1#include <sys/stat.h>
 2#include <sys/time.h>
 3#include <fcntl.h>
 4#include <errno.h>
 5#include "syscall.h"
 6
 7#define IS32BIT(x) !((x)+0x80000000ULL>>32)
 8#define NS_SPECIAL(ns) ((ns)==UTIME_NOW || (ns)==UTIME_OMIT)
 9
10int utimensat(int fd, const char *path, const struct timespec times[2], int flags)
11{
12	int r;
13	if (times && times[0].tv_nsec==UTIME_NOW && times[1].tv_nsec==UTIME_NOW)
14		times = 0;
15#ifdef SYS_utimensat_time64
16	r = -ENOSYS;
17	time_t s0=0, s1=0;
18	long ns0=0, ns1=0;
19	if (times) {
20		ns0 = times[0].tv_nsec;
21		ns1 = times[1].tv_nsec;
22		if (!NS_SPECIAL(ns0)) s0 = times[0].tv_sec;
23		if (!NS_SPECIAL(ns1)) s1 = times[1].tv_sec;
24	}
25	if (SYS_utimensat == SYS_utimensat_time64 || !IS32BIT(s0) || !IS32BIT(s1))
26		r = __syscall(SYS_utimensat_time64, fd, path, times ?
27			((long long[]){s0, ns0, s1, ns1}) : 0, flags);
28	if (SYS_utimensat == SYS_utimensat_time64 || r!=-ENOSYS)
29		return __syscall_ret(r);
30	if (!IS32BIT(s0) || !IS32BIT(s1))
31		return __syscall_ret(-ENOTSUP);
32	r = __syscall(SYS_utimensat, fd, path,
33		times ? ((long[]){s0, ns0, s1, ns1}) : 0, flags);
34#else
35	r = __syscall(SYS_utimensat, fd, path, times, flags);
36#endif
37
38#ifdef SYS_futimesat
39	if (r != -ENOSYS || flags) return __syscall_ret(r);
40	long *tv=0, tmp[4];
41	if (times) {
42		int i;
43		tv = tmp;
44		for (i=0; i<2; i++) {
45			if (times[i].tv_nsec >= 1000000000ULL) {
46				if (NS_SPECIAL(times[i].tv_nsec))
47					return __syscall_ret(-ENOSYS);
48				return __syscall_ret(-EINVAL);
49			}
50			tmp[2*i+0] = times[i].tv_sec;
51			tmp[2*i+1] = times[i].tv_nsec / 1000;
52		}
53	}
54
55	r = __syscall(SYS_futimesat, fd, path, tv);
56	if (r != -ENOSYS || fd != AT_FDCWD) return __syscall_ret(r);
57	r = __syscall(SYS_utimes, path, tv);
58#endif
59	return __syscall_ret(r);
60}