syscall: restore broken GetQueuedCompletionStatus signature but make it not crash

This reverts commit dc4698f52b5ad3f0251e0cc25bc7ffbd10e23f2c, and then
fixes the memory corruption issue. It also suggests users switch to
x/sys/windows for the proper function.

This requires CL 295174 to be submitted first.

Updates #44538.

Change-Id: I0ee602f1c1d6a89cc585aff426833a4cb3f2be50
Reviewed-on: https://go-review.googlesource.com/c/go/+/296149
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Trust: Bryan C. Mills <bcmills@google.com>
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>

3 files changed, 31 insertions, 12 deletions

diff --git a/api/except.txt b/api/except.txt
index 1ddc397d11..6f6f839ba6 100644
--- a/api/except.txt
+++ b/api/except.txt
@@ -471,9 +471,6 @@ pkg syscall (openbsd-amd64-cgo), type Statfs_t struct, Pad_cgo_1 [4]uint8
 pkg syscall (openbsd-amd64-cgo), type Timespec struct, Pad_cgo_0 [4]uint8
 pkg syscall (openbsd-amd64-cgo), type Timespec struct, Sec int32
 pkg syscall (windows-386), const TOKEN_ALL_ACCESS = 983295
-pkg syscall (windows-386), func CreateIoCompletionPort(Handle, Handle, uint32, uint32) (Handle, error)
-pkg syscall (windows-386), func GetQueuedCompletionStatus(Handle, *uint32, *uint32, **Overlapped, uint32) error
-pkg syscall (windows-386), func PostQueuedCompletionStatus(Handle, uint32, uint32, *Overlapped) error
 pkg syscall (windows-386), type AddrinfoW struct, Addr uintptr
 pkg syscall (windows-386), type CertChainPolicyPara struct, ExtraPolicyPara uintptr
 pkg syscall (windows-386), type CertChainPolicyStatus struct, ExtraPolicyStatus uintptr
@@ -483,9 +480,6 @@ pkg syscall (windows-386), type CertRevocationInfo struct, OidSpecificInfo uintp
 pkg syscall (windows-386), type CertSimpleChain struct, TrustListInfo uintptr
 pkg syscall (windows-386), type RawSockaddrAny struct, Pad [96]int8
 pkg syscall (windows-amd64), const TOKEN_ALL_ACCESS = 983295
-pkg syscall (windows-amd64), func CreateIoCompletionPort(Handle, Handle, uint32, uint32) (Handle, error)
-pkg syscall (windows-amd64), func GetQueuedCompletionStatus(Handle, *uint32, *uint32, **Overlapped, uint32) error
-pkg syscall (windows-amd64), func PostQueuedCompletionStatus(Handle, uint32, uint32, *Overlapped) error
 pkg syscall (windows-amd64), type AddrinfoW struct, Addr uintptr
 pkg syscall (windows-amd64), type CertChainPolicyPara struct, ExtraPolicyPara uintptr
 pkg syscall (windows-amd64), type CertChainPolicyStatus struct, ExtraPolicyStatus uintptr
diff --git a/src/syscall/syscall_windows.go b/src/syscall/syscall_windows.go
index a958f7aa84..5310f2da80 100644
--- a/src/syscall/syscall_windows.go
+++ b/src/syscall/syscall_windows.go
@@ -213,9 +213,9 @@ func NewCallbackCDecl(fn interface{}) uintptr {
 //sys	SetEndOfFile(handle Handle) (err error)
 //sys	GetSystemTimeAsFileTime(time *Filetime)
 //sys	GetTimeZoneInformation(tzi *Timezoneinformation) (rc uint32, err error) [failretval==0xffffffff]
-//sys	CreateIoCompletionPort(filehandle Handle, cphandle Handle, key uintptr, threadcnt uint32) (handle Handle, err error)
-//sys	GetQueuedCompletionStatus(cphandle Handle, qty *uint32, key *uintptr, overlapped **Overlapped, timeout uint32) (err error)
-//sys	PostQueuedCompletionStatus(cphandle Handle, qty uint32, key uintptr, overlapped *Overlapped) (err error)
+//sys	createIoCompletionPort(filehandle Handle, cphandle Handle, key uintptr, threadcnt uint32) (handle Handle, err error) = CreateIoCompletionPort
+//sys	getQueuedCompletionStatus(cphandle Handle, qty *uint32, key *uintptr, overlapped **Overlapped, timeout uint32) (err error) = GetQueuedCompletionStatus
+//sys	postQueuedCompletionStatus(cphandle Handle, qty uint32, key uintptr, overlapped *Overlapped) (err error) = PostQueuedCompletionStatus
 //sys	CancelIo(s Handle) (err error)
 //sys	CancelIoEx(s Handle, o *Overlapped) (err error)
 //sys	CreateProcess(appName *uint16, commandLine *uint16, procSecurity *SecurityAttributes, threadSecurity *SecurityAttributes, inheritHandles bool, creationFlags uint32, env *uint16, currentDir *uint16, startupInfo *StartupInfo, outProcInfo *ProcessInformation) (err error) = CreateProcessW
@@ -1212,3 +1212,28 @@ func Readlink(path string, buf []byte) (n int, err error) {
 
