Hi,
here is my trouble.I writed a server on some port on one
redhat 6.1 to receive a 400k file then save it in local
disk.
always,once had read 13824 bytes from the socket,the job
stopped,no error report.looks like it was suspended forever.
nothing more can be read from the read buffer.
I got several SOL_SOCKET level values:
SO_RCVBUF 65535
SO_SNDBUF 65535
SO_RCVLOWAT 1
SO_SNDLOWAT 1
SO_RCVTIMEO 0
SO_SNDTIMEO 0

my codes below

########################server.pl
#!/usr/bin/perl

$args=@ARGV;
if($args!=2)
{
    print "usage:server.pl [localport] [localfile]\n";
    exit;
}
$port=$ARGV[0];
$file=$ARGV[1];

use IO::Socket;
$skt=IO::Socket::INET->new(LocalAddr=>'0.0.0.0',LocalPort=>$port,Proto
+=>'tcp',Listen=>5)||do{
    print $!."\n";
    exit;
};
$skt->autoflush(1);
print "Ready on port $port ...\n";
$newskt=$skt->accept;
$newskt->sockopt(SO_SNDLOWAT,2048);
$newskt->autoflush(1);
print "client is coming ...\n";
open (FILE,">$file")||die $!;
while($n=sysread($newskt,$buf,2))
{
    $total+=$n;
    print FILE $buf;
    print "received:".$total."\r";
}
close FILE;
$newskt->close();
$skt->close();
print "\nDone.($file)\n";

########################client.pl
#!/usr/bin/perl

$args=@ARGV;
if($args!=3)
{
    print "usage:client.pl [peerhost] [peerport] [localfile]\n";
    exit;
}

$host=$ARGV[0];
$port=$ARGV[1];
$file=$ARGV[2];

use IO::Socket;
$skt=IO::Socket::INET->new(PeerAddr=>$host,PeerPort=>$port,Proto=>'tcp
+')||do{
    print $!."\n";
    exit;
};
print "Begin ...\n";
open (FILE,"$file")||die $!;
binmode FILE;

while($n=read(FILE,$buf,512))
{
    $total+=$n;
    print $skt $buf;
    print "sent:".$total."\r";
}
close FILE;
$skt->close();
print "\nDone.(local $file to remote $host)\n";
[download]

server.pl output:
Ready on port 8888 ...
client is coming ...
received:13824
ok,wait forever here!
What is possible reason of that?kernel restriction?
Thanks for any help in advance.