New errors and defines for socket options.

include/errno.h

@@ -100,6 +100,8 @@ extern int errno;		  /* place where the error numbers go */
 #define EADDRNOTAVAIL (_SIGN 71)  /* Can't assign requested address */
 #define EALREADY      (_SIGN 72)  /* Connection already in progress */
 #define EMSGSIZE      (_SIGN 73)  /* Message too long */
+#define ENOTSOCK      (_SIGN 74)  /* Socket operation on non-socket */
+#define ENOPROTOOPT   (_SIGN 75)  /* Protocol not available */
 
 /* The following are not POSIX errors, but they can still happen. 
  * All of these are generated by the kernel and relate to message passing.