Hi Monks,

I do speak to my kid, but it does not listen ;-( Nothing arrives there.

The problem here is, that what should be send coems once and a while, while the kid should send, what it has got exactly every minute.

So I am forking a kid to sleep until full minute and then I want to read what has come and send it, but the can_read(0) returns always an empty array..

this is the fork and the parent-talk 

   my $pid = open(PIP, "|-");# open to write
   if ( !$pid ) {   # I'm the child
      sendToClient( $SOCKET ); # give the Socket =ok
      exit;
   } else { # I'm parent talking to the kid
      print PIP "Are you there?\n";
      my $n = 0;
      while (1) { # just to test..
         print PIP "hmm, No. ",++$n,"\n"; # kid ??
         print "hmm, No. $n\n"; sleep 1;#control -> ok!
      }

[download]
The Kid executes this 
sub sendToClient {
   my $SOC = ( shift );
   my $HDL = IO::Select->new( \*STDIN );
   while ( $HDL->exists( \*STDIN ) ){ # ok!
      mySleepToFullMinute(); # ok, not the problem
      my @lines = $HDL->can_read( 0 ); # allways empty???
      foreach my $l (@lines) {
         print $SOC $l; # nothing to send??
      }
   }
}

[download]
But @lines is allways empty - why && how to change?
What is my mistake?

Thanks in advance and a nice Subday,
Carl

In reply to forked kid can't read from IO::Select->can_read by Anonymous Monk

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.