Hi Folks, I seem to be having a problem doing a simple IPC between a child and a parent process. The child process runs a command and writes the output into a pipe which the parent reads. My program seems to be getting into some sort of a blocking state when i do  @from_pipe = <READX>,but works for  $from_pipe = <READX>. I have this code as an example.Is my program suffering from buffering ?? Thanks !! 
#!/usr/bin/perl
use strict;
use warnings;
use POSIX;
use IO::Handle;

#
pipe (READ,WRITE);
#
sub _Forked {
    my $ip = shift;
    die "Couldn't fork" unless defined (my $pid = fork());
    if ($pid == 0) {
        # CHILD
        my @ping = `ping $ip -w 2 -q | sed -n '\$p'`;
        close (READ);
        select WRITE;
        print "@ping\n";
        close (WRITE);
        #
        exit (0);
    }
    #
    return ($pid);
}
#
sub main {
    my $cpid = _Forked('4.2.2.2');

    my $dpid;
    do {
        $dpid   = POSIX::waitpid(-1,WUNTRACED); 
        my @val = <READ>;
        print "@val\n";
        #
        my $cpid = _Forked('4.2.2.2');
    
    } until ($dpid < 0)
}
main();

[download]

In reply to Reading from a pipe by hello_world

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.