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/* Add SIG to the calling process' signal mask.
Copyright (C) 1998-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#define __need_NULL
#include <stddef.h>
#include <signal.h>
int
sighold (int sig)
{
sigset_t set;
sigemptyset (&set);
if (sigaddset (&set, sig) < 0)
return -1;
return __sigprocmask (SIG_BLOCK, &set, NULL);
}
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