lakka: notify initialize complete to systemd (#18695)

Author: ShigeakiAsai

Makefile.common

@@ -815,6 +815,7 @@ endif
 ifeq ($(HAVE_LAKKA), 1)
    OBJ += network/drivers_wifi/connmanctl.o
    OBJ += misc/cpufreq/cpufreq.o
+   LIBS += -lsystemd
 endif
 
 ifeq ($(HAVE_WIFI), 1)

retroarch.c

@@ -226,6 +226,7 @@
 
 #ifdef HAVE_LAKKA
 #include "lakka.h"
+#include <systemd/sd-daemon.h>
 #endif
 
 #define _PSUPP(var, name, desc) printf("  %s:\n\t\t%s: %s\n", name, desc, var ? "yes" : "no")
@@ -6144,6 +6145,9 @@ int rarch_main(int argc, char *argv[], void *data)
    if (settings->uints.cloud_sync_sync_mode == CLOUD_SYNC_MODE_AUTOMATIC)
       task_push_cloud_sync();
 #endif
+#ifdef HAVE_LAKKA
+   sd_notify(0, "READY=1");
+#endif
 #if !defined(HAVE_MAIN) || defined(HAVE_QT)
    for (;;)
    {