Function ExecDeathTestChildMain

test/gtest/gtest-all.cc:7438–7464

The main function for a threadsafe-style death test child process. This function is called in a clone()-ed process and thus must avoid any potentially unsafe operations like malloc or libc functions.

// This function is called in a clone()-ed process and thus must avoid
// any potentially unsafe operations like malloc or libc functions.
static int ExecDeathTestChildMain(void* child_arg) {
  ExecDeathTestArgs* const args = static_cast<ExecDeathTestArgs*>(child_arg);
  GTEST_DEATH_TEST_CHECK_SYSCALL_(close(args->close_fd));

  // We need to execute the test program in the same environment where
  // it was originally invoked.  Therefore we change to the original
  // working directory first.
  const char* const original_dir =
      UnitTest::GetInstance()->original_working_dir();
  // We can safely call chdir() as it's a direct system call.
  if (chdir(original_dir) != 0) {
    DeathTestAbort(std::string("chdir(\"") + original_dir + "\") failed: " +
                   GetLastErrnoDescription());
    return EXIT_FAILURE;
  }

  // We can safely call execve() as it's a direct system call.  We
  // cannot use execvp() as it's a libc function and thus potentially
  // unsafe.  Since execve() doesn't search the PATH, the user must
  // invoke the test program via a valid path that contains at least
  // one path separator.
  execve(args->argv[0], args->argv, GetEnviron());
  DeathTestAbort(std::string("execve(") + args->argv[0] + ", ...) in " +
                 original_dir + " failed: " +
                 GetLastErrnoDescription());
  return EXIT_FAILURE;
}
#  endif  // !GTEST_OS_QNX

// Two utility routines that together determine the direction the stack