os, syscall: more mingw

R=rsc, rsc1
CC=golang-dev
https://golang.org/cl/878046

src/pkg/os/file.go

@@ -237,17 +237,6 @@ func Stat(name string) (fi *FileInfo, err Error) {
 	return fileInfoFromStat(name, new(FileInfo), &lstat, statp), nil
 }
 
-// Stat returns the FileInfo structure describing file.
-// It returns the FileInfo and an error, if any.
-func (file *File) Stat() (fi *FileInfo, err Error) {
-	var stat syscall.Stat_t
-	e := syscall.Fstat(file.fd, &stat)
-	if e != 0 {
-		return nil, &PathError{"stat", file.name, Errno(e)}
-	}
-	return fileInfoFromStat(file.name, new(FileInfo), &stat, &stat), nil
-}
-
 // Lstat returns the FileInfo structure describing the named file and an
 // error, if any.  If the file is a symbolic link, the returned FileInfo
 // describes the symbolic link.  Lstat makes no attempt to follow the link.
@@ -301,6 +290,9 @@ func Remove(name string) Error {
 	// file path, like /etc/passwd/foo, but in that case,
 	// both errors will be ENOTDIR, so it's okay to
 	// use the error from unlink.
+	// For windows syscall.ENOTDIR is set
+	// to syscall.ERROR_DIRECTORY, hopefully it should
+	// do the trick.
 	if e1 != syscall.ENOTDIR {
 		e = e1
 	}
@@ -407,15 +399,6 @@ func (f *File) Chown(uid, gid int) Error {
 	return nil
 }
 
-// Truncate changes the size of the named file.
-// If the file is a symbolic link, it changes the size of the link's target.
-func Truncate(name string, size int64) Error {
-	if e := syscall.Truncate(name, size); e != 0 {
-		return &PathError{"truncate", name, Errno(e)}
-	}
-	return nil
-}
-
 // Truncate changes the size of the file.
 // It does not change the I/O offset.
 func (f *File) Truncate(size int64) Error {

src/pkg/os/file_mingw.go

@@ -85,6 +85,27 @@ func (file *File) Close() Error {
 	return err
 }
 
+func (file *File) statFile(name string) (fi *FileInfo, err Error) {
+	var stat syscall.ByHandleFileInformation
+	if ok, e := syscall.GetFileInformationByHandle(int32(file.fd), &stat); !ok {
+		return nil, &PathError{"stat", file.name, Errno(e)}
+	}
+	return fileInfoFromByHandleInfo(new(FileInfo), file.name, &stat), nil
+}
+
+// Stat returns the FileInfo structure describing file.
+// It returns the FileInfo and an error, if any.
+func (file *File) Stat() (fi *FileInfo, err Error) {
+	if file == nil || file.fd < 0 {
+		return nil, EINVAL
+	}
+	if file.isdir() {
+		// I don't know any better way to do that for directory
+		return Stat(file.name)
+	}
+	return file.statFile(file.name)
+}
+
 // Readdir reads the contents of the directory associated with file and
 // returns an array of up to count FileInfo structures, as would be returned
 // by Stat, in directory order.  Subsequent calls on the same file will yield
@@ -112,7 +133,7 @@ func (file *File) Readdir(count int) (fi []FileInfo, err Error) {
 			}
 		}
 		var f FileInfo
-		fileInfoFromStat("", &f, &di.stat, &di.stat)
+		fileInfoFromWin32finddata(&f, &di.stat.Windata)
 		if f.Name == "." || f.Name == ".." { // Useless names
 			continue
 		}
@@ -129,3 +150,18 @@ func (file *File) Readdir(count int) (fi []FileInfo, err Error) {
 	}
 	return fi, nil
 }
+
+// Truncate changes the size of the named file.
+// If the file is a symbolic link, it changes the size of the link's target.
+func Truncate(name string, size int64) Error {
+	f, e := Open(name, O_WRONLY|O_CREAT, 0666)
+	if e != nil {
+		return e
+	}
+	defer f.Close()
+	e1 := f.Truncate(size)
+	if e1 != nil {
+		return e1
+	}
+	return nil
+}

