Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
When you try to access the contents of a specific memory address, the only thing that can happen is a segmentation fault. I experimented with this:
#!/usr/bin/perl BEGIN { $| = 1; $^W = 1; } use strict; use autodie; use warnings FATAL => 'syntax'; use Data::Dumper::Concise; use POSIX; use POSIX::RT::Signal qw/sigwaitinfo sigqueue/; use threads; use Scalar::Util qw/refaddr/; use Devel::Pointer::PP; POSIX::sigprocmask( POSIX::SIG_BLOCK, POSIX::SigSet->new(&POSIX::SIGRT +MIN) ); my $thr = threads->create( \&_thread ); sub _thread { my $sigset = POSIX::SigSet->new(&POSIX::SIGRTMIN); my $info = sigwaitinfo($sigset); } my $address = 5; refaddr( \$address ); my $new_address = \$address; $$new_address = $$new_address * 4; sigqueue( $$, &POSIX::SIGRTMIN, $address ); $thr->join(); print Dumper($address); my $smash = unsmash_sv( 0 + $address ); print Dumper($smash); exit(0);

In reply to Re: How to access the contents of a specific memory address? by Khen1950fx
in thread How to access the contents of a specific memory address? by pat_mc

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
    [Discipulus]: good morning nuns and monks!

    How do I use this? | Other CB clients
    Other Users?
    Others about the Monastery: (6)
    As of 2018-06-25 07:10 GMT
    Find Nodes?
      Voting Booth?
      Should cpanminus be part of the standard Perl release?

      Results (126 votes). Check out past polls.