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

//go:build unix || windows

package poll

import "syscall"

// SetsockoptIPMreq wraps the setsockopt network call with an IPMreq argument.
func (fd *FD) SetsockoptIPMreq(level, name int, mreq *syscall.IPMreq) error {
	if err := fd.incref(); err != nil {
		return err
	}
	defer fd.decref()
	return syscall.SetsockoptIPMreq(fd.Sysfd, level, name, mreq)
}

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

//go:build unix || windows

package net

import (
	"runtime"
	"syscall"
)

func joinIPv4Group(fd *netFD, ifi *Interface, ip IP) error {
	mreq := &syscall.IPMreq{Multiaddr: [4]byte{ip[0], ip[1], ip[2], ip[3]}}
	if err := setIPv4MreqToInterface(mreq, ifi); err != nil {
		return err
	}
	err := fd.pfd.SetsockoptIPMreq(syscall.IPPROTO_IP, syscall.IP_ADD_MEMBERSHIP, mreq)

				return v.IP, nil
			}
		case *IPNet:
			if v.IP.To4() != nil {
				return v.IP, nil
			}
		}
	}
	return nil, errNoSuchInterface
}

func setIPv4MreqToInterface(mreq *syscall.IPMreq, ifi *Interface) error {
	if ifi == nil {
		return nil
	}
	ifat, err := ifi.Addrs()
	if err != nil {
		return err
	}
	for _, ifa := range ifat {
		switch v := ifa.(type) {
		case *IPAddr:

	raw, err := os.Open(fn)
	if err != nil {
		t.Errorf("%s (order=%d litWidth=%d): %v", fn, order, litWidth, err)
		return
	}

	piper, pipew := io.Pipe()
	defer piper.Close()
	go func() {
		defer raw.Close()
		defer pipew.Close()
		lzww := NewWriter(pipew, order, litWidth)
		defer lzww.Close()
		var b [4096]byte
		for {
			n, err0 := raw.Read(b[:])

type RawSockaddrAny C.struct_sockaddr_any

type _Socklen C.socklen_t

type Cmsghdr C.struct_cmsghdr

type ICMPv6Filter C.struct_icmp6_filter

type Iovec C.struct_iovec

type IPMreq C.struct_ip_mreq

type IPv6Mreq C.struct_ipv6_mreq

type Linger C.struct_linger

type Msghdr C.struct_msghdr

const (
	SizeofSockaddrInet4    = C.sizeof_struct_sockaddr_in

type RawSockaddr C.struct_sockaddr

type RawSockaddrAny C.struct_sockaddr_any

type _Socklen C.socklen_t

type Linger C.struct_linger

type Iovec C.struct_iovec

type IPMreq C.struct_ip_mreq

type IPv6Mreq C.struct_ipv6_mreq

type Msghdr C.struct_msghdr

type Cmsghdr C.struct_cmsghdr

type Inet6Pktinfo C.struct_in6_pktinfo

type IPv6MTUInfo C.struct_ip6_mtuinfo

type Cmsghdr struct {
	Len   uint32
	Level int32
	Type  int32
}

type ICMPv6Filter struct {
	Filt [8]uint32
}

type Iovec struct {
	Base *byte
	Len  uint32
}

type IPMreq struct {
	Multiaddr [4]byte /* in_addr */
	Interface [4]byte /* in_addr */
}

type IPv6Mreq struct {
	Multiaddr [16]byte /* in6_addr */
	Interface uint32
}

type IPv6MTUInfo struct {

type RawSockaddr C.struct_sockaddr

type RawSockaddrAny C.struct_sockaddr_any

type _Socklen C.socklen_t

type Linger C.struct_linger

type Iovec C.struct_iovec

type IPMreq C.struct_ip_mreq

type IPv6Mreq C.struct_ipv6_mreq

type Msghdr C.struct_msghdr

type Cmsghdr C.struct_cmsghdr

type Inet6Pktinfo C.struct_in6_pktinfo

type IPv6MTUInfo C.struct_ip6_mtuinfo

type RawSockaddr C.struct_sockaddr

type RawSockaddrAny C.struct_sockaddr_any

type _Socklen C.socklen_t

type Linger C.struct_linger

type Iovec C.struct_iovec

type IPMreq C.struct_ip_mreq

type IPv6Mreq C.struct_ipv6_mreq

type Msghdr C.struct_msghdr

type Cmsghdr C.struct_cmsghdr

type Inet4Pktinfo C.struct_in_pktinfo

type Inet6Pktinfo C.struct_in6_pktinfo

	Addr RawSockaddr
	Pad  [236]int8
}

type _Socklen uint32

type Linger struct {
	Onoff  int32
	Linger int32
}

type Iovec struct {
	Base *int8
	Len  uint64
}

type IPMreq struct {
	Multiaddr [4]byte /* in_addr */
	Interface [4]byte /* in_addr */
}

type IPv6Mreq struct {
	Multiaddr [16]byte /* in6_addr */
	Interface uint32
}

type Msghdr struct {