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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.
 *
 *  $Id: signal_2.c,v 1.1.1.1 2001-07-10 09:43:06 chris Exp $
 */
 
 
#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;
}