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- /* Copyright (C) 1998, 2000, 2005 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- 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
- <http://www.gnu.org/licenses/>. */
- #include <errno.h>
- #define __need_NULL
- #include <stddef.h>
- #include <signal.h>
- #include <string.h>
- /* Set the disposition for SIG. */
- __sighandler_t sigset (int sig, __sighandler_t disp)
- {
- struct sigaction act, oact;
- sigset_t set;
- /* Check signal extents to protect __sigismember. */
- if (disp == SIG_ERR || sig < 1 || sig >= NSIG)
- {
- __set_errno (EINVAL);
- return SIG_ERR;
- }
- #ifdef SIG_HOLD
- /* Handle SIG_HOLD first. */
- if (disp == SIG_HOLD)
- {
- __sigemptyset (&set);
- __sigaddset (&set, sig);
- /* Add the signal set to the current signal mask. */
- sigprocmask (SIG_BLOCK, &set, NULL); /* can't fail */
- return SIG_HOLD;
- }
- #endif /* SIG_HOLD */
- memset(&act, 0, sizeof(act));
- act.sa_handler = disp;
- /* In Linux (as of 2.6.25), fails only if sig is SIGKILL or SIGSTOP */
- if (sigaction (sig, &act, &oact) < 0)
- return SIG_ERR;
- /* Create an empty signal set. Add the specified signal. */
- __sigemptyset (&set);
- __sigaddset (&set, sig);
- /* Remove the signal set from the current signal mask. */
- sigprocmask (SIG_UNBLOCK, &set, NULL); /* can't fail */
- return oact.sa_handler;
- }
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