Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
Says bluto:
I'm trying to figure out an effective way of timing out shell commands in Perl.
The technique I usually use for this is to make a very small tool called stopafter:
#!/usr/bin/perl # stopafter - run a command with a timeout my $time = shift; alarm($time); exec @ARGV; die "Couldn't exec @ARGV: $!; aborting";
To use stopafter, you say something like this:
stopafter 300 command arg arg...
The command runs, but it dies automatically after 300 seconds.

Now in your Perl program, use:

open FH, "stopafter 10 command |" or die ...;
Now read from the pipe as usual. After 10 seconds, the timer expires and you get an end-of-file condition on the pipe.

Hope this helps.

Mark Dominus
Perl Paraphernalia

In reply to Re: Timing out shell commands (paranoia) by Dominus
in thread Timing out shell commands (paranoia) by bluto

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, 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, 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.
  • Log In?

    What's my password?
    Create A New User
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others pondering the Monastery: (8)
    As of 2015-11-28 13:31 GMT
    Find Nodes?
      Voting Booth?

      What would be the most significant thing to happen if a rope (or wire) tied the Earth and the Moon together?

      Results (742 votes), past polls