// error.
// It can return a non-nil [AfterFilter] for filtering after the
// execution of the system call.
type Filter func(*Status) (AfterFilter, error)

func (f Filter) apply(st *Status) (AfterFilter, error) {
	if f == nil {
		return nil, nil
	}
	return f(st)
}

// An AfterFilter represents a socket system call filter after an
// execution of a system call.
//

				socketFunc(family, syscall.SOCK_STREAM, syscall.IPPROTO_TCP)
			}
		}()
	}
	wg.Wait()
}

func TestSocket(t *testing.T) {
	for _, f := range []socktest.Filter{
		func(st *socktest.Status) (socktest.AfterFilter, error) { return nil, nil },
		nil,
	} {
		sw.Set(socktest.FilterSocket, f)
		for _, family := range []int{syscall.AF_INET, syscall.AF_INET6} {
			socketFunc(family, syscall.SOCK_STREAM, syscall.IPPROTO_TCP)
		}
	}

func enableSocketConnect() {
	sw.Set(socktest.FilterConnect, nil)
}

func disableSocketConnect(network string) {
	net, _, _ := strings.Cut(network, ":")
	sw.Set(socktest.FilterConnect, func(so *socktest.Status) (socktest.AfterFilter, error) {
		switch net {
		case "tcp4":
			if so.Cookie.Family() == syscall.AF_INET && so.Cookie.Type() == syscall.SOCK_STREAM {
				return nil, syscall.EHOSTUNREACH
			}
		case "udp4":

		return nil, &DNSError{Err: "dial error test", Name: "name", Server: "server", IsTimeout: true}
	}
	sw.Set(socktest.FilterConnect, func(so *socktest.Status) (socktest.AfterFilter, error) {
		return nil, errOpNotSupported
	})
	defer sw.Set(socktest.FilterConnect, nil)

	d := Dialer{Timeout: someTimeout}
	for i, tt := range dialErrorTests {
		i, tt := i, tt

	syserr := make(chan error)
	go func() {
		defer close(syserr)
		for _, err := range abortedConnRequestErrors {
			syserr <- err
		}
	}()
	sw.Set(socktest.FilterAccept, func(so *socktest.Status) (socktest.AfterFilter, error) {
		if err, ok := <-syserr; ok {
			return nil, err
		}
		return nil, nil
	})
	defer sw.Set(socktest.FilterAccept, nil)

	operr := make(chan error, 1)

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