func ipv4MulticastInterface(fd int) (*net.Interface, error) {
a, err := syscall.GetsockoptInet4Addr(fd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF)
if err != nil {
return nil, os.NewSyscallError("getsockopt", err)
}
return netIP4ToInterface(net.IPv4(a[0], a[1], a[2], a[3]))
}
func ipv4MulticastInterface(fd int) (*net.Interface, error) {
v, err := syscall.GetsockoptInet4Addr(fd, ianaProtocolIP, syscall.IP_MULTICAST_IF)
if err != nil {
return nil, os.NewSyscallError("getsockopt", err)
}
return netIP4ToInterface(net.IPv4(v[0], v[1], v[2], v[3]))
}
func ipv4MulticastInterface(fd *netFD) (*Interface, error) {
fd.incref()
defer fd.decref()
a, err := syscall.GetsockoptInet4Addr(fd.sysfd, syscall.IPPROTO_IP, syscall.IP_MULTICAST_IF)
if err != nil {
return nil, os.NewSyscallError("getsockopt", err)
}
return ipv4AddrToInterface(IPv4(a[0], a[1], a[2], a[3]))
}