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// Author: Satoru Takabayashi
//
// This is a helper binary for testing signalhandler.cc.  The actual test
// is done in signalhandler_unittest.sh.

#include <csignal>
#include <cstdio>
#include <cstdlib>
#include <sstream>
#include <string>
#include <thread>

#include "config.h"
#include "glog/logging.h"
#include "stacktrace.h"
#include "symbolize.h"

#if defined(HAVE_UNISTD_H)
#  include <unistd.h>
#endif
#ifdef GLOG_USE_GFLAGS
#  include <gflags/gflags.h>
using namespace GFLAGS_NAMESPACE;
#endif
#if defined(_MSC_VER)
#  include <io.h>  // write
#endif

using namespace google;

static void DieInThread(int* a) {
  std::ostringstream oss;
  oss << std::showbase << std::hex << std::this_thread::get_id();

  fprintf(stderr, "%s is dying\n", oss.str().c_str());
  int b = 1 / *a;
  fprintf(stderr, "We should have died: b=%d\n", b);
}

static void WriteToStdout(const char* data, size_t size) {
  if (write(fileno(stdout), data, size) < 0) {
    // Ignore errors.
  }
}

int main(int argc, char** argv) {
#if defined(HAVE_STACKTRACE) && defined(HAVE_SYMBOLIZE)
  InitGoogleLogging(argv[0]);
#  ifdef GLOG_USE_GFLAGS
  ParseCommandLineFlags(&argc, &argv, true);
#  endif
  InstallFailureSignalHandler();
  const std::string command = argc > 1 ? argv[1] : "none";
  if (command == "segv") {
    // We'll check if this is outputted.
    LOG(INFO) << "create the log file";
    LOG(INFO) << "a message before segv";
    // We assume 0xDEAD is not writable.
    int* a = (int*)0xDEAD;
    *a = 0;
  } else if (command == "loop") {
    fprintf(stderr, "looping\n");
    while (true)
      ;
  } else if (command == "die_in_thread") {
    std::thread t{&DieInThread, nullptr};
    t.join();
  } else if (command == "dump_to_stdout") {
    InstallFailureWriter(WriteToStdout);
    abort();
  } else if (command == "installed") {
    fprintf(stderr, "signal handler installed: %s\n",
            IsFailureSignalHandlerInstalled() ? "true" : "false");
  } else {
    // Tell the shell script
    puts("OK");
  }
#endif
  return 0;
}