/*
- * Copyright (c) 2000-2004 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2007 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
*
* @(#)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/sysproto.h>
#include <sys/signalvar.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 <bsm/audit_kevents.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>
+#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/thread_act.h>
#include <mach/mach_traps.h> /* init_process */
+#include <sys/sdt.h>
+
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);
+void proc_prepareexit(proc_t p, int rv);
+void vfork_exit(proc_t p, int rv);
+void vproc_exit(proc_t p);
__private_extern__ void munge_rusage(struct rusage *a_rusage_p, struct user_rusage *a_user_rusage_p);
+static int reap_child_locked(proc_t parent, proc_t child, int deadparent, 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 abnormal_exit_notify(mach_exception_data_type_t code,
+ mach_exception_data_type_t subcode);
+int in_shutdown(void);
+void workqueue_exit(struct proc *);
+void delay(int);
+
/*
* NOTE: Source and target may *NOT* overlap!
* XXX Should share code with bsd/dev/ppc/unix_signal.c
/* following cast works for sival_int because of padding */
out->si_value.sival_ptr = CAST_DOWN(void *,in->si_value.sival_ptr);
out->si_band = in->si_band; /* range reduction */
- out->pad[0] = in->pad[0]; /* mcontext.ss.r1 */
+ out->__pad[0] = in->pad[0]; /* mcontext.ss.r1 */
}
/*
* 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)
{
thread_t self = current_thread();
struct task *task = p->task;
- register int s;
struct uthread *ut;
/*
ut = get_bsdthread_info(self);
if (ut->uu_flag & UT_VFORK) {
vfork_exit(p, rv);
- vfork_return(self, p->p_pptr, p , retval);
+ 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().
+ */
+
+ AUDIT_SYSCALL_EXIT(SYS_exit, p, ut, 0); /* Exit is always successfull */
+
+ DTRACE_PROC1(exit, int, CLD_EXITED);
+
+ proc_lock(p);
while (p->exit_thread != self) {
if (sig_try_locked(p) <= 0) {
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);
thread_exception_return();
/* NOTREACHED */
}
sig_lock_to_exit(p);
}
- signal_unlock(p);
+#if !CONFIG_EMBEDDED /* BER_XXX */
if (p->p_pid == 1) {
+ 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",
+ panic("%s died\nState at Last Exception:\n\n%s",
+ (p->p_comm[0] != '\0' ?
+ p->p_comm :
+ "launchd"),
init_task_failure_data);
}
+#endif
- s = splsched();
- p->p_flag |= P_WEXIT;
- splx(s);
- proc_prepareexit(p);
+ p->p_lflag |= P_LEXIT;
p->p_xstat = rv;
+ proc_unlock(p);
+
+ proc_prepareexit(p, rv);
+
/* task terminate will call proc_terminate and that cleans it up */
task_terminate_internal(task);
}
void
-proc_prepareexit(struct proc *p)
+proc_prepareexit(proc_t p, int rv)
{
+ 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);
- code[0] = (exception_data_t)0xFF000001; /* Set terminate code */
- code[1] = (exception_data_t)p->p_pid; /* Pass out the pid */
+ /* If a core should be generated, notify crash reporter */
+ if (!in_shutdown() && hassigprop(WTERMSIG(rv), SA_CORE)) {
+ /*
+ * 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) abnormal_exit_notify(code, subcode);
+ }
+
+skipcheck:
/* Notify the perf server */
- (void)sys_perf_notify(p->task, (exception_data_t)&code, 2);
+ (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();
+
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;
+ boolean_t fstate;
+ vnode_t tvp = NULLVP;
+ struct pgrp * pg;
+ struct session *sessp;
+ struct uthread * uth;
/* This can happen if thread_terminate of the single thread
* process
*/
- 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);
+ uth = (struct uthread *)get_bsdthread_info(current_thread());
+
+ proc_lock(p);
+ if( !(p->p_lflag & P_LEXIT)) {
+ p->p_lflag |= P_LEXIT;
+ proc_unlock(p);
+ proc_prepareexit(p, 0);
+ proc_lock(p);
}
p->p_lflag |= P_LPEXIT;
+ proc_unlock(p);
+
+#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);
+
+ /*
+ * Clean up any DTrace helper actions or probes for the process.
