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/* Copyright (C) 1991-2017 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <unistd.h>
#include <hurd.h>
#include <hurd/port.h>
/* Get the process group ID of process PID. */
int
__getpgid (pid_t pid)
{
error_t err;
pid_t pgrp;
if (pid == 0)
{
/* Assume atomic word fetch and store, so don't lock _hurd_pid_lock. */
pgrp = _hurd_pgrp;
err = 0;
}
else
err = __USEPORT (PROC, __proc_getpgrp (port, pid, &pgrp));
return err ? __hurd_fail (err) : pgrp;
}
libc_hidden_def (__getpgid)
weak_alias (__getpgid, getpgid)
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