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 <errno.h>
19#include <signal.h>
20#include <hurd.h>
21#include <hurd/signal.h>
22#include <hurd/msg.h>
23
24/* If SET is not NULL, modify the current set of blocked signals
25 according to HOW, which may be SIG_BLOCK, SIG_UNBLOCK or SIG_SETMASK.
26 If OSET is not NULL, store the old set of blocked signals in *OSET. */
27int
28__sigprocmask (int how, const sigset_t *set, sigset_t *oset)
29{
30 struct hurd_sigstate *ss;
31 sigset_t old, new;
32 sigset_t pending;
33
34 if (set != NULL)
35 new = *set;
36
37 ss = _hurd_self_sigstate ();
38
39 _hurd_sigstate_lock (ss);
40
41 old = ss->blocked;
42
43 if (set != NULL)
44 {
45 switch (how)
46 {
47 case SIG_BLOCK:
48 __sigorset (dest: &ss->blocked, left: &ss->blocked, right: &new);
49 break;
50
51 case SIG_UNBLOCK:
52 ss->blocked &= ~new;
53 break;
54
55 case SIG_SETMASK:
56 ss->blocked = new;
57 break;
58
59 default:
60 _hurd_sigstate_unlock (ss);
61 errno = EINVAL;
62 return -1;
63 }
64
65 ss->blocked &= ~_SIG_CANT_MASK;
66 }
67
68 pending = _hurd_sigstate_pending (ss) & ~ss->blocked;
69
70 _hurd_sigstate_unlock (ss);
71
72 if (oset != NULL)
73 *oset = old;
74
75 if (pending)
76 /* Send a message to the signal thread so it
77 will wake up and check for pending signals. */
78 __msg_sig_post (_hurd_msgport, 0, 0, __mach_task_self ());
79
80 return 0;
81}
82
83libc_hidden_def (__sigprocmask)
84weak_alias (__sigprocmask, sigprocmask)
85

source code of glibc/sysdeps/mach/hurd/sigprocmask.c