Fixes for EMNET with non-blocking to handle want read/want write. ZD 18012

Author: dgarske

src/wolfio.c

@@ -153,6 +153,11 @@ static WC_INLINE int TranslateReturnCode(int old, int sd)
         if (errno == RTCSERR_TCP_TIMED_OUT)
             errno = SOCKET_EAGAIN;
     }
+#elif defined(WOLFSSL_EMNET)
+    if (old < 0) { /* SOCKET_ERROR */
+        /* Get the real socket error */
+        IP_SOCK_getsockopt(sd, SOL_SOCKET, SO_ERROR, &old, (int)sizeof(old));
+    }
 #endif
 
     return old;
@@ -166,7 +171,7 @@ static WC_INLINE int wolfSSL_LastError(int err)
     return WSAGetLastError();
 #elif defined(EBSNET)
     return xn_getlasterror();
-#elif defined(WOLFSSL_LINUXKM)
+#elif defined(WOLFSSL_LINUXKM) || defined(WOLFSSL_EMNET)
     return err; /* Return provided error value */
 #elif defined(FUSION_RTOS)
     #include <fclerrno.h>

wolfssl/wolfio.h

@@ -150,6 +150,8 @@
         #include <sys/fcltypes.h>
         #include <fclerrno.h>
         #include <fclfcntl.h>
+    #elif defined(WOLFSSL_EMNET)
+        #include <IP/IP.h>
     #elif !defined(WOLFSSL_NO_SOCK)
         #include <sys/types.h>
         #include <errno.h>
@@ -305,7 +307,7 @@
     #define SOCKET_ECONNREFUSED ERR_CONN
     #define SOCKET_ECONNABORTED ERR_ABRT
 #elif defined(WOLFSSL_EMNET)
-    #include <IP/IP.h>
+    #define XSOCKLENT           int
     #define SOCKET_EWOULDBLOCK  IP_ERR_WOULD_BLOCK
     #define SOCKET_EAGAIN       IP_ERR_WOULD_BLOCK
     #define SOCKET_ECONNRESET   IP_ERR_CONN_RESET