logind,machined: expose bus properties for leader PID fd ids, too

src/shared/bus-get-properties.c

@@ -4,6 +4,7 @@
 
 #include "bus-get-properties.h"
 #include "bus-message-util.h"
+#include "pidref.h"
 #include "rlimit-util.h"
 #include "string-util.h"
 
@@ -188,3 +189,23 @@ int bus_property_get_string_set(
 
         return bus_message_append_string_set(reply, *s);
 }
+
+int bus_property_get_pidfdid(
+                sd_bus *bus,
+                const char *path,
+                const char *interface,
+                const char *property,
+                sd_bus_message *reply,
+                void *userdata,
+                sd_bus_error *error) {
+
+        PidRef *pidref = ASSERT_PTR(userdata);
+
+        assert(bus);
+        assert(property);
+        assert(reply);
+
+        (void) pidref_acquire_pidfd_id(pidref);
+
+        return sd_bus_message_append(reply, "t", pidref->fd_id);
+}

src/shared/bus-get-properties.h

@@ -54,6 +54,8 @@ int bus_property_get_rlimit(sd_bus *bus, const char *path, const char *interface
 
 int bus_property_get_string_set(sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error);
 
+int bus_property_get_pidfdid(sd_bus *bus, const char *path, const char *interface, const char *property, sd_bus_message *reply, void *userdata, sd_bus_error *error);
+
 #define BUS_DEFINE_PROPERTY_GET_GLOBAL(function, bus_type, val)         \
         int function(sd_bus *bus,                                       \
                      const char *path,                                  \