/*
- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2011 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @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
- * 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
* 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 */
/*
*
* @(#)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 <sys/systm.h>
#include <sys/ioctl.h>
#include <sys/proc_internal.h>
+#include <sys/proc.h>
#include <sys/kauth.h>
#include <sys/tty.h>
#include <sys/time.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 <machine/spl.h>
-#include <bsm/audit_kernel.h>
+#include <security/audit/audit.h>
#include <bsm/audit_kevents.h>
#include <mach/mach_types.h>
#include <kern/kalloc.h>
#include <kern/task.h>
#include <kern/thread.h>
+#include <kern/thread_call.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
+
+#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 <mach/mach_traps.h> /* init_process */
+#include <vm/vm_protos.h>
+
+#include <sys/sdt.h>
+
+extern boolean_t init_task_died;
extern char init_task_failure_data[];
-int exit1(struct proc *, int, int *);
-void proc_prepareexit(struct proc *p);
-void vfork_exit(struct proc *p, int rv);
-void vproc_exit(struct proc *p);
-__private_extern__ void munge_rusage(struct rusage *a_rusage_p, struct user_rusage *a_user_rusage_p);
+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 unix_syscall_return(int);
-void *get_bsduthreadarg(thread_t);
-void proc_exit(struct proc *p);
+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(struct task *task, exception_data_t code,
- mach_msg_type_number_t codeCnt);
+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(proc_t p, rusage_info_current *ru, int flavor);
/*
* NOTE: Source and target may *NOT* overlap!
* XXX Should share code with bsd/dev/ppc/unix_signal.c
*/
-static void
-siginfo_64to32(user_siginfo_t *in, siginfo_t *out)
+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_pid = in->si_pid;
out->si_uid = in->si_uid;
out->si_status = in->si_status;
- out->si_addr = CAST_DOWN(void *,in->si_addr);
+ 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(void *,in->si_value.sival_ptr);
+ out->si_value.sival_ptr = CAST_DOWN_EXPLICIT(user32_addr_t,in->si_value.sival_ptr);
out->si_band = in->si_band; /* range reduction */
- out->pad[0] = in->pad[0]; /* mcontext.ss.r1 */
+}
+
+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)));
+ }
}
/*
* Death of process.
*/
void
-exit(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 */
- thread_funnel_set(kernel_flock, FALSE);
thread_exception_return();
/* NOTREACHED */
while (TRUE)
* status and rusage for wait(). Check for child processes and orphan them.
*/
int
-exit1(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)
{
thread_t self = current_thread();
struct task *task = p->task;
- register int s;
struct uthread *ut;
+ int error = 0;
/*
* If a thread in this task has already
ut = get_bsdthread_info(self);
if (ut->uu_flag & UT_VFORK) {
- vfork_exit(p, rv);
- vfork_return(self, p->p_pptr, p , retval);
- unix_syscall_return(0);
- /* NOT REACHED */
+ if (!thread_can_terminate) {
+ return EINVAL;
+ }
+
+ vfork_exit(p, rv);
+ vfork_return(p , retval, p->p_pid);
+ unix_syscall_return(0);
+ /* NOT REACHED */
}
- AUDIT_SYSCALL_EXIT(0, p, ut); /* Exit is always successfull */
- 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, ((jetsam_flags & P_JETSAM_VNODE) ? 1 : 0));
+ 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) {
+ proc_transend(p, 1);
if (get_threadtask(self) != task) {
- signal_unlock(p);
+ proc_unlock(p);
return(0);
}
- signal_unlock(p);
+ proc_unlock(p);
+
thread_terminate(self);
- thread_funnel_set(kernel_flock, FALSE);
+ if (!thread_can_terminate) {
+ return 0;
+ }
+
thread_exception_return();
/* NOTREACHED */
}
sig_lock_to_exit(p);
}
- signal_unlock(p);
- if (p->p_pid == 1) {
+ if (p == initproc && current_proc() == p) {
+ proc_unlock(p);
printf("pid 1 exited (signal %d, exit %d)",
WTERMSIG(rv), WEXITSTATUS(rv));
- panic("init died\nState at Last Exception:\n\n%s",
+#if (DEVELOPMENT || DEBUG)
+ int err;
+ /*
+ * For debugging purposes, generate a core file of initproc before
+ * panicking. Leave at least 300 MB free on the root volume, and ignore
+ * the process's corefile ulimit.
+ */
+ if ((err = coredump(p, 300, 1)) != 0) {
+ printf("Failed to generate initproc core file: error %d", err);
+ } else {
+ printf("Generated initproc core file");
+ sync(p, (void *)NULL, (int *)NULL);
+ }
+#endif
+ init_task_died = TRUE;
+ panic("%s died\nState at Last Exception:\n\n%s",
+ (p->p_comm[0] != '\0' ?
