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Date:      Wed, 18 Nov 2020 01:57:57 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 251227] setpgid sometimes returns ESRCH instead of EACCES
Message-ID:  <bug-251227-227-jN450LDT61@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-251227-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-251227-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D251227

--- Comment #1 from Conrad Meyer <cem@freebsd.org> ---
> the unreaped child process remains present until the parent terminates (i=
.e. the referenced target pid does exist)

I don't know if it's true that we consider zombie processes "to exist" in t=
he
sense of this manual page.  In implementation, we don't =E2=80=94 setpgid(2=
) uses
pfind(9), which ignores zombie processes, instead of pfind_any(9), which can
locate zombie processes.  This is relatively common: e.g., there are 30
invocations of pfind() in the core kernel, but only 5 of pfind_any().

I'm not sure this behavior difference with Linux matters.  Can you explain =
more
about why you think this is a bug?

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