1 /* Add SIG to the calling process' signal mask.
2 Copyright (C) 1998, 2000, 2003 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
sighold(int sig)24 int sighold (int sig)
25 {
26 sigset_t set;
27
28 /* Retrieve current signal set. */
29 sigprocmask (SIG_SETMASK, NULL, &set); /* can't fail */
30
31 /* Bound-check sig, add it to the set. */
32 if (sigaddset (&set, sig) < 0)
33 return -1;
34
35 /* Set the new mask. */
36 return sigprocmask (SIG_SETMASK, &set, NULL);
37 }
38