Bump version: 4.12 → 4.13

.bumpversion.cfg

@@ -1,7 +1,7 @@
 [bumpversion]
 commit = True
 tag = True
-current_version = 4.12
+current_version = 4.13
 parse = (?P<major>\d+)\.(?P<minor>\d+)
 serialize = 
 	{major}.{minor}

README.md

@@ -17,6 +17,7 @@
 | [DV-timings](https://linuxtv.org/downloads/v4l-dvb-apis-new/userspace-api/v4l/dv-timings.html) support -<br>the ability to change resolution<br>on the fly by source signal | ✔ | ☹ Partially yes <sup>1</sup> |
 | Option to skip frames when streaming<br>static images by HTTP to save the traffic | ✔ <sup>2</sup> | ✘ |
 | Streaming via UNIX domain socket | ✔ | ✘ |
+| Systemd socket activation | ✔ | ✘ |
 | Debug logs without recompiling,<br>performance statistics log,<br>access to HTTP streaming parameters | ✔ | ✘ |
 | Option to serve files<br>with a built-in HTTP server | ✔ | ☹ Regular files only |
 | Signaling about the stream state<br>on GPIO using [libgpiod](https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/about) | ✔ | ✘ |
@@ -37,7 +38,7 @@ If you're going to live-stream from your backyard webcam and need to control it,
 You'll need  ```make```, ```gcc```, ```libevent``` with ```pthreads``` support, ```libjpeg8```/```libjpeg-turbo``` and ```libbsd``` (only for Linux).
 
 * Arch: `sudo pacman -S libevent libjpeg-turbo libutil-linux libbsd`.
-* Raspbian: `sudo apt install libevent-dev libjpeg8-dev libbsd-dev`. Add `libraspberrypi-dev` for `WITH_OMX=1` and `libgpiod-dev` for `WITH_GPIO=1`.
+* Raspbian: `sudo apt install libevent-dev libjpeg8-dev libbsd-dev`. Add `libraspberrypi-dev` for `WITH_OMX=1`, `libgpiod-dev` for `WITH_GPIO=1` and `libsystemd-dev` for `WITH_SYSTEMD=1`.
 * Debian/Ubuntu: `sudo apt install build-essential libevent-dev libjpeg-dev libbsd-dev`.
 
 On Raspberry Pi you can build the program with OpenMAX IL. To do this pass option ```WITH_OMX=1``` to ```make```. To enable GPIO support install [libgpiod](https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/about) and pass option ```WITH_GPIO=1```. If the compiler reports about a missing function ```pthread_get_name_np()``` (or similar), add option ```WITH_PTHREAD_NP=0``` (it's enabled by default). For the similar error with ```setproctitle()``` add option ```WITH_SETPROCTITLE=0```.

README.ru.md

@@ -17,6 +17,7 @@
 | Поддержка [DV-таймингов](https://linuxtv.org/downloads/v4l-dvb-apis-new/userspace-api/v4l/dv-timings.html) - возможности<br>изменения  параметров разрешения<br>трансляции на лету по сигналу<br>источника (устройства видеозахвата) | ✔ | ☹ Условно есть <sup>1</sup> |
 | Возможность пропуска фреймов при передаче<br>статического изображения по HTTP<br>для экономии трафика | ✔ <sup>2</sup> | ✘ |
 | Стрим через UNIX domain socket | ✔ | ✘ |
+| Systemd socket activation | ✔ | ✘ |
 | Дебаг-логи без перекомпиляции,<br>логгирование статистики производительности,<br>возможность получения параметров<br>трансляции по HTTP | ✔ | ✘ |
 | Возможность сервить файлы встроенным<br>HTTP-сервером  | ✔ | ☹ Нет каталогов |
 | Вывод сигналов о состоянии стрима на GPIO<br>с помощью [libgpiod](https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/about) | ✔ | ✘ |
@@ -37,7 +38,7 @@
 Для сборки вам понадобятся ```make```, ```gcc```, ```libevent``` с поддержкой ```pthreads```, ```libjpeg8```/```libjpeg-turbo``` и ```libbsd``` (только для Linux).
 
