whatcanGOwrong

go/pkg/mod/github.com/cilium/ebpf@v0.11.0/internal/testutils/fdtrace/fd.go

@@ -0,0 +1,34 @@
+package fdtrace
+
+import (
+	"fmt"
+	"os"
+	"runtime"
+	"testing"
+
+	"github.com/cilium/ebpf/internal/sys"
+)
+
+// TestMain runs m with sys.FD leak tracing enabled.
+func TestMain(m *testing.M) {
+	// fn can either be invoked asynchronously by the gc or during disabling of
+	// the leak tracer below. Don't terminate the program immediately, instead
+	// capture a boolean that will be used to set the exit code. This avoids races
+	// and gives all events the chance to be written to stderr.
+	var leak bool
+	sys.OnLeakFD(func(fs *runtime.Frames) {
+		fmt.Fprintln(os.Stderr, "leaked fd created at:")
+		fmt.Fprintln(os.Stderr, sys.FormatFrames(fs))
+		leak = true
+	})
+
+	ret := m.Run()
+
+	sys.OnLeakFD(nil)
+
+	if leak {
+		ret = 99
+	}
+
+	os.Exit(ret)
+}