/thirdparty/breakpad/third_party/glog/src/signalhandler_unittest.cc

 1// Copyright (c) 2008, Google Inc.
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29//
30// Author: Satoru Takabayashi
31//
32// This is a helper binary for testing signalhandler.cc.  The actual test
33// is done in signalhandler_unittest.sh.
34
35#include "utilities.h"
36
37#include <pthread.h>
38#include <signal.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <string>
42#include "glog/logging.h"
43
44using namespace GOOGLE_NAMESPACE;
45
46void* DieInThread(void*) {
47  // We assume pthread_t is an integral number or a pointer, rather
48  // than a complex struct.  In some environments, pthread_self()
49  // returns an uint64 but in some other environments pthread_self()
50  // returns a pointer.  Hence we use C-style cast here, rather than
51  // reinterpret/static_cast, to support both types of environments.
52  fprintf(stderr, "0x%lx is dying\n", (long)pthread_self());
53  // Use volatile to prevent from these to be optimized away.
54  volatile int a = 0;
55  volatile int b = 1 / a;
56  fprintf(stderr, "We should have died: b=%d\n", b);
57  return NULL;
58}
59
60void WriteToStdout(const char* data, int size) {
61  if (write(STDOUT_FILENO, data, size) < 0) {
62    // Ignore errors.
63  }
64}
65
66int main(int argc, char **argv) {
67#if defined(HAVE_STACKTRACE) && defined(HAVE_SYMBOLIZE)
68  InitGoogleLogging(argv[0]);
69#ifdef HAVE_LIB_GFLAGS
70  ParseCommandLineFlags(&argc, &argv, true);
71#endif
72  InstallFailureSignalHandler();
73  const std::string command = argc > 1 ? argv[1] : "none";
74  if (command == "segv") {
75    // We'll check if this is outputted.
76    LOG(INFO) << "create the log file";
77    LOG(INFO) << "a message before segv";
78    // We assume 0xDEAD is not writable.
79    int *a = (int*)0xDEAD;
80    *a = 0;
81  } else if (command == "loop") {
82    fprintf(stderr, "looping\n");
83    while (true);
84  } else if (command == "die_in_thread") {
85    pthread_t thread;
86    pthread_create(&thread, NULL, &DieInThread, NULL);
87    pthread_join(thread, NULL);
88  } else if (command == "dump_to_stdout") {
89    InstallFailureWriter(WriteToStdout);
90    abort();
91  } else {
92    // Tell the shell script
93    puts("OK");
94  }
95#endif
96  return 0;
97}