text: 
  /*
   * Copyright (c) 1999-2004 Damien Miller <djm@mindrot.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include "includes.h"
  
  #include <sys/types.h>
  #ifdef HAVE_SYS_SELECT_H
  # include <sys/select.h>
  #endif
  #ifdef HAVE_SYS_TIME_H
  # include <sys/time.h>
  #endif
  
  #include <err.h>
  #include <string.h>
  #include <signal.h>
  #include <stdlib.h>
  #include <time.h>
  #include <unistd.h>
  
  mysig_t
  mysignal(int sig, mysig_t act)
  {
  #ifdef HAVE_SIGACTION
  	struct sigaction sa, osa;
  
  	if (sigaction(sig, NULL, &osa) == -1)
  		return (mysig_t) -1;
  	if (osa.sa_handler != act) {
  		memset(&sa, 0, sizeof(sa));
  		sigemptyset(&sa.sa_mask);
  		sa.sa_flags = 0;
  #ifdef SA_INTERRUPT
  		if (sig == SIGALRM)
  			sa.sa_flags |= SA_INTERRUPT;
  #endif
  		sa.sa_handler = act;
  		if (sigaction(sig, &sa, NULL) == -1)
  			return (mysig_t) -1;
  	}
  	return (osa.sa_handler);
  #else
  	#undef signal
  	return (signal(sig, act));
  #endif
  }
  