[Bug 251227] setpgid sometimes returns ESRCH instead of EACCES

[bugzilla-noreply at freebsd.org]

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

--- Comment #1 from Conrad Meyer <cem at 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 the
sense of this manual page.  In implementation, we don't — 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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