+ */
+ if (p->p_dtrace_helpers != NULL) {
+ (*dtrace_helpers_cleanup)(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
+
/* 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);
* 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);
+
+ workqueue_exit(p);
_aio_exit( p );
*/
fdfree(p);
+#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;
+ sessp = proc_session(p);
+ if (SESS_LEADER(p, sessp)) {
- if (sp->s_ttyvp) {
+ /* Protected by funnel for tty accesses */
+ fstate = thread_funnel_set(kernel_flock, TRUE);
+
+ if (sessp->s_ttyvp != NULLVP) {
struct vnode *ttyvp;
+ int ttyvid;
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);
+ tp = sessp->s_ttyp;
+
+ if ((tp != TTY_NULL) && (tp->t_session == sessp)) {
+ tty_pgsignal(tp, SIGHUP, 1);
+ (void) ttywait(tp);
/*
* The tty could have been revoked
* if we blocked.
*/
- context.vc_proc = p;
- context.vc_ucred = p->p_ucred;
- if (sp->s_ttyvp)
- VNOP_REVOKE(sp->s_ttyvp, REVOKEALL, &context);
+
+ session_lock(sessp);
+ ttyvp = sessp->s_ttyvp;
+ ttyvid = sessp->s_ttyvid;
+ sessp->s_ttyvp = NULL;
+ sessp->s_ttyvid = 0;
+ sessp->s_ttyp = NULL;
+ sessp->s_ttypgrpid = NO_PID;
+ session_unlock(sessp);
+
+ if ((ttyvp != NULLVP) && (vnode_getwithvid(ttyvp, ttyvid) == 0)) {
+ context.vc_thread = proc_thread(p); /* XXX */
+ context.vc_ucred = kauth_cred_proc_ref(p);
+ VNOP_REVOKE(ttyvp, REVOKEALL, &context);
+ vnode_put(ttyvp);
+ kauth_cred_unref(&context.vc_ucred);
+ }
+ } else {
+ session_lock(sessp);
+ ttyvp = sessp->s_ttyvp;
+ sessp->s_ttyvp = NULL;
+ sessp->s_ttyvid = 0;
+ sessp->s_ttyp = NULL;
+ sessp->s_ttypgrpid = NO_PID;
+ session_unlock(sessp);
}
- ttyvp = sp->s_ttyvp;
- sp->s_ttyvp = NULL;
- if (ttyvp) {
+ if (ttyvp)
vnode_rele(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)
*/
}
- sp->s_leader = NULL;
+
+ (void) thread_funnel_set(kernel_flock, fstate);
+ 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);
- }
-#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) {
- /*
- * 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_list_lock();
+ /* wait till parentrefs are dropped and grant no more */
+ proc_childdrainstart(p);
+ while ((q = p->p_children.lh_first) != NULL) {
+ q->p_listflag |= P_LIST_DEADPARENT;
+ 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, 1, 0);
+ } else {
+ proc_reparentlocked(q, initproc, 0, 1);
+ /*
+ * Traced processes are killed
+ * since their existence means someone is messing up.
+ */
+ if (q->p_lflag & P_LTRACED) {
+ proc_list_unlock();
+ proc_lock(q);
+ q->p_lflag &= ~P_LTRACED;
+ if (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_t)q->sigwait_thread);
+ clear_wait(q->sigwait_thread, THREAD_INTERRUPTED);
+ threadsignal((thread_t)q->sigwait_thread, SIGKILL, 0);
+ } else
+ proc_unlock(q);
+ psignal(q, SIGKILL);
+ proc_list_lock();
}
- 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.
