phys. mem. size
The most efficient methods involve having read access to /dev/kmem.
The following program is available from sun-spots archives. Once
compiled it should have group set to kmem and setgid on execution
if universal access is required. (I hope this isn't a security problem!)
*******************************************************************
/*
* mem.c - print physical memory installed in a machine
*
* $Author: kensmith $
*
* $Date: 90/03/12 14:18:18 $
*
* $Log: mem.c,v $
* Revision 1.2 90/03/12 14:18:18 kensmith
* misc. cleanup
*
* Revision 1.1 90/02/09 21:43:41 kensmith
* Initial revision
*
*/
static char rcsid[] = "$Id: mem.c,v 1.2 90/03/12 14:18:18 kensmith Exp Locker: kensmith $";
#include <stdio.h>
#include <sys/param.h>
#include <sys/types.h>
#include <sys/file.h>
#include <nlist.h>
struct nlist nls[] = {
{ "_physmem" },
#define PHYSMEM 0
{ "" },
};
int fd, physmem;
char *name; /* program name */
char *rindex();
main(argc, argv)
int argc;
char *argv[];
{
if ((name = rindex(argv[0], '/')) == NULL)
name = argv[0];
else
name++;
if (nlist("/vmunix", nls) < 0) {
perror("nlist");
exit(1);
}
if ((fd = open("/dev/kmem", O_RDONLY)) <= 0) {
perror("/dev/kmem");
exit(1);
}
if (nls[PHYSMEM].n_type == 0) {
fprintf(stderr, "%s: physmem symbol not found\n", name);
exit(1);
}
lseek(fd, nls[PHYSMEM].n_value, L_SET);
read(fd, &physmem, sizeof(physmem));
printf("%dK bytes of memory\n", ctob(physmem) / 1024);
}
