[Bug 251227] setpgid sometimes returns ESRCH instead of EACCES

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251227

--- Comment #4 from Conrad Meyer <cem at freebsd.org> ---
Thanks for the additional context, Mahmoud!

I guess I'm confused on why this is a problem.  Can fish just ignore ESRCH in
this context on FreeBSD?  Certainly half a dozen other shells run on FreeBSD
and implement some form of job control.  E.g., /bin/sh ignores the return value
of setpgid() entirely.

I don't see any requirement in POSIX around FreeBSD's ESRCH behavior (I looked
at it briefly yesterday, too).

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