*/
+ /* No need for locking here as no one than this thread can access this */
if (p->p_ru != NULL) {
*p->p_ru = p->p_stats->p_ru;
timerclear(&p->p_ru->ru_stime);
if (task) {
- task_basic_info_data_t tinfo;
+ task_basic_info_32_data_t tinfo;
task_thread_times_info_data_t ttimesinfo;
- int task_info_stuff, task_ttimes_stuff;
+ task_events_info_data_t teventsinfo;
+ mach_msg_type_number_t task_info_stuff, task_ttimes_stuff;
+ mach_msg_type_number_t task_events_stuff;
struct timeval ut,st;
- task_info_stuff = TASK_BASIC_INFO_COUNT;
- task_info(task, TASK_BASIC_INFO,
+ task_info_stuff = TASK_BASIC_INFO_32_COUNT;
+ task_info(task, TASK_BASIC2_INFO_32,
(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;
+ p->p_ru->ru_maxrss = tinfo.resident_size;
+
task_ttimes_stuff = TASK_THREAD_TIMES_INFO_COUNT;
task_info(task, TASK_THREAD_TIMES_INFO,
(task_info_t)&ttimesinfo, &task_ttimes_stuff);
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);
+
+ task_events_stuff = TASK_EVENTS_INFO_COUNT;
+ task_info(task, TASK_EVENTS_INFO,
+ (task_info_t)&teventsinfo, &task_events_stuff);
+
+ p->p_ru->ru_minflt = (teventsinfo.faults -
+ teventsinfo.pageins);
+ p->p_ru->ru_majflt = teventsinfo.pageins;
+ p->p_ru->ru_nivcsw = (teventsinfo.csw -
+ p->p_ru->ru_nvcsw);
+ if (p->p_ru->ru_nivcsw < 0)
+ p->p_ru->ru_nivcsw = 0;
}
ruadd(p->p_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;
+
/*
* 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);
+ proc_knote(p, NOTE_EXIT);
+ /* 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 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);
+ if (p->p_ru != NULL) {
+ proc_lock(pp);
+ ruadd(&pp->p_stats->p_cru, p->p_ru);
+ proc_unlock(pp);
+ }
+#endif /* !3839178 */
- proc_reparent(p, initproc);
- /* If there are no more children wakeup parent */
- if (LIST_EMPTY(&opp->p_children))
- wakeup((caddr_t)opp);
- }
- /* 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;
+ /* kernel can reap this one, no need to move it to launchd */
+ proc_list_lock();
+ p->p_listflag |= P_LIST_DEADPARENT;
+ proc_list_unlock();
}
- /* mark as a zombie */
- p->p_stat = SZOMB;
+ 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 = p->p_ucred->cr_ruid;
+ 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
+ */
+ p->p_stat = SZOMB;
+ /*
+ * The current process can be reaped so, no one
+ * can depend on this
+ */
- psignal(pp, SIGCHLD);
+ 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();
+ p->p_stat = SZOMB;
+ /* 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_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, 1, 1);
+ /* list lock dropped by reap_child_locked */
+ }
- /* 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 locked, int droplock)
{
- struct proc *trace_parent; /* Traced parent process, if tracing */
- struct vnode *tvp; /* Traced vnode pointer, if used */
+ proc_t trace_parent; /* Traced parent process, if tracing */
/*
* If we got the child via a ptrace 'attach',
* we need to give it back to the old parent.