src/pkg/os/file_unix.go

@@ -53,6 +53,17 @@ func (file *File) Close() Error {
 	return err
 }
 
+// Stat returns the FileInfo structure describing file.
+// It returns the FileInfo and an error, if any.
+func (file *File) Stat() (fi *FileInfo, err Error) {
+	var stat syscall.Stat_t
+	e := syscall.Fstat(file.fd, &stat)
+	if e != 0 {
+		return nil, &PathError{"stat", file.name, Errno(e)}
+	}
+	return fileInfoFromStat(file.name, new(FileInfo), &stat, &stat), nil
+}
+
 // Readdir reads the contents of the directory associated with file and
 // returns an array of up to count FileInfo structures, as would be returned
 // by Stat, in directory order.  Subsequent calls on the same file will yield
@@ -80,3 +91,12 @@ func (file *File) Readdir(count int) (fi []FileInfo, err Error) {
 	}
 	return
 }
+
+// Truncate changes the size of the named file.
+// If the file is a symbolic link, it changes the size of the link's target.
+func Truncate(name string, size int64) Error {
+	if e := syscall.Truncate(name, size); e != 0 {
+		return &PathError{"truncate", name, Errno(e)}
+	}
+	return nil
+}

src/pkg/os/stat_mingw.go

@@ -7,21 +7,39 @@ package os
 import "syscall"
 
 func fileInfoFromStat(name string, fi *FileInfo, lstat, stat *syscall.Stat_t) *FileInfo {
+	return fileInfoFromWin32finddata(fi, &stat.Windata)
+}
+
+func fileInfoFromWin32finddata(fi *FileInfo, d *syscall.Win32finddata) *FileInfo {
+	return setFileInfo(fi, string(syscall.UTF16ToString(d.FileName[0:])), d.FileAttributes, d.FileSizeHigh, d.FileSizeLow, d.CreationTime, d.LastAccessTime, d.LastWriteTime)
+}
+
+func fileInfoFromByHandleInfo(fi *FileInfo, name string, d *syscall.ByHandleFileInformation) *FileInfo {
+	for i := len(name) - 1; i >= 0; i-- {
+		if name[i] == '/' || name[i] == '\\' {
+			name = name[i+1:]
+			break
+		}
+	}
+	return setFileInfo(fi, name, d.FileAttributes, d.FileSizeHigh, d.FileSizeLow, d.CreationTime, d.LastAccessTime, d.LastWriteTime)
+}
+
+func setFileInfo(fi *FileInfo, name string, fa, sizehi, sizelo uint32, ctime, atime, wtime syscall.Filetime) *FileInfo {
 	fi.Mode = 0
-	if stat.Windata.FileAttributes == syscall.FILE_ATTRIBUTE_DIRECTORY {
+	if fa == syscall.FILE_ATTRIBUTE_DIRECTORY {
 		fi.Mode = fi.Mode | syscall.S_IFDIR
 	} else {
 		fi.Mode = fi.Mode | syscall.S_IFREG
 	}
-	if stat.Windata.FileAttributes == syscall.FILE_ATTRIBUTE_READONLY {
+	if fa == syscall.FILE_ATTRIBUTE_READONLY {
 		fi.Mode = fi.Mode | 0444
 	} else {
 		fi.Mode = fi.Mode | 0666
 	}
-	fi.Size = int64(stat.Windata.FileSizeHigh)<<32 + int64(stat.Windata.FileSizeLow)
+	fi.Size = int64(sizehi)<<32 + int64(sizelo)
-	fi.Name = string(syscall.UTF16ToString(stat.Windata.FileName[0:]))
+	fi.Name = name
 	fi.FollowedSymlink = false
-	// TODO(brainman): use CreationTime LastAccessTime LastWriteTime to prime following Dir fields
+	// TODO(brainman): use ctime atime wtime to prime following FileInfo fields
 	fi.Atime_ns = 0
 	fi.Mtime_ns = 0
 	fi.Ctime_ns = 0

