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Make sure pending SIGCHLD is removed from previous parent when process

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is attached or detached.
This commit is contained in:
David Xu 2005-11-08 23:28:12 +00:00
parent ff1625c61d
commit c20cedbfc9
1 changed files with 10 additions and 1 deletions
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11
sys/kern/sys_process.c
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@ -673,8 +673,12 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
/* security check done above */
p->p_flag |= P_TRACED;
p->p_oppid = p->p_pptr->p_pid;
if (p->p_pptr != td->td_proc)
if (p->p_pptr != td->td_proc) {
PROC_LOCK(p->p_pptr);
sigqueue_take(p->p_ksi);
PROC_UNLOCK(p->p_pptr);
proc_reparent(p, td->td_proc);
}
data = SIGSTOP;
goto sendsig; /* in PT_CONTINUE below */
@ -765,6 +769,10 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
if (p->p_oppid != p->p_pptr->p_pid) {
struct proc *pp;
PROC_LOCK(p->p_pptr);
sigqueue_take(p->p_ksi);
PROC_UNLOCK(p->p_pptr);
PROC_UNLOCK(p);
pp = pfind(p->p_oppid);
if (pp == NULL)
@ -780,6 +788,7 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
p->p_oppid = 0;
/* should we send SIGCHLD? */
/* childproc_continued(p); */
}
sendsig: