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From: gorpong@math-cs.kent.edu (Gordon C. Galligher)
Newsgroups: comp.lang.perl
Subject: Perl 3.0 PL28 problems with pipe() cont'd
Message-ID: <1990Sep4.210833.13422@math-cs.kent.edu>
Date: 4 Sep 90 21:08:33 GMT
Organization: Kent State University
Lines: 16

Here is another wierdness in the code.  I changed it slightly to remove the
two pipes, and just the one pipe, had the child close the read and the parent
close the write, and then had the child send first a 25 and then a 250
and then sleep 20 seconds before exiting.  The parent just did a read with
a print, and another read and print.  The parent hung until the child had
died (thus flushing the pipe (even though it was set to be unbuffered by the
child)) and the parent read both numbers in as one "25250".  Is there something
which I am missing terribly?  I really do not understand this behavior and
why it differs so from C.  

Even if I $| = 1 in the parent before closing it, it still does not work.  If
I put the select(DESC1_1); $| = 1; select(STDOUT); before the fork, the
exact same results occur.  Larry, I seek your infinite wisdom in the manner 
of this behavior.

		-- Gordon.