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