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

package socktest

import "syscall"

// Accept4 wraps syscall.Accept4.
func (sw *Switch) Accept4(s, flags int) (ns int, sa syscall.Sockaddr, err error) {
	so := sw.sockso(s)
	if so == nil {
		return syscall.Accept4(s, flags)
	}
	sw.fmu.RLock()
	f := sw.fltab[FilterAccept]
	sw.fmu.RUnlock()

	af, err := f.apply(so)
	if err != nil {

// We require Linux kernel version 2.6.32. The accept4 system call was
// added in version 2.6.28, so in general we can use accept4.
// Unfortunately, for ARM only, accept4 was added in version 2.6.36.
// Handle that case here, by using a copy of the Accept function that
// we used in Go 1.17.

//go:build linux && arm

package syscall

//sys	accept(s int, rsa *RawSockaddrAny, addrlen *_Socklen) (fd int, err error)

// This file implements accept for platforms that provide a fast path for
// setting SetNonblock and CloseOnExec, but don't necessarily have accept4.
// This is the code we used for accept in Go 1.17 and earlier.
// On Linux the accept4 system call was introduced in 2.6.28 kernel,
// and our minimum requirement is 2.6.32, so we simplified the function.
// Unfortunately, on ARM accept4 wasn't added until 2.6.36, so for ARM

// 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, but don't necessarily have accept4.
// The accept4(3c) function was added to Oracle Solaris in the Solaris 11.4.0
// release. Thus, on releases prior to 11.4, we fall back to the combination
// of accept(3c) and fcntl(2).

package poll

import (
	"internal/syscall/unix"

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

package poll

import "syscall"

// Accept4Func is used to hook the accept4 call.

	iovecs := bytes2iovec(iovs)
	n, err = pwritev(fd, iovecs, off)
	return n, err
}

//sys	accept4(s int, rsa *RawSockaddrAny, addrlen *_Socklen, flags int) (fd int, err error) = libsocket.accept4

func Accept4(fd int, flags int) (nfd int, sa Sockaddr, err error) {
	var rsa RawSockaddrAny
	var len _Socklen = SizeofSockaddrAny
	nfd, err = accept4(fd, &rsa, &len, flags)
	if err != nil {
		return
	}
	if len > SizeofSockaddrAny {

		}
		return major > 11 || (major == 11 && minor >= 4)
	}
	return false
})

// SupportAccept4 tests whether accept4 system call is available.
var SupportAccept4 = sync.OnceValue(func() bool {
	for {
		// Test if the accept4() is available.
		_, _, err := syscall.Accept4(0, syscall.SOCK_NONBLOCK|syscall.SOCK_CLOEXEC)
		if err == syscall.EINTR {
			continue
		}
		return err != syscall.ENOSYS
	}
})

// license that can be found in the LICENSE file.

// This file provides the Accept function used on all systems
// other than arm. See syscall_linux_accept.go for why.

//go:build linux && !arm

package syscall

func Accept(fd int) (nfd int, sa Sockaddr, err error) {
	var rsa RawSockaddrAny
	var len _Socklen = SizeofSockaddrAny
	nfd, err = accept4(fd, &rsa, &len, 0)
	if err != nil {
		return
	}
	sa, err = anyToSockaddr(&rsa)

// 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
// descriptor as nonblocking and close-on-exec.
func accept(s int) (int, syscall.Sockaddr, string, error) {

}

var (
	// Placeholders for saving original socket system calls.
	origAccept4 = poll.Accept4Func
)

func installAccept4TestHook() {
	poll.Accept4Func = sw.Accept4
}

func uninstallAccept4TestHook() {
	poll.Accept4Func = origAccept4