/*	$calcurse: sigs.c,v 1.7 2008/12/28 13:13:59 culot Exp $	*/

/*
 * Calcurse - text-based organizer
 * Copyright (c) 2007-2008 Frederic Culot
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Send your feedback or comments to : calcurse@culot.org
 * Calcurse home page : http://culot.org/calcurse
 *
 */

#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>

#include "i18n.h"
#include "utils.h"

/* 
 * General signal handling routine.
 * Catch return values from children (user-defined notification commands).
 * This is needed to avoid zombie processes running on system.
 * Also catch CTRL-C (SIGINT), and SIGWINCH to resize screen automatically.
 */
static void
signal_handler (int sig)
{
  switch (sig)
    {
    case SIGCHLD:
      while (waitpid (WAIT_MYPGRP, NULL, WNOHANG) > 0)
	;
      break;
    case SIGWINCH:
      clearok (curscr, TRUE);
      (void)ungetch (KEY_RESIZE);
      break;
    }
}

/* Signal handling init. */
void
sigs_init (struct sigaction *sa)
{
  sa->sa_handler = signal_handler;
  sa->sa_flags = 0;
  sigemptyset (&sa->sa_mask);
  if (sigaction (SIGCHLD, sa, NULL) != 0)
    {
      ERROR_MSG (_("Error handling SIGCHLD signal"));
      exit_calcurse (1);
    }

  sa->sa_handler = signal_handler;
  sa->sa_flags = 0;
  sigemptyset (&sa->sa_mask);
  if (sigaction (SIGWINCH, sa, NULL) != 0)
    {
      ERROR_MSG (_("Error handling SIGWINCH signal"));      
      exit_calcurse (1);
    }

  sa->sa_handler = SIG_IGN;
  sa->sa_flags = 0;
  sigemptyset (&(sa->sa_mask));
  if (sigaction (SIGINT, sa, NULL) != 0)
    {
      ERROR_MSG (_("Error handling SIGINT signal"));      
      exit_calcurse (1);
    }
}