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dff8da6b | 1 | /* Copyright (C) 1993-2024 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 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://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> |
fb4cc8a0 | 24 | #include <lowlevellock.h> |
28f540f4 | 25 | |
28f540f4 RM |
26 | /* Create a new session with the calling process as its leader. |
27 | The process group IDs of the session and the calling process | |
28 | are set to the process ID of the calling process, which is returned. */ | |
50b076f4 RM |
29 | pid_t |
30 | __setsid (void) | |
28f540f4 RM |
31 | { |
32 | error_t err; | |
33 | unsigned int stamp; | |
34 | ||
c3b287be | 35 | retry: |
50b076f4 RM |
36 | HURD_CRITICAL_BEGIN; |
37 | __mutex_lock (&_hurd_dtable_lock); | |
38 | ||
28f540f4 RM |
39 | stamp = _hurd_pids_changed_stamp; /* Atomic fetch. */ |
40 | ||
41 | /* Tell the proc server we want to start a new session. */ | |
50b076f4 | 42 | err = __USEPORT (PROC, __proc_setsid (port)); |
72e1a750 RM |
43 | if (err) |
44 | __mutex_unlock (&_hurd_dtable_lock); | |
45 | else | |
46 | { | |
47 | /* Punt our current ctty, and update the dtable accordingly. We hold | |
48 | the dtable lock from before the proc_setsid call through clearing | |
49 | the cttyid port and processing the dtable, so that we can be sure | |
50 | that it's all done by the time the signal thread processes the | |
51 | pgrp change notification. */ | |
52 | _hurd_locked_install_cttyid (MACH_PORT_NULL); | |
28f540f4 | 53 | |
72e1a750 RM |
54 | /* Synchronize with the signal thread to make sure we have received |
55 | and processed proc_newids before returning to the user. | |
56 | This is necessary to ensure that _hurd_pgrp (and thus the value | |
57 | returned by `getpgrp ()' in other threads) has been updated before | |
58 | we return. */ | |
59 | while (_hurd_pids_changed_stamp == stamp) | |
bec41242 | 60 | lll_wait (_hurd_pids_changed_stamp, stamp, 0); |
72e1a750 | 61 | } |
50b076f4 RM |
62 | |
63 | HURD_CRITICAL_END; | |
c3b287be ST |
64 | if (err == EINTR) |
65 | /* Got a signal while inside an RPC of the critical section, retry again */ | |
66 | goto retry; | |
28f540f4 | 67 | |
50b076f4 | 68 | return err ? __hurd_fail (err) : _hurd_pgrp; |
28f540f4 RM |
69 | } |
70 | ||
71 | weak_alias (__setsid, setsid) |