+#define IS32BIT(x) !((x)+0x80000000ULL>>32)
+#define CLAMP(x) (int)(IS32BIT(x) ? (x) : 0x7fffffffU+((0ULL+(x))>>63))
+
+static int do_sigtimedwait(const sigset_t *restrict mask, siginfo_t *restrict si, const struct timespec *restrict ts)
+{
+#ifdef SYS_rt_sigtimedwait_time64
+ time_t s = ts ? ts->tv_sec : 0;
+ long ns = ts ? ts->tv_nsec : 0;
+ int r = -ENOSYS;
+ if (SYS_rt_sigtimedwait == SYS_rt_sigtimedwait_time64 || !IS32BIT(s))
+ r = __syscall_cp(SYS_rt_sigtimedwait_time64, mask, si,
+ ts ? ((long long[]){s, ns}) : 0, _NSIG/8);
+ if (SYS_rt_sigtimedwait == SYS_rt_sigtimedwait_time64 || r!=-ENOSYS)
+ return r;
+ return __syscall_cp(SYS_rt_sigtimedwait, mask, si,
+ ts ? ((long[]){CLAMP(s), ns}) : 0, _NSIG/8);;
+#else
+ return __syscall_cp(SYS_rt_sigtimedwait, mask, si, ts, _NSIG/8);
+#endif
+}
+