombie
+        * structure, this information is lost.
+        */
+       if (rup != NULL) {
+           rup->ru = p->p_stats->p_ru;
+           timerclear(&rup->ru.ru_utime);
+           timerclear(&rup->ru.ru_stime);

 
 #ifdef  FIXME
 
 #ifdef  FIXME

-       if (task) {
-               task_basic_info_data_t tinfo;
+           if (task) {
+               mach_task_basic_info_data_t tinfo;

                task_thread_times_info_data_t ttimesinfo;
                int task_info_stuff, task_ttimes_stuff;
                struct timeval ut,st;
 
                task_thread_times_info_data_t ttimesinfo;
                int task_info_stuff, task_ttimes_stuff;
                struct timeval ut,st;
 

-               task_info_stuff = TASK_BASIC_INFO_COUNT;
-               task_info(task, TASK_BASIC_INFO,
+               task_info_stuff = MACH_TASK_BASIC_INFO_COUNT;
+               task_info(task, MACH_TASK_BASIC_INFO,

                          &tinfo, &task_info_stuff);
                          &tinfo, &task_info_stuff);

-               p->p_ru->ru_utime.tv_sec = tinfo.user_time.seconds;
-               p->p_ru->ru_utime.tv_usec = tinfo.user_time.microseconds;
-               p->p_ru->ru_stime.tv_sec = tinfo.system_time.seconds;
-               p->p_ru->ru_stime.tv_usec = tinfo.system_time.microseconds;
+               p->p_ru->ru.ru_utime.tv_sec = tinfo.user_time.seconds;
+               p->p_ru->ru.ru_utime.tv_usec = tinfo.user_time.microseconds;
+               p->p_ru->ru.ru_stime.tv_sec = tinfo.system_time.seconds;
+               p->p_ru->ru.ru_stime.tv_usec = tinfo.system_time.microseconds;

 
                task_ttimes_stuff = TASK_THREAD_TIMES_INFO_COUNT;
                task_info(task, TASK_THREAD_TIMES_INFO,
 
                task_ttimes_stuff = TASK_THREAD_TIMES_INFO_COUNT;
                task_info(task, TASK_THREAD_TIMES_INFO,


@@ -974,12 +1982,23 @@ vproc_exit(struct proc *p)
                ut.tv_usec = ttimesinfo.user_time.microseconds;
                st.tv_sec = ttimesinfo.system_time.seconds;
                st.tv_usec = ttimesinfo.system_time.microseconds;
                ut.tv_usec = ttimesinfo.user_time.microseconds;
                st.tv_sec = ttimesinfo.system_time.seconds;
                st.tv_usec = ttimesinfo.system_time.microseconds;

-               timeradd(&ut,&p->p_ru->ru_utime,&p->p_ru->ru_utime);
-               timeradd(&st,&p->p_ru->ru_stime,&p->p_ru->ru_stime);
-       }
+               timeradd(&ut,&p->p_ru->ru.ru_utime,&p->p_ru->ru.ru_utime);
+                       timeradd(&st,&p->p_ru->ru.ru_stime,&p->p_ru->ru.ru_stime);
+           }

 #endif /* FIXME */
 
 #endif /* FIXME */
 

-       ruadd(p->p_ru, &p->p_stats->p_cru);
+           ruadd(&rup->ru, &p->p_stats->p_cru);
+
+               gather_rusage_info_v2(p, &rup->ri, RUSAGE_INFO_V2);
+               rup->ri.ri_phys_footprint = 0;
+               rup->ri.ri_proc_exit_abstime = mach_absolute_time();
+
+               /*
+                * Now that we have filled in the rusage info, make it
+                * visible to an external observer via proc_pid_rusage().
+                */
+               p->p_ru = rup;
+       }

 
        /*
         * Free up profiling buffers.
 
        /*
         * Free up profiling buffers.