src/pkg/os/sys_mingw.go

@@ -4,4 +4,12 @@
 
 package os
 
-func Hostname() (name string, err Error) { return "windows", nil }
+import "syscall"
+
+func Hostname() (name string, err Error) {
+	s, e := syscall.ComputerName()
+	if e != 0 {
+		return "", NewSyscallError("ComputerName", e)
+	}
+	return s, nil
+}

src/pkg/syscall/syscall_mingw.go

@@ -111,6 +111,16 @@ func getSysProcAddr(m uint32, pname string) uintptr {
 //sys	FindFirstFile(name *uint16, data *Win32finddata) (handle int32, errno int) [failretval=-1] = FindFirstFileW
 //sys	FindNextFile(handle int32, data *Win32finddata) (ok bool, errno int) = FindNextFileW
 //sys	FindClose(handle int32) (ok bool, errno int)
+//sys	GetFileInformationByHandle(handle int32, data *ByHandleFileInformation) (ok bool, errno int)
+//sys	GetCurrentDirectory(buflen uint32, buf *uint16) (n uint32, errno int) = GetCurrentDirectoryW
+//sys	SetCurrentDirectory(path *uint16) (ok bool, errno int) = SetCurrentDirectoryW
+//sys	CreateDirectory(path *uint16, sa *byte) (ok bool, errno int) = CreateDirectoryW
+//sys	RemoveDirectory(path *uint16) (ok bool, errno int) = RemoveDirectoryW
+//sys	DeleteFile(path *uint16) (ok bool, errno int) = DeleteFileW
+//sys	MoveFile(from *uint16, to *uint16) (ok bool, errno int) = MoveFileW
+//sys	GetComputerName(buf *uint16, n *uint32) (ok bool, errno int) = GetComputerNameW
+//sys	SetEndOfFile(handle int32) (ok bool, errno int)
+//sys	GetSystemTimeAsFileTime(time *Filetime)
 
 // syscall interface implementation for other packages
 
@@ -118,7 +128,7 @@ func Errstr(errno int) string {
 	if errno == EMINGW {
 		return "not supported by windows"
 	}
-	var b = make([]uint16, 300)
+	b := make([]uint16, 300)
 	n, err := FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_ARGUMENT_ARRAY, 0, uint32(errno), 0, b, nil)
 	if err != 0 {
 		return "error " + str(errno) + " (FormatMessage failed with err=" + str(err) + ")"
@@ -175,21 +185,18 @@ func Read(fd int, p []byte) (n int, errno int) {
 // not sure if I should do that
 
 func Pread(fd int, p []byte, offset int64) (n int, errno int) {
-	var o Overlapped
-	o.OffsetHigh = uint32(offset >> 32)
-	o.Offset = uint32(offset)
 	curoffset, e := Seek(fd, 0, 1)
 	if e != 0 {
 		return 0, e
 	}
+	defer Seek(fd, curoffset, 0)
+	var o Overlapped
+	o.OffsetHigh = uint32(offset >> 32)
+	o.Offset = uint32(offset)
 	var done uint32
 	if ok, e := ReadFile(int32(fd), p, &done, &o); !ok {
 		return 0, e
 	}
-	_, e = Seek(fd, curoffset, 0)
-	if e != 0 {
-		return 0, e
-	}
 	return int(done), 0
 }
 
