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.

include/netinet/tcp.h

@@ -0,0 +1,5 @@
+/*
+netinet/tcp.h
+*/
+
+#define TCP_NODELAY	0x01	/* Avoid coalescing of small segments */

include/sys/socket.h

@@ -26,6 +26,7 @@ sys/socket.h
 #define SO_KEEPALIVE	0x0008
 
 #define SO_SNDBUF	0x1001	/* send buffer size */
+#define SO_RCVBUF	0x1002	/* receive buffer size */
 #define SO_ERROR	0x1007	/* get and clear error status */
 
 /* The how argument to shutdown */