Do not use on any
shared computer
May 13, 2008 08:56am pdt
07.17.1997 at 08:44AM PDT, ID: 10017568
[x]
Attachment Details
[x]
The Solution Rating System

With so many solutions, how can you tell which solutions are most likely to help you and which ones are not? To provide you with a tool to use, we rate our solutions based on various elements that most accurately determine if a solution is a quality solution. To explain what factors affect the solution rating, here are the elements we take into consideration when formulating our solution rating.

  • The Grade of the Solution
  • The Zone Rank of the Expert Providing the Solution
  • The Number of Author and Expert Comments
  • The Number of Experts Contributing
  • The Feedback of the Community

Your Input Matters
Because of the way the system is set up, the most important variable in this equation is you. As a member of Experts Exchange, you are able to cast your vote on the quality of the solutions in regard to how complete, accurate, helpful and easy to understand each solution is. When you provide your feedback, each rating is adjusted accordingly. So, if you see a solution that has a poor rating that you think is a good solution, let us know by rating it. As you do, the rating will be adjusted and will become more accurate for other members of our site.

If you have any suggestions that you would like to make for our rating system, please ask a question in the Suggestions Zone of Community Support.

Thank you!

NEED HELP! - streaming text for cgi web chat
Tags: cgi, streaming, text
Ok, PERL gurus! I am working on a project to allow streaming(scrolling) text for a cgi chat server in a
multi-framed HTML document. I have seen several client / server models and sample code, but cannot seem to get it straight. The problem I see with many of the
sample daemons is that they create way too much server
load. ex. The have to spawn a child process to
communicate with a newly opened socket. I need a
server to accept incoming sockets and to print messages
recieved from a socket to all other open connections
from ONE process(I guess this would be similar to the
innd process). I will be INCREDIBLY grateful for some
advice as this is an extremely important feature for me to
add. Thank you very much.


------ Text Omitted .... Code needing fixed is listed below


I feel the code is almost there, but it has bugs in it. I've set the server to listen on a particular port. Rather then writing the client, I've just telneted in to test the
response. Once the socket is opened, I type in data(then of course the steam will be ended via a \n) and the data is sent back to my socket and it is then closed. For some
reason the text is not being broadcasted to other open connections. I'd really appreciate further help if it is possible. Also, once completed this version should be
able to support up to and even beyond 50 - 100 simultaneous users. Is this feasable with this implementation. Here is my code so far. Also The cgi web-based interface will be in a
3 frame window.  The upper left frame will recieve all new
text written by other chatters.  The lower frame will allow the user to add new text, which will in turn be sent to the upper right frame.  The third frame will be used for customizable options.
Thank you greatly! - Eric

               #!/usr/bin/perl
                 
               ($port) = @ARGV;
               $port = 2345 unless $port;
                 
               $AF_INET = 2;
               $SOCK_STREAM = 1;
                 
               $sockaddr = 'S n a4 x8';
                 
               ($name, $aliases, $proto) = getprotobyname('tcp');
               if ($port !~ /^\d+$/) {
                   ($name, $aliases, $port) = getservbyport($port, 'tcp');
               }
                 
               print "Port = $port\n";
               $this = pack($sockaddr, $AF_INET, $port, "\0\0\0\0");
                 
               socket(LISTEN, $AF_INET, $SOCK_STREAM, $proto) || die "socket: $!";
               bind(LISTEN,$this) || die "bind: $!";
               listen(LISTEN,5) || die "connect: $!";
                 
               select(LISTEN); $| = 1; select(stdout);
                 
               print "Listening for connections....\n";
                 
               while (1) {
                   # each time, create the select bit array
                   $bits = 0;
                   for (@CLIENTS) {
                   vec ($bits, fileno ($_), 1) = 1;
                   }
                   vec ($bits, fileno (LISTEN), 1) = 1;
                 
                   #OK, wait until something comes in.
                   $nfound = select($rbits=$bits,undef,$ebits=$bits,undef);
                 