 * Arch: `sudo pacman -S libevent libjpeg-turbo libutil-linux libbsd`.
-* Raspbian: `sudo apt install libevent-dev libjpeg8-dev libbsd-dev`.  Добавьте `libraspberrypi-dev` для сборки с `WITH_OMX=1` и `libgpiod` для `WITH_GPIO=1`.
+* Raspbian: `sudo apt install libevent-dev libjpeg8-dev libbsd-dev`.  Добавьте `libraspberrypi-dev` для сборки с `WITH_OMX=1`, `libgpiod` для `WITH_GPIO=1` и `libsystemd-dev` для `WITH_SYSTEMD=1`.
 * Debian/Ubuntu: `sudo apt install build-essential libevent-dev libjpeg-dev libbsd-dev`.
 
 На Raspberry Pi программу можно собрать с поддержкой OpenMAX IL. Для этого передайте ```make``` параметр ```WITH_OMX=1```. Для включения сборки с поддержкой GPIO установите [libgpiod](https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/about) и добавьте параметр ```WITH_GPIO=1```. Если при сборке компилятор ругается на отсутствие функции ```pthread_get_name_np()``` или другой подобной, добавьте параметр ```WITH_PTHREAD_NP=0``` (по умолчанию он включен). При аналогичной ошибке с функцией ```setproctitle()``` добавьте параметр ```WITH_SETPROCTITLE=0```.

man/ustreamer-dump.1

@@ -1,6 +1,6 @@
 .\" Manpage for ustreamer-dump.
 .\" Open an issue or pull request to https://github.com/pikvm/ustreamer to correct errors or typos
-.TH USTREAMER-DUMP 1 "version 4.12" "January 2021"
+.TH USTREAMER-DUMP 1 "version 4.13" "January 2021"
 
 .SH NAME
 ustreamer-dump \- Dump uStreamer's memory sink to file

man/ustreamer.1

@@ -1,6 +1,6 @@
 .\" Manpage for ustreamer.
 .\" Open an issue or pull request to https://github.com/pikvm/ustreamer to correct errors or typos
-.TH USTREAMER 1 "version 4.12" "November 2020"
+.TH USTREAMER 1 "version 4.13" "November 2020"
 
 .SH NAME
 ustreamer \- stream MJPG video from any V4L2 device to the network
@@ -167,12 +167,15 @@ Bind to this TCP port. Default: 8080.
 .BR \-U\ \fIpath ", " \-\-unix\ \fIpath
 Bind to UNIX domain socket. Default: disabled.
 .TP
-.BR \-d ", " \-\-unix\-rm
+.BR \-D ", " \-\-unix\-rm
 Try to remove old unix socket file before binding. default: disabled.
 .TP
 .BR \-M\ \fImode ", " \-\-unix\-mode\ \fImode
 Set UNIX socket file permissions (like 777). Default: disabled.
 .TP
+.BR \-S ", " \-\-systemd
+Bind to systemd socket for socket activation. Required \fBWITH_SYSTEMD\fR feature. Default: disabled.
+.TP
 .BR \-\-user\ \fIname
 HTTP basic auth user. Default: disabled.
 .TP
@@ -189,7 +192,7 @@ Don't send identical frames to clients, but no more than specified number. It ca
 Override image resolution for the /state. Default: disabled.
 .TP
 .BR \-\-tcp\-nodelay
-Set TCP_NODELAY flag to the client /stream socket. Ignored for \-\-unix.
+Set TCP_NODELAY flag to the client /stream socket. Only for TCP socket.
 Default: disabled.
 .TP
 .BR \-\-allow\-origin\ \fIstr
@@ -246,6 +249,9 @@ Intarval between keyframes. Default: 30.
 .BR \-\-exit\-on\-parent\-death
 Exit the program if the parent process is dead. Required \fBHAS_PDEATHSIG\fR feature. Default: disabled.
 .TP
+.BR \-\-exit\-on\-no\-clients \fIsec
+Exit the program if there have been no stream or sink clients or any HTTP requests in the last N seconds. Default: 0 (disabled).
+.TP
 .BR \-\-process\-name\-prefix\ \fIstr
 Set process name prefix which will be displayed in the process list like '\fIstr: ustreamer \-\-blah\-blah\-blah'\fR. Required \fBWITH_SETPROCTITLE\fR feature. Default: disabled.
 .TP

pkg/arch/PKGBUILD

@@ -3,7 +3,7 @@
 
 
 pkgname=ustreamer
-pkgver=4.12
+pkgver=4.13
 pkgrel=1
 pkgdesc="Lightweight and fast MJPG-HTTP streamer"
 url="https://github.com/pikvm/ustreamer"
@@ -31,6 +31,11 @@ if [ -e /usr/include/janus/plugins/plugin.h ];then
 	makedepends+=(janus-gateway-pikvm)
 	_options="$_options WITH_JANUS=1"
 fi
+if [ -e /usr/include/systemd/sd-daemon.h ];then
+	depends+=(systemd)
+	makedepends+=(systemd)
+	_options="$_options WITH_SYSTEMD=1"
+fi
 
 
 # LD does not link mmal with this option

pkg/openwrt/Makefile

@@ -6,7 +6,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=ustreamer
-PKG_VERSION:=4.12
+PKG_VERSION:=4.13
 PKG_RELEASE:=1
 PKG_MAINTAINER:=Maxim Devaev <mdevaev@gmail.com>
 

python/setup.py

@@ -8,7 +8,7 @@ from distutils.core import setup
 if __name__ == "__main__":
     setup(
         name="ustreamer",
-        version="4.12",
+        version="4.13",
         description="uStreamer tools",
         author="Maxim Devaev",
         author_email="mdevaev@gmail.com",

src/Makefile

@@ -59,6 +59,13 @@ _USTR_SRCS += $(shell ls ustreamer/gpio/*.c)
 endif
 
 
+ifneq ($(call optbool,$(WITH_SYSTEMD)),)
+_USTR_LIBS += -lsystemd
+override _CFLAGS += -DWITH_SYSTEMD
+_USTR_SRCS += $(shell ls ustreamer/http/systemd/*.c)
+endif
+
+
 WITH_PTHREAD_NP ?= 1
 ifneq ($(call optbool,$(WITH_PTHREAD_NP)),)
 override _CFLAGS += -DWITH_PTHREAD_NP

src/libs/config.h

@@ -23,7 +23,7 @@
 #pragma once
 
 #define VERSION_MAJOR 4
-#define VERSION_MINOR 12
+#define VERSION_MINOR 13
 
 #define MAKE_VERSION2(_major, _minor) #_major "." #_minor
 #define MAKE_VERSION1(_major, _minor) MAKE_VERSION2(_major, _minor)

src/libs/process.h

@@ -137,3 +137,11 @@ INLINE void process_notify_parent(void) {
 		LOG_PERROR("Can't send SIGUSR2 to the parent process %d", parent);
 	}
 }
+
+INLINE void process_suicide(void) {
+	pid_t pid = getpid();
+
+	if (kill(pid, SIGTERM) < 0) {
+		LOG_PERROR("Can't send SIGTERM to own pid %d", pid);
+	}
+}

src/ustreamer/http/server.c

@@ -36,7 +36,8 @@ static void _http_callback_stream(struct evhttp_request *request, void *v_server
 static void _http_callback_stream_write(struct bufferevent *buf_event, void *v_ctx);
 static void _http_callback_stream_error(struct bufferevent *buf_event, short what, void *v_ctx);
 
-static void _http_exposed_refresh(int fd, short event, void *v_server);
+static void _http_request_watcher(int fd, short event, void *v_server);
+static void _http_refresher(int fd, short event, void *v_server);
 static void _http_queue_send_stream(server_s *server, bool stream_updated, bool frame_updated);
 
 static bool _expose_new_frame(server_s *server);
@@ -80,14 +81,19 @@ server_s *server_init(stream_s *stream) {
 }
 
 void server_destroy(server_s *server) {
-	if (RUN(refresh)) {
+	if (RUN(refresher)) {
-		event_del(RUN(refresh));
+		event_del(RUN(refresher));
-		event_free(RUN(refresh));
+		event_free(RUN(refresher));
+	}
+
+	if (RUN(request_watcher)) {
+		event_del(RUN(request_watcher));
+		event_free(RUN(request_watcher));
 	}
 
 	evhttp_free(RUN(http));
-	if (RUN(unix_fd)) {
+	if (RUN(ext_fd)) {
-		close(RUN(unix_fd));
+		close(RUN(ext_fd));
 	}
 	event_base_free(RUN(base));
 
@@ -128,18 +134,23 @@ int server_listen(server_s *server) {
 	EX(notify_last_width) = EX(frame->width);
 	EX(notify_last_height) = EX(frame->height);
 
