src/system/libroot/posix/signal/signal.cpp

   1 /*
   2  * Copyright 2002-2011, Haiku, Inc. All rights reserved.
   3  * Distributed under the terms of the MIT license.
   4  *
   5  * Author:
   6  *              Daniel Reinhold, danielre@users.sf.net
   7  *              Ingo Weinhold, ingo_weinhold@gmx.de
   8  */
   9
  10
  11 #include <signal.h>
  12
  13 #include <errno.h>
  14 #include <stdio.h>
  15
  16 #include <symbol_versioning.h>
  17
  18 #include <errno_private.h>
  19 #include <signal_private.h>
  20
  21
  22 static __sighandler_t
  23 signal_common(int signal, __sighandler_t signalHandler, int flags)
  24 {
  25         struct sigaction newAction, oldAction;
  26
  27         // setup the replacement sigaction
  28         newAction.sa_handler = signalHandler;
  29         newAction.sa_mask = 0;
  30         newAction.sa_flags = flags;
  31
  32         if (__sigaction(signal, &newAction, &oldAction) != 0)
  33                 return SIG_ERR;
  34
  35         // success, return the original handler
  36         return oldAction.sa_handler;
  37 }
  38
  39
  40 __sighandler_t
  41 __signal_beos(int signal, __sighandler_t signalHandler)
  42 {
  43         // check signal range
  44         if (signal < 0 || signal > MAX_SIGNAL_NUMBER_BEOS) {
  45                 __set_errno(EINVAL);
  46                 return SIG_ERR;
  47         }
  48
  49         // set the signal handler
  50         __sighandler_t result = signal_common(signal, signalHandler,
  51                 SA_BEOS_COMPATIBLE_HANDLER);
  52         if (result == SIG_ERR)
  53                 return SIG_ERR;
  54
  55         // If the signal is SIGSEGV, set the same signal handler for SIGBUS. Those
  56         // constants had the same value under BeOS.
  57         if (signal == SIGSEGV)
  58                 signal_common(SIGBUS, signalHandler, SA_BEOS_COMPATIBLE_HANDLER);
  59
  60         return result;
  61 }
  62
  63
  64 __sighandler_t
  65 __signal(int signal, __sighandler_t signalHandler)
  66 {
  67         return signal_common(signal, signalHandler, 0);
  68 }
  69
  70
  71 DEFINE_LIBROOT_KERNEL_SYMBOL_VERSION("__signal_beos", "signal@", "BASE");
  72
  73 DEFINE_LIBROOT_KERNEL_SYMBOL_VERSION("__signal", "signal@@", "1_ALPHA4");