                   #OK, something woke us up.
                   # see if it is a new connection...
                   if (vec($rbits, fileno(LISTEN), 1)) {
                   # new connection
                   accept (NS, LISTEN);
                   push (@CLIENTS, NS); }
                 
                   #no, try the clients
                   $incoming = undef;
                   for (@CLIENTS) {
                   if (vec ($rbits, fileno ($_), 1)) {
                   #OK, this client's got something, read a line...
                   $incoming .= <$_>; } }
                 
                   # next, send $incoming to all clients...
                   if ($incoming) {
                   for (@CLIENTS) {
                   print $_ "$incoming\n"; } }
                   }
Start your free trial to view this solution
Question Stats
Zone: Programming
Question Asked By: knight76
Solution Provided By: ozo
Participating Experts: 1
Solution Grade: C
Views: 5
Translate:
Loading Advertisement...
08.28.1997 at 08:29PM PDT, ID: 1204925

Rank: Genius

All comments and solutions are available to Premium Service Members only.

Start your 7 day free trial and see for yourself why Experts Exchange is the easiest and most proven technology resource in the world. Get Started

Already a member? Login to view this solution.

 
08.28.1997 at 08:41PM PDT, ID: 1204926

Rank: Genius

All comments and solutions are available to Premium Service Members only.

Start your 7 day free trial and see for yourself why Experts Exchange is the easiest and most proven technology resource in the world. Get Started

Already a member? Login to view this solution.

 
 
