headers: call per-scrape native functions with SyscallN (#2746)

Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>

internal/headers/wtsapi32/wtsapi32_test.go

@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: Apache-2.0
+//
+// Copyright The Prometheus Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build windows
+
+package wtsapi32_test
+
+import (
+	"log/slog"
+	"testing"
+
+	"github.com/prometheus-community/windows_exporter/internal/headers/wtsapi32"
+	"github.com/stretchr/testify/require"
+)
+
+func TestWTSEnumerateSessionsEx(t *testing.T) {
+	t.Parallel()
+
+	server, err := wtsapi32.WTSOpenServer("")
+	require.NoError(t, err)
+
+	t.Cleanup(func() { wtsapi32.WTSCloseServer(server) })
+
+	sessions, err := wtsapi32.WTSEnumerateSessionsEx(server, slog.New(slog.DiscardHandler))
+	require.NoError(t, err)
+	require.NotEmpty(t, sessions, "session 0 always exists")
+}
+
+func BenchmarkWTSEnumerateSessionsEx(b *testing.B) {
+	server, err := wtsapi32.WTSOpenServer("")
+	require.NoError(b, err)
+
+	b.Cleanup(func() { wtsapi32.WTSCloseServer(server) })
+
+	logger := slog.New(slog.DiscardHandler)
+
+	b.ReportAllocs()
+
+	for b.Loop() {
+		_, _ = wtsapi32.WTSEnumerateSessionsEx(server, logger)
+	}
+}