sleeptime
usleep(sleeptime);
static int sleeptime = SLEEPTIME; /* between attempts, in ms */
sleeptime = atoi(optarg);
int sleeptime, r;
sleeptime = 30000;
sleeptime = 10000;
sleeptime = 100;
sleeptime = 20;
sleeptime = 100;
mstohz(sleeptime));
if (usleep(sleeptime) < 0)
usleep(sleeptime / 3);
usleep(sleeptime / 3);
struct timespec sleeptime = {10, 0};
(long)sleeptime.tv_sec);
nanosleep(&sleeptime, NULL);
sleeptime.tv_sec <<= 1;
if (sleeptime.tv_sec <= 0) {
sleeptime.tv_sec = 10;