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Full Discussion: Trouble with pipes in chat client on linux
Top Forums Programming Trouble with pipes in chat client on linux Post 302718395 by expl on Friday 19th of October 2012 02:14:12 PM
Old 10-19-2012
Well your code is pretty messy, Id sugest you start from 0 with a better design.
There are plenty of uncontrolled stuff happening specially with string buffer handling like so:

Code:
char buf[2] = {0}, message[999] = {0}

...

if((nret = recv(theSocket, message, 999, 0)) < 1)

...

memset(message, 0, strlen(message));

After the recv() call there is no way to make sure that 'message' is a proper 0 terminated string, so strlen() can go outside the buffer size and cause some weird stuff to happen after memset() runs. But this is probably not the major cause of problem for you.

Your client probably is not working because the parent process (childpid != 0) calls exit() before waiting for the child to clean up. If parent exits while child is still running kernel will send SIGINT to your child that will cause premature termination of it. You either need to call wait() function on the child or implement a better design.
Last edited by expl; 10-19-2012 at 03:24 PM.. Reason: typo
 

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LEARN ABOUT DEBIAN

net::hotline::privatechat

Net::Hotline::PrivateChat(3pm)				User Contributed Perl Documentation			    Net::Hotline::PrivateChat(3pm)

NAME

       Net::Hotline::PrivateChat - Private chat object used internally by Net::Hotline::Client

SYNOPSIS

	   use Net::Hotline::PrivateChat;

	   $pchat = new Net::Hotline::PrivateChat;

	   $pchat->subject("Issue 1: Monkey beards");
	   $pchat->reference(0x313337);
	   ...

DESCRIPTION

       Net::Hotline::PrivateChat is a simple class for storing and retrieving private chat information,  You should never have to create your own
       Net::Hotline::PrivateChat objects when using Net::Hotline::Client.  Getting and (to a lesser extent) setting attributes is all that should
       be necessary.

CONSTRUCTION

       new REF, USERLIST, SUBJECT
	   Creates a new Net::Hotline::PrivateChat object with the reference REF, userlist USERLIST, and subject SUBJECT, where REF is a number,
	   USERLIST is a reference to a hash of Net::Hotline::User objects keyed by socket number, and SUBJECT is a string.  Any missing arguments
	   will be set to undef.

METHODS

       All the Net::Hotline::PrivateChat methods are simple attribute get/set routines. If given an argument, they set an attribute.  In all
       cases, they return the current value of the attribute.

       reference NUM
	   The private chat reference number.

       subject TEXT
	   The subject of the private chat.

       userlist HASHREF
	   The list of users in the private chat.

AUTHOR

       John C. Siracusa (siracusa@mindspring.com)

COPYRIGHT

       Copyright(c) 1999 by John Siracusa.  All rights reserved.  This program is free software; you can redistribute it and/or modify it under
       the same terms as Perl itself.

perl v5.10.1							    2002-11-27					    Net::Hotline::PrivateChat(3pm)
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