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comparison lib/tru-knlist-demo.c @ 2962:08a841b1a567

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*** empty log message ***
author Jim Meyering <jim@meyering.net>
date Sun, 05 Nov 2000 10:12:25 +0000
parents 6f34939d48af
children
comparison
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2961:6f34939d48af 2962:08a841b1a567
3 aka (w/my private hostname compaq-tru64-50a) */ 3 aka (w/my private hostname compaq-tru64-50a) */
4 #include <stdio.h> 4 #include <stdio.h>
5 #include <string.h> 5 #include <string.h>
6 #include <stdlib.h> 6 #include <stdlib.h>
7 #include <nlist.h> 7 #include <nlist.h>
8
9 #ifndef FD_CLOEXEC
10 # define FD_CLOEXEC 1
11 #endif
12
13 #ifndef LDAV_SYMBOL
14 # define LDAV_SYMBOL "_avenrun"
15 #endif
16
17 int
8 main () 18 main ()
9 { 19 {
10 struct nlist nl[3]; 20 struct nlist nl[2];
11 int retval, i; 21 int retval;
12 nl[0].n_name = (char *)malloc(10); 22 long offset;
13 nl[1].n_name = (char *)malloc(10);
14 nl[2].n_name = "";
15 23
16 /*******************************************************/ 24 nl[0].n_name = LDAV_SYMBOL;
17 /* Store names of kernel symbols in the nl array */ 25 nl[1].n_name = "";
18 strcpy (nl[0].n_name, "ncpus");
19 strcpy (nl[1].n_name, "lockmode");
20 26
21 /*******************************************************/ 27 /*******************************************************/
22 /* Call the knlist routine */ 28 /* Call the knlist routine */
23 retval = knlist(nl); 29 retval = knlist (nl);
24 30
25 /******************************************************/ 31 /******************************************************/
26 /* Display addresses if returned. Otherwise, display */ 32 /* Display addresses if returned. Otherwise, display */
27 /* the appropriate error message. */ 33 /* the appropriate error message. */
28 if (retval < 0) 34 if (retval < 0)
29 printf ("No kernel symbol addresses returned.\n"); 35 {
30 else 36 printf ("No kernel symbol addresses returned.\n");
31 if (retval >= 0 ) 37 exit (1);
32 for (i=0; i<2; i++) 38 }
33 if (nl[i].n_type == 0) 39
34 printf ("Unable to return address of symbol %s\n", 40 if (nl[0].n_type == 0)
35 nl[i].n_name); 41 {
36 else 42 printf ("Unable to return address of symbol %s\n", nl[0].n_name);
37 printf ("The address of symbol %s is %lx\n", 43 exit (1);
38 nl[i].n_name, nl[i].n_value); 44 }
39 free (nl[0].n_name); 45
40 free (nl[1].n_name); 46 offset = nl[0].n_value;
47 printf ("The address of symbol %s is %lx\n", nl[0].n_name, offset);
48
49 {
50 double load_ave[3];
51 int channel = open ("/dev/kmem", 0);
52 if (channel < 0)
53 {
54 printf ("open failed\n");
55 exit (1);
56 }
57 #ifdef FD_SETFD
58 (void) fcntl (channel, F_SETFD, FD_CLOEXEC);
59 #endif
60
61 if (lseek (channel, offset, 0) == -1L
62 || read (channel, (char *) load_ave, sizeof (load_ave))
63 != sizeof (load_ave))
64 {
65 close (channel);
66 }
67 }
68
69 exit (0);
41 } 70 }