int shmOpenImpl()

in cachelib/shm/PosixShmSegment.cpp [35:69]

• 30 lines of code
• 10 McCabe index (conditional complexity)

int shmOpenImpl(const char* name, int flags) {
  const int fd = shm_open(name, flags, kRWMode);

  if (fd != -1) {
    return fd;
  }

  switch (errno) {
  case EEXIST:
  case EMFILE:
  case ENFILE:
  case EACCES:
    util::throwSystemError(errno);
    break;
  case ENAMETOOLONG:
  case EINVAL:
    util::throwSystemError(errno, "Invalid segment name");
    break;
  case ENOENT:
    if (!(flags & O_CREAT)) {
      util::throwSystemError(errno);
    } else {
      XDCHECK(false);
      // FIXME: posix says that ENOENT is thrown only when O_CREAT
      // is not set. However, it seems to be set even when O_CREAT
      // was set and the parent of path name does not exist.
      util::throwSystemError(errno, "Invalid errno");
    }
    break;
  default:
    XDCHECK(false);
    util::throwSystemError(errno, "Invalid errno");
  }
  return kInvalidFD;
}