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