+	if (server->exit_on_no_clients > 0) {
+		RUN(last_request_ts) = get_now_monotonic();
+		struct timeval interval = {0};
+		interval.tv_usec = 100000;
+		assert((RUN(request_watcher) = event_new(RUN(base), -1, EV_PERSIST, _http_request_watcher, server)));
+		assert(!event_add(RUN(request_watcher), &interval));
+	}
+
 	{
-		struct timeval refresh_interval;
+		struct timeval interval = {0};
-
-		refresh_interval.tv_sec = 0;
 		if (STREAM(dev->desired_fps) > 0) {
-			refresh_interval.tv_usec = 1000000 / (STREAM(dev->desired_fps) * 2);
+			interval.tv_usec = 1000000 / (STREAM(dev->desired_fps) * 2);
 		} else {
-			refresh_interval.tv_usec = 16000; // ~60fps
+			interval.tv_usec = 16000; // ~60fps
 		}
-
+		assert((RUN(refresher) = event_new(RUN(base), -1, EV_PERSIST, _http_refresher, server)));
-		assert((RUN(refresh) = event_new(RUN(base), -1, EV_PERSIST, _http_exposed_refresh, server)));
+		assert(!event_add(RUN(refresher), &interval));
-		assert(!event_add(RUN(refresh), &refresh_interval));
 	}
 
 	evhttp_set_timeout(RUN(http), server->timeout);
@@ -160,7 +171,7 @@ int server_listen(server_s *server) {
 
 	if (server->unix_path[0] != '\0') {
 		LOG_DEBUG("Binding HTTP to UNIX socket '%s' ...", server->unix_path);
-		if ((RUN(unix_fd) = evhttp_my_bind_unix(
+		if ((RUN(ext_fd) = evhttp_my_bind_unix(
 			RUN(http),
 			server->unix_path,
 			server->unix_rm,
@@ -169,9 +180,16 @@ int server_listen(server_s *server) {
 			return -1;
 		}
 		LOG_INFO("Listening HTTP on UNIX socket '%s'", server->unix_path);
-		if (server->tcp_nodelay) {
+
-			LOG_ERROR("TCP_NODELAY flag can't be used with UNIX socket and will be ignored");
+#	ifdef WITH_SYSTEMD
+	} else if (server->systemd) {
+		LOG_DEBUG("Binding HTTP to systemd socket ...");
+		if ((RUN(ext_fd) = evhttp_my_bind_systemd(RUN(http))) < 0) {
+			return -1;
 		}
+		LOG_INFO("Listening systemd socket ...");
+#	endif
+
 	} else {
 		LOG_DEBUG("Binding HTTP to [%s]:%u ...", server->host, server->port);
 		if (evhttp_bind_socket(RUN(http), server->host, server->port) < 0) {
@@ -198,6 +216,8 @@ void server_loop_break(server_s *server) {
 	assert(!evhttp_add_header(evhttp_request_get_output_headers(request), _key, _value))
 
 static int _http_preprocess_request(struct evhttp_request *request, server_s *server) {
+	RUN(last_request_ts) = get_now_monotonic();
+
 	if (RUN(auth_token)) {
 		const char *token = evhttp_find_header(evhttp_request_get_input_headers(request), "Authorization");
 
@@ -546,7 +566,7 @@ static void _http_callback_stream(struct evhttp_request *request, void *v_server
 			client->hostport, client->id, RUN(stream_clients_count));
 
 		struct bufferevent *buf_event = evhttp_connection_get_bufferevent(conn);
-		if (server->tcp_nodelay && !RUN(unix_fd)) {
+		if (server->tcp_nodelay && !RUN(ext_fd)) {
 			evutil_socket_t fd;
 			int on = 1;
 
@@ -774,7 +794,21 @@ static void _http_queue_send_stream(server_s *server, bool stream_updated, bool
 	}
 }
 
-static void _http_exposed_refresh(UNUSED int fd, UNUSED short what, void *v_server) {
+static void _http_request_watcher(UNUSED int fd, UNUSED short what, void *v_server) {
+	server_s *server = (server_s *)v_server;
+	const long double now = get_now_monotonic();
+
+	if (stream_has_clients(RUN(stream))) {
+		RUN(last_request_ts) = now;
+	} else if (RUN(last_request_ts) + server->exit_on_no_clients < now) {
+		LOG_INFO("HTTP: No requests or HTTP/sink clients found in last %u seconds, exiting ...",
+			server->exit_on_no_clients);
+		process_suicide();
+		RUN(last_request_ts) = now;
+	}
+}
+
+static void _http_refresher(UNUSED int fd, UNUSED short what, void *v_server) {
 	server_s *server = (server_s *)v_server;
 	bool stream_updated = false;
 	bool frame_updated = false;

