use strict;
use warnings "all";
use IPC::Open3;
use POSIX;

my $timeout = shift @ARGV;
my ($cpid);

eval{
     local $SIG{ALRM} = sub {die "alarm\n"};
     alarm $timeout;
     #setsid();
     #setpgrp(0,0);
     $cpid = open3("<&STDIN", ">&STDOUT", ">&STDERR", @ARGV) or die $!
+;
     waitpid($cpid, 0);
     alarm 0;
};
if($@){
    die if $@ ne "alarm\n";
    print "timed out\n";
    my $num = kill 15, $cpid;
    print "sent kill to $num\n";
    waitpid($cpid, 0);
}

[download]
Here's output:

$ perl test.pl 2 perl -e 'system("sleep 3; echo My work is done")'
timed out
sent kill to 1
$ My work is done

As you see child child process didn't get killed. If run with kill -15 and setsid uncommened:

> perl test.pl 2 perl -e 'system("sleep 3; echo My work is done")'
timed out
sent kill to 0
My work is done

Please teach me how to kill entire process group spawned by IPC::Open3.  Final goal is to be able to timeout a process, which spawns child (child accepts input from STDIN).

Thanks

In reply to Killing process group run with IPC::Open3 by pm_sanchay

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.