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How to write code for a Logging Event?

 
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# 1  
Old 12-04-2011
How to write code for a Logging Event?
How do I know what parts of the application to monitor and what means do I use to get this data? Can I use proc? What interactions are important and how do I view them?I would be more descriptive but I have not a clue.

Thanks in advance!Smilie
# 2  
Old 12-04-2011
Here is some information on how to use /proc to look at a process:

Exploring procfs LG #115

Not sure if this helps, but post some more specifics on what you need.
This User Gave Thanks to dude2cool For This Post:
theKbStockpiler
# 3  
Old 12-04-2011
wat kind if logging events are u looking for? i just perfected a logwatch to monitor everything in /var/log/* n it emails u daily reports (if u have sendmail already setup)

have a look at the link below if that helps...

https://www.unix.com/suse/171792-last-login-log.html
Last edited by hedkandi; 12-05-2011 at 09:50 AM.. Reason: typo
This User Gave Thanks to hedkandi For This Post:
theKbStockpiler
# 4  
Old 12-05-2011
Thanks for the Replies!
I'm looking for the ins and outs of how Logging Events are created. I have read that with applications logs,the programmer writes code that creates the data that is sent to a separate log application. How do I go about coding events? What events are important? What tools do I use to monitor the running application? Smilie
# 5  
Old 12-05-2011
hmm u sound very confused. from my understanding usually almost all appcomes with their ownn logging. all the logs in /var/log/* are important. if u want to know how these logs are set, check /etc/logrotate.d/*

almost a the logs there are all important

i doubt u will get much gelp unless u provide some detailed info

Smilie
# 6  
Old 12-05-2011
When a programmer writes an application, they include code that generates data so it can be sent to the log files to help determine why the application crashed or hung.
# 7  
Old 12-05-2011
Still think you're overthinking this. It can be as simple as using stdout and stderr:

Code:
printf("handling event...\n"); //stdout

if(error)
{
        fprintf(stderr, "Something we couldn't fix happened!  Error %d\n", 32); // stderr
        exit(1);
}

Code:
./myapplication > /path/to/access.log 2> /path/to/error.log

Or if you want you can use syslog (see man 3 syslog) :

Code:
#include <syslog.h>
#include <stdarg.h>


...

openlog("myprogram", LOG_PID, LOG_DAEMON);

...

syslog(LOG_DEBUG, "Hello, something happened!  Error %d", 32);
exit(1);

Though you can no longer control what file it goes into from your appplication, that's up to the system logger.
 
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