1#include <time.h>
 2#include <errno.h>
 3#include "syscall.h"
 4
 5#define IS32BIT(x) !((x)+0x80000000ULL>>32)
 6#define CLAMP(x) (int)(IS32BIT(x) ? (x) : 0x7fffffffU+((0ULL+(x))>>63))
 7
 8int __clock_nanosleep(clockid_t clk, int flags, const struct timespec *req, struct timespec *rem)
 9{
10	if (clk == CLOCK_THREAD_CPUTIME_ID) return EINVAL;
11#ifdef SYS_clock_nanosleep_time64
12	time_t s = req->tv_sec;
13	long ns = req->tv_nsec;
14	int r = -ENOSYS;
15	if (SYS_clock_nanosleep == SYS_clock_nanosleep_time64 || !IS32BIT(s))
16		r = __syscall_cp(SYS_clock_nanosleep_time64, clk, flags,
17			((long long[]){s, ns}), rem);
18	if (SYS_clock_nanosleep == SYS_clock_nanosleep_time64 || r!=-ENOSYS)
19		return -r;
20	long long extra = s - CLAMP(s);
21	long ts32[2] = { CLAMP(s), ns };
22	if (clk == CLOCK_REALTIME && !flags)
23		r = __syscall_cp(SYS_nanosleep, &ts32, &ts32);
24	else
25		r = __syscall_cp(SYS_clock_nanosleep, clk, flags, &ts32, &ts32);
26	if (r==-EINTR && rem && !(flags & TIMER_ABSTIME)) {
27		rem->tv_sec = ts32[0] + extra;
28		rem->tv_nsec = ts32[1];
29	}
30	return -r;
31#else
32	if (clk == CLOCK_REALTIME && !flags)
33		return -__syscall_cp(SYS_nanosleep, req, rem);
34	return -__syscall_cp(SYS_clock_nanosleep, clk, flags, req, rem);
35#endif
36}
37
38weak_alias(__clock_nanosleep, clock_nanosleep);