+ p->p_comm :
+ "launchd"),
init_task_failure_data);
}
- s = splsched();
- p->p_flag |= P_WEXIT;
- splx(s);
- proc_prepareexit(p);
+ p->p_lflag |= P_LEXIT;
p->p_xstat = rv;
+ p->p_lflag |= jetsam_flags;
+
+ proc_transend(p, 1);
+ proc_unlock(p);
- /* task terminate will call proc_terminate and that cleans it up */
+ proc_prepareexit(p, rv, perf_notify);
+
+ /* Last thread to terminate will call proc_exit() */
task_terminate_internal(task);
return(0);
}
void
-proc_prepareexit(struct proc *p)
+proc_prepareexit(proc_t p, int rv, boolean_t perf_notify)
{
+ mach_exception_data_type_t code, subcode;
struct uthread *ut;
- exception_data_t code[EXCEPTION_CODE_MAX];
thread_t self = current_thread();
+ 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;
+ }
- code[0] = (exception_data_t)0xFF000001; /* Set terminate code */
- code[1] = (exception_data_t)p->p_pid; /* Pass out the pid */
- /* Notify the perf server */
- (void)sys_perf_notify(p->task, (exception_data_t)&code, 2);
+ /*
+ * 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(p, &rup->ri, RUSAGE_INFO_CURRENT);
+ 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.
* 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_INSERT_HEAD(&zombproc, p, p_list); /* Place onto zombproc. */
- LIST_REMOVE(p, p_hash);
+ /* 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,
- * 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);
+ proc_lock(p);
+ p->p_lflag &= ~(P_LTRACED | P_LPPWAIT);
p->p_sigignore = ~(sigcantmask);
- p->p_siglist = 0;
- ut = get_bsdthread_info(self);
ut->uu_siglist = 0;
- untimeout(realitexpire, (caddr_t)p->p_pid);
+ proc_unlock(p);
}
void
-proc_exit(struct proc *p)
+proc_exit(proc_t p)
{
- register struct proc *q, *nq, *pp;
+ proc_t q;
+ proc_t pp;
struct task *task = p->task;
- register int 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 = current_uthread();
+
+ proc_lock(p);
+ proc_transstart(p, 1, 0);
+ 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);
- /* This can happen if thread_terminate of the single thread
- * process
+#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);
- 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 helper actions or probes for the process.
+ */
+ if (p->p_dtrace_helpers != NULL) {
+ (*dtrace_helpers_cleanup)(p);
}
- p->p_lflag |= P_LPEXIT;
- /* XXX Zombie allocation may fail, in which case stats get lost */
- MALLOC_ZONE(p->p_ru, struct rusage *,
- sizeof (*p->p_ru), M_ZOMBIE, M_WAITOK);
+ /*
+ * 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
+
+ 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!
*/
- p->p_lflag |= P_LREFDRAIN;
- while (p->p_internalref) {
- p->p_lflag |= P_LREFDRAINWAIT;
- msleep(&p->p_internalref, (lck_mtx_t *)0, 0, "proc_refdrain", 0) ;
- }
- p->p_lflag &= ~P_LREFDRAIN;
- p->p_lflag |= P_LREFDEAD;
+ 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 );
*/
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);
+#endif
+#if SYSV_SEM
/* 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 */
+
+ sessp = proc_session(p);
+ if (SESS_LEADER(p, sessp)) {
- if (sp->s_ttyvp) {
+ if (sessp->s_ttyvp != NULLVP) {
struct vnode *ttyvp;
+ int ttyvid;
+ int cttyflag = 0;
struct vfs_context context;
+ struct tty *tp;
/*
* Controlling process.
* 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);
+ session_lock(sessp);
+ tp = SESSION_TP(sessp);
+ if ((tp != TTY_NULL) && (tp->t_session == sessp)) {
+ session_unlock(sessp);
+
/*
- * The tty could have been revoked
- * if we blocked.
+ * We're going to SIGHUP the foreground process
+ * group. It can't change from this point on
+ * until the revoke is complete.
+ * The process group changes under both the tty
+ * lock and proc_list_lock but we need only one
*/
- context.vc_proc = p;
- context.vc_ucred = p->p_ucred;
- if (sp->s_ttyvp)
- VNOP_REVOKE(sp->s_ttyvp, REVOKEALL, &context);
+ tty_lock(tp);
+ ttysetpgrphup(tp);
+ tty_unlock(tp);
+
+ tty_pgsignal(tp, SIGHUP, 1);
+
+ session_lock(sessp);
+ tp = SESSION_TP(sessp);
}
- ttyvp = sp->s_ttyvp;
- sp->s_ttyvp = NULL;
- if (ttyvp) {
- vnode_rele(ttyvp);
+ 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);
+ VNOP_REVOKE(ttyvp, REVOKEALL, &context);
+ if (cttyflag) {
+ /*
+ * Release the extra usecount taken in cttyopen.
+ * usecount should be released after VNOP_REVOKE is called.
