On 2019-05-16, Oleg Nesterov <o...@redhat.com> wrote: > On 05/17, Aleksa Sarai wrote: > > On 2019-05-16, Oleg Nesterov <o...@redhat.com> 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).
What about CLONE_PARENT? -- Aleksa Sarai Senior Software Engineer (Containers) SUSE Linux GmbH <https://www.cyphar.com/>
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