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. */ |
25 | int |
26 | siginterrupt (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 | |