// Copyright 2019 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package nettest provides utilities for network testing.
package nettest

import (
	"errors"
	"fmt"
	"net"
	"os"
	"os/exec"
	"runtime"
	"strconv"
	"strings"
	"sync"
	"time"
)

var (
	stackOnce               sync.Once
	ipv4Enabled             bool

}

// The Range interface provides a range. It's equivalent to and satisfied by
// ast.Node.
type Range interface {
	Pos() token.Pos // position of first character belonging to the node
	End() token.Pos // position of first character immediately after the node
}

// ReportRangef is a helper function that reports a Diagnostic using the
// range provided. ast.Node values can be passed in as the range because

// bits of output, their collision-resistance is only "x/2" bits.
//
// The SHAKE-256 and -128 functions have a generic security strength of 256 and
// 128 bits against all attacks, provided that at least 2x bits of their output
// is used.  Requesting more than 64 or 32 bytes of output, respectively, does
// not increase the collision-resistance of the SHAKE functions.
//
// # The sponge construction
//

// And atomically performs a bitwise AND operation on x using the bitmask
// provided as mask and returns the old value.
func (x *Int32) And(mask int32) (old int32) { return AndInt32(&x.v, mask) }

// Or atomically performs a bitwise OR operation on x using the bitmask
// provided as mask and returns the old value.
func (x *Int32) Or(mask int32) (old int32) { return OrInt32(&x.v, mask) }

		return id
	}
	t.nextExtra++
	id := t.nextExtra
	t.extraStrings = append(t.extraStrings, s)
	t.extraStringIDs[s] = id
	return id
}

// getExtraString returns the extra string for the provided ID.
// The ID must have been produced by addExtraString for this evTable.
func (t *evTable) getExtraString(id extraStringID) string {
	if id == 0 {
		return ""
	}
	return t.extraStrings[id-1]
}

### New structs package

The new [structs] package provides
types for struct fields that modify properties of
the containing struct type such as memory layout.

In this release, the only such type is
[`HostLayout`](/pkg/structs#HostLayout)
which indicates that a structure with a field of that
type has a layout that conforms to host platform

	}
	logger := log.New(logWriter, "", log.Ltime|log.Lmicroseconds|log.Lshortfile)

	// Fetch the upload config, if it is not provided.
	config, configVersion, err := configstore.Download("latest", rcfg.Env)
	if err != nil {
		return nil, err
	}

	// Set the start time, if it is not provided.
	startTime := time.Now().UTC()
	if !rcfg.StartTime.IsZero() {
		startTime = rcfg.StartTime
	}

	return &uploader{

//go:build goexperiment.arenas

package reflect

import "arena"

// ArenaNew returns a [Value] representing a pointer to a new zero value for the
// specified type, allocating storage for it in the provided arena. That is,
// the returned Value's Type is [PointerTo](typ).
func ArenaNew(a *arena.Arena, typ Type) Value {
	return ValueOf(arena_New(a, PointerTo(typ)))
}

// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Package sync provides basic synchronization primitives such as mutual
// exclusion locks. Other than the [Once] and [WaitGroup] types, most are intended
// for use by low-level library routines. Higher-level synchronization is
// better done via channels and communication.
//

// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// This file implements sysSocket for platforms that provide a fast path for
// setting SetNonblock and CloseOnExec.

//go:build dragonfly || freebsd || linux || netbsd || openbsd

package net

import (
	"os"
	"syscall"
)