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glibc  2.9
getpgid.c
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00001 /* Copyright (C) 1991, 92, 93, 94, 95, 97, 2002 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <unistd.h>
00021 #include <hurd.h>
00022 #include <hurd/port.h>
00023 
00024 /* Get the process group ID of process PID.  */
00025 int
00026 __getpgid (pid)
00027      pid_t pid;
00028 {
00029   error_t err;
00030   pid_t pgrp;
00031 
00032   if (pid == 0)
00033     {
00034       /* Assume atomic word fetch and store, so don't lock _hurd_pid_lock.  */
00035       pgrp = _hurd_pgrp;
00036       err = 0;
00037     }
00038   else
00039     err = __USEPORT (PROC, __proc_getpgrp (port, pid, &pgrp));
00040 
00041   return err ? __hurd_fail (err) : pgrp;
00042 }
00043 libc_hidden_def (__getpgid)
00044 weak_alias (__getpgid, getpgid)