Call for testers: libiberty/physmem.c

[Krzysztof Parzyszek]

On Fri, Feb 21, 2003 at 12:00:15PM -0500, Kaveh R. Ghazi wrote:
>  > From: Krzysztof Parzyszek <kparz@iastate.edu>
>  > 
>  > On FreeBSD 4.8-PRERELEASE it doesn't work (prints zeros).  FreeBSD
>  > doesn't provide physical memory information via sysconf, you can use
>  > sysctl instead.
>  > Krzysztof
> 
> How exactly?  Thanks.

Here is a sample code that works on FreeBSD-STABLE.  The values returned
by sysctl are said to be in bytes and so I don't know what happens when
you have >= 2G of available memory.

If you want to check out manual pages for sysctl(3) for various *BSD
systems, you can find them on http://www.freebsd.org/docs.html#man

Krzysztof



#include <stdio.h>
#include <sys/types.h>
#include <sys/sysctl.h>

int main() {
    int mib[2];
    int physmem, usermem, pagesize;
    size_t len;

    mib[0] = CTL_HW;

    mib[1] = HW_PHYSMEM;
    len = sizeof(int);
    if (sysctl(mib, 2, &physmem, &len, NULL, 0) != 0) perror("sysctl");

    mib[1] = HW_USERMEM;
    len = sizeof(int);
    if (sysctl(mib, 2, &usermem, &len, NULL, 0) != 0) perror("sysctl");

    mib[1] = HW_PAGESIZE;
    len = sizeof(int);
    if (sysctl(mib, 2, &pagesize, &len, NULL, 0) != 0) perror("sysctl");

    printf("physmem = %d bytes\nusermem = %d bytes\npagesize = %d bytes\n",
        physmem, usermem, pagesize);

}