Perl. Специальный справочник - стр. 329

<FRAME NAME="_display" SCR="chat1.cgi">

<FRAME NAME="_data" SRC="chat2.cgi">

</FRAMESET>

</HTML>

Листинг 21.2. chat1.cgi

#!/usr/lib/perl

use CGI;

use Fcntl;

$co = new CGI;

open (DATA1, "<chat1.dat") or die "Could not open data

file.";

lockfile(DATA1);

$text1 = < DATA1>;

unlockfile(DATA1);

close DATA1;

open (DATA2, "<chat2.dat") or die "Could not open datafile.";

lockfile(DATA2);

$text1 = < DATA2>;

unlockfile(DATA2);

close DATA2;

print

$co->header,

"<meta HTTP-EQUIV=\"refresh\" CONTENT=\"5\">",

$co->start_html(

-title=>'Chat Example',

-author=>'Steve',

-target=>'_display',

Создаем приложение для многопользовательской беседы

-BGCOLOR=>'white',

-LINK=>'red'

),

$co->center($co->h1('Multi-User Chat')),

$co->p,

$co->p,

$co->center($text1),

$co->p,

$co->center($text2),

$co->end_html;

exit;

sub lockfile

{

my $count = 0;

my $handle = shift;

until (flock($handle, 2)) {

sleep .10;

if(++$count > 50) {

print

$co->header,

"<meta HTTP-EQUIV=\"refresh\" CONTENT=\"5\">",

$co->start_html(

-title=>'Chat Example',

-author=>'Steve',

-target=>'_display',

-BGCOLOR=>'white',

-LINK=>'red'

),

$co->center($co->h1('Server too busy')),

$co->end_html;

exit;

}

}

}

sub unlockfile

{

my $handle = shift;

flock($handle, 8);

}

Листинг 21.3. chat2.cgi

#!/usr/lib/perl

use CGI;

use Fcntl;

$co = new CGI;

if($co->param()) {

продолжение И

$name =$co->param('username');

$name =~ s/</&lt/;

$text =$co->param('textarea');

$text =~ s/</&lt/;

if ($text) {

my $oldtext; open (OLDDATA, "<chat2.dat" or die "Could not open

data file."

lockfile(OLDDATA);

$oldtext= <OLDDATA>;

unlockfile(OLDDATA);

close OLDDATA;

open (DATA, "<chat1.dat" or die "Could not open

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