add sd-event support to example «minimal-http-server-eventlib-foreign»

Author: zishfish

minimal-examples/http-server/minimal-http-server-eventlib-foreign/CMakeLists.txt

@@ -72,6 +72,16 @@ if (LWS_WITH_GLIB)
 	set(extralibs ${extralibs} ${GLIB_LIBRARIES})
 	list(APPEND SRCS glib.c)
 endif()
+if (LWS_WITH_SDEVENT)
+	find_path(LIBSYSTEMD_INCLUDE_DIRS NAMES systemd/sd-event.h)
+	find_library(LIBSYSTEMD_LIBRARIES NAMES systemd)
+	message("libsystemd include dir: ${LIBSYSTEMD_INCLUDE_DIRS}")
+	message("libsystemd libraries: ${LIBSYSTEMD_LIBRARIES}")
+	include_directories("${LIBSYSTEMD_INCLUDE_DIRS}")
+	set(extralibs ${extralibs} ${LIBSYSTEMD_LIBRARIES})
+	list(APPEND SRCS libsdevent.c)
+endif()
+
 
 message("Extra libs: ${extralibs}")
 

minimal-examples/http-server/minimal-http-server-eventlib-foreign/README.md

@@ -6,6 +6,7 @@ Commandline option|Meaning
 --uv|Use the libuv event library (lws must have been configured with `-DLWS_WITH_LIBUV=1`)
 --event|Use the libevent library (lws must have been configured with `-DLWS_WITH_LIBEVENT=1`)
 --ev|Use the libev event library (lws must have been configured with `-DLWS_WITH_LIBEV=1`)
+--sd|Use the systemd event library (lws must have been configured with `-DLWS_WITH_SDEVENT=1`)
 
 Notice libevent and libev cannot coexist in the one library.  But all the other combinations are OK.
 

minimal-examples/http-server/minimal-http-server-eventlib-foreign/libsdevent.c

@@ -0,0 +1,85 @@
+/*
+ * lws-minimal-http-server-eventlib-foreign
+ *
+ * Written in 2020 by Christian Fuchs <[email protected]>
+ *
+ * This file is made available under the Creative Commons CC0 1.0
+ * Universal Public Domain Dedication.
+ *
+ * The sdevent specific code
+ */
+
+#include <libwebsockets.h>
+
+#include <string.h>
+#include <signal.h>
+
+#include <systemd/sd-event.h>
+
+#include "private.h"
+
+static struct sd_event *sd_loop;
+
+static sd_event_source *sd_timer;
+static sd_event_source *sd_signal;
+
+static int
+timer_cb_sd(sd_event_source* source,
+            uint64_t now,
+            void* user)
+{
+	foreign_timer_service(sd_loop);
+
+    if (sd_timer) {
+        sd_event_source_set_time(sd_timer, now + 1000000);
+        sd_event_source_set_enabled(sd_timer, SD_EVENT_ON);
+    }
+}
+
+static int
+signal_cb_sd(sd_event_source* source,
+             const struct signalfd_siginfo *si,
+             void* user)
+{
+	signal_cb(si->ssi_signo);
+	return 0;
+}
+
+static void
+foreign_event_loop_init_and_run_libsdevent(void)
+{
+	/* we create and start our "foreign loop" */
+
+	sd_event_default(&sd_loop);
+    sd_event_add_signal(sd_loop, &sd_signal, SIGINT, signal_cb_sd, NULL);
+    uint64_t now;
+    sd_event_now(sd_loop, CLOCK_MONOTONIC, &now);
+    sd_event_add_time(sd_loop, &sd_timer, CLOCK_MONOTONIC, now, (uint64_t) 1000, timer_cb_sd, NULL);
+
+    sd_event_loop(sd_loop);
+}
+
+static void
+foreign_event_loop_stop_libsdevent(void)
+{
+	sd_event_exit(sd_loop, 0);
+}
+
+static void
+foreign_event_loop_cleanup_libsdevent(void)
+{
+    sd_event_source_set_enabled(sd_timer, SD_EVENT_OFF);
+    sd_timer = sd_event_source_unref(sd_timer);
+
+    sd_event_source_set_enabled(sd_signal, SD_EVENT_OFF);
+    sd_signal = sd_event_source_unref(sd_signal);
+
+    sd_loop = sd_event_unref(sd_loop);
+}
+
+const struct ops ops_sdevent = {
+	foreign_event_loop_init_and_run_libsdevent,
+	foreign_event_loop_stop_libsdevent,
+	foreign_event_loop_cleanup_libsdevent
+};
+

minimal-examples/http-server/minimal-http-server-eventlib-foreign/minimal-http-server-eventlib-foreign.c

@@ -196,10 +196,17 @@ int main(int argc, const char **argv)
 					ops = &ops_glib;
 					lwsl_notice("%s: using glib loop\n", __func__);
 				} else
+#endif
+#if defined(LWS_WITH_SDEVENT)
+    if (lws_cmdline_option(argc, argv, "--sd")) {
+					info.options |= LWS_SERVER_OPTION_SDEVENT;
+					ops = &ops_sdevent;
+					lwsl_notice("%s: using sd-event loop\n", __func__);
+				} else
 #endif
 				{
 				lwsl_err("This app only makes sense when used\n");
-				lwsl_err(" with a foreign loop, --uv, --event, --glib, or --ev\n");
+				lwsl_err(" with a foreign loop, --uv, --event, --glib, --ev or --sd\n");
 
 				return 1;
 				}

minimal-examples/http-server/minimal-http-server-eventlib-foreign/private.h

@@ -12,4 +12,4 @@ extern int lifetime, reported;
 void foreign_timer_service(void *foreign_loop);
 void signal_cb(int signum);
 
-extern const struct ops ops_libuv, ops_libevent, ops_glib, ops_libev;
+extern const struct ops ops_libuv, ops_libevent, ops_glib, ops_libev, ops_sdevent;