Method RecvString

core/utils/fifo_test.cc:254–256

  static bool RecvString(int fd, std::string *str, size_t maxlen);
  static bool RecvString(int fd, std::string *str) {
    return RecvString(fd, str, kMaxString);
  }

  // NB: when parent_ and child_ are both 0 we haven't forked
  // successfully.