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

//go:build darwin || zos

package unix

import "unsafe"

// ReadDirent reads directory entries from fd and writes them into buf.
func ReadDirent(fd int, buf []byte) (n int, err error) {
	// Final argument is (basep *uintptr) and the syscall doesn't take nil.
	// 64 bits should be enough. (32 bits isn't even on 386). Since the

// See go.dev/issue/67401.
//
//go:linkname overrideWrite
var overrideWrite func(fd uintptr, p unsafe.Pointer, n int32) int32

// write must be nosplit on Windows (see write1)
//
//go:nosplit
func write(fd uintptr, p unsafe.Pointer, n int32) int32 {
	if overrideWrite != nil {
		return overrideWrite(fd, noescape(p), n)
	}
	return write1(fd, p, n)

func ioctl(fd int, req uint, arg uintptr) (err error) {
	_, _, e1 := Syscall(SYS_IOCTL, uintptr(fd), uintptr(req), uintptr(arg))
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func ioctlPtr(fd int, req uint, arg unsafe.Pointer) (err error) {
	_, _, e1 := Syscall(SYS_IOCTL, uintptr(fd), uintptr(req), uintptr(arg))
	if e1 != 0 {

//go:nosplit
//go:cgo_unsafe_args
func closefd(fd int32) int32 {
	return libcCall(unsafe.Pointer(abi.FuncPCABI0(close_trampoline)), unsafe.Pointer(&fd))
}
func close_trampoline()

//go:nosplit
//go:cgo_unsafe_args
func read(fd int32, p unsafe.Pointer, n int32) int32 {
	ret := libcCall(unsafe.Pointer(abi.FuncPCABI0(read_trampoline)), unsafe.Pointer(&fd))
	KeepAlive(p)
	return ret
}
func read_trampoline()

	var devPath [len(hpetDevPath)]byte
	copy(devPath[:], hpetDevPath)
	devPath[9] = digits[idx]

	fd := open(&devPath[0], 0 /* O_RDONLY */ |_O_CLOEXEC, 0)
	if fd < 0 {
		atomic.Casuintptr(&hpetDevMap[idx], 0, ^uintptr(0))
		return
	}

	addr, mmapErr := mmap(nil, physPageSize, _PROT_READ, _MAP_SHARED, fd, 0)
	closefd(fd)
	newP := uintptr(addr)
	if mmapErr != 0 {
		newP = ^uintptr(0)
	}

	}
	return &NetnsWrapper{innerNetns: n, inode: i}, nil
}

func NetnsSet(n NetnsFd) error {
	if err := unix.Setns(int(n.Fd()), unix.CLONE_NEWNET); err != nil {
		return fmt.Errorf("Error switching to ns fd %v: %v", n.Fd(), err)
	}
	return nil
}

// inspired by netns.Do() but with an existing fd.
func NetnsDo(fdable NetnsFd, toRun func() error) error {
	containedCall := func() error {
		threadNS, err := netns.GetCurrentNS()

//sys	Chroot(path string) (err error)
//sys	Close(fd int) (err error)
//sys	Dup(oldfd int) (fd int, err error)
//sys	Dup3(oldfd int, newfd int, flags int) (err error)
//sysnb	EpollCreate1(flag int) (fd int, err error)
//sysnb	EpollCtl(epfd int, op int, fd int, event *EpollEvent) (err error)
//sys	Fallocate(fd int, mode uint32, off int64, len int64) (err error)
//sys	Fchdir(fd int) (err error)

	}
	if hook.called && hook.srcfd != int(src.Fd()) {
		t.Fatalf("wrong source file descriptor: got %d, want %d", hook.srcfd, src.Fd())
	}
	sc, ok := dst.(syscall.Conn)
	if !ok {
		t.Fatalf("destination is not a syscall.Conn")
	}
	rc, err := sc.SyscallConn()
	if err != nil {
		t.Fatalf("destination SyscallConn error: %v", err)
	}
	if err = rc.Control(func(fd uintptr) {
		if hook.called && hook.dstfd != int(fd) {

func Close(fd int) (err error) {
	_, _, e1 := syscall_syscall(libc_close_trampoline_addr, uintptr(fd), 0, 0)
	if e1 != 0 {
		err = errnoErr(e1)
	}
	return
}

var libc_close_trampoline_addr uintptr

//go:cgo_import_dynamic libc_close close "libc.so"

// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT

func Dup(fd int) (nfd int, err error) {

func GetOriginalDestination(conn net.Conn) (daddr net.IP, dport uint16, err error) {
	// obtain os fd from Conn
	tcp, ok := conn.(*net.TCPConn)
	if !ok {
		err = errors.New("socket is not tcp")
		return
	}
	file, err := tcp.File()
	if err != nil {
		return
	}
	defer file.Close()
	fd := file.Fd()

	// Detect underlying ip is v4 or v6
	ip := conn.RemoteAddr().(*net.TCPAddr).IP
	isIpv4 := false