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windows: add LockFileEx, UnlockFileEx system calls

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Changes in syscall_windows.go were copied from
internal/syscall/syscall_windows.go.

zsyscall_windows.go was regenerated by running
'go generate -tags=generate golang.org/x/sys/windows'
using a toolchain built from tip (after CL 196122).

These functions are called by cmd/go/internal/lockedfile via
internal/syscall/windows. I'd like to copy lockedfile into another
project (CL 197299), but these functions need to be exposed here in
order to do so. We may need these in x/mod eventually, too.

Change-Id: I2033106d2ba65009e764591bfe5702f4d41dffdd
Reviewed-on: https://go-review.googlesource.com/c/sys/+/198060
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jason A. Donenfeld <Jason@zx2c4.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
This commit is contained in:
Jay Conrod
2019-09-30 15:06:52 -04:00
committed by Jason A. Donenfeld
parent c990c680b6
commit bb3f8db39f
2 changed files with 32 additions and 0 deletions
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6
windows/syscall_windows.go
View File

@@ -57,6 +57,10 @@ const (
FILE_VOLUME_IS_COMPRESSED = 0x00008000
FILE_VOLUME_QUOTAS = 0x00000020
// Flags for LockFileEx.
LOCKFILE_FAIL_IMMEDIATELY = 0x00000001
LOCKFILE_EXCLUSIVE_LOCK = 0x00000002
// Return values of SleepEx and other APC functions
STATUS_USER_APC = 0x000000C0
WAIT_IO_COMPLETION = STATUS_USER_APC
@@ -160,6 +164,8 @@ func NewCallbackCDecl(fn interface{}) uintptr {
//sys DeleteFile(path *uint16) (err error) = DeleteFileW
//sys MoveFile(from *uint16, to *uint16) (err error) = MoveFileW
//sys MoveFileEx(from *uint16, to *uint16, flags uint32) (err error) = MoveFileExW
//sys LockFileEx(file Handle, flags uint32, reserved uint32, bytesLow uint32, bytesHigh uint32, overlapped *Overlapped) (err error)
//sys UnlockFileEx(file Handle, reserved uint32, bytesLow uint32, bytesHigh uint32, overlapped *Overlapped) (err error)
//sys GetComputerName(buf *uint16, n *uint32) (err error) = GetComputerNameW
//sys GetComputerNameEx(nametype uint32, buf *uint16, n *uint32) (err error) = GetComputerNameExW
//sys SetEndOfFile(handle Handle) (err error)

26
windows/zsyscall_windows.go
View File

@@ -101,6 +101,8 @@ var (
procDeleteFileW = modkernel32.NewProc("DeleteFileW")
procMoveFileW = modkernel32.NewProc("MoveFileW")
procMoveFileExW = modkernel32.NewProc("MoveFileExW")
procLockFileEx = modkernel32.NewProc("LockFileEx")
procUnlockFileEx = modkernel32.NewProc("UnlockFileEx")
procGetComputerNameW = modkernel32.NewProc("GetComputerNameW")
procGetComputerNameExW = modkernel32.NewProc("GetComputerNameExW")
procSetEndOfFile = modkernel32.NewProc("SetEndOfFile")
@@ -994,6 +996,30 @@ func MoveFileEx(from *uint16, to *uint16, flags uint32) (err error) {
return
}
func LockFileEx(file Handle, flags uint32, reserved uint32, bytesLow uint32, bytesHigh uint32, overlapped *Overlapped) (err error) {
r1, _, e1 := syscall.Syscall6(procLockFileEx.Addr(), 6, uintptr(file), uintptr(flags), uintptr(reserved), uintptr(bytesLow), uintptr(bytesHigh), uintptr(unsafe.Pointer(overlapped)))
if r1 == 0 {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = syscall.EINVAL
}
}
return
}
func UnlockFileEx(file Handle, reserved uint32, bytesLow uint32, bytesHigh uint32, overlapped *Overlapped) (err error) {
r1, _, e1 := syscall.Syscall6(procUnlockFileEx.Addr(), 5, uintptr(file), uintptr(reserved), uintptr(bytesLow), uintptr(bytesHigh), uintptr(unsafe.Pointer(overlapped)), 0)
if r1 == 0 {
if e1 != 0 {
err = errnoErr(e1)
} else {
err = syscall.EINVAL
}
}
return
}
func GetComputerName(buf *uint16, n *uint32) (err error) {
r1, _, e1 := syscall.Syscall(procGetComputerNameW.Addr(), 2, uintptr(unsafe.Pointer(buf)), uintptr(unsafe.Pointer(n)), 0)
if r1 == 0 {