Date: Sun, 27 Dec 2009 08:28:06 +0000 From: Matthew Seaman <m.seaman@infracaninophile.co.uk> To: Manish Jain <invalid.pointer@gmail.com> Cc: freebsd-questions@freebsd.org Subject: Re: Looking for a convenient way in C to retrieve CPU and memory usage of a process Message-ID: <4B371A96.2020703@infracaninophile.co.uk> In-Reply-To: <4B37117C.3050502@gmail.com> References: <4B37117C.3050502@gmail.com>
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Manish Jain wrote:
> I am looking for a convenient way using C to retrieve the current CPU=20
> and memory utilization of a process of which I have the pid. Can=20
> somebody please give me a hint of which system-calls/library-functions =
> to use for this ? I don't want to use the system() function or grep for=
=20
> information via the /proc filesystem.
>=20
> I would be grateful if you could also please mention whether the=20
> suggested method[s] is/are FreeBSD-specific or would be portable to=20
> other environments like Solaris/Linux ?
Use the source, Luke. In this cse, probably a very good place to start i=
s
with top(1) since it already does a lot of what you want. Start with=20
/usr/src/contrib/top/
This sort of thing generally requires reading /dev/kmem, which is very OS=
dependent. The same sort of approach will probably work on most Unix-oid=
OSes, but the details will be significantly different.
Cheers,
Matthew
--=20
Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard
Flat 3
PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate
Kent, CT11 9PW
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