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instead of accepting client connections one at a time and committing yourself to a long-term relationship, take messages from clients as they come in. example 17.2 is a small udp-based server that just sits around waiting for messages. every time a message comes in, we find out who sent it and send them a message based on the previous message, and then save the new message.
we don’t have to say where to send the message because the library keeps track of who sent the last message and stores that information away on the $sock object. you can’t use the telnet program to talk to this server. this time when we create the socket, we supply a peer host and port at the start, allowing us to omit that information in the send . because recv is a blocking system call that may not return, we wrap it in the standard eval block construct for timing out a blocking operation.
example 17.2: udpqotd. #!/usr/bin/perl -w # udpqotd – udp message server use strict; use io::socket; my($sock, example 17-2. udpqotd. #!/usr/bin/perl -w # udpqotd – udp message server use strict; use io::socket; my($sock, example 17.1: clockdrift. #!/usr/bin/perl # clockdrift – compare another system’s clock with this one use strict; use socket; , perl socket, perl socket, perl socket programming, perl recv example, perl echo server.
perl example code for udp client and server; read and write descriptor list using select(io::select). i just want to see a simple udp example, using io::socket. i’m trying to send a single line of data to name. udp_server.pl – simple sample udp echo server. server synopsis. perl udp_server.pl –log_level 3. # default , perl broadcast udp, perl socket timeout, perl socket timeout, perl port, perl io socket http
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