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Re: [PLUG] BSD total free memory in C ?
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On Wed, Nov 06, 2002 at 09:43:20AM -0500, gabriel rosenkoetter wrote:
> On Wed, Nov 06, 2002 at 08:35:34AM -0500, christophe barbe wrote:
> > To get the total (including free swap) free memory I read /proc/meminfo.
> > I have no knowledge of BSD but IIRC there is no proc filesystem.
>
> Say what?
> grappa:~% uname -a
> NetBSD grappa 1.6F NetBSD 1.6F (GRAPPA) #8: Thu Aug 15 00:54:54 EDT 2002 gr@grappa:/mp3/tmp/netbsd/src/sys/arch/i386/compile/GRAPPA i386
> grappa:~% ls -ld /proc /kern
> dr-xr-xr-x 2 root wheel 512 Nov 6 09:33 /kern/
> dr-xr-xr-x 1 root wheel 512 Nov 6 09:33 /proc/
>
> Long, long ago, BSD systems didn't have /proc because it was a SysV
> thing. But since it's been part of both POSIX and SuS standards for
> quite a while now, any modern BSD system has it.
>
> Note that Linux *way* overloads /proc, keeping *far* more than what
> belongs there there. (The only thing that belongs there is information
> about processes... things like meminfo, cpuinfo, modules, pci,
> iomem, et cetera just don't fit logically.)
Note that it was just ignorance not arogance. Even in linux, the /proc
fs is slightly deprecated. Linus prefers that each driver implement its
own filesystem if really needed. That said I guess you will not find
that better.
> > What would be the BSD way to get the quantity of free memory?
>
> The closest you can get to /proc/meminfo on a (Net)BSD system is
> /kern/physmem, but it's not what you want.
>
> You really want to be doing the same thing that top(whatever,
> probably 1) and vmstat(8) do, though, which is groveling through
> /dev/[k]mem. Check their sources for the details.
Thanks, I will have a look.
> Or, if you're lazy, just shell out a call to vmstat(8), I suppose,
> with the appropriate flags.
No, I prefer avoid that kind of solution.
Christophe
> --
> gabriel rosenkoetter
> gr@eclipsed.net
--
Christophe Barbé <christophe.barbe@ufies.org>
GnuPG FingerPrint: E0F6 FADF 2A5C F072 6AF8 F67A 8F45 2F1E D72C B41E
There is no snooze button on a cat who wants breakfast.
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