1/* Copyright (C) 1992-2016 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 <http://www.gnu.org/licenses/>. */
17
18#include <stddef.h>
19#include <signal.h>
20#include <errno.h>
21
22/* If INTERRUPT is nonzero, make signal SIG interrupt system calls
23 (causing them to fail with EINTR); if INTERRUPT is zero, make system
24 calls be restarted after signal SIG. */
25int
26siginterrupt (int sig, int interrupt)
27{
28#ifdef SA_RESTART
29 extern sigset_t _sigintr attribute_hidden; /* Defined in signal.c. */
30 struct sigaction action;
31
32 if (__sigaction (sig, (struct sigaction *) NULL, &action) < 0)
33 return -1;
34
35 if (interrupt)
36 {
37 __sigaddset (&_sigintr, sig);
38 action.sa_flags &= ~SA_RESTART;
39 }
40 else
41 {
42 __sigdelset (&_sigintr, sig);
43 action.sa_flags |= SA_RESTART;
44 }
45
46 if (__sigaction (sig, &action, (struct sigaction *) NULL) < 0)
47 return -1;
48
49 return 0;
50#else
51 __set_errno (ENOSYS);
52 return -1;
53#endif
54}
55