X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fbasic%2Fsocket-util.h;h=8850d9f16e50cdd7adac1bbf84a9bd58dcbc2968;hb=7b6ffe6395e164016636530c2aedaf3f4f9a7830;hp=449273d9a2c3d1ccd55b35797544ec647f55a245;hpb=66ecc207e203db5434610395cd04c40ae8727b58;p=elogind.git

diff --git a/src/basic/socket-util.h b/src/basic/socket-util.h
index 449273d9a..8850d9f16 100644
--- a/src/basic/socket-util.h
+++ b/src/basic/socket-util.h
@@ -143,3 +143,14 @@ int receive_one_fd(int transport_fd, int flags);
 
 #define CMSG_FOREACH(cmsg, mh)                                          \
         for ((cmsg) = CMSG_FIRSTHDR(mh); (cmsg); (cmsg) = CMSG_NXTHDR((mh), (cmsg)))
+
+/* Covers only file system and abstract AF_UNIX socket addresses, but not unnamed socket addresses. */
+#define SOCKADDR_UN_LEN(sa)                                             \
+        ({                                                              \
+                const struct sockaddr_un *_sa = &(sa);                  \
+                assert(_sa->sun_family == AF_UNIX);                     \
+                offsetof(struct sockaddr_un, sun_path) +                \
+                        (_sa->sun_path[0] == 0 ?                        \
+                         1 + strnlen(_sa->sun_path+1, sizeof(_sa->sun_path)-1) : \
+                         strnlen(_sa->sun_path, sizeof(_sa->sun_path))); \
+        })