1 | /* Copyright (C) 1993-2022 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 | #include <lowlevellock.h> |
23 | |
24 | /* Set the process group ID of the process matching PID to PGID. |
25 | If PID is zero, the current process's process group ID is set. |
26 | If PGID is zero, the process ID of the process is used. */ |
27 | int |
28 | __setpgid (pid_t pid, pid_t pgid) |
29 | { |
30 | error_t err; |
31 | unsigned int stamp; |
32 | |
33 | stamp = _hurd_pids_changed_stamp; /* Atomic fetch. */ |
34 | |
35 | if (err = __USEPORT (PROC, __proc_setpgrp (port, pid, pgid))) |
36 | return __hurd_fail (err); |
37 | |
38 | if (pid == 0 || pid == _hurd_pid) |
39 | /* Synchronize with the signal thread to make sure we have |
40 | received and processed proc_newids before returning to the user. */ |
41 | while (_hurd_pids_changed_stamp == stamp) |
42 | lll_wait (_hurd_pids_changed_stamp, stamp, 0); |
43 | |
44 | return 0; |
45 | |
46 | } |
47 | libc_hidden_def (__setpgid) |
48 | weak_alias (__setpgid, setpgid) |
49 | |