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I would like to either make a shell script or c program that computes the free memory in similar fashion as command free does on linux, for hp-ux.

On hp-ux default installation, only commands that I know which can calculate the free memory are vmstat, or eventually top.

Is there any c api that allows user to calculate all free memory? Or eventually a way to determine all physical memory available on system, then sum all used memory and calculate free PHYS memory?

Petr
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1 Answers1

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I do it with this little program:

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/pstat.h>

int main () {
    struct pst_static pst;
    struct pst_dynamic psd;

    memset(&pst,0,sizeof(struct pst_static));
    pstat_getstatic(&pst, sizeof(pst), (size_t)1, 0);

    memset(&psd,0,sizeof(struct pst_dynamic));
    pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0);

    printf("Total Memory: %lld\n",pst.physical_memory * pst.page_size);
    printf("Free Memory: %lld\n",psd.psd_free * pst.page_size);
}

It outputs the total and the free memory.

See also the HP-UX manual page for pstat.

pitseeker
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