src/ustreamer/http/server.h

@@ -71,6 +71,9 @@
 #include "uri.h"
 #include "mime.h"
 #include "static.h"
+#ifdef WITH_SYSTEMD
+#	include "systemd/systemd.h"
+#endif
 
 
 typedef struct stream_client_sx {
@@ -112,11 +115,17 @@ typedef struct {
 typedef struct {
 	struct event_base	*base;
 	struct evhttp		*http;
-	evutil_socket_t		unix_fd;
+	evutil_socket_t		ext_fd; // Unix or socket activation
+
 	char				*auth_token;
-	struct event		*refresh;
+
+	struct event		*request_watcher;
+	long double			last_request_ts;
+
+	struct event		*refresher;
 	stream_s			*stream;
 	exposed_s			*exposed;
+
 	stream_client_s		*stream_clients;
 	unsigned			stream_clients_count;
 } server_runtime_s;
@@ -124,9 +133,15 @@ typedef struct {
 typedef struct server_sx {
 	char		*host;
 	unsigned	port;
+
 	char		*unix_path;
 	bool		unix_rm;
 	mode_t		unix_mode;
+
+#	ifdef WITH_SYSTEMD
+	bool		systemd;
+#	endif
+
 	bool		tcp_nodelay;
 	unsigned	timeout;
 
@@ -140,6 +155,7 @@ typedef struct server_sx {
 	unsigned	fake_height;
 
 	bool		notify_parent;
+	unsigned	exit_on_no_clients;
 
 	server_runtime_s *run;
 } server_s;

src/ustreamer/http/systemd/systemd.c

@@ -0,0 +1,46 @@
+/*****************************************************************************
+#                                                                            #
+#    uStreamer - Lightweight and fast MJPEG-HTTP streamer.                   #
+#                                                                            #
+#    Copyright (C) 2018-2022  Maxim Devaev <mdevaev@gmail.com>               #
+#                                                                            #
+#    This program is free software: you can redistribute it and/or modify    #
+#    it under the terms of the GNU General Public License as published by    #
+#    the Free Software Foundation, either version 3 of the License, or       #
+#    (at your option) any later version.                                     #
+#                                                                            #
+#    This program is distributed in the hope that it will be useful,         #
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of          #
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #
+#    GNU General Public License for more details.                            #
+#                                                                            #
+#    You should have received a copy of the GNU General Public License       #
+#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
+#                                                                            #
+*****************************************************************************/
+
+
+#include "systemd.h"
+
+
+evutil_socket_t evhttp_my_bind_systemd(struct evhttp *http) {
+	int fds = sd_listen_fds(1);
+	if (fds < 1) {
+		LOG_ERROR("No available systemd sockets");
+		return -1;
+	}
+
+	int fd;
+	for (fd = 1; fd < fds; ++fd) {
+		close(SD_LISTEN_FDS_START + fd);
+	}
+	fd = SD_LISTEN_FDS_START;
+
+	assert(!evutil_make_socket_nonblocking(fd));
+
+	if (evhttp_accept_socket(http, fd) < 0) {
+		LOG_PERROR("Can't evhttp_accept_socket() systemd socket");
+		return -1;
+	}
+	return fd;
+}

src/ustreamer/http/systemd/systemd.h

@@ -0,0 +1,37 @@
+/*****************************************************************************
+#                                                                            #
+#    uStreamer - Lightweight and fast MJPEG-HTTP streamer.                   #
+#                                                                            #
+#    Copyright (C) 2018-2022  Maxim Devaev <mdevaev@gmail.com>               #
+#                                                                            #
+#    This program is free software: you can redistribute it and/or modify    #
+#    it under the terms of the GNU General Public License as published by    #
+#    the Free Software Foundation, either version 3 of the License, or       #
+#    (at your option) any later version.                                     #
+#                                                                            #
+#    This program is distributed in the hope that it will be useful,         #
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of          #
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the           #
+#    GNU General Public License for more details.                            #
+#                                                                            #
+#    You should have received a copy of the GNU General Public License       #
+#    along with this program.  If not, see <https://www.gnu.org/licenses/>.  #
+#                                                                            #
+*****************************************************************************/
+
+
+#pragma once
+
+#include <unistd.h>
+#include <assert.h>
+
+#include <event2/http.h>
+#include <event2/util.h>
+
+#include <systemd/sd-daemon.h>
+
+#include "../../../libs/tools.h"
+#include "../../../libs/logging.h"
+
+
+evutil_socket_t evhttp_my_bind_systemd(struct evhttp *http);