*/
- if (child->p_oppid && (trace_parent = pfind(child->p_oppid))) {
+ if (locked == 1)
+ proc_list_unlock();
+ if (child->p_oppid && (trace_parent = proc_find(child->p_oppid))) {
+ proc_lock(child);
child->p_oppid = 0;
- proc_reparent(child, trace_parent);
+ proc_unlock(child);
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 = child->p_ucred->cr_ruid;
+ proc_unlock(trace_parent);
}
+ proc_reparentlocked(child, trace_parent, 1, 0);
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);
}
+
+ proc_knote(child, NOTE_REAP);
+
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);
+ proc_unlock(parent);
FREE_ZONE(child->p_ru, sizeof *child->p_ru, M_ZOMBIE);
child->p_ru = NULL;
} else {
/*
* 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);
- /*
- * 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--;
+
+ proc_list_unlock();
+
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);
+ workqueue_destroy_lock(child);
+
FREE_ZONE(child, sizeof *child, M_PROC);
- nprocs--;
+ if ((locked == 1) && (droplock == 0))
+ proc_list_lock();
+
return (1);
}
void *vt;
thread_t thread;
int *retval;
- struct proc *p;
+ proc_t p;
if (result)
return(result);
thread = current_thread();
vt = get_bsduthreadarg(thread);
retval = get_bsduthreadrval(thread);
- return(wait4((struct proc *)p, (struct wait4_args *)vt, retval));
+ return(wait4(p, (struct wait4_args *)vt, retval));
}
int
-wait4(struct proc *q, struct wait4_args *uap, register_t *retval)
+wait4(proc_t q, struct wait4_args *uap, register_t *retval)
{
- register int nfound;
- register struct proc *p;
+ __pthread_testcancel(1);
+ return(wait4_nocancel(q, (struct wait4_nocancel_args *)uap, retval));
+}
+
+int
+wait4_nocancel(proc_t q, struct wait4_nocancel_args *uap, register_t *retval)
+{
+ int nfound;
+ proc_t p;
int status, error;
if (uap->pid == 0)
- uap->pid = -q->p_pgid;
+ uap->pid = -q->p_pgrpid;
loop:
+ proc_list_lock();
+loop1:
nfound = 0;
for (p = q->p_children.lh_first; p != 0; p = p->p_sibling.le_next) {
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) {
+ 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) {
}
}
/* 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;
+ if (!reap_child_locked(q, p, 0, 0, 0)) {
+ proc_list_lock();
+ p->p_listflag &= ~P_LIST_WAITING;
wakeup(&p->p_stat);
+ proc_list_unlock();
}
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), (UInt32 *)&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)))
+ 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);
}
void *vt;
thread_t thread;
int *retval;
- struct proc *p;
if (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));
+ return(waitid(current_proc(), (struct waitid_args *)vt, retval));
}
/*
* !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, register_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 register_t *retval)
{
user_siginfo_t collect64; /* siginfo data to return to caller */
- register int nfound;
- register struct proc *p;
+ int nfound;
+ proc_t p;
int error;
+ /*
+ * Forced validation of options for T.waitpid 21; should be a TSD!
+ * This will pass the test, but note that we have more bits than the
+ * standard specifies that we will allow in, in this case. The test
+ * passes because they light all the bits, not just the ones we allow,
+ * and so the following check returns EINVAL like the test wants.
+ */
+ if (((uap->options & (WNOHANG|WNOWAIT|WCONTINUED|WUNTRACED|WSTOPPED|WEXITED)) != uap->options) ||
+ (uap->options == 0))
+ return (EINVAL); /* bits set that aren't recognized */
+
+ /*
+ * Overly critical options checking, per POSIX
+ */
+ 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) {
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++;
if (!(uap->options & WEXITED))
break;
+ /* drop the lock and the thread is going to return */
+ proc_list_unlock();
+
/* Collect "siginfo" information for caller */
- collect64.si_signo = 0;
+ collect64.si_signo = SIGCHLD;
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_status = WEXITSTATUS(p->p_xstat);
collect64.si_band = 0;
if (IS_64BIT_PROCESS(p)) {
sizeof(collect));
}
/* information unavailable? */
