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 <stddef.h>
21#include <unistd.h>
22
23
24/* Change the set of blocked signals to SET,
25 wait until a signal arrives, and restore the set of blocked signals. */
26int
27__sigsuspend (const sigset_t *set)
28{
29 sigset_t oset;
30 int save;
31
32 if (set == NULL)
33 {
34 __set_errno (EINVAL);
35 return -1;
36 }
37
38 if (sigprocmask (SIG_SETMASK, set, &oset) < 0)
39 return -1;
40
41 (void) pause();
42 save = errno;
43
44 if (sigprocmask (SIG_SETMASK, &oset, (sigset_t *) NULL) < 0)
45 return -1;
46
47 __set_errno (save);
48 return -1;
49}
50libc_hidden_def (__sigsuspend)
51weak_alias (__sigsuspend, sigsuspend)
52

source code of glibc/sysdeps/posix/sigsuspend.c