+ * This usecount was taken to ensure that
+ * the VNOP_REVOKE results in a close to
+ * the tty since cttyclose is a no-op.
+ */
+ vnode_rele(ttyvp);
+ }
+ vnode_put(ttyvp);
+ kauth_cred_unref(&context.vc_ucred);
+ ttyvp = NULLVP;
+ }
+ if (tp) {
+ /*
+ * This is cleared even if not set. This is also done in
+ * spec_close to ensure that the flag is cleared.
+ */
+ tty_lock(tp);
+ ttyclrpgrphup(tp);
+ tty_unlock(tp);
+
+ ttyfree(tp);
}
- /*
- * s_ttyp is not zero'd; we use this to indicate
- * that the session once had a controlling terminal.
- * (for logging and informational purposes)
- */
}
- 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);
-#if KTRACE
- /*
- * release trace file
- */
- p->p_traceflag = 0; /* don't trace the vnode_put() */
- if (p->p_tracep) {
- struct vnode *tvp = p->p_tracep;
- p->p_tracep = NULL;
- vnode_rele(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
- while (q = p->p_children.lh_first) {
- 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) {
+ /* 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;
+
/*
- * 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_t)q->sigwait_thread);
- clear_wait(q->sigwait_thread, THREAD_INTERRUPTED);
- threadsignal((thread_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();
+
+ /*
+ * Release reference to text vnode
+ */
+ tvp = p->p_textvp;
+ p->p_textvp = NULL;
+ if (tvp != NULLVP) {
+ vnode_rele(tvp);
+ }
+
/*
* 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) {
- *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;
+ 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;
- task_info_stuff = TASK_BASIC_INFO_COUNT;
- task_info(task, TASK_BASIC_INFO,
- (task_info_t)&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;
-
- task_ttimes_stuff = TASK_THREAD_TIMES_INFO_COUNT;
- task_info(task, TASK_THREAD_TIMES_INFO,
- (task_info_t)&ttimesinfo, &task_ttimes_stuff);
-
- 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, &p->p_stats->p_cru);
+ ruadd(&(p->p_ru->ru), &p->p_stats->p_cru);
}
/*
}
}
+ 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().
*/
- 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;
- 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;
- 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;
+ vm_purgeable_disown(p->task);
+
/*
* 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);
- KNOTE(&p->p_klist, NOTE_EXIT);
+ 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.
*/
- if (p->p_pptr->p_flag & P_NOCLDWAIT) {
- struct proc *opp = p->p_pptr;
+ pp = proc_parent(p);
+ if (pp->p_flag & P_NOCLDWAIT) {
+ 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.
*/
- if (p->p_ru != NULL)
- ruadd(&p->p_pptr->p_stats->p_cru, p->p_ru);
+ 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();
+ }
+ 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
+ */
- proc_reparent(p, initproc);
- /* If there are no more children wakeup parent */
- if (LIST_EMPTY(&opp->p_children))
- wakeup((caddr_t)opp);
+ 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;
+
+ /*
+ * 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 */
}
- /* 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_ucred->cr_ruid;
+ 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);
}
- /* mark as a zombie */
- p->p_stat = SZOMB;
-
- psignal(pp, SIGCHLD);
- /* and now wakeup the parent */
- wakeup((caddr_t)p->p_pptr);
+ proc_rele(pp);
- (void) thread_funnel_set(kernel_flock, funnel_state);
}
/*
- * reap_child_process
+ * reap_child_locked
*
* Description: Given a process from which all status information needed
* has already been extracted, if the process is a ptrace
* parent, else recover all resources remaining associated
* with it.
*
- * Parameters: struct proc *parent Parent of process being reaped
- * struct proc *child Process to reap
+ * 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_process(struct proc *parent, struct proc *child)
+reap_child_locked(proc_t parent, proc_t child, int deadparent, int reparentedtoinit, int locked, int droplock)
{
- struct proc *trace_parent; /* Traced parent process, if tracing */
- struct vnode *tvp; /* Traced vnode pointer, if used */
+ proc_t trace_parent = PROC_NULL; /* Traced parent process, if tracing */
+ 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 && (trace_parent = pfind(child->p_oppid))) {
+ if (child->p_oppid) {
+ int knote_hint;
+ pid_t oppid;
+
+ proc_lock(child);
+ oppid = child->p_oppid;
child->p_oppid = 0;
- proc_reparent(child, trace_parent);
- if (trace_parent != initproc) {
- trace_parent->si_pid = child->p_pid;
- trace_parent->si_status = child->p_xstat;
- trace_parent->si_code = CLD_CONTINUED;
- trace_parent->si_uid = child->p_ucred->cr_ruid;
+ 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);
+ }
+
+ /*
+ * 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);
+
+ if (trace_parent != PROC_NULL) {
+ proc_rele(trace_parent);
}
- psignal(trace_parent, SIGCHLD);
- wakeup((caddr_t)trace_parent);
- return (0);
}
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated-declarations"
+ proc_knote(child, NOTE_REAP);
+#pragma clang diagnostic pop
+
+ proc_knote_drain(child);
+
child->p_xstat = 0;
if (child->p_ru) {
- ruadd(&parent->p_stats->p_cru, 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);
}
+ AUDIT_SESSION_PROCEXIT(child);
+
/*
* 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(child->p_ucred->cr_ruid, -1);
+ (void)chgproccnt(kauth_cred_getruid(child->p_ucred), -1);
- /*
- * Free up credentials.
