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syscall: revert API changes in Windows Win32finddata fix.

Browse source 
Preserve old API by using correct struct in system call
and then copying the results, as we did for SetsockoptLinger.

R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/6307065
This commit is contained in:
Russ Cox 2012-06-08 13:54:48 -04:00
parent 0c2f0cca7c
commit 7ad37673e1
6 changed files with 49 additions and 42 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

26
api/next.txt
View file

@ -422,38 +422,12 @@ pkg syscall (darwin-amd64-cgo), type Termios struct, Pad_cgo_0 [4]byte
pkg syscall (windows-386), const CREATE_NEW_PROCESS_GROUP ideal-int
pkg syscall (windows-386), const CTRL_BREAK_EVENT ideal-int
pkg syscall (windows-386), const CTRL_C_EVENT ideal-int
pkg syscall (windows-386), func FindFirstFile1(*uint16, *Win32finddata1) (Handle, error)
pkg syscall (windows-386), func FindNextFile1(Handle, *Win32finddata1) error
pkg syscall (windows-386), func GetCurrentProcessId() uint32
pkg syscall (windows-386), func Getsockopt(Handle, int32, int32, *byte, *int32) error
pkg syscall (windows-386), type SysProcAttr struct, CreationFlags uint32
pkg syscall (windows-386), type Win32finddata1 struct
pkg syscall (windows-386), type Win32finddata1 struct, AlternateFileName [14]uint16
pkg syscall (windows-386), type Win32finddata1 struct, CreationTime Filetime
pkg syscall (windows-386), type Win32finddata1 struct, FileAttributes uint32
pkg syscall (windows-386), type Win32finddata1 struct, FileName [MAX_PATH]uint16
pkg syscall (windows-386), type Win32finddata1 struct, FileSizeHigh uint32
pkg syscall (windows-386), type Win32finddata1 struct, FileSizeLow uint32
pkg syscall (windows-386), type Win32finddata1 struct, LastAccessTime Filetime
pkg syscall (windows-386), type Win32finddata1 struct, LastWriteTime Filetime
pkg syscall (windows-386), type Win32finddata1 struct, Reserved0 uint32
pkg syscall (windows-386), type Win32finddata1 struct, Reserved1 uint32
pkg syscall (windows-amd64), const CREATE_NEW_PROCESS_GROUP ideal-int
pkg syscall (windows-amd64), const CTRL_BREAK_EVENT ideal-int
pkg syscall (windows-amd64), const CTRL_C_EVENT ideal-int
pkg syscall (windows-amd64), func FindFirstFile1(*uint16, *Win32finddata1) (Handle, error)
pkg syscall (windows-amd64), func FindNextFile1(Handle, *Win32finddata1) error
pkg syscall (windows-amd64), func GetCurrentProcessId() uint32
pkg syscall (windows-amd64), func Getsockopt(Handle, int32, int32, *byte, *int32) error
pkg syscall (windows-amd64), type SysProcAttr struct, CreationFlags uint32
pkg syscall (windows-amd64), type Win32finddata1 struct
pkg syscall (windows-amd64), type Win32finddata1 struct, AlternateFileName [14]uint16
pkg syscall (windows-amd64), type Win32finddata1 struct, CreationTime Filetime
pkg syscall (windows-amd64), type Win32finddata1 struct, FileAttributes uint32
pkg syscall (windows-amd64), type Win32finddata1 struct, FileName [MAX_PATH]uint16
pkg syscall (windows-amd64), type Win32finddata1 struct, FileSizeHigh uint32
pkg syscall (windows-amd64), type Win32finddata1 struct, FileSizeLow uint32
pkg syscall (windows-amd64), type Win32finddata1 struct, LastAccessTime Filetime
pkg syscall (windows-amd64), type Win32finddata1 struct, LastWriteTime Filetime
pkg syscall (windows-amd64), type Win32finddata1 struct, Reserved0 uint32
pkg syscall (windows-amd64), type Win32finddata1 struct, Reserved1 uint32

