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- Hold both an exclusive proctree lock and the proc lock when reparenting

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a traced process during exit.
- Lock the parent process while sending it SIGCHLD.
This commit is contained in:
jhb 2001-03-07 02:17:43 +00:00
parent 4f238e0d87
commit 6b3e8d1743
1 changed files with 11 additions and 10 deletions
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21
sys/compat/svr4/svr4_misc.c
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@ -1252,26 +1252,27 @@ svr4_sys_waitsys(p, uap)
* parent a SIGCHLD. The rest of the cleanup will be
* done when the old parent waits on the child.
*/
PROCTREE_LOCK(PT_EXCLUSIVE);
PROC_LOCK(q);
if (q->p_flag & P_TRACED) {
PROC_UNLOCK(q);
PROCTREE_LOCK(PT_EXCLUSIVE);
if (q->p_oppid != q->p_pptr->p_pid) {
PROC_UNLOCK(q);
t = pfind(q->p_oppid);
proc_reparent(q, t ? t : initproc);
PROCTREE_LOCK(PT_RELEASE);
PROC_LOCK(q);
q->p_oppid = 0;
proc_reparent(q, t ? t : initproc);
q->p_oppid = 0;
q->p_flag &= ~(P_TRACED | P_WAITED);
PROC_UNLOCK(q);
PROCTREE_LOCK(PT_SHARED);
wakeup((caddr_t)q->p_pptr);
PROC_LOCK(t);
psignal(t, SIGCHLD);
PROC_UNLOCK(t);
PROCTREE_LOCK(PT_RELEASE);
wakeup(t);
return 0;
}
PROCTREE_LOCK(PT_RELEASE);
} else
PROC_UNLOCK(q);
}
PROC_UNLOCK(q);
PROCTREE_LOCK(PT_RELEASE);
q->p_xstat = 0;
ruadd(&p->p_stats->p_cru, q->p_ru);
FREE(q->p_ru, M_ZOMBIE);