Function ExecuteCommand

fuzz/libfuzzer/FuzzerUtilFuchsia.cpp:481–575

}

int ExecuteCommand(const Command &Cmd) {
  zx_status_t rc;

  // Convert arguments to C array
  auto Args = Cmd.getArguments();
  size_t Argc = Args.size();
  assert(Argc != 0);
  std::unique_ptr<const char *[]> Argv(new const char *[Argc + 1]);
  for (size_t i = 0; i < Argc; ++i)
    Argv[i] = Args[i].c_str();
  Argv[Argc] = nullptr;

  // Determine output.  On Fuchsia, the fuzzer is typically run as a component
  // that lacks a mutable working directory. Fortunately, when this is the case
  // a mutable output directory must be specified using "-artifact_prefix=...",
  // so write the log file(s) there.
  // However, we don't want to apply this logic for absolute paths.
  int FdOut = STDOUT_FILENO;
  bool discardStdout = false;
  bool discardStderr = false;

  if (Cmd.hasOutputFile()) {
    std::string Path = Cmd.getOutputFile();
    if (Path == getDevNull()) {
      // On Fuchsia, there's no "/dev/null" like-file, so we
      // just don't copy the FDs into the spawned process.
      discardStdout = true;
    } else {
      bool IsAbsolutePath = Path.length() > 1 && Path[0] == '/';
      if (!IsAbsolutePath && Cmd.hasFlag("artifact_prefix"))
        Path = Cmd.getFlagValue("artifact_prefix") + "/" + Path;

      FdOut = open(Path.c_str(), O_WRONLY | O_CREAT | O_TRUNC, 0);
      if (FdOut == -1) {
        Printf("libFuzzer: failed to open %s: %s\n", Path.c_str(),
               strerror(errno));
        return ZX_ERR_IO;
      }
    }
  }
  auto CloseFdOut = at_scope_exit([FdOut]() {
    if (FdOut != STDOUT_FILENO)
      close(FdOut);
  });

  // Determine stderr
  int FdErr = STDERR_FILENO;
  if (Cmd.isOutAndErrCombined()) {
    FdErr = FdOut;
    if (discardStdout)
      discardStderr = true;
  }

  // Clone the file descriptors into the new process
  std::vector<fdio_spawn_action_t> SpawnActions;
  SpawnActions.push_back(clone_fd_action(STDIN_FILENO, STDIN_FILENO));

  if (!discardStdout)