added support for lwip

ports/atmega328p/GCC/errno.h

@@ -0,0 +1,36 @@
+/* errno.h standard header */
+#ifndef _ERRNO
+#define _ERRNO
+
+
+
+
+/* ERROR CODES */
+#define EDOM    _EDOM
+#define ERANGE  _ERANGE
+#define EFPOS   _EFPOS
+#define EILSEQ  _EILSEQ
+
+               /* lwip error codes, from cygwin errno.h */
+#define EIO 5		      /* I/O error */
+#define EWOULDBLOCK 11          /* Operation would block */
+#define ENOMEM 12	      /* Not enough core */
+#define EFAULT 14	                        /* Bad address */
+#define EINVAL 22	                        /* Invalid argument */
+#define ENOSYS 88                         /* Function not implemented */
+#define ECONNRESET 104            /* Connection reset by peer */
+#define ENOBUFS 105	     /* No buffer space available */
+#define ENOPROTOOPT 109	     /* Protocol not available */
+#define ESHUTDOWN 110	     /* Can't send after socket shutdown */
+#define EADDRINUSE 112	     /* Address already in use */
+#define ECONNABORTED 113     /* Connection aborted */
+#define EHOSTUNREACH 118	     /* Host is unreachable */
+#define ENOTCONN 128	     /* Socket is not connected */
+
+#define _NERR   129   /* one more than last code */
+
+
+
+
+
+#endif