typedef struct ucred PeerCredentials;

static int
retrievePeerCredentials (PeerCredentials *credentials, int fd) {
  socklen_t length = sizeof(*credentials);
  if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, credentials, &length) != -1) return 1;
  LogError("getsockopt[SO_PEERCRED]");
  return 0;
}