Cannot retrieve main memory size using sysmp

[sgitcl]

According to the "Topics in IRIX Programming" manual, it should be fairly easy to determine the amount of physical and free main memory using the sysmp system call.
But when I execute the following simple test program:
#include <stdio.h>

#include <sys/types.h>
#include <sys/sysmp.h>
#include <sys/sysinfo.h>

int main(int argc, char *argv[])
{
int retVal;
struct rminfo rmstruct = { 123 };

retVal = sysmp(MP_KERNADDR, MPSA_RMINFO, &rmstruct);
printf("retVal=%d\n", retVal);
printf("freemem=%d\n",rmstruct.freemem);
printf("availsmem=%d\n",rmstruct.availsmem);
printf("availrmem=%d\n",rmstruct.availrmem);
printf("bufmem=%d\n",rmstruct.bufmem);
printf("physmem=%d\n",rmstruct.physmem);
printf("dchunkpages=%d\n",rmstruct.dchunkpages);
printf("pmapmem=%d\n",rmstruct.pmapmem);
printf("strmem=%d\n",rmstruct.strmem);
printf("chunkpages=%d\n",rmstruct.chunkpages);
printf("dpages=%d\n",rmstruct.dpages);
printf("emptymem=%d\n",rmstruct.emptymem);
printf("ravailrmem=%d\n",rmstruct.ravailrmem);

return 0;
}

I get the following results:
retVal=0
freemem=123
availsmem=0
availrmem=0
bufmem=0
physmem=0
dchunkpages=0
pmapmem=0
strmem=0
chunkpages=0
dpages=0
emptymem=0
ravailrmem=0

The sysmp call succeeds (return value: 0), but all rminfo fields are set to zero with the exception of field freemem, which is left untouched.
Any hints, what is going wrong?

P.S.: Tested on an O2 and a MAME-Indy running IRIX 6.5.22 and gcc 3.4.6.

 

[flexion]

I did not test the sysmp call, but this is how I read memory and swap info in the system load monitor sginet-client:

    struct statfs fs;
    int rc = statfs("/proc/0000000001", &fs, sizeof(struct statfs), 0);
    if (rc == 0) {
        memTotal = (fs.f_blocks * fs.f_bsize) / 1024;
        memAvail = (fs.f_bfree * fs.f_bsize) / 1024;
        memUsed = memTotal - memAvail;
        machine->totalMem = memTotal;
        machine->availableMem = memAvail != 0 ? MINIMUM(memAvail, memTotal) : memAvail;
        machine->usedMem = memUsed;
        // Query swap data
        rc1 = swapctl(SC_GETSWAPMAX, &swapmax);
        rc2 = swapctl(SC_GETFREESWAP, &swapfree);
        if (rc1 + rc2 == 0) {
            machine->totalSwap = (swapmax * 512 / 1024);
            machine->usedSwap = ((swapmax - swapfree) * 512 / 1024);
        }
    }

and in the hinv uploader I use invent.h

#include <invent.h>

inventory_t* iptr;
setinvent();
iptr = getinvent();
while (iptr) {
    if (iptr->class == INV_MEMORY) ....

 

[sgitcl]

Hi flexion,

thanks for the reply.

I just got the sysmp version running by calling it as follows:
sysmp(MP_SAGET, MPSA_RMINFO, &rmstruct, sizeof (rmstruct))

Somebody pointed me to the following program, where it is called in such a way:

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