- Larry Campbell added CURLINFO_OS_ERRNO to curl_easy_getinfo() that allows an

app to retrieve the errno variable after a (connect) failure. It will make
  sense to provide this for more failures in a more generic way, but let's
  start like this.

lib/urldata.h

@@ -733,7 +733,7 @@ struct UrlState {
   bool errorbuf; /* Set to TRUE if the error buffer is already filled in.
                     This must be set to FALSE every time _easy_perform() is
                     called. */
-
+  int os_errno;  /* filled in with errno whenever an error occurs */
 #ifdef HAVE_SIGNAL
   /* storage for the previous bag^H^H^HSIGPIPE signal handler :-) */
   void (*prev_signal)(int sig);