src/ustreamer/options.c

@@ -50,6 +50,9 @@ enum _OPT_VALUES {
 	_O_UNIX = 'U',
 	_O_UNIX_RM = 'D',
 	_O_UNIX_MODE = 'M',
+#	ifdef WITH_SYSTEMD
+	_O_SYSTEMD = 'S',
+#	endif
 	_O_DROP_SAME_FRAMES = 'e',
 	_O_FAKE_RESOLUTION = 'R',
 
@@ -109,6 +112,7 @@ enum _OPT_VALUES {
 #	ifdef HAS_PDEATHSIG
 	_O_EXIT_ON_PARENT_DEATH,
 #	endif
+	_O_EXIT_ON_NO_CLIENTS,
 #	ifdef WITH_SETPROCTITLE
 	_O_PROCESS_NAME_PREFIX,
 #	endif
@@ -168,6 +172,9 @@ static const struct option _LONG_OPTS[] = {
 	{"unix",					required_argument,	NULL,	_O_UNIX},
 	{"unix-rm",					no_argument,		NULL,	_O_UNIX_RM},
 	{"unix-mode",				required_argument,	NULL,	_O_UNIX_MODE},
+#	ifdef WITH_SYSTEMD
+	{"systemd",					no_argument,		NULL,	_O_SYSTEMD},
+#	endif
 	{"user",					required_argument,	NULL,	_O_USER},
 	{"passwd",					required_argument,	NULL,	_O_PASSWD},
 	{"static",					required_argument,	NULL,	_O_STATIC},
@@ -203,6 +210,7 @@ static const struct option _LONG_OPTS[] = {
 #	ifdef HAS_PDEATHSIG
 	{"exit-on-parent-death",	no_argument,		NULL,	_O_EXIT_ON_PARENT_DEATH},
 #	endif
+	{"exit-on-no-clients",		required_argument,	NULL,	_O_EXIT_ON_NO_CLIENTS},
 #	ifdef WITH_SETPROCTITLE
 	{"process-name-prefix",		required_argument,	NULL,	_O_PROCESS_NAME_PREFIX},
 #	endif
@@ -419,6 +427,9 @@ int options_parse(options_s *options, device_s *dev, encoder_s *enc, stream_s *s
 			case _O_UNIX:				OPT_SET(server->unix_path, optarg);
 			case _O_UNIX_RM:			OPT_SET(server->unix_rm, true);
 			case _O_UNIX_MODE:			OPT_NUMBER("--unix-mode", server->unix_mode, INT_MIN, INT_MAX, 8);
+#			ifdef WITH_SYSTEMD
+			case _O_SYSTEMD:			OPT_SET(server->systemd, true);
+#			endif
 			case _O_USER:				OPT_SET(server->user, optarg);
 			case _O_PASSWD:				OPT_SET(server->passwd, optarg);
 			case _O_STATIC:				OPT_SET(server->static_path, optarg);
@@ -458,6 +469,7 @@ int options_parse(options_s *options, device_s *dev, encoder_s *enc, stream_s *s
 				};
 				break;
 #			endif
+			case _O_EXIT_ON_NO_CLIENTS:		OPT_NUMBER("--exit-on-no-clients", server->exit_on_no_clients, 0, 86400, 0);
 #			ifdef WITH_SETPROCTITLE
 			case _O_PROCESS_NAME_PREFIX:	OPT_SET(process_name_prefix, optarg);
 #			endif
@@ -551,6 +563,12 @@ static void _features(void) {
 	puts("- WITH_GPIO");
 #	endif
 
