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/* Derived from the example in the OSF1 knlist manpage.
OSF1 spe154.testdrive.compaq.com V5.0 1094 alpha
aka (w/my private hostname compaq-tru64-50a) */
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <nlist.h>
#ifndef FD_CLOEXEC
# define FD_CLOEXEC 1
#endif
#ifndef LDAV_SYMBOL
# define LDAV_SYMBOL "_avenrun"
#endif
int
main ()
{
struct nlist nl[2];
int retval;
long offset;
nl[0].n_name = LDAV_SYMBOL;
nl[1].n_name = "";
/*******************************************************/
/* Call the knlist routine */
retval = knlist (nl);
/******************************************************/
/* Display addresses if returned. Otherwise, display */
/* the appropriate error message. */
if (retval < 0)
{
printf ("No kernel symbol addresses returned.\n");
exit (1);
}
if (nl[0].n_type == 0)
{
printf ("Unable to return address of symbol %s\n", nl[0].n_name);
exit (1);
}
offset = nl[0].n_value;
printf ("The address of symbol %s is %lx\n", nl[0].n_name, offset);
{
double load_ave[3];
int channel = open ("/dev/kmem", 0);
if (channel < 0)
{
printf ("open failed\n");
exit (1);
}
#ifdef FD_SETFD
(void) fcntl (channel, F_SETFD, FD_CLOEXEC);
#endif
if (lseek (channel, offset, 0) == -1L
|| read (channel, (char *) load_ave, sizeof (load_ave))
!= sizeof (load_ave))
{
close (channel);
}
}
exit (0);
}
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