I am trying to write a simple, at least what I thought was going to be, TCP client to talk a piece of telco equipment to do provisioning via a CGI frontend(because I am NOT going to be responsible for teaching 20 guys the TL1 command language). In short I am having trouble terminating my read on the socket after I issue commands. I see in alot of the docs to use while(defined($line = <$sock>)) or @lines = <$sock>. Thats doesn't seem to work. I tried using select and that hangs as well. How would I be able to terminate a read fromthe socket when the last line of data comes in? Is there a way to do this without matching a string? I seem to be losing the last characeter in my responses as well, or the last line. The command prompt on this system is a ";" and I never see it in the STDOUT stream but I do see it if I sniff the session. heres the code: 
#!/usr/bin/perl -w

use IO::Socket;
use IO::Select;
use strict;



##INITIALIZE VARS##
my $host = ($ARGV[0] || 'localhost');                 
my $port = ($ARGV[1] || '5501');                 
my $cmd1 = "act-user::dacsmaster:jdv::passwd;\n";         
my $cmd2 = "rtrv-crs-t1::all:jdv;\n";                



##CREATE SOCKET##
my $sock = IO::Socket::INET->new(PeerAddr => "$host",
                PeerPort => "$port",
                Proto    => 'tcp',
                Type     => SOCK_STREAM
                );                 
die "Socket could not be created. Reason: $!\n" unless $sock;    
$sock->autoflush(1);                         



##WRITE TO SOCKET##
my $length = length($cmd1);
syswrite($sock,$cmd1,$length);


##READ FROM SOCKET##
my $read = '';                # Initialise to an empty set
                                # (NOTE: $read=0 is very wrong)
vec($read, fileno($sock), 1) = 1;     # Set the appropriate bit
#vec($read, fileno(FILE2), 1) = 1;     # And for another file...
    

for(;;)
    {
        my $found = select($read, undef, undef, undef);

        print "while loop ran\n";
        # Does FILE1 have data waiting?
        if (vec($read,fileno($sock), 1))
                { 
                   sysread($sock,my $line,1024);
                   print "LINE:"."$line\n";
                }
                else
                {
                    print "nothing to read\n!";
                    last;
                }
    }

print "after for loop\n";



##CLOSE SOCKET AND EXIT##
close($sock) || die "$!";                     
exit;

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In reply to socket reading... by jdv79

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