Author: ctian Date: Mon Oct 4 08:04:01 2010 New Revision: 568
Log: Documentation string of +max-datagram-packet-size+ added.
Modified: usocket/trunk/usocket.lisp
Modified: usocket/trunk/usocket.lisp ============================================================================== --- usocket/trunk/usocket.lisp (original) +++ usocket/trunk/usocket.lisp Mon Oct 4 08:04:01 2010 @@ -11,7 +11,18 @@ (defparameter *auto-port* 0 "Port number to pass when an auto-assigned port number is wanted.")
-(defconstant +max-datagram-packet-size+ 65507) +(defconstant +max-datagram-packet-size+ 65507 + "The theoretical maximum amount of data in a UDP datagram. + +The IPv4 UDP packets have a 16-bit length constraint, and IP+UDP header has 28-byte. + +IP_MAXPACKET = 65535, /* netinet/ip.h */ +sizeof(struct ip) = 20, /* netinet/ip.h */ +sizeof(struct udphdr) = 8, /* netinet/udp.h */ + +65535 - 20 - 8 = 65507 + +(But for UDP broadcast, the maximum message size is limited by the MTU size of the underlying link)")
(defclass usocket () ((socket