)

// Linux stores the backlog as:
//
//   - uint16 in kernel version < 4.1,
//   - uint32 in kernel version >= 4.1
//
// Truncate number to avoid wrapping.
//
// See issue 5030 and 41470.
func maxAckBacklog(n int) int {
	major, minor := unix.KernelVersion()
	size := 16
	if major > 4 || (major == 4 && minor >= 1) {
		size = 32
	}

	var max uint = 1<<size - 1
	if uint(n) > max {
		n = int(max)
	}

package net

import (
	"internal/syscall/unix"
	"testing"
)

func TestMaxAckBacklog(t *testing.T) {
	n := 196602
	major, minor := unix.KernelVersion()
	backlog := maxAckBacklog(n)
	expected := 1<<16 - 1
	if major > 4 || (major == 4 && minor >= 1) {
		expected = n
	}
	if backlog != expected {