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| -rw-r--r-- | _posts/2022-11-07-ptrace-waitpid.md | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/_posts/2022-11-07-ptrace-waitpid.md b/_posts/2022-11-07-ptrace-waitpid.md index 3c331c7..b5f34fa 100644 --- a/_posts/2022-11-07-ptrace-waitpid.md +++ b/_posts/2022-11-07-ptrace-waitpid.md @@ -36,6 +36,8 @@ status changes from other thread's children. So if you have two tracer threads A and B, and each of them is attached to a tracee, then thread A might consume thread B's tracee status change by calling `waitpid(-1)`. +Therefore, thread A would have thread B's tracee status. +A typical application could be completely unprepared for this scenario. To avoid that, use the `__WNOTHREAD` flag. That way, thread A will only consume status changes from its own children only. |