Tim:


Per the perldoc:
http://perldoc.perl.org/CORE.html
... you can globally override CORE::GLOBAL::open with your own function.

It was a bit harder to do than I though though... 

BEGIN {
  *CORE::GLOBAL::open = sub (*;$@) {
    ($package, $filename, $line) = caller();
    print "LOGGING: intercepted `open` call from ( package: '$package'
+, file: '$filename', line: '$line' ) with args: '??', ".join(", ",map
+{ "'$_'" } @_) . "\n";
    if(defined($_[0])) {
      use Symbol qw();
      my $handle = Symbol::qualify($_[0],(caller)[0]);
      no strict 'refs';
      if(@_ == 1) {
        return CORE::open($handle);
      }
      elsif(@_ == 2) {
        return CORE::open($handle, $_[1]);
      }
      else {
        return CORE::open($handle, $_[1], @_[2..$#_]);
      }
    }
    else {
      if(@_ == 1) {
        return CORE::open($_[0]);
      }
      elsif(@_ == 2) {
        return CORE::open($_[0], $_[1]);
      }
      else {
        return CORE::open($_[0], $_[1], @_[2..$#_]);
      }
    }
  };
}

open(my $fh, "<", ".bashrc") or die "unable to use hacked up open func
+tion: $!";
my $top = <$fh>;
print $top;

[download]

Which returns: 
LOGGING: intercepted `open` call from ( package: 'main', file: './core
+over.pl', line: '34' ) with args: '??', '', '<', '.bashrc'
# ~/.bashrc: executed by bash(1) for non-login shells.

[download]
Note: i had done this before, but couldn't quite remember how to make it work with open($fh ..) instead of open(FH ..), so perl.com helped me out:
http://www.perl.com/pub/a/2002/06/11/threads.html?page=2
-- AlexLC

In reply to Re: CORE::GLOBAL::* for auditing which files are read and written? by alexlc
in thread CORE::GLOBAL::* for auditing which files are read and written? by tim.bunce

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.