- */
- if (child->p_ucred != NOCRED) {
- kauth_cred_t ucr = child->p_ucred;
- child->p_ucred = NOCRED;
- kauth_cred_rele(ucr);
- }
+#if CONFIG_LCTX
+ ALLLCTX_LOCK;
+ leavelctx(child);
+ ALLLCTX_UNLOCK;
+#endif
/*
- * Release reference to text vnode
+ * Free up credentials.
*/
- tvp = child->p_textvp;
- child->p_textvp = NULL;
- if (tvp) {
- vnode_rele(tvp);
+ 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);
- child->p_lflag &= ~P_LWAITING;
+ /* 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
+ 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);
- nprocs--;
+ if ((locked == 1) && (droplock == 0))
+ proc_list_lock();
+
return (1);
}
int
wait1continue(int result)
{
- void *vt;
+ proc_t p;
thread_t thread;
+ uthread_t uth;
+ struct _wait4_data *wait4_data;
+ struct wait4_nocancel_args *uap;
int *retval;
- struct proc *p;
if (result)
return(result);
p = current_proc();
thread = current_thread();
- vt = get_bsduthreadarg(thread);
- retval = get_bsduthreadrval(thread);
- return(wait4((struct proc *)p, (struct wait4_args *)vt, retval));
+ uth = (struct uthread *)get_bsdthread_info(thread);
+
+ wait4_data = &uth->uu_kevent.uu_wait4_data;
+ uap = wait4_data->args;
+ retval = wait4_data->retval;
+ return(wait4_nocancel(p, uap, retval));
+}
+
+int
+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(struct proc *q, struct wait4_args *uap, register_t *retval)
+wait4_nocancel(proc_t q, struct wait4_nocancel_args *uap, int32_t *retval)
{
- register int nfound;
- register struct proc *p;
+ int nfound;
+ int sibling_count;
+ proc_t p;
int status, error;
+ uthread_t uth;
+ struct _wait4_data *wait4_data;
+
+ AUDIT_ARG(pid, uap->pid);
if (uap->pid == 0)
- uap->pid = -q->p_pgid;
+ uap->pid = -q->p_pgrpid;
loop:
+ proc_list_lock();
+loop1:
nfound = 0;
+ sibling_count = 0;
+
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 &&
- p->p_pgid != -(uap->pid))
+ p->p_pgrpid != -(uap->pid))
continue;
+
nfound++;
/* XXX This is racy because we don't get the lock!!!! */
- if (p->p_lflag & P_LWAITING) {
- (void)tsleep(&p->p_stat, PWAIT, "waitcoll", 0);
- goto loop;
+ if (p->p_listflag & P_LIST_WAITING) {
+ (void)msleep(&p->p_stat, proc_list_mlock, PWAIT, "waitcoll", 0);
+ goto loop1;
}
- p->p_lflag |= P_LWAITING; /* only allow single thread to wait() */
+ p->p_listflag |= P_LIST_WAITING; /* only allow single thread to wait() */
+
if (p->p_stat == SZOMB) {
+ 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
retval[0] = p->p_pid;
if (uap->status) {
- status = p->p_xstat; /* convert to int */
+ /* 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) {
- p->p_lflag &= ~P_LWAITING;
- wakeup(&p->p_stat);
- return (error);
- }
+ if (error)
+ goto out;
}
if (uap->rusage) {
if (p->p_ru == NULL) {
error = ENOMEM;
} else {
if (IS_64BIT_PROCESS(q)) {
- struct user_rusage my_rusage;
- munge_rusage(p->p_ru, &my_rusage);
+ 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 {
- error = copyout((caddr_t)p->p_ru,
+ struct user32_rusage my_rusage;
+ munge_user32_rusage(&p->p_ru->ru, &my_rusage);
+ error = copyout((caddr_t)&my_rusage,
uap->rusage,
- sizeof (struct rusage));
+ sizeof (my_rusage));
}
}
/* information unavailable? */
- if (error) {
- p->p_lflag &= ~P_LWAITING;
- wakeup(&p->p_stat);
- return (error);
- }
+ if (error)
+ goto out;
}
- /* Clean up */
- if (!reap_child_process(q, p)) {
- p->p_lflag &= ~P_LWAITING;
- wakeup(&p->p_stat);
+ /* 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.
