remove support for go1.3

trap_others.go

@@ -1,3 +1,4 @@
+//go:build !windows
 // +build !windows
 
 package mousetrap

trap_windows.go

@@ -1,98 +1,42 @@
-// +build windows
-// +build !go1.4
-
 package mousetrap
 
 import (
-	"fmt"
-	"os"
 	"syscall"
 	"unsafe"
 )
 
-const (
-	// defined by the Win32 API
-	th32cs_snapprocess uintptr = 0x2
-)
-
-var (
-	kernel                   = syscall.MustLoadDLL("kernel32.dll")
-	CreateToolhelp32Snapshot = kernel.MustFindProc("CreateToolhelp32Snapshot")
-	Process32First           = kernel.MustFindProc("Process32FirstW")
-	Process32Next            = kernel.MustFindProc("Process32NextW")
-)
-
-// ProcessEntry32 structure defined by the Win32 API
-type processEntry32 struct {
-	dwSize              uint32
-	cntUsage            uint32
-	th32ProcessID       uint32
-	th32DefaultHeapID   int
-	th32ModuleID        uint32
-	cntThreads          uint32
-	th32ParentProcessID uint32
-	pcPriClassBase      int32
-	dwFlags             uint32
-	szExeFile           [syscall.MAX_PATH]uint16
-}
-
-func getProcessEntry(pid int) (pe *processEntry32, err error) {
-	snapshot, _, e1 := CreateToolhelp32Snapshot.Call(th32cs_snapprocess, uintptr(0))
-	if snapshot == uintptr(syscall.InvalidHandle) {
-		err = fmt.Errorf("CreateToolhelp32Snapshot: %v", e1)
-		return
+func getProcessEntry(pid int) (*syscall.ProcessEntry32, error) {
+	snapshot, err := syscall.CreateToolhelp32Snapshot(syscall.TH32CS_SNAPPROCESS, 0)
+	if err != nil {
+		return nil, err
 	}
-	defer syscall.CloseHandle(syscall.Handle(snapshot))
-
-	var processEntry processEntry32
-	processEntry.dwSize = uint32(unsafe.Sizeof(processEntry))
-	ok, _, e1 := Process32First.Call(snapshot, uintptr(unsafe.Pointer(&processEntry)))
-	if ok == 0 {
-		err = fmt.Errorf("Process32First: %v", e1)
-		return
+	defer syscall.CloseHandle(snapshot)
+	var procEntry syscall.ProcessEntry32
+	procEntry.Size = uint32(unsafe.Sizeof(procEntry))
+	if err = syscall.Process32First(snapshot, &procEntry); err != nil {
+		return nil, err
 	}
-
 	for {
-		if processEntry.th32ProcessID == uint32(pid) {
-			pe = &processEntry
-			return
+		if procEntry.ProcessID == uint32(pid) {
+			return &procEntry, nil
 		}
-
-		ok, _, e1 = Process32Next.Call(snapshot, uintptr(unsafe.Pointer(&processEntry)))
-		if ok == 0 {
-			err = fmt.Errorf("Process32Next: %v", e1)
-			return
+		err = syscall.Process32Next(snapshot, &procEntry)
+		if err != nil {
+			return nil, err
 		}
 	}
 }
 
-func getppid() (pid int, err error) {
-	pe, err := getProcessEntry(os.Getpid())
-	if err != nil {
-		return
-	}
-
-	pid = int(pe.th32ParentProcessID)
-	return
-}
-
 // StartedByExplorer returns true if the program was invoked by the user double-clicking
 // on the executable from explorer.exe
 //
 // It is conservative and returns false if any of the internal calls fail.
 // It does not guarantee that the program was run from a terminal. It only can tell you
 // whether it was launched from explorer.exe
 func StartedByExplorer() bool {
-	ppid, err := getppid()
+	pe, err := getProcessEntry(syscall.Getppid())
 	if err != nil {
 		return false
 	}
-
-	pe, err := getProcessEntry(ppid)
-	if err != nil {
-		return false
-	}
-
-	name := syscall.UTF16ToString(pe.szExeFile[:])
-	return name == "explorer.exe"
+	return "explorer.exe" == syscall.UTF16ToString(pe.ExeFile[:])
 }