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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


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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.

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