use macros ERRNO, SET_ERRNO(), SOCKERRNO and SET_SOCKERRNO() for errno handling

1 files changed, 6 insertions, 1 deletions

diff --git a/lib/inet_pton.c b/lib/inet_pton.c
index 9b9f88b5e..edffeabca 100644
--- a/lib/inet_pton.c
+++ b/lib/inet_pton.c
@@ -66,6 +66,11 @@ static int      inet_pton6(const char *src, unsigned char *dst);
  *      1 if the address was valid for the specified address family
  *      0 if the address wasn't valid (`dst' is untouched in this case)
  *      -1 if some other error occurred (`dst' is untouched in this case, too)
+ * notice:
+ *      On Windows we store the error in the thread errno, not
+ *      in the winsock error code. This is to avoid loosing the
+ *      actual last winsock error. So use macro ERRNO to fetch the
+ *      errno this funtion sets when returning (-1), not SOCKERRNO.
  * author:
  *      Paul Vixie, 1996.
  */
@@ -83,7 +88,7 @@ Curl_inet_pton(int af, const char *src, void *dst)
     return (inet_pton6(src, (unsigned char *)dst));
 #endif
   default:
-    errno = EAFNOSUPPORT;
+    SET_ERRNO(EAFNOSUPPORT);
     return (-1);
   }
   /* NOTREACHED */