1 /* Copyright (C) 1991-2022 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 <hurd.h>
19 #include <lowlevellock.h>
20 #include "set-hooks.h"
21
22 pid_t _hurd_pid, _hurd_ppid, _hurd_pgrp;
23 int _hurd_orphaned;
24
25 static void attribute_used_retain
init_pids(void)26 init_pids (void)
27 {
28 __USEPORT (PROC,
29 ({
30 __proc_getpids (port, &_hurd_pid, &_hurd_ppid, &_hurd_orphaned);
31 __proc_getpgrp (port, _hurd_pid, &_hurd_pgrp);
32 }));
33 }
34
35 SET_RELHOOK (_hurd_proc_subinit, init_pids);
36
37 #include <hurd/msg_server.h>
38 #include "set-hooks.h"
39
40 DEFINE_HOOK (_hurd_pgrp_changed_hook, (pid_t));
41
42 /* These let user threads synchronize with an operation which changes ids. */
43 unsigned int _hurd_pids_changed_stamp;
44
45 kern_return_t
_S_msg_proc_newids(mach_port_t me,task_t task,pid_t ppid,pid_t pgrp,int orphaned)46 _S_msg_proc_newids (mach_port_t me,
47 task_t task,
48 pid_t ppid, pid_t pgrp, int orphaned)
49 {
50 int pgrp_changed;
51
52 if (task != __mach_task_self ())
53 return EPERM;
54
55 __mach_port_deallocate (__mach_task_self (), task);
56
57 pgrp_changed = pgrp != _hurd_pgrp;
58 _hurd_ppid = ppid;
59 _hurd_pgrp = pgrp;
60 _hurd_orphaned = orphaned;
61
62 if (pgrp_changed)
63 /* Run things that want notification of a pgrp change. */
64 RUN_HOOK (_hurd_pgrp_changed_hook, (pgrp));
65
66 /* Notify any waiting user threads that the id change as been completed. */
67 ++_hurd_pids_changed_stamp;
68 lll_wake (_hurd_pids_changed_stamp, GSYNC_BROADCAST);
69
70 return 0;
71 }
72