system statistics

[Ali Humaidan]

Hi all,
I'm using Tru64 UNIX 5.1a and I'm trying to write a C program to get the different kind of system statistics such as:
- general server info
- memory usage
- cpu usage
- running processes

can anybody help me to find the C system calls for those info

[Ralf Puchner]

/proc is your friend. Have a look to older forum entries containing a sample reading values.

[Ali Humaidan]

Thanks for your reply but can you be more specific ?
I know how to get these info from linux proc directory, but on unix everything is different, and it seems proc directory contains only process information

[Ralf Puchner]

the information about running processes/memory usage is part of a sample source code posted here in the forum.

[Ali Humaidan]

Thanks Ralf for your reply
I searched the forums again and again with no use
I would really appreciate it if you can give me the direct link for this source code

[Ralf Puchner]

have a look into the attachement. prpsinfo structure is important.

[Arnaud Veron]

why don't you query the tru64 snmp agent ???

[Ali Humaidan]

Thank you Ralf very much for the code, it has helped me in monitoring the process on the system.

But what about physical/swap memory usage and the disk I/O ??? can these information also be found in /proc directory or by communication to the server with SNMP or what ?

[Ralf Puchner]

these information can also be found within /proc and also within snmp.

Information for snmp can be found within the man pages and /usr/share/sysman/mibs.

[Ali Humaidan]

Thanks Ralf Puchner and Arnaud Veron for your positive feedback.

It seems that mibs files contains all the info I need, but I don't know how to intereact with it using SNMP ??

Can anybody direct me to any C source code to intereact with SNMP agent on the server ??? (because I couldn't find any)

[Arnaud Veron · Accepted solution]

You can query the snmp agent with the "snmp_request" tru64 command. example : snmp_request 127.0.0.1 public get 1.3.6.1.2.1.2.2.1.10.2
where :

127.0.0.1 = IP of the host where the snmp agent is running
public = the snmp community you want to query
get = snmp type of method
1.3.6.1.2.1.2.2.1.10.2 = SNMP OID of the metric you're interested in ( you can find OID in the SNMP MIB )

Other OS support SNMP querying :
linux : snmpwalk
windows : getif

good luck.

[Ali Humaidan]

Thanks Arnaud Veron for your reply, now SNMP is clearer to me ... just two questions though:

1. Is there an SNMP system call for snmp_get to read the result from a C program .. or using exec() to invoke snmp_get is the only way.

2. How to query SNMP to view all the groups of a specific branch for example (1.3.6.1.4.1.232.*) .. because MIB files have only a specific branch ie.
--The compaq enterprise (1.3.6.1.4.1.232)
--cpqSystemInfo Group (1.3.6.1.4.1.232.2)
--cpqSiComponent Group (1.3.6.1.4.1.232.2.2)
--cpqSiAsset Group (1.3.6.1.4.1.232.2.2.2)

Thanks again for your help

[Arnaud Veron]

1 - i don't know. But i'm sure you will find what you want here : http://www.netsnmp.org/
you have all the C source of snmp utilities.

2 - you have to use the "getnext" snmp method instead of the "get" one. You also have to tell snmp_request to run into "tree mode", so as to browse the tree you're interested in.
example : snmp_request localhost public getnext -t 1.3.6.1.4.1.232.2.2.2