fixed bug #35928 BSD sockets functions must set errno for POSIX-compliance (patch by Mason)

CHANGELOG

@@ -96,6 +96,10 @@ HISTORY
 
  ++ Bugfixes:
 
+  2014-03-11: Simon Goldschmidt (patch by Mason)
+  * opt.h, sockets.c: fixed bug #35928 BSD sockets functions must set errno for
+    POSIX-compliance
+
   2014-02-27: Simon Goldschmidt
   * dhcp.c: fixed bug #40303 DHCP xid renewed when sending a DHCPREQUEST
 

src/api/sockets.c

@@ -223,13 +223,13 @@ static const int err_to_errno_table[] = {
   ((unsigned)(-(err)) < ERR_TO_ERRNO_TABLE_SIZE ? \
     err_to_errno_table[-(err)] : EIO)
 
-#ifdef ERRNO
+#if LWIP_SOCKET_SET_ERRNO
 #ifndef set_errno
 #define set_errno(err) do { if (err) { errno = (err); } } while(0)
 #endif
-#else /* ERRNO */
+#else /* LWIP_SOCKET_SET_ERRNO */
 #define set_errno(err)
-#endif /* ERRNO */
+#endif /* LWIP_SOCKET_SET_ERRNO */
 
 #define sock_set_errno(sk, e) do { \
   sk->err = (e); \

src/include/lwip/opt.h

@@ -1493,6 +1493,13 @@
 #define LWIP_SOCKET                     1
 #endif
 
+/* LWIP_SOCKET_SET_ERRNO==1: Set errno when socket functions cannot complete
+ * successfully, as required by POSIX. Default is POSIX-compliant.
+ */
+#ifndef LWIP_SOCKET_SET_ERRNO
+#define LWIP_SOCKET_SET_ERRNO           1
+#endif
+
 /**
  * LWIP_COMPAT_SOCKETS==1: Enable BSD-style sockets functions names.
  * (only used if you use sockets.c)