Perl 5.001

[p5sagit/p5-mst-13.2.git] / pod / modpods / Open2.pod

diff --git a/pod/modpods/Open2.pod b/pod/modpods/Open2.pod
index 19f0369..942f684 100644 (file)
--- a/pod/modpods/Open2.pod
+++ b/pod/modpods/Open2.pod
@@ -30,4 +30,14 @@ It assumes it's going to talk to something like B<bc>, both writing to
 it and reading from it.  This is presumably safe because you "know"
 that commands like B<bc> will read a line at a time and output a line at
 a time.  Programs like B<sort> that read their entire input stream first,
-however, are quite apt to cause deadlock.  See L<open3> for an alternative.
+however, are quite apt to cause deadlock.  
+
+The big problem with this approach is that if you don't have control 
+over source code being run in the the child process, you can't control what it does 
+with pipe buffering.  Thus you can't just open a pipe to "cat -v" and continually
+read and write a line from it.
+
+=head1 SEE ALSO
+
+See L<open3> for an alternative that handles STDERR as well.
+