+ */
+ if ( sibling_count == 0 ) {
+ int mask = sigmask(SIGCHLD);
+ uth = current_uthread();
+
+ 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);
+ }
}
+
+ /* Clean up */
+ (void)reap_child_locked(q, p, 0, reparentedtoinit, 0, 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;
if (uap->status) {
status = W_STOPCODE(p->p_xstat);
sizeof(status));
} else
error = 0;
- p->p_lflag &= ~P_LWAITING;
- wakeup(&p->p_stat);
- return (error);
+ 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
+
+ /* Prevent other process for waiting for this event */
+ OSBitAndAtomic(~((uint32_t)P_CONTINUED), &p->p_flag);
+ retval[0] = p->p_pid;
+ if (uap->status) {
+ status = W_STOPCODE(SIGCONT);
+ error = copyout((caddr_t)&status,
+ uap->status,
+ sizeof(status));
+ } else
+ error = 0;
+ goto out;
}
- p->p_lflag &= ~P_LWAITING;
+ p->p_listflag &= ~P_LIST_WAITING;
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);
+ }
if (uap->options & WNOHANG) {
retval[0] = 0;
+ proc_list_unlock();
return (0);
}
- if ((error = tsleep0((caddr_t)q, PWAIT | PCATCH, "wait", 0, wait1continue)))
+ /* Save arguments for continuation. Backing storage is in uthread->uu_arg, and will not be deallocated */
+ uth = current_uthread();
+ wait4_data = &uth->uu_kevent.uu_wait4_data;
+ wait4_data->args = uap;
+ wait4_data->retval = retval;
+
+ if ((error = msleep0((caddr_t)q, proc_list_mlock, PWAIT | PCATCH | PDROP, "wait", 0, wait1continue)))
return (error);
goto loop;
+out:
+ proc_list_lock();
+ p->p_listflag &= ~P_LIST_WAITING;
+ wakeup(&p->p_stat);
+ proc_list_unlock();
+ return (error);
}
+#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;
+ proc_t p;
thread_t thread;
+ uthread_t uth;
+ struct _waitid_data *waitid_data;
+ struct waitid_nocancel_args *uap;
int *retval;
- struct proc *p;
if (result)
- return(result);
+ return (result);
p = current_proc();
thread = current_thread();
- vt = get_bsduthreadarg(thread);
- retval = get_bsduthreadrval(thread);
- return(waitid((struct proc *)p, (struct waitid_args *)vt, retval));
+ uth = (struct uthread *)get_bsdthread_info(thread);
+
+ waitid_data = &uth->uu_kevent.uu_waitid_data;
+ uap = waitid_data->args;
+ retval = waitid_data->retval;
+ return(waitid_nocancel(p, uap, retval));
}
/*
*
* Parameters: uap->idtype one of P_PID, P_PGID, P_ALL
* uap->id pid_t or gid_t or ignored
- * uap->infop Address of signinfo_t struct in
+ * uap->infop Address of siginfo_t struct in
* user space into which to return status
* uap->options flag values
*
* !0 Error returning status to user space
*/
int
-waitid(struct proc *q, struct waitid_args *uap, register_t *retval)
+waitid(proc_t q, struct waitid_args *uap, int32_t *retval)
{
- user_siginfo_t collect64; /* siginfo data to return to caller */
+ __pthread_testcancel(1);
+ return (waitid_nocancel(q, (struct waitid_nocancel_args *)uap, retval));
+}
- register int nfound;
- register struct proc *p;
+int
+waitid_nocancel(proc_t q, struct waitid_nocancel_args *uap,
+ __unused int32_t *retval)
+{
+ user_siginfo_t siginfo; /* siginfo data to return to caller */
+ boolean_t caller64 = IS_64BIT_PROCESS(q);
+ int nfound;
+ proc_t p;
int error;
+ uthread_t uth;
+ struct _waitid_data *waitid_data;
+
+ 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;
+ }
loop:
+ proc_list_lock();
+loop1:
nfound = 0;
for (p = q->p_children.lh_first; p != 0; p = p->p_sibling.le_next) {
- switch(uap->idtype) {
+
+ 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_pgid != (pid_t)uap->id)
+ if (p->p_pgrpid != (pid_t)uap->id)
continue;
break;
case P_ALL: /* any child */
* Wait collision; go to sleep and restart; used to maintain
* the single return for waited process guarantee.
*/
- if (p->p_lflag & P_LWAITING) {
- (void)tsleep(&p->p_stat, PWAIT, "waitidcoll", 0);
- goto loop;
+ if (p->p_listflag & P_LIST_WAITING) {
+ (void) msleep(&p->p_stat, proc_list_mlock,
+ PWAIT, "waitidcoll", 0);
+ goto loop1;
}
- p->p_lflag |= P_LWAITING; /* mark busy */
+ p->p_listflag |= P_LIST_WAITING; /* mark busy */
nfound++;
- /*
- * Types of processes we are interested in
- *
- * XXX Don't know what to do for WCONTINUED?!?
