Regrettably no. You do have to do that directory call first. This is a race condition that is common on multiuser systems.

The best you can do is either change the kernel to accomodate your desires (you could probably write a module) or you could implement that bit of code in C to reduce the amount of time you linger.

In perl, I would rewrite your code so that you open all the files first, then read from them one by one. In most unices, a file won't 'disappear' until the last file handle is closed.

foreach my $d(readdir(PROC)){
        next if $d !~ /^[0-9]+$/;

        my $procdir = "/proc/$d";
        open($filehandles{$procdir}, "<", $procdir/status") || warn "c
+an't open status with$procdir";
}
foreach my $fh ( keys %filehandles ) {
        while(<$fh>){
            @a = split(/\s+/, $_) if /Uid/;
            $temp[0] = $a[1];
            @b = split(/\s+/, $_) if /VmSize/;
            $temp[1] = $b[1];
        }
close $fh;
}

[download]

____________________
Jeremy
I didn't believe in evil until I dated it.

In reply to Re: fastest way to open a file and stroing it? by jepri
in thread fastest way to open a file and storing it? by snam

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.