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1 /* Derived from the example in the OSF1 knlist manpage. |
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2 OSF1 spe154.testdrive.compaq.com V5.0 1094 alpha |
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3 aka (w/my private hostname compaq-tru64-50a) */ |
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4 #include <stdio.h> |
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5 #include <string.h> |
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6 #include <stdlib.h> |
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7 #include <nlist.h> |
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8 |
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9 #ifndef FD_CLOEXEC |
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10 # define FD_CLOEXEC 1 |
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11 #endif |
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12 |
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13 #ifndef LDAV_SYMBOL |
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14 # define LDAV_SYMBOL "_avenrun" |
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15 #endif |
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16 |
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17 int |
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18 main () |
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19 { |
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20 struct nlist nl[2]; |
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21 int retval; |
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22 long offset; |
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23 |
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24 nl[0].n_name = LDAV_SYMBOL; |
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25 nl[1].n_name = ""; |
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26 |
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27 /*******************************************************/ |
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28 /* Call the knlist routine */ |
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29 retval = knlist (nl); |
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30 |
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31 /******************************************************/ |
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32 /* Display addresses if returned. Otherwise, display */ |
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33 /* the appropriate error message. */ |
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34 if (retval < 0) |
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35 { |
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36 printf ("No kernel symbol addresses returned.\n"); |
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37 exit (1); |
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38 } |
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39 |
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40 if (nl[0].n_type == 0) |
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41 { |
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42 printf ("Unable to return address of symbol %s\n", nl[0].n_name); |
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43 exit (1); |
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44 } |
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45 |
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46 offset = nl[0].n_value; |
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47 printf ("The address of symbol %s is %lx\n", nl[0].n_name, offset); |
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48 |
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49 { |
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50 double load_ave[3]; |
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51 int channel = open ("/dev/kmem", 0); |
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52 if (channel < 0) |
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53 { |
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54 printf ("open failed\n"); |
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55 exit (1); |
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56 } |
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57 #ifdef FD_SETFD |
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58 (void) fcntl (channel, F_SETFD, FD_CLOEXEC); |
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59 #endif |
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60 |
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61 if (lseek (channel, offset, 0) == -1L |
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62 || read (channel, (char *) load_ave, sizeof (load_ave)) |
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63 != sizeof (load_ave)) |
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64 { |
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65 close (channel); |
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66 } |
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67 } |
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68 |
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69 exit (0); |
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70 } |
