sys/sigaction.c

   1 /*
   2  * Copyright (c) 1999-2017 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #if __has_include(<CrashReporterClient.h>)
  25 #include <CrashReporterClient.h>
  26 #else
  27 #define CRSetCrashLogMessage(...)
  28 #endif
  29 #include <stdlib.h>
  30 #include <stdio.h>
  31 #include <unistd.h>
  32 #include <signal.h>
  33 #include <sys/signal.h>
  34 #include <errno.h>
  35
  36 #pragma clang diagnostic push
  37 #pragma clang diagnostic ignored "-Wstrict-prototypes"
  38
  39 extern int __platform_sigaction (int sig,
  40                 const struct sigaction * __restrict nsv,
  41                 struct sigaction * __restrict osv);
  42
  43 int
  44 sigaction (int sig, const struct sigaction * __restrict nsv,
  45                 struct sigaction * __restrict osv)
  46 {
  47         int ret = __platform_sigaction(sig, nsv, osv);
  48 #ifdef FEATURE_SIGNAL_RESTRICTION
  49         // Note: The "sig != 0" here is to force the compiler to maintain that "sig"
  50         // is live, and in a register, after __sigaction so it is visible in the
  51         // crashing register state.
  52         if (ret == -1 && errno == ENOTSUP && sig != 0) {
  53                 CRSetCrashLogMessage("sigaction on fatal signals is not supported");
  54                 __builtin_trap();
  55         }
  56 #endif
  57         return ret;
  58 }
  59
  60 // XXX
  61 #ifdef __DYNAMIC__
  62
  63 int
  64 _sigaction_nobind (sig, nsv, osv)
  65         int sig;
  66         register const struct sigaction *nsv;
  67         register struct sigaction *osv;
  68 {
  69     return sigaction(sig, nsv, osv);
  70 }
  71 #endif
  72
  73 #pragma clang diagnostic pop