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This commit is contained in:
Jim Meyering
2000-11-05 10:12:25 +00:00
parent 2cac22f76f
commit 6d722e99e2
1 changed files with 51 additions and 22 deletions
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lib/tru-knlist-demo.c
+51 -22
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@@ -5,37 +5,66 @@
#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[3];
int retval, i;
nl[0].n_name = (char *)malloc(10);
nl[1].n_name = (char *)malloc(10);
nl[2].n_name = "";
struct nlist nl[2];
int retval;
long offset;
/*******************************************************/
/* Store names of kernel symbols in the nl array */
strcpy (nl[0].n_name, "ncpus");
strcpy (nl[1].n_name, "lockmode");
nl[0].n_name = LDAV_SYMBOL;
nl[1].n_name = "";
/*******************************************************/
/* Call the knlist routine */
retval = knlist(nl);
retval = knlist (nl);
/******************************************************/
/* Display addresses if returned. Otherwise, display */
/* the appropriate error message. */
if (retval < 0)
printf ("No kernel symbol addresses returned.\n");
else
if (retval >= 0 )
for (i=0; i<2; i++)
if (nl[i].n_type == 0)
printf ("Unable to return address of symbol %s\n",
nl[i].n_name);
else
printf ("The address of symbol %s is %lx\n",
nl[i].n_name, nl[i].n_value);
free (nl[0].n_name);
free (nl[1].n_name);
{
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);
}