syscall: implement windows version of Utimes()

R=golang-dev, r
CC=golang-dev
https://golang.org/cl/2215044

src/pkg/os/stat_windows.go

@@ -39,8 +39,8 @@ func setFileInfo(fi *FileInfo, name string, fa, sizehi, sizelo uint32, ctime, at
 	fi.Size = int64(sizehi)<<32 + int64(sizelo)
 	fi.Name = name
 	fi.FollowedSymlink = false
-	fi.Atime_ns = atime.Microseconds() * 1000
-	fi.Mtime_ns = wtime.Microseconds() * 1000
-	fi.Ctime_ns = ctime.Microseconds() * 1000
+	fi.Atime_ns = atime.Nanoseconds()
+	fi.Mtime_ns = wtime.Nanoseconds()
+	fi.Ctime_ns = ctime.Nanoseconds()
 	return fi
 }

src/pkg/syscall/syscall_windows.go

@@ -70,12 +70,6 @@ func UTF16ToString(s []uint16) string {
 // the UTF-8 string s, with a terminating NUL added.
 func StringToUTF16Ptr(s string) *uint16 { return &StringToUTF16(s)[0] }
 
-func NsecToTimeval(nsec int64) (tv Timeval) {
-	tv.Sec = int32(nsec / 1e9)
-	tv.Usec = int32(nsec % 1e9 / 1e3)
-	return
-}
-
 // dll helpers
 
 // implemented in ../pkg/runtime/windows/syscall.cgo
@@ -147,6 +141,7 @@ func getSysProcAddr(m uint32, pname string) uintptr {
 //sys	FreeEnvironmentStrings(envs *uint16) (ok bool, errno int) = kernel32.FreeEnvironmentStringsW
 //sys	GetEnvironmentVariable(name *uint16, buffer *uint16, size uint32) (n uint32, errno int) = kernel32.GetEnvironmentVariableW
 //sys	SetEnvironmentVariable(name *uint16, value *uint16) (ok bool, errno int) = kernel32.SetEnvironmentVariableW
+//sys	SetFileTime(handle int32, ctime *Filetime, atime *Filetime, wtime *Filetime) (ok bool, errno int)
 
 // syscall interface implementation for other packages
 
@@ -394,10 +389,7 @@ func Ftruncate(fd int, length int64) (errno int) {
 func Gettimeofday(tv *Timeval) (errno int) {
 	var ft Filetime
 	GetSystemTimeAsFileTime(&ft)
-	ms := ft.Microseconds()
-	// split into sec / usec
-	tv.Sec = int32(ms / 1e6)
-	tv.Usec = int32(ms) - tv.Sec*1e6
+	*tv = NsecToTimeval(ft.Nanoseconds())
 	return 0
 }
 
@@ -419,9 +411,23 @@ func Pipe(p []int) (errno int) {
 	return 0
 }
 
-// TODO(brainman): implement Utimes, or rewrite os.file.Chtimes() instead
 func Utimes(path string, tv []Timeval) (errno int) {
-	return EWINDOWS
+	if len(tv) != 2 {
+		return EINVAL
+	}
+	h, e := CreateFile(StringToUTF16Ptr(path),
+		FILE_WRITE_ATTRIBUTES, FILE_SHARE_WRITE, nil,
+		OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0)
+	if e != 0 {
+		return e
+	}
+	defer Close(int(h))
+	a := NsecToFiletime(tv[0].Nanoseconds())
+	w := NsecToFiletime(tv[1].Nanoseconds())
+	if ok, e := SetFileTime(h, nil, &a, &w); !ok {
+		return e
+	}
+	return 0
 }
 
 // net api calls

src/pkg/syscall/zsyscall_windows_386.go

@@ -57,6 +57,7 @@ var (
 	procFreeEnvironmentStringsW    = getSysProcAddr(modkernel32, "FreeEnvironmentStringsW")
 	procGetEnvironmentVariableW    = getSysProcAddr(modkernel32, "GetEnvironmentVariableW")
 	procSetEnvironmentVariableW    = getSysProcAddr(modkernel32, "SetEnvironmentVariableW")
+	procSetFileTime                = getSysProcAddr(modkernel32, "SetFileTime")
 	procWSAStartup                 = getSysProcAddr(modwsock32, "WSAStartup")
 	procWSACleanup                 = getSysProcAddr(modwsock32, "WSACleanup")
 	procsocket                     = getSysProcAddr(modwsock32, "socket")
@@ -738,6 +739,21 @@ func SetEnvironmentVariable(name *uint16, value *uint16) (ok bool, errno int) {
 	return
 }
 
+func SetFileTime(handle int32, ctime *Filetime, atime *Filetime, wtime *Filetime) (ok bool, errno int) {
+	r0, _, e1 := Syscall6(procSetFileTime, uintptr(handle), uintptr(unsafe.Pointer(ctime)), uintptr(unsafe.Pointer(atime)), uintptr(unsafe.Pointer(wtime)), 0, 0)
+	ok = bool(r0 != 0)
+	if !ok {
+		if e1 != 0 {
+			errno = int(e1)
+		} else {
+			errno = EINVAL
+		}
+	} else {
+		errno = 0
+	}
+	return
+}
+
 func WSAStartup(verreq uint32, data *WSAData) (sockerrno int) {
 	r0, _, _ := Syscall(procWSAStartup, uintptr(verreq), uintptr(unsafe.Pointer(data)), 0)
 	sockerrno = int(r0)

src/pkg/syscall/ztypes_windows_386.go

@@ -57,6 +57,7 @@ const (
 	GENERIC_ALL     = 0x10000000
 
 	FILE_APPEND_DATA      = 0x00000004
+	FILE_WRITE_ATTRIBUTES = 0x00000100
 
 	FILE_SHARE_READ          = 0x00000001
 	FILE_SHARE_WRITE         = 0x00000002
@@ -155,6 +156,16 @@ type Timeval struct {
 	Usec int32
 }
 
+func (tv *Timeval) Nanoseconds() int64 {
+	return (int64(tv.Sec)*1e6 + int64(tv.Usec)) * 1e3
+}
+
+func NsecToTimeval(nsec int64) (tv Timeval) {
+	tv.Sec = int32(nsec / 1e9)
+	tv.Usec = int32(nsec % 1e9 / 1e3)
+	return
+}
+
 type Overlapped struct {
 	Internal     uint32
 	InternalHigh uint32
@@ -168,14 +179,25 @@ type Filetime struct {
 	HighDateTime uint32
 }
 
-func (ft *Filetime) Microseconds() int64 {
+func (ft *Filetime) Nanoseconds() int64 {
 	// 100-nanosecond intervals since January 1, 1601
-	ms := int64(ft.HighDateTime)<<32 + int64(ft.LowDateTime)
-	// convert into microseconds
-	ms /= 10
+	nsec := int64(ft.HighDateTime)<<32 + int64(ft.LowDateTime)
 	// change starting time to the Epoch (00:00:00 UTC, January 1, 1970)
-	ms -= 11644473600000000
-	return ms
+	nsec -= 116444736000000000
+	// convert into nanoseconds
+	nsec *= 100
+	return nsec
+}
+
+func NsecToFiletime(nsec int64) (ft Filetime) {
+	// convert into 100-nanosecond
+	nsec /= 100
+	// change starting time to January 1, 1601
+	nsec += 116444736000000000
+	// split into high / low
+	ft.LowDateTime = uint32(nsec & 0xffffffff)
+	ft.HighDateTime = uint32(nsec >> 32 & 0xffffffff)
+	return ft
 }
 
 type Win32finddata struct {