On 05/17, Aleksa Sarai wrote:
On 2019-05-16, Oleg Nesterov <oleg@xxxxxxxxxx> wrote:
On 05/16, Christian Brauner wrote:
With the introduction of pidfds through CLONE_PIDFD it is possible to
created pidfds at process creation time.
Now I am wondering why do we need CLONE_PIDFD, you can just do
pid = fork();
pidfd_open(pid);
While the race window would be exceptionally short, there is the
possibility that the child will die
Yes,
and their pid will be recycled
before you do pidfd_open().
No.
Unless the caller's sub-thread does wait() before pidfd_open(), of course.
Or unless you do signal(SIGCHILD, SIG_IGN).
Oleg.