@@ -993,21 +2012,24 @@ vproc_exit(struct proc *p)
 
                for (; p1 != NULL; p1 = pn) {
                        pn = p1->pr_next;
 
                for (; p1 != NULL; p1 = pn) {
                        pn = p1->pr_next;

-                       kfree((vm_offset_t)p1, sizeof *p1);
+                       kfree(p1, sizeof *p1);

                }
        }
 
                }
        }
 

+#if PSYNCH
+       pth_proc_hashdelete(p);
+#endif /* PSYNCH */
+

        /*
         * Other substructures are freed from wait().
         */
        /*
         * Other substructures are freed from wait().
         */

-       FREE_ZONE(p->p_stats, sizeof *p->p_stats, M_SUBPROC);
+       FREE_ZONE(p->p_stats, sizeof *p->p_stats, M_PSTATS);

        p->p_stats = NULL;
 
        p->p_stats = NULL;
 

-       FREE_ZONE(p->p_sigacts, sizeof *p->p_sigacts, M_SUBPROC);
+       FREE_ZONE(p->p_sigacts, sizeof *p->p_sigacts, M_SIGACTS);

        p->p_sigacts = NULL;
 
        p->p_sigacts = NULL;
 

-       if (--p->p_limit->p_refcnt == 0)
-               FREE_ZONE(p->p_limit, sizeof *p->p_limit, M_SUBPROC);
+       proc_limitdrop(p, 1);

        p->p_limit = NULL;
 
        /*
        p->p_limit = NULL;
 
        /*


@@ -1020,19 +2042,119 @@ vproc_exit(struct proc *p)
        /*
         * Notify parent that we're gone.
         */
        /*
         * Notify parent that we're gone.
         */

-       pp = p->p_pptr;
-       if (pp != initproc) {
-               pp->si_pid = p->p_pid;
-               pp->si_status = p->p_xstat;
-               pp->si_code = CLD_EXITED;
-               pp->si_uid = p->p_cred->p_ruid;
+       pp = proc_parent(p);
+       if ((p->p_listflag & P_LIST_DEADPARENT) == 0) {
+               if (pp != initproc) {
+                       proc_lock(pp);
+                       pp->si_pid = p->p_pid;
+                       pp->si_status = p->p_xstat;
+                       pp->si_code = CLD_EXITED;
+                       /*
+                        * p_ucred usage is safe as it is an exiting process
+                        * and reference is dropped in reap
+                        */
+                       pp->si_uid = kauth_cred_getruid(p->p_ucred);
+                       proc_unlock(pp);
+               }
+               /* mark as a zombie */
+               /* mark as a zombie */
+               /* No need to take proc lock as all refs are drained and
+                * no one except parent (reaping ) can look at this.
+                * The write is to an int and is coherent. Also parent is
+                *  keyed off of list lock for reaping
+                */
+               p->p_stat = SZOMB;
+
+               psignal(pp, SIGCHLD);
+
+               /* and now wakeup the parent */
+               proc_list_lock();
+               wakeup((caddr_t)pp);
+               proc_list_unlock();
+       } else {
+               proc_list_lock();
+               /* check for lookups by zomb sysctl */
+               while ((p->p_listflag & P_LIST_WAITING) == P_LIST_WAITING) {
+                       msleep(&p->p_stat, proc_list_mlock, PWAIT, "waitcoll", 0);
+               }
+               p->p_stat = SZOMB;
+               p->p_listflag |= P_LIST_WAITING;
+
+               /*
+                * This is a named reference and it is not granted
+                * if the reap is already in progress. So we get
+                * the reference here exclusively and their can be
+                * no waiters. So there is no need for a wakeup
+                * after we are done. AlsO  the reap frees the structure
+                * and the proc struct cannot be used for wakeups as well. 
+                * It is safe to use p here as this is system reap
+                */
+               (void)reap_child_locked(pp, p, 0, 0, 1, 1);
+               /* list lock dropped by reap_child_locked */

        }
        }

-       psignal(p->p_pptr, SIGCHLD);
+       proc_rele(pp);
+}

 
 

