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688903eb | 1 | /* Copyright (C) 1993-2018 Free Software Foundation, Inc. |
ebbad4cc | 2 | This file is part of the GNU C Library. |
28f540f4 | 3 | |
ebbad4cc | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
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. | |
28f540f4 | 8 | |
ebbad4cc UD |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
28f540f4 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
28f540f4 | 17 | |
28f540f4 RM |
18 | #include <errno.h> |
19 | #include <unistd.h> | |
20 | #include <hurd.h> | |
21 | #include <hurd/port.h> | |
50b076f4 | 22 | #include <hurd/fd.h> |
868df0f9 | 23 | #include <hurd/ioctl.h> |
28f540f4 | 24 | |
28f540f4 RM |
25 | /* Create a new session with the calling process as its leader. |
26 | The process group IDs of the session and the calling process | |
27 | are set to the process ID of the calling process, which is returned. */ | |
50b076f4 RM |
28 | pid_t |
29 | __setsid (void) | |
28f540f4 RM |
30 | { |
31 | error_t err; | |
32 | unsigned int stamp; | |
33 | ||
50b076f4 RM |
34 | HURD_CRITICAL_BEGIN; |
35 | __mutex_lock (&_hurd_dtable_lock); | |
36 | ||
28f540f4 RM |
37 | stamp = _hurd_pids_changed_stamp; /* Atomic fetch. */ |
38 | ||
39 | /* Tell the proc server we want to start a new session. */ | |
50b076f4 | 40 | err = __USEPORT (PROC, __proc_setsid (port)); |
72e1a750 RM |
41 | if (err) |
42 | __mutex_unlock (&_hurd_dtable_lock); | |
43 | else | |
44 | { | |
45 | /* Punt our current ctty, and update the dtable accordingly. We hold | |
46 | the dtable lock from before the proc_setsid call through clearing | |
47 | the cttyid port and processing the dtable, so that we can be sure | |
48 | that it's all done by the time the signal thread processes the | |
49 | pgrp change notification. */ | |
50 | _hurd_locked_install_cttyid (MACH_PORT_NULL); | |
28f540f4 | 51 | |
72e1a750 RM |
52 | /* Synchronize with the signal thread to make sure we have received |
53 | and processed proc_newids before returning to the user. | |
54 | This is necessary to ensure that _hurd_pgrp (and thus the value | |
55 | returned by `getpgrp ()' in other threads) has been updated before | |
56 | we return. */ | |
57 | while (_hurd_pids_changed_stamp == stamp) | |
58 | { | |
28f540f4 | 59 | #ifdef noteven |
72e1a750 RM |
60 | /* XXX we have no need for a mutex, but cthreads demands one. */ |
61 | __condition_wait (&_hurd_pids_changed_sync, NULL); | |
28f540f4 | 62 | #else |
72e1a750 | 63 | __swtch_pri (0); |
28f540f4 | 64 | #endif |
72e1a750 RM |
65 | } |
66 | } | |
50b076f4 RM |
67 | |
68 | HURD_CRITICAL_END; | |
28f540f4 | 69 | |
50b076f4 | 70 | return err ? __hurd_fail (err) : _hurd_pgrp; |
28f540f4 RM |
71 | } |
72 | ||
73 | weak_alias (__setsid, setsid) |