/* signals.c
 * - Functions for signal handling in ices
 * Copyright (c) 2000 Alexander Haväng
 *
 * 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.
 *
 */

#include "definitions.h"

#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif

#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif

#ifdef HAVE_SYS_SIGNAL_H
#include <sys/signal.h>
#endif

/* Private function declarations */
static RETSIGTYPE signals_child (const int sig);
static RETSIGTYPE signals_int (const int sig);
static RETSIGTYPE signals_hup (const int sig);
static RETSIGTYPE signals_usr1 (const int sig);

/* Global function definitions */

/* Setup signal handlers for some signals that we don't want
 * delivered to icecast, and some that we want to handle in
 * a certain way, like SIGINT to cleanup and exit, and hup
 * to close and reopen logfiles */
void
ices_signals_setup (void)
{
#ifndef _WIN32
  struct sigaction sa;

  sigemptyset (&sa.sa_mask);
  sa.sa_flags = 0;

  sa.sa_handler = SIG_IGN;
  sigaction (SIGPIPE, &sa, NULL);
  sigaction (SIGIO, &sa, NULL);
  sigaction (SIGALRM, &sa, NULL);

  sa.sa_handler = signals_int;
  sigaction (SIGINT, &sa, NULL);
  sigaction (SIGTERM, &sa, NULL);

#ifdef SA_RESTART
  sa.sa_flags = SA_RESTART;
#endif
  sa.sa_handler = signals_child;
  sigaction (SIGCHLD, &sa, NULL);

  sa.sa_handler = signals_hup;
  sigaction (SIGHUP, &sa, NULL);

  sa.sa_handler = signals_usr1;
  sigaction (SIGUSR1, &sa, NULL);
}

/* Guess we fork()ed, let's take care of the dead process */
static RETSIGTYPE
signals_child (const int sig)
{
  int stat;

  wait (&stat);
}

/* SIGINT, ok, let's be nice and just drop dead */
static RETSIGTYPE
signals_int (const int sig)
{
  ices_log_debug ("Caught signal, shutting down...");
  ices_setup_shutdown ();
}
			
/* SIGHUP caught, let's cycle logfiles and try to reload the playlist module */
static RETSIGTYPE
signals_hup (const int sig)
{
  ices_log_debug ("Caught SIGHUP, cycling logfiles and reloading playlist...");
  ices_log_reopen_logfile ();
  ices_playlist_reload ();
}

/* I'm not sure whether I'll keep this... */
static RETSIGTYPE
signals_usr1 (const int sig)
{
  ices_log_debug ("Caught SIGUSR1, skipping to next track...");
  ices_stream_next ();
#endif
}