- if (!at) goto notimeout;
- if (at->tv_nsec >= 1000000000UL)
- return EINVAL;
- if (clk == CLOCK_REALTIME || clk == CLOCK_MONOTONIC) {
- if (clk == CLOCK_REALTIME) flag = FUTEX_CLOCK_REALTIME;
- if (cp) r = -__syscall_cp(SYS_futex, addr, FUTEX_WAIT_BITSET|flag, val, at, 0, -1);
- else r = -__syscall(SYS_futex, addr, FUTEX_WAIT_BITSET|flag, val, at, 0, -1);
- if (r != EINVAL && r != ENOSYS) goto done;
- }
- if (clock_gettime(clk, &to)) return EINVAL;
- to.tv_sec = at->tv_sec - to.tv_sec;
- if ((to.tv_nsec = at->tv_nsec - to.tv_nsec) < 0) {
- to.tv_sec--;
- to.tv_nsec += 1000000000;
+ if (at) {
+ if (at->tv_nsec >= 1000000000UL) return EINVAL;
+ if (clock_gettime(clk, &to)) return EINVAL;
+ to.tv_sec = at->tv_sec - to.tv_sec;
+ if ((to.tv_nsec = at->tv_nsec - to.tv_nsec) < 0) {
+ to.tv_sec--;
+ to.tv_nsec += 1000000000;
+ }
+ if (to.tv_sec < 0) return ETIMEDOUT;
+ top = &to;