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windows: correct signature of recently added GetWindowThreadProcessId

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This function returns 0 and sets last error on failure. While this isn't
said explicitly on MSDN, there's no PID 0, and trivial reverse
engineering shows that this is the case. For example:

.text:00000001800035ED loc_1800035ED:                          ; CODE XREF: GetWindowThreadProcessId+23↑j
.text:00000001800035ED                                         ; GetWindowThreadProcessId+3D↑j ...
.text:00000001800035ED                 mov     ecx, 578h       ; LastError
.text:00000001800035F2                 call    cs:__imp_RtlSetLastWin32Error
.text:00000001800035F9                 nop     dword ptr [rax+rax+00h]
.text:00000001800035FE
.text:00000001800035FE loc_1800035FE:                          ; CODE XREF: GetWindowThreadProcessId+65↑j
.text:00000001800035FE                 xor     eax, eax
.text:0000000180003600                 jmp     short loc_1800035AA

This function was also just added by a user who is likely its only
consumer, so this error is not too late to fix.

Change-Id: I5dd24e78c006686bb8f1288ad0fe63cd67df56a6
Reviewed-on: https://go-review.googlesource.com/c/sys/+/285272
Trust: Jason A. Donenfeld <Jason@zx2c4.com>
Trust: Alex Brainman <alex.brainman@gmail.com>
Run-TryBot: Jason A. Donenfeld <Jason@zx2c4.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Alex Brainman <alex.brainman@gmail.com>
This commit is contained in:
Jason A. Donenfeld
2021-01-22 09:31:01 +00:00
parent b64e53b001
commit 04d7465088
2 changed files with 6 additions and 3 deletions
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windows/zsyscall_windows.go
+5 -2
View File
@@ -2904,9 +2904,12 @@ func GetShellWindow() (shellWindow HWND) {
return
}
func GetWindowThreadProcessId(hwnd HWND, pid *uint32) (tid uint32) {
r0, _, _ := syscall.Syscall(procGetWindowThreadProcessId.Addr(), 2, uintptr(hwnd), uintptr(unsafe.Pointer(pid)), 0)
func GetWindowThreadProcessId(hwnd HWND, pid *uint32) (tid uint32, err error) {
r0, _, e1 := syscall.Syscall(procGetWindowThreadProcessId.Addr(), 2, uintptr(hwnd), uintptr(unsafe.Pointer(pid)), 0)
tid = uint32(r0)
if tid == 0 {
err = errnoErr(e1)
}
return
}