Hi guys!

I use the following code for executing a script with timeout on it:
eval {
     alarm($timeout);

     pipe(READ,WRITE);
     if ($pid = fork)  {
        $SIG{CHLD} = sub { $exitStatus = $? while (waitpid(-1, WNOHANG
+)) > 0 };
        close(WRITE);
     }
     else  {
        die "Cannot fork: $!" unless defined $pid;
        open(STDOUT, ">&=WRITE") or die "Cannot redirect STDOUT: $!";
        close(READ);
        exec ("$extScript") or die "Cannot exec $extScript: $!";
     }
     while(<READ>)  {
     push(@output, $_);  }

     close(READ);
     alarm(0);

};  ## End eval

if ($@)  {
   if ($@ =~ /Timeout/)  {
     print "Reached timeout\n";
   } else {
     alarm(0);
     die;
   }
} else {
  print Dumper(\@output);
}

[download]
the above code is wrraped into a function and called with two parameters: script and timeout.
my problem is that i get the following message when calling the function:

Argument "WNOHANG" isn't numeric in waitpid at /../../prog.pl

and the program gets stuck.
can anyone help?


Hotshot

In reply to WNOHANG uninitialized? by hotshot

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.