I was debugging (or being humble, trying to seek understanding through following the works left by more experienced people) and when the perl debugger reach the statement

                  ($pid = fork) or last;

[download]

the console showed the message: 
######### Forked, but do not know how to change a TTY. #########
  Define $DB::fork_TTY
       - or a function DB::get_fork_TTY() which will set $DB::fork_TTY
+.
  The value of $DB::fork_TTY should be the name of TTY to use.
  On UNIX-like systems one can get the name of a TTY for the given
   window by typing tty, and disconnect the shell from TTY by
   sleep 1000000.
  DB<4>   DB<4>

[download]

And I found myself lost, because I don't know how to "follow" the child process, nor why the terminal seems so weird, "swallowing" every other char that I type in it.

I don't know if matters, but I am using the PuTTY terminal, through a SSH connection.

So, could anyone help me:
- how do I this mess (the terminal input/output) in right order,
- and continue the debugging, following the child process?

Thanks for all concerns.

In reply to How do I debug/follow child processes? by redbrick

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.