/* Copyright (C) 1991-2018 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)