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af69217f | 1 | /* Add SIG to the calling process' signal mask. |
b168057a | 2 | Copyright (C) 1998-2015 Free Software Foundation, Inc. |
af69217f UD |
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 | |
41bdb6e2 AJ |
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. | |
af69217f UD |
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 | |
41bdb6e2 | 14 | Lesser General Public License for more details. |
af69217f | 15 | |
41bdb6e2 | 16 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
17 | License along with the GNU C Library; if not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
af69217f | 19 | |
8619129f UD |
20 | #define __need_NULL |
21 | #include <stddef.h> | |
af69217f UD |
22 | #include <signal.h> |
23 | ||
24 | int | |
9d46370c | 25 | sighold (int sig) |
af69217f UD |
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. */ | |
89e28f65 | 34 | if (sigaddset (&set, sig) < 0) |
af69217f UD |
35 | return -1; |
36 | ||
37 | /* Set the new mask. */ | |
38 | return __sigprocmask (SIG_SETMASK, &set, NULL); | |
39 | } |