Incomplete Windows daemon support

daemon/2server-pidToPath-Windows.go

@@ -0,0 +1,29 @@
+//go:build windows
+
+package daemon
+
+import (
+	"log"
+	"syscall"
+
+	"golang.org/x/sys/windows"
+)
+
+// pidToPath returns the path of the executable that has the given PID.
+func pidToPath(pid uint32) string {
+	// get a handle to the process
+	const PROCESS_QUERY_INFORMATION = 0x0400
+	const PROCESS_VM_READ = 0x0010
+	hProcess, err := windows.OpenProcess(PROCESS_QUERY_INFORMATION|PROCESS_VM_READ, false, pid)
+	if err != nil {
+		log.Fatalf("Failed to open process %d: %v", pid, err)
+	}
+	defer windows.CloseHandle(hProcess)
+
+	// query the process executable path
+	var pathBuf [syscall.MAX_PATH]uint16
+	pathLen := uint32(len(pathBuf))
+	windows.QueryFullProcessImageName(hProcess, 0, &pathBuf[0], &pathLen)
+
+	return syscall.UTF16ToString(pathBuf[:pathLen])
+}