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signed) value->tv_sec;
unsigned long usec = (unsigned) value->tv_usec;
if (sec > (ULONG_MAX / HZ))
return ULONG_MAX;
usec += 1000000 / HZ - 1;
usec /= 1000000 / HZ;
return HZ*sec+usec;
}
static void jiffiestotv(unsigned long jiffies, struct timeval *value)
{
value->tv_usec = (jiffies % HZ) * (1000000 / HZ);
value->tv_sec = jiffies / HZ;
}
7．7．2 真实间隔定时器ITIMER_REAL的底层运行机制
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