github.com/afumu/libc@v0.0.6/musl/src/stat/utimensat.c (about)

     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  
    10  int 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  }