@@ -202,21 +209,18 @@ func Write(fd int, p []byte) (n int, errno int) {
 }
 
 func Pwrite(fd int, p []byte, offset int64) (n int, errno int) {
-	var o Overlapped
-	o.OffsetHigh = uint32(offset >> 32)
-	o.Offset = uint32(offset)
 	curoffset, e := Seek(fd, 0, 1)
 	if e != 0 {
 		return 0, e
 	}
+	defer Seek(fd, curoffset, 0)
+	var o Overlapped
+	o.OffsetHigh = uint32(offset >> 32)
+	o.Offset = uint32(offset)
 	var done uint32
 	if ok, e := WriteFile(int32(fd), p, &done, &o); !ok {
 		return 0, e
 	}
-	_, e = Seek(fd, curoffset, 0)
-	if e != 0 {
-		return 0, e
-	}
 	return int(done), 0
 }
 
@@ -272,6 +276,93 @@ func Lstat(path string, stat *Stat_t) (errno int) {
 	return Stat(path, stat)
 }
 
+const ImplementsGetwd = true
+
+func Getwd() (wd string, errno int) {
+	b := make([]uint16, 300)
+	n, e := GetCurrentDirectory(uint32(len(b)), &b[0])
+	if e != 0 {
+		return "", e
+	}
+	return string(utf16.Decode(b[0:n])), 0
+}
+
+func Chdir(path string) (errno int) {
+	if ok, e := SetCurrentDirectory(&StringToUTF16(path)[0]); !ok {
+		return e
+	}
+	return 0
+}
+
+func Mkdir(path string, mode int) (errno int) {
+	if ok, e := CreateDirectory(&StringToUTF16(path)[0], nil); !ok {
+		return e
+	}
+	return 0
+}
+
+func Rmdir(path string) (errno int) {
+	if ok, e := RemoveDirectory(&StringToUTF16(path)[0]); !ok {
+		return e
+	}
+	return 0
+}
+
+func Unlink(path string) (errno int) {
+	if ok, e := DeleteFile(&StringToUTF16(path)[0]); !ok {
+		return e
+	}
+	return 0
+}
+
+func Rename(oldpath, newpath string) (errno int) {
+	from := &StringToUTF16(oldpath)[0]
+	to := &StringToUTF16(newpath)[0]
+	if ok, e := MoveFile(from, to); !ok {
+		return e
+	}
+	return 0
+}
+
+func ComputerName() (name string, errno int) {
+	var n uint32 = MAX_COMPUTERNAME_LENGTH + 1
+	b := make([]uint16, n)
+	if ok, e := GetComputerName(&b[0], &n); !ok {
+		return "", e
+	}
+	return string(utf16.Decode(b[0:n])), 0
+}
+
+func Ftruncate(fd int, length int64) (errno int) {
+	curoffset, e := Seek(fd, 0, 1)
+	if e != 0 {
+		return e
+	}
+	defer Seek(fd, curoffset, 0)
+	if _, e := Seek(fd, length, 0); e != 0 {
+		return e
+	}
+	if _, e := SetEndOfFile(int32(fd)); e != 0 {
+		return e
+	}
+	return 0
+}
+
+func Gettimeofday(tv *Timeval) (errno int) {
+	var ft Filetime
+	// 100-nanosecond intervals since January 1, 1601
+	GetSystemTimeAsFileTime(&ft)
+	t := uint64(ft.HighDateTime)<<32 + uint64(ft.LowDateTime)
+	// convert into microseconds
+	t /= 10
+	// change starting time to the Epoch (00:00:00 UTC, January 1, 1970)
+	t -= 11644473600000000
+	// split into sec / usec
+	tv.Sec = int32(t / 1e6)
+	tv.Usec = int32(t) - tv.Sec
+	return 0
+}
+
 // TODO(brainman): fix all needed for os
 
 const (
@@ -281,33 +372,21 @@ const (
 func Getpid() (pid int)   { return -1 }
 func Getppid() (ppid int) { return -1 }
 
