An interface to User Datagram Protocol sockets.
(use udp) (begin (define s (udp-open-socket)) (udp-bind! s #f 0) (udp-connect! s "localhost" 13) ; daytime service (udp-send s "\n") (receive (n data from-host from-port) (udp-recvfrom s 64) (print* n " bytes from " from-host ":" from-port ": " data)) (udp-close-socket s)) ;; Prints the following: ;; 26 bytes from 127.0.0.1:13: Wed Dec 24 11:53:14 2003
Category 5, with several enhancements by Daishi Kato
- (udp-open-socket) procedure
Returns a new UDP socket object.
- (udp-open-socket*) procedure
Returns a new nonblocking UDP socket object.
- (udp-bind! SOCKET HOST PORT) procedure
Binds a UDP socket to an address and port as specified by HOST and PORT. HOST may be a string consisting of an IP address or hostname, or #f, in which case INADDR_ANY is used. If PORT is 0, a port will be allocated by the system automatically.
- (udp-connect! SOCKET HOST PORT) procedure
Connect a socket. In the case of UDP this does nothing more than associate a peer address with the socket in the kernel for use with later calls to send(2). UDP is a connectionless protocol.
- (udp-send SOCKET STRING) procedure
Send the bytes in STRING through SOCKET to its peer, as specified with a previous call to udp-connect!. If the socket is not connected, the system will return an error.
- (udp-sendto SOCKET HOST PORT STRING) procedure
Send the bytes in STRING through SOCKET to PORT on HOST.
- (udp-recv SOCKET LENGTH) procedure
Receive a packet and store the data in string of size LENGTH. Returns two values: the number of bytes received and the string consisting the message.
- (udp-recvfrom SOCKET LENGTH) procedure
Same as udp-recv except that two additional values are returned: the host string and port number from which the packet was received.
- (udp-close-socket SOCKET) procedure
Close a socket.
- (udp-socket? THING) procedure
Test whether THING is a UDP socket.
- (udp-socket-fd THING) procedure
If THING is a UDP socket, returns the file descriptor associated with the socket.
- (udp-bound? SOCKET) procedure
Test whether a UDP socket is bound to a local address and port.
- (udp-connected? SOCKET) procedure
Test whether a peer address and port has been associated with a UDP socket with a call to udp-connect!.
- (udp-bound-port SOCKET) procedure
Returns the port to which the socket is bound.
- (udp-set-multicast-interface SOCKET ADDRESS) procedure
Specify the ADDRESS of the interface to send a multicast packet. This procedure might not be needed if there is only one network interface.
- (udp-join-multicast-group SOCKET ADDRESS GROUP [JOIN]) procedure
Join a multicast GROUP with the interface of the ADDRESSS which can be #f for INADDR_ANY. If the optional argument JOIN is set and #f, the multicast group is dropped.
- 1.18: Added procedure udp-socked-fd [Ivan Raikov, suggested by sethalves]
- 1.14: Ported to Chicken 4
- 1.12: Didn't include signal.h on UNIX [felix]
- 1.11: More Win32 support [Daishi Kato]
- 1.10: Multicast support [Daishi Kato]
- 1.9: Win32 socket-header fun
- 1.8: Hopefully succeeded in actually fixing that cygwin problem (which wasn't a cygwin problem after all, but a broken declaration of ##net#recvfrom)
- 1.7: Fixed cygwin problem [thanks to Daishi Kato]
- 1.6: #includes ws2tcpip.h instead of winsock2.h [Thanks to Graham Fawcett]
- 1.5: Small fix (uses srfi-18 unit, now)
- 1.4: udp-bound-port [Contributed by Daishi Kato]
- 1.3: Yet another bugfix for better Windows support by Daishi Kato
- 1.2: Daishi Kato fixed several bugs
Copyright (c) 2004, Category 5 All rights reserved.
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