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Re: UDP Server doesn't receive before newline

by zwon (Monsignor)
on Dec 05, 2012 at 02:17 UTC ( #1007179=note: print w/ replies, xml ) Need Help??


in reply to UDP Server doesn't receive before newline

UDP doesn't have buffering. Buffering happens on the server side -- stdio library buffers output. Try:

print "$datagram\n";


Comment on Re: UDP Server doesn't receive before newline
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Re^2: UDP Server doesn't receive before newline
by nitin1704 (Sexton) on Dec 05, 2012 at 04:25 UTC
    That worked. Thanks! Why doesn't the stdio library buffer output like this when I do a normal print statement (instead of doing it like this in a socket-recv() scenario)?
      Socket is irrelevant. Try:
      perl -e'while(1) { print "Datagram"; sleep 1; }'
      check man stdio for your system. Mine (GNU/Linux) says:
      Output streams that refer to terminal devices are always line buffered by default; pending output to such streams is written automatically whenever an input stream that refers to a terminal device is read. In cases where a large amount of computation is done after printing part of a line on an output terminal, it is necessary to fflush(3) the standard output before going off and computing so that the output will appear.
        Thanks again zwon :)

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