-       /* Place onto zombproc. */
-       LIST_INSERT_HEAD(&zombproc, p, p_list);
-       p->p_stat = SZOMB;
+                                               
+/*
+ * munge_rusage
+ *     LP64 support - long is 64 bits if we are dealing with a 64 bit user
+ *     process.  We munge the kernel version of rusage into the
+ *     64 bit version.
+ */
+__private_extern__  void 
+munge_user64_rusage(struct rusage *a_rusage_p, struct user64_rusage *a_user_rusage_p)
+{
+       /* timeval changes size, so utime and stime need special handling */
+       a_user_rusage_p->ru_utime.tv_sec = a_rusage_p->ru_utime.tv_sec;
+       a_user_rusage_p->ru_utime.tv_usec = a_rusage_p->ru_utime.tv_usec;
+       a_user_rusage_p->ru_stime.tv_sec = a_rusage_p->ru_stime.tv_sec;
+       a_user_rusage_p->ru_stime.tv_usec = a_rusage_p->ru_stime.tv_usec;
+       /*
+        * everything else can be a direct assign, since there is no loss
+        * of precision implied boing 32->64.
+        */
+       a_user_rusage_p->ru_maxrss = a_rusage_p->ru_maxrss;
+       a_user_rusage_p->ru_ixrss = a_rusage_p->ru_ixrss;
+       a_user_rusage_p->ru_idrss = a_rusage_p->ru_idrss;
+       a_user_rusage_p->ru_isrss = a_rusage_p->ru_isrss;
+       a_user_rusage_p->ru_minflt = a_rusage_p->ru_minflt;
+       a_user_rusage_p->ru_majflt = a_rusage_p->ru_majflt;
+       a_user_rusage_p->ru_nswap = a_rusage_p->ru_nswap;
+       a_user_rusage_p->ru_inblock = a_rusage_p->ru_inblock;
+       a_user_rusage_p->ru_oublock = a_rusage_p->ru_oublock;
+       a_user_rusage_p->ru_msgsnd = a_rusage_p->ru_msgsnd;
+       a_user_rusage_p->ru_msgrcv = a_rusage_p->ru_msgrcv;
+       a_user_rusage_p->ru_nsignals = a_rusage_p->ru_nsignals;
+       a_user_rusage_p->ru_nvcsw = a_rusage_p->ru_nvcsw;
+       a_user_rusage_p->ru_nivcsw = a_rusage_p->ru_nivcsw;
+}

 
 

-       /* and now wakeup the parent */
-       wakeup((caddr_t)p->p_pptr);
+/* For a 64-bit kernel and 32-bit userspace, munging may be needed */
+__private_extern__  void 
+munge_user32_rusage(struct rusage *a_rusage_p, struct user32_rusage *a_user_rusage_p)
+{
+       /* timeval changes size, so utime and stime need special handling */
+       a_user_rusage_p->ru_utime.tv_sec = a_rusage_p->ru_utime.tv_sec;
+       a_user_rusage_p->ru_utime.tv_usec = a_rusage_p->ru_utime.tv_usec;
+       a_user_rusage_p->ru_stime.tv_sec = a_rusage_p->ru_stime.tv_sec;
+       a_user_rusage_p->ru_stime.tv_usec = a_rusage_p->ru_stime.tv_usec;
+       /*
+        * everything else can be a direct assign. We currently ignore
+        * the loss of precision
+        */
+       a_user_rusage_p->ru_maxrss = a_rusage_p->ru_maxrss;
+       a_user_rusage_p->ru_ixrss = a_rusage_p->ru_ixrss;
+       a_user_rusage_p->ru_idrss = a_rusage_p->ru_idrss;
+       a_user_rusage_p->ru_isrss = a_rusage_p->ru_isrss;
+       a_user_rusage_p->ru_minflt = a_rusage_p->ru_minflt;
+       a_user_rusage_p->ru_majflt = a_rusage_p->ru_majflt;
+       a_user_rusage_p->ru_nswap = a_rusage_p->ru_nswap;
+       a_user_rusage_p->ru_inblock = a_rusage_p->ru_inblock;
+       a_user_rusage_p->ru_oublock = a_rusage_p->ru_oublock;
+       a_user_rusage_p->ru_msgsnd = a_rusage_p->ru_msgsnd;
+       a_user_rusage_p->ru_msgrcv = a_rusage_p->ru_msgrcv;
+       a_user_rusage_p->ru_nsignals = a_rusage_p->ru_nsignals;
+       a_user_rusage_p->ru_nvcsw = a_rusage_p->ru_nvcsw;
+       a_user_rusage_p->ru_nivcsw = a_rusage_p->ru_nivcsw;

 }
 }