if err == nil {
		syscall.CloseOnExec(s)
	}
	syscall.ForkLock.RUnlock()
	if err != nil {
		return -1, os.NewSyscallError("socket", err)
	}
	if err = syscall.SetNonblock(s, true); err != nil {
		poll.CloseFunc(s)
		return -1, os.NewSyscallError("setnonblock", err)
	}
	return s, nil

	ns, sa, err := AcceptFunc(s)
	if err == nil {
		syscall.CloseOnExec(ns)
	}
	if err != nil {
		return -1, nil, "accept", err
	}
	if err = syscall.SetNonblock(ns, true); err != nil {
		CloseFunc(ns)
		return -1, nil, "setnonblock", err
	}
	return ns, sa, "", nil

	s, call, err := poll.DupCloseOnExec(int(f.Fd()))
	if err != nil {
		if call != "" {
			err = os.NewSyscallError(call, err)
		}
		return -1, err
	}
	if err := syscall.SetNonblock(s, true); err != nil {
		poll.CloseFunc(s)
		return -1, os.NewSyscallError("setnonblock", err)
	}
	return s, nil
}

func newFileFD(f *os.File) (*netFD, error) {
	s, err := dupSocket(f)
	if err != nil {
		return nil, err
	}

// 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"
)

// Wrapper around the socket system call that marks the returned file

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Fake network poller for js/wasm.
// Should never be used, because js/wasm network connections do not honor "SetNonblock".

//go:build js && wasm

package runtime

func netpollinit() {
}

func netpollIsPollDescriptor(fd uintptr) bool {
	return false
}

func netpollopen(fd uintptr, pd *pollDesc) int32 {

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

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

//go:build dragonfly || freebsd || (linux && !arm) || netbsd || openbsd

package poll

import "syscall"

// Wrapper around the accept system call that marks the returned file

func TestReadNonblockingFd(t *testing.T) {
	switch runtime.GOOS {
	case "windows":
		t.Skip("Windows doesn't support SetNonblock")
	}
	if os.Getenv("GO_WANT_READ_NONBLOCKING_FD") == "1" {
		fd := syscallDescriptor(os.Stdin.Fd())
		syscall.SetNonblock(fd, true)
		defer syscall.SetNonblock(fd, false)
		_, err := os.Stdin.Read(make([]byte, 1))
		if err != nil {

	// runtime supports non-blocking stdio, the Go runtime is able to
	// use the WASI net poller to poll for read/write readiness and is
	// able to schedule goroutines while waiting.
	SetNonblock(0, true)
	SetNonblock(1, true)
	SetNonblock(2, true)
}

type uintptr32 = uint32
type size = uint32
type fdflags = uint32
type filesize = uint64
type filetype = uint8
type lookupflags = uint32
type oflags = uint32

		t.Fatalf("pipe: %v", err)
	}
	defer syscall.Close(p[1])

	// Set the read-side to non-blocking.
	if !blocking {
		if err := syscall.SetNonblock(p[0], true); err != nil {
			syscall.Close(p[0])
			t.Fatalf("SetNonblock: %v", err)
		}
	}
	// Convert it to a file.
	file := NewFile(uintptr(p[0]), "notapipe")
	if file == nil {
		syscall.Close(p[0])

	}
}

func TestNewFileNonBlocking(t *testing.T) {
	var p [2]int
	if err := syscall.Pipe(p[:]); err != nil {
		t.Fatal(err)
	}
	if err := syscall.SetNonblock(p[0], true); err != nil {
		t.Fatal(err)
	}
	f := os.NewFile(uintptr(p[0]), "pipe")
	nonblock, err := unix.IsNonblock(p[0])
	if err != nil {
		t.Fatal(err)
	}
	defer f.Close()
	if !nonblock {