On Tue, Jan 08, 2019 at 10:53:06AM -0700, Tycho Andersen wrote: > On Wed, Jan 02, 2019 at 05:16:54PM +0100, Christian Brauner wrote: > > + /* > > + * Stop the child so we can inspect whether we have > > + * recycled pid PID_RECYCLE. > > + */ > > + close(pipe_fds[0]); > > + ret = kill(recycled_pid, SIGSTOP); > > + close(pipe_fds[1]); > > + if (ret) { > > + (void)wait_for_pid(recycled_pid); > > + _exit(PIDFD_ERROR); > > + } > > Sorry for being late to the party, but I wonder if this whole thing > couldn't be simplified with /proc/sys/kenrel/ns_last_pid? no, bc it's not namespaced :)