6
src/pkg/os/file_windows.go
View file

@ -50,7 +50,7 @@ func NewFile(fd uintptr, name string) *File {
// Auxiliary information if the File describes a directory
type dirInfo struct {
data syscall.Win32finddata1
data syscall.Win32finddata
needdata bool
path string
}
@ -76,7 +76,7 @@ func openFile(name string, flag int, perm FileMode) (file *File, err error) {
func openDir(name string) (file *File, err error) {
d := new(dirInfo)
r, e := syscall.FindFirstFile1(syscall.StringToUTF16Ptr(name+`\*`), &d.data)
r, e := syscall.FindFirstFile(syscall.StringToUTF16Ptr(name+`\*`), &d.data)
if e != nil {
return nil, &PathError{"open", name, e}
}
@ -159,7 +159,7 @@ func (file *File) readdir(n int) (fi []FileInfo, err error) {
d := &file.dirinfo.data
for n != 0 {
if file.dirinfo.needdata {
e := syscall.FindNextFile1(syscall.Handle(file.fd), d)
e := syscall.FindNextFile(syscall.Handle(file.fd), d)
if e != nil {
if e == syscall.ERROR_NO_MORE_FILES {
break

27
src/pkg/syscall/syscall_windows.go
View file

@ -7,7 +7,6 @@
package syscall
import (
errorspkg "errors"
"unicode/utf16"
"unsafe"
)
@ -130,8 +129,8 @@ func NewCallback(fn interface{}) uintptr
//sys SetFilePointer(handle Handle, lowoffset int32, highoffsetptr *int32, whence uint32) (newlowoffset uint32, err error) [failretval==0xffffffff]
//sys CloseHandle(handle Handle) (err error)
//sys GetStdHandle(stdhandle int) (handle Handle, err error) [failretval==InvalidHandle]
//sys FindFirstFile1(name *uint16, data *Win32finddata1) (handle Handle, err error) [failretval==InvalidHandle] = FindFirstFileW
//sys FindNextFile1(handle Handle, data *Win32finddata1) (err error) = FindNextFileW
//sys findFirstFile1(name *uint16, data *win32finddata1) (handle Handle, err error) [failretval==InvalidHandle] = FindFirstFileW
//sys findNextFile1(handle Handle, data *win32finddata1) (err error) = FindNextFileW
//sys FindClose(handle Handle) (err error)
//sys GetFileInformationByHandle(handle Handle, data *ByHandleFileInformation) (err error)
//sys GetCurrentDirectory(buflen uint32, buf *uint16) (n uint32, err error) = GetCurrentDirectoryW
@ -706,11 +705,29 @@ func SetsockoptIPv6Mreq(fd Handle, level, opt int, mreq *IPv6Mreq) (err error) {
func Getpid() (pid int) { return int(GetCurrentProcessId()) }
func FindFirstFile(name *uint16, data *Win32finddata) (handle Handle, err error) {
return InvalidHandle, errorspkg.New("FindFirstFile is broken, use FindFirstFile1 instead")
// NOTE(rsc): The Win32finddata struct is wrong for the system call:
// the two paths are each one uint16 short. Use the correct struct,
// a win32finddata1, and then copy the results out.
// There is no loss of expressivity here, because the final
// uint16, if it is used, is supposed to be a NUL, and Go doesn't need that.
// For Go 1.1, we might avoid the allocation of win32finddata1 here
// by adding a final Bug [2]uint16 field to the struct and then
// adjusting the fields in the result directly.
var data1 win32finddata1
handle, err = findFirstFile1(name, &data1)
if err == nil {
copyFindData(data, &data1)
}
return
}
func FindNextFile(handle Handle, data *Win32finddata) (err error) {
return errorspkg.New("FindNextFile is broken, use FindNextFile1 instead")
var data1 win32finddata1
err = findNextFile1(handle, &data1)
if err == nil {
copyFindData(data, &data1)
}
return
}
// TODO(brainman): fix all needed for os

