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Eat pending SIGSTOP _before_ PTRACE_DETACH in detach()

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* strace.c (detach): If TCB_IGNORE_ONE_SIGSTOP is set,
di not PTRACE_DETACH - wait for SIGSTOP first.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
This commit is contained in:
Denys Vlasenko 2013-06-21 15:50:41 +02:00
parent fdfa47af7e
commit a2de9dacec
1 changed files with 3 additions and 0 deletions
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3
strace.c
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@ -758,6 +758,8 @@ detach(struct tcb *tcp)
* would be left stopped (process state T).
*/
sigstop_expected = (tcp->flags & TCB_IGNORE_ONE_SIGSTOP);
if (sigstop_expected)
goto wait_loop;
error = ptrace(PTRACE_DETACH, tcp->pid, 0, 0);
if (error == 0) {
/* On a clear day, you can see forever. */
@ -802,6 +804,7 @@ detach(struct tcb *tcp)
}
if (sigstop_expected || interrupt_done) {
wait_loop:
for (;;) {
int sig;
if (waitpid(tcp->pid, &status, __WALL) < 0) {