-func Mkdir(path string, mode int) (errno int)             { return EMINGW }
-func Fstat(fd int, stat *Stat_t) (errno int)              { return EMINGW }
-func Chdir(path string) (errno int)                       { return EMINGW }
 func Fchdir(fd int) (errno int)                           { return EMINGW }
-func Unlink(path string) (errno int)                      { return EMINGW }
-func Rmdir(path string) (errno int)                       { return EMINGW }
 func Link(oldpath, newpath string) (errno int)            { return EMINGW }
 func Symlink(path, link string) (errno int)               { return EMINGW }
 func Readlink(path string, buf []byte) (n int, errno int) { return 0, EMINGW }
-func Rename(oldpath, newpath string) (errno int)          { return EMINGW }
 func Chmod(path string, mode int) (errno int)             { return EMINGW }
 func Fchmod(fd int, mode int) (errno int)                 { return EMINGW }
 func Chown(path string, uid int, gid int) (errno int)     { return EMINGW }
 func Lchown(path string, uid int, gid int) (errno int)    { return EMINGW }
 func Fchown(fd int, uid int, gid int) (errno int)         { return EMINGW }
-func Truncate(name string, size int64) (errno int)        { return EMINGW }
-func Ftruncate(fd int, length int64) (errno int)          { return EMINGW }
 
-const ImplementsGetwd = true
+func Getuid() (uid int)                  { return -1 }
-
+func Geteuid() (euid int)                { return -1 }
-func Getwd() (wd string, errno int)        { return "", EMINGW }
+func Getgid() (gid int)                  { return -1 }
-func Getuid() (uid int)                    { return -1 }
+func Getegid() (egid int)                { return -1 }
-func Geteuid() (euid int)                  { return -1 }
+func Getgroups() (gids []int, errno int) { return nil, EMINGW }
-func Getgid() (gid int)                    { return -1 }
-func Getegid() (egid int)                  { return -1 }
-func Getgroups() (gids []int, errno int)   { return nil, EMINGW }
-func Gettimeofday(tv *Timeval) (errno int) { return EMINGW }
 
 // TODO(brainman): fix all this meaningless code, it is here to compile exec.go
 

src/pkg/syscall/zerrors_mingw_386.go

@@ -11,6 +11,7 @@ const (
 	ERROR_INSUFFICIENT_BUFFER = 122
 	ERROR_MOD_NOT_FOUND       = 126
 	ERROR_PROC_NOT_FOUND      = 127
+	ERROR_DIRECTORY           = 267
 	// TODO(brainman): should use value for EMINGW that does not clashes with anything else
 	EMINGW = 99999 /* otherwise unused */
 )
@@ -36,7 +37,7 @@ const (
 	EEXIST          = 17
 	EXDEV           = 18
 	ENODEV          = 19
-	ENOTDIR         = 20
+	ENOTDIR         = ERROR_DIRECTORY
 	EISDIR          = 21
 	EINVAL          = 22
 	ENFILE          = 23

src/pkg/syscall/zsyscall_mingw_386.go

@@ -6,23 +6,33 @@ package syscall
 import "unsafe"
 
