libgo/go/syscall/libcall_linux_utimesnano.go

   1 // Copyright 2012 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 // GNU/Linux version of UtimesNano.
   6
   7 package syscall
   8
   9 import "unsafe"
  10
  11 //sys   utimensat(dirfd int, path string, times *[2]Timespec, flags int) (err error)
  12 //utimensat(dirfd _C_int, path *byte, times *[2]Timespec, flags _C_int) _C_int
  13 func UtimesNano(path string, ts []Timespec) (err error) {
  14         if len(ts) != 2 {
  15                 return EINVAL
  16         }
  17         err = utimensat(_AT_FDCWD, path, (*[2]Timespec)(unsafe.Pointer(&ts[0])), 0)
  18         if err != ENOSYS {
  19                 return err
  20         }
  21         // If the utimensat syscall isn't available (utimensat was added to Linux
  22         // in 2.6.22, Released, 8 July 2007) then fall back to utimes
  23         var tv [2]Timeval
  24         for i := 0; i < 2; i++ {
  25                 tv[i].Sec = Timeval_sec_t(ts[i].Sec)
  26                 tv[i].Usec = Timeval_usec_t(ts[i].Nsec / 1000)
  27         }
  28         return utimes(path, (*[2]Timeval)(unsafe.Pointer(&tv[0])))
  29 }