+#	ifdef WITH_SYSTEMD
+	puts("+ WITH_SYSTEMD");
+#	else
+	puts("- WITH_SYSTEMD");
+#	endif
+
 #	ifdef WITH_PTHREAD_NP
 	puts("+ WITH_PTHREAD_NP");
 #	else
@@ -652,6 +670,9 @@ static void _help(FILE *fp, device_s *dev, encoder_s *enc, stream_s *stream, ser
 	SAY("    -U|--unix <path>  ─────────── Bind to UNIX domain socket. Default: disabled.\n");
 	SAY("    -D|--unix-rm  ─────────────── Try to remove old UNIX socket file before binding. Default: disabled.\n");
 	SAY("    -M|--unix-mode <mode>  ────── Set UNIX socket file permissions (like 777). Default: disabled.\n");
+#	ifdef WITH_SYSTEMD
+	SAY("    -S|--systemd  ─────────────── Bind to systemd socket for socket activation.\n");
+#	endif
 	SAY("    --user <name>  ────────────── HTTP basic auth user. Default: disabled.\n");
 	SAY("    --passwd <str>  ───────────── HTTP basic auth passwd. Default: empty.\n");
 	SAY("    --static <path> ───────────── Path to dir with static files instead of embedded root index page.");
@@ -661,7 +682,7 @@ static void _help(FILE *fp, device_s *dev, encoder_s *enc, stream_s *stream, ser
 	SAY("                                  the CPU loading. Don't use this option with analog signal sources");
 	SAY("                                  or webcams, it's useless. Default: disabled.\n");
 	SAY("    -R|--fake-resolution <WxH>  ─ Override image resolution for the /state. Default: disabled.\n");
-	SAY("    --tcp-nodelay  ────────────── Set TCP_NODELAY flag to the client /stream socket. Ignored for --unix.");
+	SAY("    --tcp-nodelay  ────────────── Set TCP_NODELAY flag to the client /stream socket. Only for TCP socket.");
 	SAY("                                  Default: disabled.\n");
 	SAY("    --allow-origin <str>  ─────── Set Access-Control-Allow-Origin header. Default: disabled.\n");
 	SAY("    --server-timeout <sec>  ───── Timeout for client connections. Default: %u.\n", server->timeout);
@@ -697,6 +718,8 @@ static void _help(FILE *fp, device_s *dev, encoder_s *enc, stream_s *stream, ser
 #	ifdef HAS_PDEATHSIG
 	SAY("    --exit-on-parent-death  ─────── Exit the program if the parent process is dead. Default: disabled.\n");
 #	endif
+	SAY("    --exit-on-no-clients <sec> ──── Exit the program if there have been no stream or sink clients");
+	SAY("                                    or any HTTP requests in the last N seconds. Default: 0 (disabled)\n");
 #	ifdef WITH_SETPROCTITLE
 	SAY("    --process-name-prefix <str>  ── Set process name prefix which will be displayed in the process list");
 	SAY("                                    like '<str>: ustreamer --blah-blah-blah'. Default: disabled.\n");

src/ustreamer/stream.c

@@ -131,16 +131,7 @@ void stream_loop(stream_s *stream) {
 #			endif
 			if (stream->slowdown) {
 				unsigned slc = 0;
-				while (
+				for (; slc < 10 && !atomic_load(&RUN(stop)) && !stream_has_clients(stream); ++slc) {
-					slc < 10
-					&& !atomic_load(&RUN(stop))
-					&& !atomic_load(&RUN(video->has_clients))
-					// has_clients синков НЕ обновляются в реальном времени
-					&& (stream->sink == NULL || !atomic_load(&stream->sink->has_clients))
-#					ifdef WITH_OMX
-					&& (RUN(h264) == NULL || /*RUN(h264->sink) == NULL ||*/ !atomic_load(&RUN(h264->sink->has_clients)))
-#					endif
-				) {
 					usleep(100000);
 					++slc;
 				}
@@ -252,6 +243,17 @@ void stream_loop_break(stream_s *stream) {
 	atomic_store(&RUN(stop), true);
 }
 
+bool stream_has_clients(stream_s *stream) {
+	return (
+		atomic_load(&RUN(video->has_clients))
+		// has_clients синков НЕ обновляются в реальном времени
+		|| (stream->sink != NULL && atomic_load(&stream->sink->has_clients))
+#		ifdef WITH_OMX
+		|| (RUN(h264) != NULL && /*RUN(h264->sink) == NULL ||*/ atomic_load(&RUN(h264->sink->has_clients)))
+#		endif
+	);
+}
+
 static workers_pool_s *_stream_init_loop(stream_s *stream) {
 
 	workers_pool_s *pool = NULL;

src/ustreamer/stream.h

@@ -97,3 +97,5 @@ void stream_destroy(stream_s *stream);
 
 void stream_loop(stream_s *stream);
 void stream_loop_break(stream_s *stream);
+
+bool stream_has_clients(stream_s *stream);