1 | /* Copyright (C) 1991-2024 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
4 | The GNU C Library is free software; you can redistribute it and/or |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either |
7 | version 2.1 of the License, or (at your option) any later version. |
8 | |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
12 | Lesser General Public License for more details. |
13 | |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, see |
16 | <https://www.gnu.org/licenses/>. */ |
17 | |
18 | #include <errno.h> |
19 | #include <unistd.h> |
20 | #include <hurd.h> |
21 | #include <hurd/port.h> |
22 | |
23 | /* Get the process group ID of process PID. */ |
24 | int |
25 | __getpgid (pid_t pid) |
26 | { |
27 | error_t err; |
28 | pid_t pgrp; |
29 | |
30 | if (pid == 0) |
31 | { |
32 | /* Assume atomic word fetch and store, so don't lock _hurd_pid_lock. */ |
33 | pgrp = _hurd_pgrp; |
34 | err = 0; |
35 | } |
36 | else |
37 | err = __USEPORT (PROC, __proc_getpgrp (port, pid, &pgrp)); |
38 | |
39 | return err ? __hurd_fail (err) : pgrp; |
40 | } |
41 | libc_hidden_def (__getpgid) |
42 | weak_alias (__getpgid, getpgid) |
43 | |