--- libsystemd-dummy-208.orig/src/sd-daemon.h
+++ libsystemd-dummy-208/src/sd-daemon.h
@@ -281,23 +281,23 @@ static inline int sd_listen_fds(int unse
 }
 
 static inline int sd_is_fifo(int fd, const char *path) {
-        return EINVAL;
+        return -EINVAL;
 }
 
 static inline int sd_is_special(int fd, const char *path) {
-        return EINVAL;
+        return -EINVAL;
 }
 
 static inline int sd_is_socket(int fd, int family, int type, int listening) {
-        return EINVAL;
+        return -EINVAL;
 }
 
 static inline int sd_is_socket_inet(int fd, int family, int type, int listening, uint16_t port) {
-        return EINVAL;
+        return -EINVAL;
 }
 
 static inline int sd_is_socket_unix(int fd, int type, int listening, const char *path, size_t length) {
-        return EINVAL;
+        return -EINVAL;
 }
 
 static inline int sd_is_mq(int fd, const char *path) {