- if (error) {
- p->p_lflag &= ~P_LWAITING;
- wakeup(&p->p_stat);
- return (error);
- }
+ if (error)
+ 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;
+ if (!reap_child_locked(q, p, 0, 0, 0)) {
+ proc_list_lock();
+ p->p_listflag &= ~P_LIST_WAITING;
wakeup(&p->p_stat);
+ proc_list_unlock();
}
+ } else {
+ proc_list_lock();
+ p->p_listflag &= ~P_LIST_WAITING;
+ proc_list_unlock();
}
return (0);
* 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;
- /*
- * 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;
+ /* drop the lock and the thread is going to return */
+ proc_list_unlock();
/* Collect "siginfo" information for caller */
- collect64.si_signo = 0;
+ collect64.si_signo = SIGCHLD;
collect64.si_code = 0;
collect64.si_errno = 0;
collect64.si_pid = 0;
collect64.si_uid = 0;
collect64.si_addr = 0;
+ proc_lock(p);
collect64.si_status = p->p_xstat;
+ proc_unlock(p);
collect64.si_band = 0;
if (IS_64BIT_PROCESS(p)) {
sizeof(collect));
}
/* information unavailable? */
- if (error) {
- p->p_lflag &= ~P_LWAITING;
- wakeup(&p->p_stat);
- return (error);
- }
+ if (error)
+ 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);
}
- p->p_lflag &= ~P_LWAITING;
- wakeup(&p->p_stat);
- return (0);
+ error = 0;
+ goto out;
default: /* All others */
/* ...meaning Continued */
if ((p->p_flag & P_CONTINUED) == 0)
break;
+ /* drop the lock and the thread is going to return */
+ proc_list_unlock();
+
/* Collect "siginfo" information for caller */
- collect64.si_signo = 0;
- collect64.si_code = 0;
+ proc_lock(p);
+ collect64.si_signo = SIGCHLD;
+ collect64.si_code = CLD_CONTINUED;
collect64.si_errno = 0;
- collect64.si_pid = 0;
+ collect64.si_pid = p->p_contproc;
collect64.si_uid = 0;
collect64.si_addr = 0;
collect64.si_status = p->p_xstat;
collect64.si_band = 0;
+ proc_unlock(p);
if (IS_64BIT_PROCESS(p)) {
error = copyout((caddr_t)&collect64,
sizeof(collect));
}
/* information unavailable? */
- if (error) {
- p->p_lflag &= ~P_LWAITING;
- wakeup(&p->p_stat);
- return (error);
- }
+ if (error)
+ goto out;
/* Prevent other process for waiting for this event? */
if (!(uap->options & WNOWAIT)) {
- p->p_flag &= ~P_CONTINUED;
+ OSBitAndAtomic(~((uint32_t)P_CONTINUED), (UInt32 *)&p->p_flag);
}
- p->p_lflag &= ~P_LWAITING;
- wakeup(&p->p_stat);
- return (0);
-
- break;
+ error = 0;
+ goto out;
}
-
-
+ /* LIST LOCK IS HELD HERE */
/* 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);
}
+ /* list lock is always held */
/* 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();
return (0);
}
- if ((error = tsleep0((caddr_t)q, PWAIT | PCATCH, "waitid", 0, waitidcontinue)))
+ if ((error = msleep0((caddr_t)q, proc_list_mlock, PWAIT | PCATCH | PDROP, "waitid", 0, waitidcontinue)))
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 %x does not have a parent\n", (unsigned int)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 (initproc == parent && child->p_stat == SZOMB)
+ if ((cansignal != 0) && (initproc == parent) && (child->p_stat == SZOMB))
psignal(initproc, SIGCHLD);
+ if (locked == 1)
+ proc_list_lock();
}
/*
kern_return_t
init_process(__unused struct init_process_args *args)
{
- register struct proc *p = current_proc();
+ proc_t p = current_proc();
AUDIT_MACH_SYSCALL_ENTER(AUE_INITPROCESS);
if (suser(kauth_cred_get(), &p->p_acflag)) {
return(KERN_NO_ACCESS);
}
- if (p->p_pid != 1 && p->p_pgid != p->p_pid)
+ if (p->p_pid != 1 && p->p_pgrpid != p->p_pid)
enterpgrp(p, p->p_pid, 0);
- p->p_flag |= P_SYSTEM;
+ OSBitOrAtomic(P_SYSTEM, (UInt32 *)&p->p_flag);
/*
* Take us out of the sibling chain, and
* out of our parent's child chain.
*/
+ proc_list_lock();
LIST_REMOVE(p, p_sibling);
p->p_sibling.le_prev = NULL;
p->p_sibling.le_next = NULL;
p->p_pptr = kernproc;
+ p->p_ppid = 0;
+ proc_list_unlock();
+
AUDIT_MACH_SYSCALL_EXIT(KERN_SUCCESS);
return(KERN_SUCCESS);
*/
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();
+
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;
+ boolean_t fstate;
/* 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);
+
+ proc_refdrain(p);
+
/*
* Close open files and release open-file table.
* This may block!
