1 | /* Add SIG to the calling process' signal mask. |
2 | Copyright (C) 1998-2017 Free Software Foundation, Inc. |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. |
5 | |
6 | The GNU C Library is free software; you can redistribute it and/or |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either |
9 | version 2.1 of the License, or (at your option) any later version. |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | Lesser General Public License for more details. |
15 | |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ |
19 | |
20 | #define __need_NULL |
21 | #include <stddef.h> |
22 | #include <signal.h> |
23 | |
24 | int |
25 | sighold (int sig) |
26 | { |
27 | sigset_t set; |
28 | |
29 | /* Retrieve current signal set. */ |
30 | if (__sigprocmask (SIG_SETMASK, NULL, &set) < 0) |
31 | return -1; |
32 | |
33 | /* Add the specified signal. */ |
34 | if (sigaddset (&set, sig) < 0) |
35 | return -1; |
36 | |
37 | /* Set the new mask. */ |
38 | return __sigprocmask (SIG_SETMASK, &set, NULL); |
39 | } |
40 | |