Re: [PATCH v2 0/7] CLONE_FD: Task exit notification via file descriptor

[Florian Weimer <fweimer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

On 03/15/2015 08:59 AM, Josh Triplett wrote:
> This patch series introduces a new clone flag, CLONE_FD, which lets the caller
> receive child process exit notification via a file descriptor rather than
> SIGCHLD.  CLONE_FD makes it possible for libraries to safely launch and manage
> child processes on behalf of their caller, *without* taking over process-wide
> SIGCHLD handling (either via signal handler or signalfd).
> 
> Note that signalfd for SIGCHLD does not suffice here, because that still
> receives notification for all child processes, and interferes with process-wide
> signal handling.

It has been suggested (e.g.,
<https://sourceware.org/bugzilla/show_bug.cgi?id=15661#c3>) that you can
use the existing clone(2) without specifying SIGCHLD to create a new
process.  The resulting child process is not supposed to show up in
wait(2), only in a waitpid(2) (or similar) explicitly specifying the
PID.  Is this not the case?

-- 
Florian Weimer / Red Hat Product Security