- */
- switch(p->p_stat) {
+ 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;
- /* Collect "siginfo" information for caller */
- collect64.si_signo = 0;
- collect64.si_code = 0;
- collect64.si_errno = 0;
- collect64.si_pid = 0;
- collect64.si_uid = 0;
- collect64.si_addr = 0;
- collect64.si_status = p->p_xstat;
- collect64.si_band = 0;
-
- if (IS_64BIT_PROCESS(p)) {
- error = copyout((caddr_t)&collect64,
- uap->infop,
- sizeof(collect64));
- } else {
- siginfo_t collect;
- siginfo_64to32(&collect64,&collect);
- error = copyout((caddr_t)&collect,
- uap->infop,
- sizeof(collect));
- }
- /* information unavailable? */
- if (error) {
- p->p_lflag &= ~P_LWAITING;
- wakeup(&p->p_stat);
- return (error);
- }
+ if ((error = copyoutsiginfo(&siginfo,
+ caller64, uap->infop)) != 0)
+ goto out;
/* Prevent other process for waiting for this event? */
if (!(uap->options & WNOWAIT)) {
- /* Clean up */
- if (!reap_child_process(q, p)) {
- p->p_lflag &= ~P_LWAITING;
- wakeup(&p->p_stat);
- }
+ (void) reap_child_locked(q, p, 0, 0, 0, 0);
+ return (0);
}
-
- return (0);
+ goto out;
case SSTOP: /* Stopped */
/*
* If someone has already waited it, we lost a race
* to be the one to return status.
*/
- if ((p->p_flag & P_WAITED) != 0)
+ 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 this is not a traced process, and they haven't
- * indicated an interest in untraced processes, then
- * ignore this one.
- */
- if (!(p->p_flag & P_TRACED) && !(uap->options & WUNTRACED))
- break;
-
- /* Collect "siginfo" information for caller */
- collect64.si_signo = 0;
- collect64.si_code = 0;
- collect64.si_errno = 0;
- collect64.si_pid = 0;
- collect64.si_uid = 0;
- collect64.si_addr = 0;
- collect64.si_status = p->p_xstat;
- collect64.si_band = 0;
-
- if (IS_64BIT_PROCESS(p)) {
- error = copyout((caddr_t)&collect64,
- uap->infop,
- sizeof(collect64));
- } else {
- siginfo_t collect;
- siginfo_64to32(&collect64,&collect);
- error = copyout((caddr_t)&collect,
- uap->infop,
- sizeof(collect));
- }
- /* information unavailable? */
- if (error) {
- p->p_lflag &= ~P_LWAITING;
- wakeup(&p->p_stat);
- return (error);
- }
+ if ((error = copyoutsiginfo(&siginfo,
+ caller64, uap->infop)) != 0)
+ goto out;
/* Prevent other process for waiting for this event? */
if (!(uap->options & WNOWAIT)) {
- p->p_flag |= P_WAITED;
+ proc_lock(p);
+ p->p_lflag |= P_LWAITED;
+ proc_unlock(p);
}
+ goto out;
- p->p_lflag &= ~P_LWAITING;
- wakeup(&p->p_stat);
- return (0);
-
- default: /* All others */
- /* ...meaning Continued */
+ default: /* All other states => Continued */
if (!(uap->options & WCONTINUED))
break;
*/
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);
- /* Collect "siginfo" information for caller */
- collect64.si_signo = 0;
- collect64.si_code = 0;
- collect64.si_errno = 0;
- collect64.si_pid = 0;
- collect64.si_uid = 0;
- collect64.si_addr = 0;
- collect64.si_status = p->p_xstat;
- collect64.si_band = 0;
-
- if (IS_64BIT_PROCESS(p)) {
- error = copyout((caddr_t)&collect64,
- uap->infop,
- sizeof(collect64));
- } else {
- siginfo_t collect;
- siginfo_64to32(&collect64,&collect);
- error = copyout((caddr_t)&collect,
- uap->infop,
- sizeof(collect));
- }
- /* information unavailable? */
- if (error) {
- p->p_lflag &= ~P_LWAITING;
- wakeup(&p->p_stat);
- return (error);
- }
+ if ((error = copyoutsiginfo(&siginfo,
+ caller64, uap->infop)) != 0)
+ goto out;
/* Prevent other process for waiting for this event? */
if (!(uap->options & WNOWAIT)) {
- p->p_flag &= ~P_CONTINUED;
+ OSBitAndAtomic(~((uint32_t)P_CONTINUED),
+ &p->p_flag);
}
-
- p->p_lflag &= ~P_LWAITING;
- wakeup(&p->p_stat);
- return (0);
-
- break;
+ goto out;
}
-
+ ASSERT_LCK_MTX_OWNED(proc_list_mlock);
/* Not a process we are interested in; go on to next child */
- p->p_lflag &= ~P_LWAITING;
+
+ 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)
+
+ if (nfound == 0) {
+ proc_list_unlock();
return (ECHILD);
+ }
if (uap->options & WNOHANG) {
- retval[0] = 0;
+ 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);
}
- if ((error = tsleep0((caddr_t)q, PWAIT | PCATCH, "waitid", 0, waitidcontinue)))
+ /* Save arguments for continuation. Backing storage is in uthread->uu_arg, and will not be deallocated */
+ uth = current_uthread();
+ waitid_data = &uth->uu_kevent.uu_waitid_data;
+ waitid_data->args = uap;
+ waitid_data->retval = retval;
+
+ 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
-proc_reparent(struct proc *child, struct proc *parent)
+proc_reparentlocked(proc_t child, proc_t parent, int cansignal, int locked)
{
+ proc_t oldparent = PROC_NULL;
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;
- if (initproc == parent && child->p_stat == SZOMB)
- psignal(initproc, SIGCHLD);
-}
+ proc_list_unlock();
-/*
- * 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).