Loading Advertisement...
Microsoft
  • Internet Protocols
  • Applications
  • Development
  • OS
  • Hardware
  • Windows Security
Apple
  • Operating Systems
  • Hardware
  • Programming
  • Networking
  • Software
Internet
  • Search Engines
  • File Sharing
  • WebTrends / Stats
  • Spy / Ad Blockers
  • Web Browsers
  • New Net Users
  • Web Development
  • Chat / IM
  • Anti Spam
  • Web Servers
  • Anti-Virus
  • Email Clients
Gamers
  • Tips
  • Online / MMORPG
  • Puzzle
  • Emulators
  • Action / Adventure
  • Role Playing
  • Consoles
  • Game Programming
  • Strategy
  • Sports
  • Misc
  • Computer Games
Digital Living
  • Hardware
  • New Net Users
  • New Users
  • Software
  • Digital Music
  • Gaming World
  • Home Security
  • Apple
  • Networking Hardware
Virus & Spyware
  • Vulnerabilities
  • IDS
  • Encryption
  • Anti-Virus
  • Operating Systems Security
  • Software Firewalls
  • WebApplications
  • Cell Phones
  • Operating Systems
  • Internet
  • Hardware Firewalls
Hardware
  • Handhelds / PDAs
  • Displays / Monitors
  • Components
  • Networking Hardware
  • Peripherals
  • Laptops/Notebooks
  • Storage
  • Servers
  • Desktops
  • New Users
  • Misc
  • Apple
Software
  • System Utilities
  • Industry Specific
  • Network Management
  • Photos / Graphics
  • Page Layout
  • VMWare
  • Misc
  • Web Development
  • OS
  • CYGWIN
  • Voice Recognition
  • Message Queue
  • Quality Assurance
  • Security
  • Firewalls
  • MultiMedia Applications
  • Development
  • Database
  • Office / Productivity
  • Business Management
  • OS/2 Apps
  • Server Software
  • Internet / Email
ITPro
  • OS
  • Storage
  • Encryption
  • Operating Systems Security
  • Apple Hardware
  • Laptops & Notebooks
  • Servers
  • Networking Hardware
  • Peripherals
  • Devices
  • Displays / Monitors
  • WebTrends / Stats
  • Search Engines
  • Firewalls
  • WebApplications
  • IDS
  • Vulnerabilities
  • Email Clients
  • File Sharing
  • Spy / Ad Blockers
  • Web Browsers
  • Web Servers
  • Networking
  • Anti-Virus
  • Chat / IM
  • Anti Spam
Developer
  • Web Servers
  • Web Browsers
  • Game Programming
  • Dev Tools
  • Industry Specific
  • Office / Productivity
  • Database
  • CYGWIN
  • Web Development
  • Search Engines
  • File Sharing
  • WebTrends / Stats
  • Programming
  • Content Management
  • Application Servers
  • Protocols
Storage
  • Removable Backup Media
  • Storage Technology
  • Servers
  • Grid
  • Remote Access
  • Backup / Restore
  • Misc
  • Hard Drives
OS
  • Miscellaneous
  • Security
  • Development
  • Linux
  • VMWare
  • MainFrame OS
  • Unix
  • Apple
  • OS / 2
  • AS / 400
  • BeOS
  • Microsoft
  • VMS / OpenVMS
Database
  • Oracle
  • Miscellaneous
  • MySQL
  • Software
  • Sybase
  • Contact Management
  • PostgreSQL
  • Data Manipulation
  • Clarion
  • InterSystems Cache
  • Siebel
  • MUMPS
  • OLAP
  • SQLBase
  • SAS
  • GIS & GPS
  • 4GL
  • Berkeley DB
  • DB2
  • Informix
  • Interbase / Firebird
  • FoxPro
  • Reporting
  • LDAP
  • Filemaker Pro
  • MS SQL Server
  • dBase
  • MS Access
Security
  • Misc
  • Web Browsers
  • Software Firewalls
  • Operating Systems Security
  • File Sharing
  • Spy / Ad Blockers
  • Vulnerabilities
  • WebApplications
  • IDS
  • Anti-Virus
  • Encryption
  • Anti Spam
  • Email Clients
  • VPN
  • Chat / IM
Programming
  • Editors IDEs
  • Installation
  • Handhelds / PDAs
  • Multimedia Programming
  • System / Kernel
  • Algorithms
  • Game
  • Signal Processing
  • Project Management
  • Open Source
  • Database
  • Misc
  • Languages
  • Processor Platforms
  • Theory
Web Development
  • Scripting
  • Blogs
  • Web Servers
  • Software
  • Search Engines
  • Web Graphics
  • Images
  • Internet Marketing
  • Images and Photos
  • Components
  • Document Imaging
  • Web Languages/Standards
  • Illustration
  • WebApplications
  • Fonts
  • WebTrends / Stats
  • Authoring
  • Digital Camera Software
  • Miscellaneous
Networking
  • Protocols
  • Apple Networking
  • Network Management
  • Message Queue
  • Application Servers
  • Content Management
  • File Servers
  • Email Servers
  • Misc
  • Java Editors & IDEs
  • Wireless
  • Networking Hardware
  • Backup / Restore
  • System Utilities
  • ISPs & Hosting
  • Web Servers
  • Storage Technology
  • Removable Backup Media
  • Servers
  • Broadband
  • Grid
  • OS / 2
  • Novell Netware
  • Unix Networking
  • Windows Networking
  • Security
  • Telecommunications
  • Operating Systems
  • Linux Networking
Other
  • Community Advisor
  • Lounge
  • Community Support
  • New Net Users
  • Philosophy / Religion
  • Math / Science
  • Miscellaneous
  • URLs
  • Expert Lounge
  • Politics
  • Puzzles / Riddles
Community Support
  • Suggestions
  • New to EE
  • New Topics
  • Community Advisor
  • CleanUp
  • Announcements
  • General
  • Feedback
  • Input
  • EE Bugs
 
08.28.1997 at 08:29PM PDT, ID: 1204925

Rank: Genius

Using the -w flag says:
Unquoted string "stdout" may clash with future reserved word at line 24.
Name "main::ebits" used only once: possible typo at line 37.
Name "main::NS" used only once: possible typo at line 43.
Name "main::nfound" used only once: possible typo at line 37.

 
 
08.28.1997 at 08:41PM PDT, ID: 1204926

Rank: Genius

Perhaps more tellingly,
use strict;
gives the error
Bareword "NS" not allowed while "strict subs" in use at line 45.

Could it be that
      push (@CLIENTS, *NS);
was what you meant?

Accepted Solution
 
 
20080206-EE-VQP-25