fixed bug #39882 No function shall set errno to 0

CHANGELOG

@@ -96,6 +96,9 @@ HISTORY
 
  ++ Bugfixes:
 
+  2014-02-20: Simon Goldschmidt
+  * sockets.c: fixed bug #39882 No function shall set errno to 0
+
   2014-02-20: Simon Goldschmidt
   * mib_structs.c: fixed bug #40050 SNMP problem with MIB arrays > 255
 

src/api/sockets.c

@@ -225,7 +225,7 @@ static const int err_to_errno_table[] = {
 
 #ifdef ERRNO
 #ifndef set_errno
-#define set_errno(err) errno = (err)
+#define set_errno(err) do { if (err) { errno = (err); } } while(0)
 #endif
 #else /* ERRNO */
 #define set_errno(err)