+/**
+ * The buffer size of the sun_path component of struct sockaddr_un.
+ *
+ * While glibc doesn't define UNIX_PATH_MAX, it documents it has being limited
+ * to 108 bytes. On NetBSD it is only 104 bytes though. We trust UNIX_PATH_MAX
+ * if it is defined and use the size of the ->sun_path member otherwise. This
+ * should be safe everywhere.
+ */
+#ifndef UNIX_PATH_MAX
+#define UNIX_PATH_MAX (sizeof(((struct sockaddr_un *)0)->sun_path))
+#endif
+