- */
-kern_return_t
-init_process(__unused struct init_process_args *args)
-{
- register struct proc *p = current_proc();
-
- AUDIT_MACH_SYSCALL_ENTER(AUE_INITPROCESS);
- if (suser(kauth_cred_get(), &p->p_acflag)) {
- AUDIT_MACH_SYSCALL_EXIT(KERN_NO_ACCESS);
- return(KERN_NO_ACCESS);
- }
-
- if (p->p_pid != 1 && p->p_pgid != p->p_pid)
- enterpgrp(p, p->p_pid, 0);
- p->p_flag |= P_SYSTEM;
-
- /*
- * 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;
-
- AUDIT_MACH_SYSCALL_EXIT(KERN_SUCCESS);
- return(KERN_SUCCESS);
+ if ((cansignal != 0) && (initproc == parent) && (child->p_stat == SZOMB))
+ psignal(initproc, SIGCHLD);
+ if (locked == 1)
+ proc_list_lock();
}
-
/*
* Exit: deallocate address space and other resources, change proc state
* to zombie, and unlink proc from allproc and parent's lists. Save exit
*/
void
-vfork_exit(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)
{
thread_t self = current_thread();
#ifdef FIXME
struct task *task = p->task;
#endif
- register int s;
struct uthread *ut;
- exception_data_t code[EXCEPTION_CODE_MAX];
/*
* If a thread in this task has already
*/
ut = get_bsdthread_info(self);
-#ifdef FIXME
- signal_lock(p);
- while (p->exit_thread != self) {
- if (sig_try_locked(p) <= 0) {
- if (get_threadtask(self) != task) {
- signal_unlock(p);
- return;
- }
- signal_unlock(p);
- thread_terminate(self);
- thread_funnel_set(kernel_flock, FALSE);
- thread_exception_return();
- /* NOTREACHED */
- }
- sig_lock_to_exit(p);
- }
- 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);
- }
-#endif /* FIXME */
- s = splsched();
- p->p_flag |= P_WEXIT;
- p->p_lflag |= P_LPEXIT;
- splx(s);
- code[0] = (exception_data_t)0xFF000001; /* Set terminate code */
- code[1] = (exception_data_t)p->p_pid; /* Pass out the pid */
- /* Notify the perf server */
- (void)sys_perf_notify(p->task, (exception_data_t)&code, 2);
+ 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;
+ }
+ 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);
+ }
/*
* Remove proc from allproc queue and from pidhash chain.
* 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_INSERT_HEAD(&zombproc, p, p_list); /* Place onto zombproc. */
- 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;
+ /* 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_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);
+
+ proc_spinlock(p);
+ }
+ proc_spinunlock(p);
+
+ thread_call_free(p->p_rcall);
+ p->p_rcall = NULL;
+
+ ut->uu_siglist = 0;
vproc_exit(p);
}
void
-vproc_exit(struct proc *p)
+vproc_exit(proc_t p)
{
- register struct proc *q, *nq, *pp;
+ proc_t q;
+ proc_t pp;
+
+ vnode_t tvp;
#ifdef FIXME
struct task *task = p->task;
#endif
+ struct pgrp * pg;
+ struct session *sessp;
+ struct rusage_superset *rup;
/* XXX Zombie allocation may fail, in which case stats get lost */
- MALLOC_ZONE(p->p_ru, struct rusage *,
- sizeof (*p->p_ru), M_ZOMBIE, M_WAITOK);
+ MALLOC_ZONE(rup, struct rusage_superset *,
+ sizeof (*rup), M_ZOMBIE, M_WAITOK);
+
+ proc_refdrain(p);
/*
* Close open files and release open-file table.
*/
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;
+ int ttyvid;
+ int cttyflag = 0;
struct vfs_context context;
+ struct tty *tp;
/*
* Controlling process.
* 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);
+ session_lock(sessp);
+ tp = SESSION_TP(sessp);
+ if ((tp != TTY_NULL) && (tp->t_session == sessp)) {
+ session_unlock(sessp);
+
/*
- * The tty could have been revoked
- * if we blocked.
