Beefy Boxes and Bandwidth Generously Provided by pair Networks
"be consistent"
 
PerlMonks  

Re^2: How to find all open STDERR and STDOUT dups?

by tlm (Prior)
on Mar 31, 2009 at 21:24 UTC ( #754542=note: print w/replies, xml ) Need Help??


in reply to Re: How to find all open STDERR and STDOUT dups?
in thread How to find all open STDERR and STDOUT dups?

OK, I figured out why my original lsof experiment failed. I was using the recipe from the Perl Cookbook incorrectly. The following works as expected:

use warnings FATAL => 'all'; no warnings 'once'; use strict; use Parse::RecDescent; close_all_fds(); sub close_all_fds { my @lsof = `/usr/bin/lsof -p $$ 2>/dev/null`; for my $line ( @lsof ) { my @flds = split ' ', $line; next unless $flds[ 3 ] =~ /^(\d+)/; my $fd = $1; my $fh; print "closing $fd\n"; closefd( $fd ); } printf Parse::RecDescent::ERROR "Nya, nya! I'm still open! (BTW, I'm fileno %d)\n", fileno( Parse::RecDescent::ERROR ); } use Inline C => <<EOC; #include <unistd.h> void closefd( int fd ) { if ( close( fd ) ) Perl_croak( aTHX_ "closefd( %d ) failed", fd ); return; } EOC __END__

I still need to figure out how to selectively close those handles that correspond to STDERR and STDOUT, but with the clues++ I got from almut, I think I should be able to do it.

the lowliest monk

Replies are listed 'Best First'.
Re^3: How to find all open STDERR and STDOUT dups?
by BrowserUk (Pope) on Mar 31, 2009 at 22:30 UTC
    I still need to figure out how to selectively close those handles that correspond to STDERR and STDOUT,

    Would it not be sufficient to simple close all open files in your child?

    use POSIX (); ... } else { ## child POSIX::close( $_ ) for 0 .. 255; ## Or higher if that's a possibil +ity ''' }

    Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
    "Science is about questioning the status quo. Questioning authority".
    In the absence of evidence, opinion is indistinguishable from prejudice.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://754542]
help
Chatterbox?
[erix]: nobody knows what kind it takes :)
[erix]: I say his seems a face that launches a thousand missiles :)
[Your Mother]: I say I do. :P
[Your Mother]: Missiles would be an idiotís play. Putin is many things but he is not an idiot.
[erix]: I like the idea of the trumps troup of imbeciles growing slightly nervous now their incompetence will be tested
[erix]: you seem forget there is another idiot coming :)
[Your Mother]: The US government does not attract talent, but grafters and liars and it has been that way for the better part of a century. FEW exceptions.
[erix]: you think it only /looks/ worse this time?
[Your Mother]: HR Clinton was literally threatening Russia. She would have been MUCH more likely to start real trouble.
[Your Mother]: I think there is less decorum this time.

How do I use this? | Other CB clients
Other Users?
Others pondering the Monastery: (8)
As of 2017-01-20 00:59 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Do you watch meteor showers?




    Results (173 votes). Check out past polls.