1 // Copyright (c) 2008, Google Inc.
2 // All rights reserved.
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5 // modification, are permitted provided that the following conditions are
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16 // this software without specific prior written permission.
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30 // Author: Satoru Takabayashi
32 // This is a helper binary for testing signalhandler.cc. The actual test
33 // is done in signalhandler_unittest.sh.
35 #include "utilities.h"
42 #include "glog/logging.h"
44 #ifdef HAVE_LIB_GFLAGS
45 #include <gflags/gflags.h>
46 using namespace gflags;
49 using namespace GOOGLE_NAMESPACE;
51 void* DieInThread(void*) {
52 // We assume pthread_t is an integral number or a pointer, rather
53 // than a complex struct. In some environments, pthread_self()
54 // returns an uint64 but in some other environments pthread_self()
55 // returns a pointer. Hence we use C-style cast here, rather than
56 // reinterpret/static_cast, to support both types of environments.
57 fprintf(stderr, "0x%lx is dying\n", (long)pthread_self());
58 // Use volatile to prevent from these to be optimized away.
60 volatile int b = 1 / a;
61 fprintf(stderr, "We should have died: b=%d\n", b);
65 void WriteToStdout(const char* data, int size) {
66 if (write(STDOUT_FILENO, data, size) < 0) {
71 int main(int argc, char **argv) {
72 #if defined(HAVE_STACKTRACE) && defined(HAVE_SYMBOLIZE)
73 InitGoogleLogging(argv[0]);
74 #ifdef HAVE_LIB_GFLAGS
75 ParseCommandLineFlags(&argc, &argv, true);
77 InstallFailureSignalHandler();
78 const std::string command = argc > 1 ? argv[1] : "none";
79 if (command == "segv") {
80 // We'll check if this is outputted.
81 LOG(INFO) << "create the log file";
82 LOG(INFO) << "a message before segv";
83 // We assume 0xDEAD is not writable.
84 int *a = (int*)0xDEAD;
86 } else if (command == "loop") {
87 fprintf(stderr, "looping\n");
89 } else if (command == "die_in_thread") {
91 pthread_create(&thread, NULL, &DieInThread, NULL);
92 pthread_join(thread, NULL);
93 } else if (command == "dump_to_stdout") {
94 InstallFailureWriter(WriteToStdout);
97 // Tell the shell script