bsd/kern/kern_exit.c

156 static int reap_child_locked(proc_t parent, proc_t child, int deadparent, int reparentedtoinit, int locked, int droplock);
243  * status and rusage for wait().  Check for child processes and orphan them.
659 				panic("parent child linkage broken");
683 				 * Take a reference on the child process to
732 	 * Save exit status and final rusage info, adding in child rusage
820 		 * Add child resource usage to parent before giving
927  *		proc_t child		Process to reap
934 reap_child_locked(proc_t parent, proc_t child, int deadparent, int reparentedtoinit, int locked, int droplock)
942 	 * If we got the child via a ptrace 'attach',
951 	if (child->p_oppid) {
955 		proc_lock(child);
956 		oppid = child->p_oppid;
957 		child->p_oppid = 0;
958 		knote_hint = NOTE_EXIT | (child->p_xstat & 0xffff);
959 		proc_unlock(child);
967 				 * here as child is dead and is not reaped or
971 				trace_parent->si_pid = child->p_pid;
972 				trace_parent->si_status = child->p_xstat;
974 				trace_parent->si_uid = kauth_cred_getruid(child->p_ucred);
977 			proc_reparentlocked(child, trace_parent, 1, 0);
980 			proc_knote(child, knote_hint);
985 			child->p_listflag &= ~P_LIST_WAITING;
986 			wakeup(&child->p_stat);
995 		 * If we can't reparent (e.g. the original parent exited while child was being debugged, or
998 		 * the NOTE_EXIT would not have been broadcast during initial child termination.
1000 		proc_knote(child, knote_hint);
1007 	proc_knote(child, NOTE_REAP);
1008 	proc_knote_drain(child);
1010 	child->p_xstat = 0;
1011 	if (child->p_ru) {
1023 			ruadd(&parent->p_stats->p_cru, child->p_ru);
1025 		FREE_ZONE(child->p_ru, sizeof *child->p_ru, M_ZOMBIE);
1026 		child->p_ru = NULL;
1028 		printf("Warning : lost p_ru for %s\n", child->p_comm);
1031 	AUDIT_SESSION_PROCEXIT(child);
1039 	(void)chgproccnt(kauth_cred_getruid(child->p_ucred), -1);
1043 	leavelctx(child);
1050 	if (IS_VALID_CRED(child->p_ucred)) {
1051 		kauth_cred_unref(&child->p_ucred);
1060 	leavepgrp(child);
1063 	LIST_REMOVE(child, p_list);	/* off zombproc */
1065 	LIST_REMOVE(child, p_sibling);
1069 	child->p_listflag &= ~P_LIST_WAITING;
1070 	wakeup(&child->p_stat);
1073 	LIST_REMOVE(child, p_hash);
1074 	child->p_listflag &= ~P_LIST_INHASH;
1075 	proc_checkdeadrefs(child);
1081 	lck_mtx_destroy(&child->p_mlock, proc_mlock_grp);
1082 	lck_mtx_destroy(&child->p_fdmlock, proc_fdmlock_grp);
1084 	lck_mtx_destroy(&child->p_dtrace_sprlock, proc_lck_grp);
1086 	lck_spin_destroy(&child->p_slock, proc_slock_grp);
1088 	lck_mtx_destroy(&child->p_mlock, proc_lck_grp);
1089 	lck_mtx_destroy(&child->p_fdmlock, proc_lck_grp);
1091 	lck_mtx_destroy(&child->p_dtrace_sprlock, proc_lck_grp);
1093 	lck_spin_destroy(&child->p_slock, proc_lck_grp);
1095 	workqueue_destroy_lock(child);
1097 	FREE_ZONE(child, sizeof *child, M_PROC);
1212 			 * of a child process is available and there are no other
1330  * Description:	Suspend the calling thread until one child of the process
1364 	case P_PID:	/* child with process ID equal to... */
1365 	case P_PGID:	/* child with process group ID equal to... */
1369 	case P_ALL:	/* any child */
1380 		case P_PID:	/* child with process ID equal to... */
1384 		case P_PGID:	/* child with process group ID equal to... */
1388 		case P_ALL:	/* any child */
1510 		/* Not a process we are interested in; go on to next child */
1517 	/* No child processes that could possibly satisfy the request? */
1556  * make process 'parent' the new parent of process 'child'.
1559 proc_reparentlocked(proc_t child, proc_t parent, int cansignal, int locked)
1563 	if (child->p_pptr == parent)
1569 	oldparent = child->p_pptr;
1572 		panic("proc_reparent: process %p does not have a parent\n", child);
1575 	LIST_REMOVE(child, p_sibling);
1585 	LIST_INSERT_HEAD(&parent->p_children, child, p_sibling);
1587 	child->p_pptr = parent;
1588 	child->p_ppid = parent->p_pid;
1592 	if ((cansignal != 0) && (initproc == parent) && (child->p_stat == SZOMB))
1601  * status and rusage for wait().  Check for child processes and orphan them.
1642 		 * parent of a vfork child has already called exit() and the
1797 				panic("parent child linkage broken");
1860 	 * Save exit status and final rusage info, adding in child rusage