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/*

 *  signal(2) - Install signal handler

 *

 *  COPYRIGHT (c) 1989-1999.

 *  On-Line Applications Research Corporation (OAR).

 *

 *  The license and distribution terms for this file may be

 *  found in the file LICENSE in this distribution or at

 *  http://www.OARcorp.com/rtems/license.html.

 *

 *  signal_2.c,v 1.3 2001/01/24 14:17:28 joel Exp

 */

#if HAVE_CONFIG_H

#include "config.h"

#endif

#include <signal.h>

#include <errno.h>

typedef void (*sighandler_t)(int);

sighandler_t signal(

  int           signum,

  sighandler_t  handler

)

{

  struct sigaction s;

  struct sigaction old;

  s.sa_handler = handler ;

  sigemptyset(&s.sa_mask);

  /*

   *  Depending on which system we want to behave like, one of

   *  the following versions should be chosen.

   */

/* #define signal_like_linux */

#if defined(signal_like_linux)

  s.sa_flags   = SA_RESTART | SA_INTERRUPT | SA_NOMASK;

  s.sa_restorer= NULL ;

#elif defined(signal_like_SVR4)

  s.sa_flags   = SA_RESTART;

#else

  s.sa_flags   = 0;

#endif

  sigaction( signum, &s, &old );

  return (sighandler_t) old.sa_handler;

}