Hi guys, long time listener first time caller. ;) Anyways, i am writing a "wrapper" that calls other scripts via IPC::Open3. At the moment i am simply testing this wrapper with various test scripts and i came across an unexpected road block. Here is my wrapper code simplified down to the relevant code: 

use IPC::Open3;

my $script = shift;

$|++;

eval {open3(undef, \*OUT, \*ERR, "./$script @ARGV") };
wait();
my $status = $? >> 8;

print "Now executing $script @ARGV";
print "STDOUT:";
print while <OUT>;
print "STERR:";
print while <ERR>;
print "$script finished with status = $status";

close OUT;

[download]
And here is the script that it calls: 
print for 1 .. 1030;

[download]
That's it. Now, if i call the wrapper like so: 
./wrapper.pl some_script.pl

[download]
Then all is well. However (the road block), if i change that number in the script that is called by the wrapper to anything higher than 1030, the wrapper hangs and does not stop. I have to halt execution via CTRL-C. It is as if my wrapper doesn't know what to do when it hits that 4096th byte ... (or 4097th ... i was always off by one ... or two) ...

So my question is, does this happen for you and how can i prevent this lock up? Thanks in advance.

Oh yeah ... just in case ... This is perl, v5.8.0 built for i386-linux-thread-multi

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)

In reply to Script hangs when called via IPC::Open3 by jeffa

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.