1/* Copyright (C) 1992-2022 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 <stddef.h>
19#include <signal.h>
20#include <errno.h>
21#include <sigsetops.h>
22
23/* If INTERRUPT is nonzero, make signal SIG interrupt system calls
24 (causing them to fail with EINTR); if INTERRUPT is zero, make system
25 calls be restarted after signal SIG. */
26int
27siginterrupt (int sig, int interrupt)
28{
29#ifdef SA_RESTART
30 extern sigset_t _sigintr attribute_hidden; /* Defined in signal.c. */
31 struct sigaction action;
32
33 if (__sigaction (sig, (struct sigaction *) NULL, &action) < 0)
34 return -1;
35
36 if (interrupt)
37 {
38 __sigaddset (&_sigintr, sig);
39 action.sa_flags &= ~SA_RESTART;
40 }
41 else
42 {
43 __sigdelset (&_sigintr, sig);
44 action.sa_flags |= SA_RESTART;
45 }
46
47 if (__sigaction (sig, &action, (struct sigaction *) NULL) < 0)
48 return -1;
49
50 return 0;
51#else
52 __set_errno (ENOSYS);
53 return -1;
54#endif
55}
56

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