I am trying to have a named pipe with only one line at time. As this named pipe will be read by another program may be a C/C++ program I can't delete before doing that operation.

Below is a sample code which I am trying to put. 

use strict;
use warnings;
use POSIX qw(mkfifo);

my $path = "./test_fifo";

unless ( -p $path) {
    mkfifo($path, 0666) or die "can't mknod fpath: $!";
    warn "$0: created $path as a named pipe\n";
}
while (1) {
    open(FIFO, "+> $path")
        or die "Couldn't open $path for writing: $!\n";
    #truncate(FIFO, 0) or die "Can't reduce size to 0 $!\n";
    print FIFO "The current time is ", scalar(localtime), "\n";
    close FIFO;
    sleep(1);
}

[download]

Any thoughts how to do it.

In reply to How to clear named pipe to just have one line by techman2006

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