 var (
-	modKERNEL32        = loadDll("kernel32.dll")
+	modKERNEL32                    = loadDll("kernel32.dll")
-	procGetLastError   = getSysProcAddr(modKERNEL32, "GetLastError")
+	procGetLastError               = getSysProcAddr(modKERNEL32, "GetLastError")
-	procLoadLibraryW   = getSysProcAddr(modKERNEL32, "LoadLibraryW")
+	procLoadLibraryW               = getSysProcAddr(modKERNEL32, "LoadLibraryW")
-	procFreeLibrary    = getSysProcAddr(modKERNEL32, "FreeLibrary")
+	procFreeLibrary                = getSysProcAddr(modKERNEL32, "FreeLibrary")
-	procGetProcAddress = getSysProcAddr(modKERNEL32, "GetProcAddress")
+	procGetProcAddress             = getSysProcAddr(modKERNEL32, "GetProcAddress")
-	procGetVersion     = getSysProcAddr(modKERNEL32, "GetVersion")
+	procGetVersion                 = getSysProcAddr(modKERNEL32, "GetVersion")
-	procFormatMessageW = getSysProcAddr(modKERNEL32, "FormatMessageW")
+	procFormatMessageW             = getSysProcAddr(modKERNEL32, "FormatMessageW")
-	procExitProcess    = getSysProcAddr(modKERNEL32, "ExitProcess")
+	procExitProcess                = getSysProcAddr(modKERNEL32, "ExitProcess")
-	procCreateFileW    = getSysProcAddr(modKERNEL32, "CreateFileW")
+	procCreateFileW                = getSysProcAddr(modKERNEL32, "CreateFileW")
-	procReadFile       = getSysProcAddr(modKERNEL32, "ReadFile")
+	procReadFile                   = getSysProcAddr(modKERNEL32, "ReadFile")
-	procWriteFile      = getSysProcAddr(modKERNEL32, "WriteFile")
+	procWriteFile                  = getSysProcAddr(modKERNEL32, "WriteFile")
-	procSetFilePointer = getSysProcAddr(modKERNEL32, "SetFilePointer")
+	procSetFilePointer             = getSysProcAddr(modKERNEL32, "SetFilePointer")
-	procCloseHandle    = getSysProcAddr(modKERNEL32, "CloseHandle")
+	procCloseHandle                = getSysProcAddr(modKERNEL32, "CloseHandle")
-	procGetStdHandle   = getSysProcAddr(modKERNEL32, "GetStdHandle")
+	procGetStdHandle               = getSysProcAddr(modKERNEL32, "GetStdHandle")
-	procFindFirstFileW = getSysProcAddr(modKERNEL32, "FindFirstFileW")
+	procFindFirstFileW             = getSysProcAddr(modKERNEL32, "FindFirstFileW")
-	procFindNextFileW  = getSysProcAddr(modKERNEL32, "FindNextFileW")
+	procFindNextFileW              = getSysProcAddr(modKERNEL32, "FindNextFileW")
-	procFindClose      = getSysProcAddr(modKERNEL32, "FindClose")
+	procFindClose                  = getSysProcAddr(modKERNEL32, "FindClose")
+	procGetFileInformationByHandle = getSysProcAddr(modKERNEL32, "GetFileInformationByHandle")
+	procGetCurrentDirectoryW       = getSysProcAddr(modKERNEL32, "GetCurrentDirectoryW")
+	procSetCurrentDirectoryW       = getSysProcAddr(modKERNEL32, "SetCurrentDirectoryW")
+	procCreateDirectoryW           = getSysProcAddr(modKERNEL32, "CreateDirectoryW")
+	procRemoveDirectoryW           = getSysProcAddr(modKERNEL32, "RemoveDirectoryW")
+	procDeleteFileW                = getSysProcAddr(modKERNEL32, "DeleteFileW")
+	procMoveFileW                  = getSysProcAddr(modKERNEL32, "MoveFileW")
+	procGetComputerNameW           = getSysProcAddr(modKERNEL32, "GetComputerNameW")
+	procSetEndOfFile               = getSysProcAddr(modKERNEL32, "SetEndOfFile")
+	procGetSystemTimeAsFileTime    = getSysProcAddr(modKERNEL32, "GetSystemTimeAsFileTime")
 )
 
