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This is just a wild a*s guess, but it sounds familiar to the problem of making a bidirectional socket client. The idea is to fork ( or thread ) off the input from the output. The code below is for sockets, but you should be able to figure out how to open your DEVICE handle and read/write to it instead. Also, you might need to open DEVICE read/write, i.e. '+<'
#!/usr/bin/perl -w use strict; # remove the socket code, and insert your # DEVICE open ############################# use IO::Socket; my ( $host, $port, $kidpid, $handle, $line ); ( $host, $port ) = ('localhost',1200); my $name = shift || ''; if($name eq ''){print "What's your name?\n"} chomp ($name = <>); # create a tcp connection to the specified host and port $handle = IO::Socket::INET->new( Proto => "tcp", PeerAddr => $host, PeerPort => $port ) or die "can't connect to port $port on $host: $!"; $handle->autoflush(1); # so output gets there right away print STDERR "[Connected to $host:$port]\n"; ############################ # here is the essence of what I'm proposing to try # split the program into two processes, identical twins die "can't fork: $!" unless defined( $kidpid = fork() ); # the if{} block runs only in the parent process if ($kidpid) { # copy the socket to standard output while ( defined( $line = <$handle> ) ) { print STDOUT $line; } kill( "TERM", $kidpid ); # send SIGTERM to child } # the else{} block runs only in the child process else { # copy standard input to the socket while ( defined( $line = <STDIN> ) ) { print $handle "$name->$line"; } }

I'm not really a human, but I play one on earth.
Old Perl Programmer Haiku ................... flash japh

In reply to Re: stupid serial port issue by zentara
in thread stupid serial port issue by mlibhart

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