用程式去控制/etc/inittab電源..,關機和取消.(不知是否可加精)

河边星星

# UPS connected and working correctly.
pf::powerfail:/sbin/shutdown -f -h +30 "ower Failure; System Shutting Down"

# If power was restored before the shutdown kicked in, cancel it.
pr:12345:powerokwait:/sbin/shutdown -c "ower Restored; Shutdown Cancelled"


軟體讓系統去執行/etc/inittab的如上語句...
gcc turn.c -o turn
./turn 0關
./trun 1開

以下代碼

1. 
   
2. #include <sys/types.h>
   
3. #include <sys/stat.h>
   
4. #include <sys/ioctl.h>
   
5. #include <fcntl.h>
   
6. #include <errno.h>
   
7. #include <stdlib.h>
   
8. #include <unistd.h>
   
9. #include <stdio.h>
   
10. #include <signal.h>
    
11. #include <syslog.h>                                                            
    
12. #include <string.h>
    
13. #include <paths.h>
    
14. 
    
15. #ifndef SIGPWR
    
16. 
    
17. #  define SIGPWR SIGUSR1
    
18. #endif
    
19. 
    
20. #define PWRSTAT         "/etc/powerstatus"
    
21. 
    
22. /* Tell init that the power has gone (1), is back (0),
    
23.    or the UPS batteries are low (2). */
    
24. void powerfail(int event)
    
25. {
    
26.   int fd;
    
27. 
    
28. /* Create an info file for init. */
    
29. unlink (PWRSTAT);
    
30. if ((fd = open(PWRSTAT, O_CREAT|O_WRONLY, 0644)) >= 0) {
    
31. switch (event)
    
32.       {
    
33.       case 0 :
    
34.               write(fd, "OK\n", 3);
    
35.               break;
    
36. 
    
37.       case 1:
    
38.              write(fd, "WAIT\n", 5);
    
39.              break;
    
40.       case 2:
    
41.       default:
    
42.              write(fd, "FAIL\n", 4);
    
43.              break;
    
44.       }
    
45.   close(fd);
    
46.   }
    
47.   kill(1, SIGPWR);
    
48. }
    
49. 
    
50. /* Main program. */
    
51. int main(int argc, char *argv[])
    
52. {
    
53. int DCD;
    
54. 
    
55. if (argc < 2) {
    
56.        fprintf(stderr, "Usage: turn [0|1]\n");
    
57.        exit(1);
    
58. }/* Start syslog. */
    
59. openlog("turn", LOG_CONS, LOG_DAEMON);
    
60. 
    
61. DCD = atoi(argv[1]);
    
62. if(DCD != 0) powerfail(0); else powerfail(1);
    
63. }
    
64. 
    

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轉貼請注明出處..?碜詌inuxsir ...........EXCELL-Kevin