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ptrace: Add comment about early interrupt

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Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Emelyanov 2013-12-20 16:42:24 +04:00
parent 800c4d09bb
commit 805e25effe
1 changed files with 9 additions and 1 deletions
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10
ptrace.c
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@ -53,7 +53,15 @@ int seize_task(pid_t pid, pid_t ppid, pid_t *pgid, pid_t *sid)
ret = ptrace(PTRACE_SEIZE, pid, NULL, 0);
ptrace_errno = errno;
if (ret == 0) {
/* Stop task before determing its state */
/*
* If we SEIZE-d the task stop it before going
* and reading its stat from proc. Otherwise task
* may die _while_ we're doing it and we'll have
* inconsistent seize/state pair.
*
* If task dies after we seize it but before we
* do this interrupt, we'll notice it via proc.
*/
ret = ptrace(PTRACE_INTERRUPT, pid, NULL, NULL);
if (ret < 0) {
pr_perror("SEIZE %d: can't interrupt task", pid);