Re: [PATCH v7 2/2] selftests: add tests for pidfd_send_signal()

[Tycho Andersen]

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?

Tycho