Notify systemd when mce has started up

If started with --systemd option, mce sends "READY=1" notification
to systemd just before entering mainloop.

[init] Notification sent to systemd when mce has started up

Makefile

@@ -273,6 +273,7 @@ MCE_PKG_NAMES += dbus-1
 MCE_PKG_NAMES += dbus-glib-1
 MCE_PKG_NAMES += gconf-2.0
 MCE_PKG_NAMES += dsme
+MCE_PKG_NAMES += libsystemd-daemon
 
 MCE_PKG_CFLAGS := $(shell $(PKG_CONFIG) --cflags $(MCE_PKG_NAMES))
 MCE_PKG_LDLIBS := $(shell $(PKG_CONFIG) --libs   $(MCE_PKG_NAMES))

mce.c

@@ -134,6 +134,8 @@
 # include "libwakelock.h"
 #endif
 
+#include <systemd/sd-daemon.h>
+
 /** Path to the lockfile */
 #define MCE_LOCKFILE			"/var/run/mce.pid"
 /** Name shown by --help etc. */
@@ -169,6 +171,7 @@ static const char usage_fmt[] =
 "Usage: %s [OPTION]...\n"
 "Mode Control Entity\n"
 "\n"
+"  -n, --systemd              notify systemd when started up\n"
 "  -d, --daemonflag           run MCE as a daemon\n"
 "  -s, --force-syslog         log to syslog even when not daemonized\n"
 "  -T, --force-stderr         log to stderr even when daemonized\n"
@@ -753,10 +756,12 @@ int main(int argc, char **argv)
 	gboolean daemonflag = FALSE;
 	gboolean systembus = TRUE;
 	gboolean debugmode = FALSE;
+	gboolean systemd_notify = FALSE;
 
-	const char optline[] = "dsTSMDqvhVt:";
+	const char optline[] = "dsTSMDqvhVt:n";
 
 	struct option const options[] = {
+		{ "systemd",          no_argument,       0, 'n' },
 		{ "daemonflag",       no_argument,       0, 'd' },
 		{ "force-syslog",     no_argument,       0, 's' },
 		{ "force-stderr",     no_argument,       0, 'T' },
@@ -779,6 +784,10 @@ int main(int argc, char **argv)
 	while ((optc = getopt_long(argc, argv, optline,
 				   options, &opt_index)) != -1) {
 		switch (optc) {
+		case 'n':
+			systemd_notify = TRUE;
+			break;
+
 		case 'd':
 			daemonflag = TRUE;
 			break;
@@ -1015,6 +1024,12 @@ int main(int argc, char **argv)
 	/* MCE startup succeeded */
 	status = EXIT_SUCCESS;
 
+	/* Tell systemd that we have started up */
+	if( systemd_notify ) {
+		mce_log(LL_NOTICE, "notifying systemd");
+		sd_notify(0, "READY=1");
+	}
+
 	/* Run the main loop */
 	g_main_loop_run(mainloop);
 

rpm/mce.spec

@@ -18,6 +18,7 @@ BuildRequires:  pkgconfig(dsme) >= 0.58
 BuildRequires:  pkgconfig(gconf-2.0)
 BuildRequires:  pkgconfig(glib-2.0) >= 2.18.0
 BuildRequires:  pkgconfig(mce) >= 1.12.3
+BuildRequires:  pkgconfig(libsystemd-daemon)
 BuildRequires:  kernel-headers >= 2.6.32
 BuildRequires:  systemd
 # systemd has /etc/rpm/macros.systemd

systemd/mce.service

@@ -8,7 +8,8 @@ After=dsme.service
 # Before=systemd-user-sessions.service
 
 [Service]
-ExecStart=/usr/sbin/mce
+Type=notify
+ExecStart=/usr/sbin/mce --systemd
 Restart=always
 
 [Install]