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