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Re^2: Problem with IO::Select

by timos (Beadle)
on Mar 01, 2007 at 00:11 UTC ( [id://602625]=note: print w/replies, xml ) Need Help??

in reply to Re: Problem with IO::Select
in thread Problem with IO::Select

You are right of course. But this does not fix my problem. The results are the same with
while (length($rx_txt) > 0) { $sock->recv($rx_txt, 1024); $buff.=$rx_txt; }
But I have to admit I am a little bit ashamed of myself now. :-)

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Re^3: Problem with IO::Select
by Thelonius (Priest) on Mar 01, 2007 at 00:36 UTC
    You still aren't reading anything. length(undef) is certainly not greater than 0.

    Also, $sock is not the right socket to be reading from anyway.

      Ah, ok. So I changed it to
      my $rx_txt = "something"; while (length($rx_txt) > 0) { $conn->recv($rx_txt, 1024); $buff.=$rx_txt; }
      But the problem stays the same.
        You probably meant to write:
        while ($rh->recv($rx_txt, 1024) > 0) { $buff .= $rx_txt; }
        But that's not good code when using 'select'. That's only okay if you're only handling one connection at a time. If you're only handling one connection at a time, don't use select.

        Also, I hope you know that adding a file handle for "~/.somefile" only makes sense if it's a fifo (named pipe).

        There are actually a lot of problems with your code. You should probably look at something somebody else has written. I recommend The Perl Cookbook, although there are a lot of free examples scattered about the internet.

        "can_read" really means "trying to read won't block", which means that end-of-file will cause can_read to keep returning "true" forever. That might be your problem.

        You need to detect end-of-file and then (probably) close the socket and stop asking if you can read from it.

        - tye        

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