How do i get current cpu and memory utilization in linux using the c programming

[nataraju K R_1]

I am writting the snmp agent for one device fo r that i need to send the traps when cpu and memory utilization execded the set thresholds for this i want know how do i get the current cpu and memory utilization using the c programs. If you have any progrmas please forward to me.

Thanks in advance


Thanks and Regards
Nataraju K R

[Ross Minkov]

You can call external commands to get utilization info (say vmstat) from your program, get the output in and parse it.

If you need an snmp agent to monitor cpu and mem util just use net-snmp. Once installed you can set your thresholds in snmpd.conf.

-Ross

[Bill Thorsteinson]

Check the code for uptime, and free.
Both are minimal programs accessing the
appropriate data from the kernel.

[Hein van den Heuvel]

I am sure there are dozens of agents written that already do what you are going to invent, and a lot more, and a lot more secure.
Maybe look at places like: http://net-snmp.sourceforge.net/

Still, of you want to only partially reinvent this wheel, check out sources for sar/top/vmstat.
For example:

http://cvs.sourceforge.net/viewcvs.py/*checkout*/procps/procps/vmstat.c?rev=1.30


fwiw,
Hein.