+/*
+ Helper call for identifying a passed file descriptor. Returns 1 if
+ the file descriptor is a POSIX Message Queue of the specified name,
+ 0 otherwise. If path is NULL a message queue name check is not
+ done. Returns a negative errno style error code on failure.
+
+ See sd_is_mq(3) for more information.
+*/
+int sd_is_mq(int fd, const char *path);
+#endif // 0
+