 	return n, nil
 }
+
+// Deprecated: CreateIoCompletionPort has the wrong function signature. Use x/sys/windows.CreateIoCompletionPort.
+func CreateIoCompletionPort(filehandle Handle, cphandle Handle, key uint32, threadcnt uint32) (Handle, error) {
+	return createIoCompletionPort(filehandle, cphandle, uintptr(key), threadcnt)
+}
+
+// Deprecated: GetQueuedCompletionStatus has the wrong function signature. Use x/sys/windows.GetQueuedCompletionStatus.
+func GetQueuedCompletionStatus(cphandle Handle, qty *uint32, key *uint32, overlapped **Overlapped, timeout uint32) error {
+	var ukey uintptr
+	var pukey *uintptr
+	if key != nil {
+		ukey = uintptr(*key)
+		pukey = &ukey
+	}
+	err := getQueuedCompletionStatus(cphandle, qty, pukey, overlapped, timeout)
+	if key != nil {
+		*key = uint32(ukey)
+	}
+	return err
+}
+
+// Deprecated: PostQueuedCompletionStatus has the wrong function signature. Use x/sys/windows.PostQueuedCompletionStatus.
+func PostQueuedCompletionStatus(cphandle Handle, qty uint32, key uint32, overlapped *Overlapped) error {
+	return postQueuedCompletionStatus(cphandle, qty, uintptr(key), overlapped)
+}
diff --git a/src/syscall/zsyscall_windows.go b/src/syscall/zsyscall_windows.go
index cc44e31a85..b1480ba7df 100644
--- a/src/syscall/zsyscall_windows.go
+++ b/src/syscall/zsyscall_windows.go
@@ -515,7 +515,7 @@ func CreateHardLink(filename *uint16, existingfilename *uint16, reserved uintptr
 	return
 }
 
-func CreateIoCompletionPort(filehandle Handle, cphandle Handle, key uintptr, threadcnt uint32) (handle Handle, err error) {
+func createIoCompletionPort(filehandle Handle, cphandle Handle, key uintptr, threadcnt uint32) (handle Handle, err error) {
 	r0, _, e1 := Syscall6(procCreateIoCompletionPort.Addr(), 4, uintptr(filehandle), uintptr(cphandle), uintptr(key), uintptr(threadcnt), 0, 0)
 	handle = Handle(r0)
 	if handle == 0 {
@@ -822,7 +822,7 @@ func GetProcessTimes(handle Handle, creationTime *Filetime, exitTime *Filetime,
 	return
 }
 
-func GetQueuedCompletionStatus(cphandle Handle, qty *uint32, key *uintptr, overlapped **Overlapped, timeout uint32) (err error) {
+func getQueuedCompletionStatus(cphandle Handle, qty *uint32, key *uintptr, overlapped **Overlapped, timeout uint32) (err error) {
 	r1, _, e1 := Syscall6(procGetQueuedCompletionStatus.Addr(), 5, uintptr(cphandle), uintptr(unsafe.Pointer(qty)), uintptr(unsafe.Pointer(key)), uintptr(unsafe.Pointer(overlapped)), uintptr(timeout), 0)
 	if r1 == 0 {
 		err = errnoErr(e1)
@@ -954,7 +954,7 @@ func OpenProcess(da uint32, inheritHandle bool, pid uint32) (handle Handle, err
 	return
 }
 
-func PostQueuedCompletionStatus(cphandle Handle, qty uint32, key uintptr, overlapped *Overlapped) (err error) {
+func postQueuedCompletionStatus(cphandle Handle, qty uint32, key uintptr, overlapped *Overlapped) (err error) {
 	r1, _, e1 := Syscall6(procPostQueuedCompletionStatus.Addr(), 4, uintptr(cphandle), uintptr(qty), uintptr(key), uintptr(unsafe.Pointer(overlapped)), 0, 0)
 	if r1 == 0 {
 		err = errnoErr(e1)