29 lines
847 B
C
29 lines
847 B
C
|
/* Subtract the `struct timeval' values X and Y,
|
||
|
|
storing the result in RESULT.
|
||
|
|
Return 1 if the difference is negative, otherwise 0. */
|
||
|
|
|
||
|
|
int
|
||
|
|
timeval_subtract (result, x, y)
|
||
|
|
struct timeval *result, *x, *y;
|
||
|
|
{
|
||
|
|
/* Perform the carry for the later subtraction by updating @var{y}. */
|
||
|
|
if (x->tv_usec < y->tv_usec) {
|
||
|
|
int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
|
||
|
|
y->tv_usec -= 1000000 * nsec;
|
||
|
|
y->tv_sec += nsec;
|
||
|
|
}
|
||
|
|
if (x->tv_usec - y->tv_usec > 1000000) {
|
||
|
|
int nsec = (x->tv_usec - y->tv_usec) / 1000000;
|
||
|
|
y->tv_usec += 1000000 * nsec;
|
||
|
|
y->tv_sec -= nsec;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Compute the time remaining to wait.
|
||
|
|
@code{tv_usec} is certainly positive. */
|
||
|
|
result->tv_sec = x->tv_sec - y->tv_sec;
|
||
|
|
result->tv_usec = x->tv_usec - y->tv_usec;
|
||
|
|
|
||
|
|
/* Return 1 if result is negative. */
|
||
|
|
return x->tv_sec < y->tv_sec;
|
||
|
|
}
|