add NO_ADDRESS macro to netdb.h as an alias for NO_DATA

some applications expect it to be defined, despite the standard making
it impossible for it to ever be returned as a value distinct from
NO_DATA. since these macros are outside the scope of the current
standards, no special effort is made to hide NO_ADDRESS under
conditions where the others are exposed.

diff --git a/include/netdb.h b/include/netdb.h
index 2dd799b91af6c4c054e0daf0040acc01d3ac197e..dfc70e2bf28ab495ebe3dd36194f771075e8032a 100644 (file)
--- a/include/netdb.h
+++ b/include/netdb.h
@@ -131,6 +131,7 @@ int *__h_errno_location(void);
 #define TRY_AGAIN      2
 #define NO_RECOVERY    3
 #define NO_DATA        4
+#define NO_ADDRESS     NO_DATA
 #endif
 
 #if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)