clock_nanosleep避免过度睡眠

/*
 *   “oversleeping” problem is particularly marked for a process that uses a loop to re start
 *   a sleep that is interrupted by a signal handler. If signals are delivered at a high rate
 *   , then a relative sleep (of the type performed by nanosleep()) can lead to large inaccuracies 
 *   in the time a process spends sleeping. We can avoid the oversleeping problem by making an
 *   initial call to clock_gettime() to retrieve the time, adding the  desired amount to that time, 
 *   and then calling  clock_nanosleep() with the TIMER_ABSTIME  flag (and restarting the system
 *   call if it is interrupted by a signal handler).
 */

struct timespec request;
/* Retrieve current value of CLOCK_REALTIME clock */
if (clock_gettime(CLOCK_REALTIME, &request) == -1) 
    errExit("clock_gettime");
request.tv_sec += 20;               /* Sleep for 20 seconds from now */
s = clock_nanosleep(CLOCK_REALTIME, TIMER_ABSTIME, &request, NULL); 
if (s != 0) {
    if (s == EINTR)
        printf("Interrupted by signal handlern");
    else
        errExitEN(s, "clock_nanosleep");
}

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