lib/roken/signal.c

   1 /*
   2  * Copyright (c) 1995 - 2000 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 RCSID("$Id$");
  37 #endif
  38
  39 #include <signal.h>
  40 #include "roken.h"
  41
  42 /*
  43  * We would like to always use this signal but there is a link error
  44  * on NEXTSTEP
  45  */
  46 #if !defined(NeXT) && !defined(__APPLE__)
  47 /*
  48  * Bugs:
  49  *
  50  * Do we need any extra hacks for SIGCLD and/or SIGCHLD?
  51  */
  52
  53 SigAction
  54 signal(int iSig, SigAction pAction)
  55 {
  56     struct sigaction saNew, saOld;
  57
  58     saNew.sa_handler = pAction;
  59     sigemptyset(&saNew.sa_mask);
  60     saNew.sa_flags = 0;
  61
  62     if (iSig == SIGALRM)
  63         {
  64 #ifdef SA_INTERRUPT
  65             saNew.sa_flags |= SA_INTERRUPT;
  66 #endif
  67         }
  68     else
  69         {
  70 #ifdef SA_RESTART
  71             saNew.sa_flags |= SA_RESTART;
  72 #endif
  73         }
  74
  75     if (sigaction(iSig, &saNew, &saOld) < 0)
  76         return(SIG_ERR);
  77
  78     return(saOld.sa_handler);
  79 }
  80 #endif