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// exception_handler_test.cc: Unit tests for google_breakpad::ExceptionHandler

#include <sys/stat.h>
#include <unistd.h>

#include "breakpad_googletest_includes.h"
#include "client/mac/handler/exception_handler.h"
#include "client/mac/tests/auto_tempdir.h"

using std::string;
using google_breakpad::AutoTempDir;
using google_breakpad::ExceptionHandler;
using testing::Test;

static void Crasher() {
  int *a = (int*)0x42;

  fprintf(stdout, "Going to crash...\n");
  fprintf(stdout, "A = %d", *a);
}

static void SoonToCrash() {
  Crasher();
}

static bool MDCallback(const char *dump_dir, const char *file_name,
                       void *context, bool success) {
  string path(dump_dir);
  path.append("/");
  path.append(file_name);
  path.append(".dmp");

  int fd = *reinterpret_cast<int*>(context);
  (void)write(fd, path.c_str(), path.length() + 1);
  close(fd);
  exit(0);
  // not reached
  return true;
}

TEST(ExceptionHandler, InProcess) {
  AutoTempDir tempDir;
  // Give the child process a pipe to report back on.
  int fds[2];
  ASSERT_EQ(0, pipe(fds));
  // Fork off a child process so it can crash.
  pid_t pid = fork();
  if (pid == 0) {
    close(fds[0]);
    ExceptionHandler eh(tempDir.path, NULL, MDCallback, &fds[1], true);
    // crash
    SoonToCrash();
    // not reached
    exit(1);
  }
  ASSERT_NE(-1, pid);
  // Wait for the background process to return the minidump file.
  close(fds[1]);
  char minidump_file[PATH_MAX];
  ssize_t nbytes = read(fds[0], minidump_file, sizeof(minidump_file));
  ASSERT_NE(0, nbytes);
  // Ensure that minidump file exists and is > 0 bytes.
  struct stat st;
  ASSERT_EQ(0, stat(minidump_file, &st));
  ASSERT_LT(0, st.st_size);

  // Child process should have exited with a zero status.
  int ret;
  ASSERT_EQ(pid, waitpid(pid, &ret, 0));
  EXPECT_NE(0, WIFEXITED(ret));
  EXPECT_EQ(0, WEXITSTATUS(ret));
}