 func GetLastError() (lasterrno int) {
@@ -201,3 +211,107 @@ func FindClose(handle int32) (ok bool, errno int) {
 	}
 	return
 }
+
+func GetFileInformationByHandle(handle int32, data *ByHandleFileInformation) (ok bool, errno int) {
+	r0, _, e1 := Syscall(procGetFileInformationByHandle, uintptr(handle), uintptr(unsafe.Pointer(data)), 0)
+	ok = bool(r0 != 0)
+	if !ok {
+		errno = int(e1)
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func GetCurrentDirectory(buflen uint32, buf *uint16) (n uint32, errno int) {
+	r0, _, e1 := Syscall(procGetCurrentDirectoryW, uintptr(buflen), uintptr(unsafe.Pointer(buf)), 0)
+	n = uint32(r0)
+	if n == 0 {
+		errno = int(e1)
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func SetCurrentDirectory(path *uint16) (ok bool, errno int) {
+	r0, _, e1 := Syscall(procSetCurrentDirectoryW, uintptr(unsafe.Pointer(path)), 0, 0)
+	ok = bool(r0 != 0)
+	if !ok {
+		errno = int(e1)
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func CreateDirectory(path *uint16, sa *byte) (ok bool, errno int) {
+	r0, _, e1 := Syscall(procCreateDirectoryW, uintptr(unsafe.Pointer(path)), uintptr(unsafe.Pointer(sa)), 0)
+	ok = bool(r0 != 0)
+	if !ok {
+		errno = int(e1)
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func RemoveDirectory(path *uint16) (ok bool, errno int) {
+	r0, _, e1 := Syscall(procRemoveDirectoryW, uintptr(unsafe.Pointer(path)), 0, 0)
+	ok = bool(r0 != 0)
+	if !ok {
+		errno = int(e1)
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func DeleteFile(path *uint16) (ok bool, errno int) {
+	r0, _, e1 := Syscall(procDeleteFileW, uintptr(unsafe.Pointer(path)), 0, 0)
+	ok = bool(r0 != 0)
+	if !ok {
+		errno = int(e1)
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func MoveFile(from *uint16, to *uint16) (ok bool, errno int) {
+	r0, _, e1 := Syscall(procMoveFileW, uintptr(unsafe.Pointer(from)), uintptr(unsafe.Pointer(to)), 0)
+	ok = bool(r0 != 0)
+	if !ok {
+		errno = int(e1)
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func GetComputerName(buf *uint16, n *uint32) (ok bool, errno int) {
+	r0, _, e1 := Syscall(procGetComputerNameW, uintptr(unsafe.Pointer(buf)), uintptr(unsafe.Pointer(n)), 0)
+	ok = bool(r0 != 0)
+	if !ok {
+		errno = int(e1)
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func SetEndOfFile(handle int32) (ok bool, errno int) {
+	r0, _, e1 := Syscall(procSetEndOfFile, uintptr(handle), 0, 0)
+	ok = bool(r0 != 0)
+	if !ok {
+		errno = int(e1)
+	} else {
+		errno = 0
+	}
+	return
+}
+
+func GetSystemTimeAsFileTime(time *Filetime) {
+	Syscall(procGetSystemTimeAsFileTime, uintptr(unsafe.Pointer(time)), 0, 0)
+	return
+}

src/pkg/syscall/ztypes_mingw_386.go

@@ -80,6 +80,8 @@ const (
 	FORMAT_MESSAGE_MAX_WIDTH_MASK  = 255
 
 	MAX_PATH = 260
+
+	MAX_COMPUTERNAME_LENGTH = 15
 )
 
 // Types
@@ -92,6 +94,7 @@ type _C_long int32
 
 type _C_long_long int64
 
+// Invented values to support what package os expects.
 type Timeval struct {
 	Sec  int32
 	Usec int32
@@ -123,6 +126,20 @@ type Win32finddata struct {
 	AlternateFileName [13]uint16
 }
 
+type ByHandleFileInformation struct {
+	FileAttributes     uint32
+	CreationTime       Filetime
+	LastAccessTime     Filetime
+	LastWriteTime      Filetime
+	VolumeSerialNumber uint32
+	FileSizeHigh       uint32
+	FileSizeLow        uint32
+	NumberOfLinks      uint32
+	FileIndexHigh      uint32
+	FileIndexLow       uint32
+}
+
+// Invented values to support what package os expects.
 type Stat_t struct {
 	Windata Win32finddata
 	Mode    uint32