/* signals.c - abstracts signal handling
 * Time-stamp: <2010-11-01 17:25:41 nk>
 *
 * (c) 2004-2010 Nicholas J. Kain <njkain at gmail dot com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include "log.h"

void hook_signal(int signum, void (*fn)(int), int flags) {
  struct sigaction new_action;

  new_action.sa_handler = fn;
  sigemptyset(&new_action.sa_mask);
  new_action.sa_flags = flags;

  if (sigaction(signum, &new_action, NULL)) {
    log_line("FATAL - failed to hook signal %i\n", signum);
    exit(EXIT_FAILURE);
  }
}

void disable_signal(int signum) {
  struct sigaction new_action;

  new_action.sa_handler = SIG_IGN;
  sigemptyset(&new_action.sa_mask);
  new_action.sa_flags = 0;

  if (sigaction(signum, &new_action, NULL)) {
    log_line("FATAL - failed to ignore signal %i\n", signum);
    exit(EXIT_FAILURE);
  }
}