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Full Discussion: checking a connection still exists?
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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LEARN ABOUT DEBIAN

fusioninventory::agent::tools::linux

FusionInventory::Agent::Tools::Linux(3pm)		User Contributed Perl Documentation		 FusionInventory::Agent::Tools::Linux(3pm)

NAME

       FusionInventory::Agent::Tools::Linux - Linux generic functions

DESCRIPTION

       This module provides some generic functions for Linux.

FUNCTIONS

   getDevicesFromUdev(%params)
       Returns a list of devices, by parsing udev database.

       Availables parameters:

       logger a logger object

   getDevicesFromHal(%params)
       Returns a list of devices, by parsing lshal output.

       Availables parameters:

       logger a logger object
       command the exact command to use (default: /usr/sbin/lshal)
       file the file to use, as an alternative to the command

   getDevicesFromProc(%params)
       Returns a list of devices, by parsing /proc filesystem.

       Availables parameters:

       logger a logger object

   getCPUsFromProc(%params)
       Returns a list of cpus, by parsing /proc/cpuinfo file

       Availables parameters:

       logger a logger object
       file the file to use (default: /proc/cpuinfo)

   getInfoFromSmartctl(%params)
       Returns some information about a drive, using smartctl.

       Availables parameters:

       logger a logger object
       device the device to use
       file the file to use

   getInterfacesFromIfconfig(%params)
       Returns the list of interfaces, by parsing ifconfig command output.

       Availables parameters:

       logger a logger object
       command the command to use (default: /sbin/ifconfig -a)
       file the file to use

   getInterfacesFromIp(%params)
       Returns the list of interfaces, by parsing ip command output.

       Availables parameters:

       logger a logger object
       command the command to use (default: /sbin/ip addr show)
       file the file to use

perl v5.14.2							    2012-06-25				 FusionInventory::Agent::Tools::Linux(3pm)
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