libsystemd: expand with with some common sd-daemon(3) functions

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

libsystemd/sd-daemon.h

@@ -1,6 +1,28 @@
 #ifndef SD_DAEMON_H_
 #define SD_DAEMON_H_
 
+#include <stdint.h>
+#include <sys/types.h>
+
+#define SD_LISTEN_FDS_START 3
+
+/* Basic notification function */
 int sd_notify(int unset_environment, const char *state);
 
+/* Printf-style notification functions */
+int sd_notifyf(int unset_environment, const char *format, ...);
+
+/* PID-specific notification functions */
+int sd_pid_notify(pid_t pid, int unset_environment, const char *state);
+int sd_pid_notifyf(pid_t pid, int unset_environment, const char *format, ...);
+
+/* Socket activation stubs */
+int sd_listen_fds(int unset_environment);
+
+/* Watchdog stub */
+int sd_watchdog_enabled(int unset_environment, uint64_t *usec);
+
+/* System detection */
+int sd_booted(void);
+
 #endif	/* SD_DAEMON_H_ */