*/
fdfree(p);
- if (SESS_LEADER(p)) {
- register struct session *sp = p->p_session;
+ sessp = proc_session(p);
+ if (SESS_LEADER(p, sessp)) {
+
+ /* Protected by funnel for tty accesses */
+ fstate = thread_funnel_set(kernel_flock, TRUE);
- if (sp->s_ttyvp) {
+ if (sessp->s_ttyvp != NULLVP) {
struct vnode *ttyvp;
+ int ttyvid;
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);
+ tp = sessp->s_ttyp;
+
+ if ((tp != TTY_NULL) && (tp->t_session == sessp)) {
+ tty_pgsignal(tp, SIGHUP, 1);
+ (void) ttywait(tp);
/*
* The tty could have been revoked
* if we blocked.
*/
- context.vc_proc = p;
- context.vc_ucred = p->p_ucred;
- if (sp->s_ttyvp)
- VNOP_REVOKE(sp->s_ttyvp, REVOKEALL, &context);
+
+ session_lock(sessp);
+ ttyvp = sessp->s_ttyvp;
+ ttyvid = sessp->s_ttyvid;
+ sessp->s_ttyvp = NULL;
+ sessp->s_ttyvid = 0;
+ sessp->s_ttyp = NULL;
+ sessp->s_ttypgrpid = NO_PID;
+ session_unlock(sessp);
+
+ if ((ttyvp != NULLVP) && (vnode_getwithvid(ttyvp, ttyvid) == 0)) {
+ context.vc_thread = proc_thread(p); /* XXX */
+ context.vc_ucred = kauth_cred_proc_ref(p);
+ VNOP_REVOKE(ttyvp, REVOKEALL, &context);
+ vnode_put(ttyvp);
+ kauth_cred_unref(&context.vc_ucred);
+ }
+ } else {
+ session_lock(sessp);
+ ttyvp = sessp->s_ttyvp;
+ sessp->s_ttyvp = NULL;
+ sessp->s_ttyvid = 0;
+ sessp->s_ttyp = NULL;
+ sessp->s_ttypgrpid = NO_PID;
+ session_unlock(sessp);
}
- ttyvp = sp->s_ttyvp;
- sp->s_ttyvp = NULL;
- if (ttyvp) {
+ if (ttyvp)
vnode_rele(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)
*/
}
- sp->s_leader = NULL;
+ (void) thread_funnel_set(kernel_flock, fstate);
+
+ session_lock(sessp);
+ sessp->s_leader = NULL;
+ session_unlock(sessp);
}
+ session_rele(sessp);
- fixjobc(p, p->p_pgrp, 0);
- p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
+ pg = proc_pgrp(p);
+ fixjobc(p, pg, 0);
+ pg_rele(pg);
-#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
+ p->p_rlimit[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
- 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_list_lock();
+ proc_childdrainstart(p);
+ while ((q = p->p_children.lh_first) != NULL) {
+ q->p_listflag |= P_LIST_DEADPARENT;
+ 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, 1, 0);
+ } else {
+ proc_reparentlocked(q, initproc, 0, 1);
+ /*
+ * Traced processes are killed
+ * since their existence means someone is messing up.
+ */
+ if (q->p_lflag & P_LTRACED) {
+ proc_list_unlock();
+ proc_lock(q);
+ q->p_lflag &= ~P_LTRACED;
+ if (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_t)q->sigwait_thread);
+ clear_wait(q->sigwait_thread, THREAD_INTERRUPTED);
+ threadsignal((thread_t)q->sigwait_thread, SIGKILL, 0);
+ } else
+ proc_unlock(q);
+
+ psignal(q, SIGKILL);
+ proc_list_lock();
}
- 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.
*/
+ /* No need for locking here as no one than this thread can access this */
if (p->p_ru != NULL) {
*p->p_ru = p->p_stats->p_ru;
timerclear(&p->p_ru->ru_utime);
/*
* 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 = p->p_ucred->cr_ruid;
+ 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 */
- wakeup((caddr_t)p->p_pptr);
+ /* and now wakeup the parent */
+ proc_list_lock();
+ wakeup((caddr_t)pp);
+ proc_list_unlock();
+ } else {
+ proc_list_lock();
+ p->p_stat = SZOMB;
+ /* 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_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, 1, 1);
+ /* list lock dropped by reap_child_locked */
+ }
+ proc_rele(pp);
}
projects / apple / xnu.git / blobdiff