OSX/utilities/src/simulate_crash.c

   1 //
   2 //  simulate_crash
   3 //  utilities
   4 //
   5 //  Copyright (c) 2014 Apple Inc. All Rights Reserved.
   6 //
   7
   8 #include "debugging.h"
   9
  10 #include <dispatch/dispatch.h>
  11 #include <dlfcn.h>
  12 #include <mach/mach.h>
  13
  14 /// Type to represent a boolean value.
  15 #if TARGET_OS_IPHONE  &&  __LP64__
  16 typedef bool BOOL;
  17 #else
  18 typedef signed char BOOL;
  19 // BOOL is explicitly signed so @encode(BOOL) == "c" rather than "C"
  20 // even if -funsigned-char is used.
  21 #endif
  22
  23 static void __security_simulatecrash_link(CFStringRef reason, uint32_t code)
  24 {
  25 #if !TARGET_IPHONE_SIMULATOR
  26     // Prototype defined in <CrashReporterSupport/CrashReporterSupport.h>, but objC only.
  27     // Soft linking here so we don't link unless we hit this.
  28     static BOOL (*__SimulateCrash)(pid_t pid, mach_exception_data_type_t exceptionCode, CFStringRef description);
  29
  30     static dispatch_once_t once = 0;
  31     dispatch_once(&once, ^{
  32         void *image = dlopen("/System/Library/PrivateFrameworks/CrashReporterSupport.framework/CrashReporterSupport", RTLD_NOW);
  33         if (image)
  34             __SimulateCrash = dlsym(image, "SimulateCrash");
  35         else
  36             __SimulateCrash = NULL;
  37     });
  38
  39     if (__SimulateCrash)
  40         __SimulateCrash(getpid(), code, reason);
  41     else
  42         secerror("SimulateCrash not available");
  43 #else
  44     secerror("SimulateCrash not available in iOS simulator");
  45 #endif
  46 }
  47
  48 static int __simulate_crash_counter = -1;
  49
  50 void __security_simulatecrash(CFStringRef reason, uint32_t code)
  51 {
  52     secerror("Simulating crash, reason: %@, code=%08x", reason, code);
  53     if (__simulate_crash_counter < 0)
  54         __security_simulatecrash_link(reason, code);
  55     else
  56         __simulate_crash_counter++;
  57 }
  58
  59 int __security_simulatecrash_enable(bool enable)
  60 {
  61     int count = __simulate_crash_counter;
  62     __simulate_crash_counter = enable ? -1 : 0;
  63     return count;
  64 }