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Special Forums IP Networking checking a connection still exists? Post 302151168 by fishman2001 on Thursday 13th of December 2007 05:51:17 PM
Old 12-13-2007
Bug checking a connection still exists?

Hi I have a bit of c code which I'm trying to use as a relay between apache and a scgi cluster.
Example of problem code is below:

while((n = recv(scgiSock, local_data, MAX_LENGTH, 0)) > 0)
{
time(&t2);
time_now = t2 - t1;
if(time_now > TIMEOUT)
throw 1;
#ifdef UN_NES_DEBUG
logger("scgi : length := ", 1, n);
#endif
logger("sending data: length = ", 1, n);
logger("send ret:= %d", 1, send(receiveSock, local_data, n, 0));
count++;
bzero(local_data, MAX_LENGTH + 1);
sum += n;
logger("Receiving data: current sum = ", 1, sum);
}

I'm encountering a slight but probably easily solveable problem; sometimes apache drops the connection and as a result my program crashes out when trying to send data back on the socket.
Is there any way to check that the socket is still alive before sending data?

Cheers.
Fish.
 

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logger::appender(n)					 Object Oriented logging facility				       logger::appender(n)

__________________________________________________________________________________________________________________________________________________

NAME
logger::appender - Collection of predefined appenders for logger SYNOPSIS
package require Tcl 8.2 package require logger::appender ?1.2? ::logger::appender::console -level level -service service ?options...? ::logger::appender::colorConsole -level level -service service ?options...? _________________________________________________________________ DESCRIPTION
This package provides a predefined set of logger templates. ::logger::appender::console -level level -service service ?options...? -level level Name of the level to fill in as "priority" in the log procedure. -service service Name of the service to fill in as "category" in the log procedure. -appenderArgs appenderArgs Any additional arguments for the log procedure in list form -conversionPattern conversionPattern The log pattern to use (see logger::utils::createLogProc for the allowed substitutions). -procName procName Explicitly set the name of the created procedure. -procNameVar procNameVar Name of the variable to set in the calling context. This variable will contain the name of the procedure. ::logger::appender::colorConsole -level level -service service ?options...? See ::logger::appender::colorConsole for a description of the applicable options. BUGS, IDEAS, FEEDBACK This document, and the package it describes, will undoubtedly contain bugs and other problems. Please report such in the category logger of the Tcllib SF Trackers [http://sourceforge.net/tracker/?group_id=12883]. Please also report any ideas for enhancements you may have for either package and/or documentation. KEYWORDS
appender, logger COPYRIGHT
Copyright (c) 2005 Aamer Akhter <aakhter@cisco.com> log 1.2 logger::appender(n)
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