Merge "base: hopefully fix the mac build." am: 815f74a7 am: 8949a025

// Inline functions, so that they can be used header-only.

inline bool Pipe(unique_fd* read, unique_fd* write) {

  int pipefd[2];

#if defined(__linux__)

  if (pipe2(pipefd, O_CLOEXEC) != 0) {

    return false;

  }

#else  // defined(__APPLE__)

  if (pipe(pipefd) != 0) {

    return false;

  }

  if (fcntl(pipefd[0], F_SETFD, FD_CLOEXEC) != 0 || fcntl(pipefd[1], F_SETFD, FD_CLOEXEC) != 0) {

    close(pipefd[0]);

    close(pipefd[1]);

    return false;

  }

#endif

  read->reset(pipefd[0]);

  write->reset(pipefd[1]);

  return true;