+ * We're going to SIGHUP the foreground process
+ * group. It can't change from this point on
+ * until the revoke is complete.
+ * The process group changes under both the tty
+ * lock and proc_list_lock but we need only one
*/
- context.vc_proc = p;
- context.vc_ucred = p->p_ucred;
- if (sp->s_ttyvp)
- VNOP_REVOKE(sp->s_ttyvp, REVOKEALL, &context);
+ tty_lock(tp);
+ ttysetpgrphup(tp);
+ tty_unlock(tp);
+
+ tty_pgsignal(tp, SIGHUP, 1);
+
+ session_lock(sessp);
+ tp = SESSION_TP(sessp);
}
- ttyvp = sp->s_ttyvp;
- sp->s_ttyvp = NULL;
- if (ttyvp) {
- vnode_rele(ttyvp);
+ 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);
+ VNOP_REVOKE(ttyvp, REVOKEALL, &context);
+ if (cttyflag) {
+ /*
+ * Release the extra usecount taken in cttyopen.
+ * usecount should be released after VNOP_REVOKE is called.
+ * This usecount was taken to ensure that
+ * the VNOP_REVOKE results in a close to
+ * the tty since cttyclose is a no-op.
+ */
+ vnode_rele(ttyvp);
+ }
+ vnode_put(ttyvp);
+ kauth_cred_unref(&context.vc_ucred);
+ ttyvp = NULLVP;
+ }
+ if (tp) {
+ /*
+ * This is cleared even if not set. This is also done in
+ * spec_close to ensure that the flag is cleared.
+ */
+ tty_lock(tp);
+ ttyclrpgrphup(tp);
+ tty_unlock(tp);
+
+ ttyfree(tp);
}
- /*
- * s_ttyp is not zero'd; we use this to indicate
- * that the session once had a controlling terminal.
- * (for logging and informational purposes)
- */
}
- 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;
-#if KTRACE
- /*
- * release trace file
- */
- p->p_traceflag = 0; /* don't trace the vnode_rele() */
- if (p->p_tracep) {
- struct vnode *tvp = p->p_tracep;
- p->p_tracep = NULL;
- vnode_rele(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);
+ }
- while (q = p->p_children.lh_first) {
- 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) {
- /*
- * 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_t)q->sigwait_thread);
- clear_wait(q->sigwait_thread, THREAD_INTERRUPTED);
- threadsignal((thread_t)q->sigwait_thread, SIGKILL, 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();
+ } else {
+ q->p_listflag |= P_LIST_DEADPARENT;
+ proc_reparentlocked(q, initproc, 0, 1);
}
- psignal(q, SIGKILL);
}
}
+ proc_childdrainend(p);
+ proc_list_unlock();
+
+ /*
+ * Release reference to text vnode
+ */
+ tvp = p->p_textvp;
+ p->p_textvp = NULL;
+ if (tvp != NULLVP) {
+ vnode_rele(tvp);
+ }
+
/*
* 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) {
- *p->p_ru = p->p_stats->p_ru;
- timerclear(&p->p_ru->ru_utime);
- timerclear(&p->p_ru->ru_stime);
+ if (rup != NULL) {
+ rup->ru = p->p_stats->p_ru;
+ timerclear(&rup->ru.ru_utime);
+ timerclear(&rup->ru.ru_stime);
#ifdef FIXME
if (task) {
- task_basic_info_data_t tinfo;
+ 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_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);
- 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,
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 */
- ruadd(p->p_ru, &p->p_stats->p_cru);
+ ruadd(&rup->ru, &p->p_stats->p_cru);
+
+ gather_rusage_info(p, &rup->ri, RUSAGE_INFO_CURRENT);
+ 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;
}
/*
}
}
+#if PSYNCH
+ pth_proc_hashdelete(p);
+#endif /* PSYNCH */
+
/*
* 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;
- 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;
- 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;
/*
/*
* 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_ucred->cr_ruid;
- }
- /* mark as a zombie */
- p->p_stat = SZOMB;
+ 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(p->p_pptr, SIGCHLD);
+ 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;
- /* and now wakeup the parent */
- wakeup((caddr_t)p->p_pptr);
+ /*
+ * 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 */
+ }
+ proc_rele(pp);
}
/*
* munge_rusage
* LP64 support - long is 64 bits if we are dealing with a 64 bit user
- * process. We munge the kernel (32 bit) version of rusage into the
+ * process. We munge the kernel version of rusage into the
* 64 bit version.
*/
__private_extern__ void
-munge_rusage(struct rusage *a_rusage_p, struct user_rusage *a_user_rusage_p)
+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_nvcsw = a_rusage_p->ru_nvcsw;
a_user_rusage_p->ru_nivcsw = a_rusage_p->ru_nivcsw;
}
+
+/* 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;
+}
projects / apple / xnu.git / blobdiff