// a go.mod file in the current directory or any parent. If none is found,
	// modules may be disabled (GO111MODULE=auto) or commands may run in a
	// limited module mode.
	AutoRoot Root = iota

	// NoRoot is used for commands that run in module mode and ignore any go.mod
	// file the current directory or in parent directories.
	NoRoot

const (
	zero form = iota
	finite
	inf
)

// RoundingMode determines how a [Float] value is rounded to the
// desired precision. Rounding may change the [Float] value; the
// rounding error is described by the [Float]'s [Accuracy].
type RoundingMode byte

// These constants define supported rounding modes.
const (
	ToNearestEven RoundingMode = iota // == IEEE 754-2008 roundTiesToEven

}

// gcState is a trinary variable for the current state of the GC.
//
// The third state besides "enabled" and "disabled" is "undetermined."
type gcState uint8

const (
	gcUndetermined gcState = iota
	gcNotRunning
	gcRunning
)

// String returns a human-readable string for the GC state.
func (s gcState) String() string {
	switch s {
	case gcUndetermined:
		return "Undetermined"

	// lookup per module, and we don't want to load information that's neither
	// relevant nor actionable.
	type modFlags int
	const (
		resolved modFlags = 1 << iota // version resolved by 'go get'
		named                         // explicitly named on command line or provides a named package
		hasPkg                        // needed to build named packages

//	varkill - killed by the instruction (set)
//
// A kill happens after the use (for an instruction that updates a value, for example).
type liveEffect int

const (
	uevar liveEffect = 1 << iota
	varkill
)

// valueEffects returns the index of a variable in lv.vars and the
// liveness effects v has on that variable.
// If v does not affect any tracked variables, it returns -1, 0.

	if s.softFloat {
		if c, ok := s.sfcall(op, arg0, arg1); ok {
			return c
		}
	}
	return s.newValue2(op, t, arg0, arg1)
}

type instrumentKind uint8

const (
	instrumentRead = iota
	instrumentWrite
	instrumentMove
)

func (s *state) instrument(t *types.Type, addr *ssa.Value, kind instrumentKind) {
	s.instrument2(t, addr, nil, kind)
}

const (
	// StateNew represents a new connection that is expected to
	// send a request immediately. Connections begin at this
	// state and then transition to either StateActive or
	// StateClosed.
	StateNew ConnState = iota

	// StateActive represents a connection that has read 1 or more
	// bytes of a request. The Server.ConnState hook for
	// StateActive fires before the request has entered a handler

	if e != nil {
		return nil, &PathError{Op: "fork/exec", Path: name, Err: e}
	}

	return newPIDProcess(pid), nil
}

func (p *Process) writeProcFile(file string, data string) error {
	f, e := OpenFile("/proc/"+itoa.Itoa(p.Pid)+"/"+file, O_WRONLY, 0)
	if e != nil {
		return e
	}
	defer f.Close()
	_, e = f.Write([]byte(data))
	return e
}

func (p *Process) signal(sig Signal) error {
	switch p.pidStatus() {

// https://lists.w3.org/Archives/Public/ietf-http-wg/2016JulSep/0599.html
//
// "reserved (remote)" is omitted since the client code does not
// support server push.
const (
	http2stateIdle http2streamState = iota
	http2stateOpen
	http2stateHalfClosedLocal
	http2stateHalfClosedRemote
	http2stateClosed
)

var http2stateName = [...]string{
	http2stateIdle:             "Idle",

}

func queryCS1(ctx context.Context, net string, ip IP, port int) (clone, dest string, err error) {
	ips := "*"
	if len(ip) != 0 && !ip.IsUnspecified() {
		ips = ip.String()
	}
	lines, err := queryCS(ctx, net, ips, itoa.Itoa(port))
	if err != nil {
		return
	}
	f := getFields(lines[0])
	if len(f) < 2 {
		return "", "", errors.New("bad response from ndb/cs")
	}
	clone, dest = f[0], f[1]
	return
}