56 lines
1.3 KiB
C
56 lines
1.3 KiB
C
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/* Checks for the RS/6000 AIX adjtime() bug, in which if a negative
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* offset is given, the system gets messed up and never completes the
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* adjustment. If the problem is fixed, this program will print the
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* time, sit there for 10 seconds, and exit. If the problem isn't fixed,
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* the program will print an occasional "result=nnnnnn" (the residual
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* slew from adjtime()).
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*
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* Compile this with bsdcc and run it as root!
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*/
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#include <signal.h>
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#include <sys/time.h>
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#include <time.h>
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#include <stdio.h>
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int timeout();
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struct timeval adjustment, result;
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int
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main (
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int argc,
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char *argv[]
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)
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{
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struct itimerval value, oldvalue;
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int i;
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time_t curtime;
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curtime = time(0);
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printf("Starting: %s", ctime(&curtime));
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value.it_interval.tv_sec = value.it_value.tv_sec = 1;
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value.it_interval.tv_usec = value.it_value.tv_usec = 0;
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adjustment.tv_sec = 0;
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adjustment.tv_usec = -2000;
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signal(SIGALRM, timeout);
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setitimer(ITIMER_REAL, &value, &oldvalue);
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for (i=0; i<10; i++) {
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pause();
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}
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}
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int
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timeout(
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int sig,
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int code,
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struct sigcontext *scp
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)
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{
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signal (SIGALRM, timeout);
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if (adjtime(&adjustment, &result))
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printf("adjtime call failed\n");
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if (result.tv_sec != 0 || result.tv_usec != 0) {
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printf("result.u = %d.%06.6d ", (int) result.tv_sec,
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(int) result.tv_usec);
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}
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}
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