Îõ³h*7,0.1.0.1 Safe-Inferred$ systemd-api¦Check for file descriptors passed by the system manager. Returns the number of received file descriptors. If no file descriptors have been received, zero is returned. systemd-api#unset environment (non-zero unsets  LISTEN_FDS,  LISTEN_PID, and LISTEN_FDNAMES) systemd-apiFile descriptor systemd-api Socket family systemd-api Socket type systemd-apiÀPositive: require listen mode. Zero: require non-listening mode.systemd-api-0.1.0.1-inplace Linux.Systemd systemd-api listenFdsisSocket