4
src/pkg/syscall/zsyscall_windows_386.go
View file

@ -310,7 +310,7 @@ func GetStdHandle(stdhandle int) (handle Handle, err error) {
return
}
func FindFirstFile1(name *uint16, data *Win32finddata1) (handle Handle, err error) {
func findFirstFile1(name *uint16, data *win32finddata1) (handle Handle, err error) {
r0, _, e1 := Syscall(procFindFirstFileW.Addr(), 2, uintptr(unsafe.Pointer(name)), uintptr(unsafe.Pointer(data)), 0)
handle = Handle(r0)
if handle == InvalidHandle {
@ -323,7 +323,7 @@ func FindFirstFile1(name *uint16, data *Win32finddata1) (handle Handle, err erro
return
}
func FindNextFile1(handle Handle, data *Win32finddata1) (err error) {
func findNextFile1(handle Handle, data *win32finddata1) (err error) {
r1, _, e1 := Syscall(procFindNextFileW.Addr(), 2, uintptr(handle), uintptr(unsafe.Pointer(data)), 0)
if int(r1) == 0 {
if e1 != 0 {

4
src/pkg/syscall/zsyscall_windows_amd64.go
View file

@ -310,7 +310,7 @@ func GetStdHandle(stdhandle int) (handle Handle, err error) {
return
}
func FindFirstFile1(name *uint16, data *Win32finddata1) (handle Handle, err error) {
func findFirstFile1(name *uint16, data *win32finddata1) (handle Handle, err error) {
r0, _, e1 := Syscall(procFindFirstFileW.Addr(), 2, uintptr(unsafe.Pointer(name)), uintptr(unsafe.Pointer(data)), 0)
handle = Handle(r0)
if handle == InvalidHandle {
@ -323,7 +323,7 @@ func FindFirstFile1(name *uint16, data *Win32finddata1) (handle Handle, err erro
return
}
func FindNextFile1(handle Handle, data *Win32finddata1) (err error) {
func findNextFile1(handle Handle, data *win32finddata1) (err error) {
r1, _, e1 := Syscall(procFindNextFileW.Addr(), 2, uintptr(handle), uintptr(unsafe.Pointer(data)), 0)
if int(r1) == 0 {
if e1 != 0 {

24
src/pkg/syscall/ztypes_windows.go
View file

@ -338,9 +338,6 @@ func NsecToFiletime(nsec int64) (ft Filetime) {
return ft
}
// Win32finddata is an incorrect struct definition, preserved for
// backwards compatibility. Use Win32finddata1 and the
// FindFirstFile1 and FindNextFile1 functions instead.
type Win32finddata struct {
FileAttributes uint32
CreationTime Filetime
@ -354,7 +351,9 @@ type Win32finddata struct {
AlternateFileName [13]uint16
}
type Win32finddata1 struct {
// This is the actual system call structure.
// Win32finddata is what we committed to in Go 1.
type win32finddata1 struct {
FileAttributes uint32
CreationTime Filetime
LastAccessTime Filetime
@ -367,6 +366,23 @@ type Win32finddata1 struct {
AlternateFileName [14]uint16
}
func copyFindData(dst *Win32finddata, src *win32finddata1) {
dst.FileAttributes = src.FileAttributes
dst.CreationTime = src.CreationTime
dst.LastAccessTime = src.LastAccessTime
dst.LastWriteTime = src.LastWriteTime
dst.FileSizeHigh = src.FileSizeHigh
dst.FileSizeLow = src.FileSizeLow
dst.Reserved0 = src.Reserved0
dst.Reserved1 = src.Reserved1
// The src is 1 element shorter than dst. Zero that last one.
copy(dst.FileName[:], src.FileName[:])
dst.FileName[len(dst.FileName)-1] = 0
copy(dst.AlternateFileName[:], src.AlternateFileName[:])
src.AlternateFileName[len(dst.AlternateFileName)-1] = 0
}
type ByHandleFileInformation struct {
FileAttributes uint32
CreationTime Filetime