You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: test_socket.rs
    path of file: ./repos/nix/test/sys
    
    the code of the file until where you have to start completion: #[cfg(linux_android)]
use crate::*;
use libc::c_char;
use nix::sys::socket::{getsockname, AddressFamily, UnixAddr};
use std::collections::hash_map::DefaultHasher;
use std::hash::{Hash, Hasher};
use std::net::{SocketAddrV4, SocketAddrV6};
use std::os::unix::io::{AsRawFd, RawFd};
use std::path::Path;
use std::slice;
use std::str::FromStr;

#[cfg(target_os = "linux")]
#[cfg_attr(qemu, ignore)]
#[test]
pub fn test_timestamping() {
    use nix::sys::socket::{
        recvmsg, sendmsg, setsockopt, socket, sockopt::Timestamping,
        ControlMessageOwned, MsgFlags, SockFlag, SockType, SockaddrIn,
        TimestampingFlag,
    };
    use std::io::{IoSlice, IoSliceMut};

    let sock_addr = SockaddrIn::from_str("127.0.0.1:6797").unwrap();

    let ssock = socket(
        AddressFamily::Inet,
        SockType::Datagram,
        SockFlag::empty(),
        None,
    )
    .expect("send socket failed");

    let rsock = socket(
        AddressFamily::Inet,
        SockType::Datagram,
        SockFlag::empty(),
        None,
    )
    .unwrap();
    nix::sys::socket::bind(rsock.as_raw_fd(), &sock_addr).unwrap();

    setsockopt(&rsock, Timestamping, &TimestampingFlag::all()).unwrap();

    let sbuf = [0u8; 2048];
    let mut rbuf = [0u8; 2048];
    let flags = MsgFlags::empty();
    let iov1 = [IoSlice::new(&sbuf)];
    let mut iov2 = [IoSliceMut::new(&mut rbuf)];

    let mut cmsg = cmsg_space!(nix::sys::socket::Timestamps);
    sendmsg(ssock.as_raw_fd(), &iov1, &[], flags, Some(&sock_addr)).unwrap();
    let recv =
        recvmsg::<()>(rsock.as_raw_fd(), &mut iov2, Some(&mut cmsg), flags)
            .unwrap();

    let mut ts = None;
    for c in recv.cmsgs() {
        if let ControlMessageOwned::ScmTimestampsns(timestamps) = c {
            ts = Some(timestamps.system);
        }
    }
    let ts = ts.expect("ScmTimestampns is present");
    let sys_time =
        ::nix::time::clock_gettime(::nix::time::ClockId::CLOCK_REALTIME)
            .unwrap();
    let diff = if ts > sys_time {
        ts - sys_time
    } else {
        sys_time - ts
    };
    assert!(std::time::Duration::from(diff).as_secs() < 60);
}

#[cfg(target_os = "freebsd")]
#[test]
pub fn test_timestamping_realtime() {
    use nix::sys::socket::{
        recvmsg, sendmsg, setsockopt, socket, sockopt::ReceiveTimestamp,
        sockopt::TsClock, ControlMessageOwned, MsgFlags, SockFlag, SockType,
        SockaddrIn, SocketTimestamp,
    };
    use std::io::{IoSlice, IoSliceMut};

    let sock_addr = SockaddrIn::from_str("127.0.0.1:6792").unwrap();

    let ssock = socket(
        AddressFamily::Inet,
        SockType::Datagram,
        SockFlag::empty(),
        None,
    )
    .expec
    
pub fn test_recvif_ipv4() {
    use nix::sys::socket::sockopt::Ipv4OrigDstAddr;
    use nix::sys::socket::{bind, SockFlag, SockType, SockaddrIn};
    use nix::sys::socket::{getsockname, setsockopt, socket};
    use nix::sys::socket::{recvmsg, sendmsg, ControlMessageOwned, MsgFlags};
    use std::io::{IoSlice, IoSliceMut};

    let lo_ifaddr = loopback_address(AddressFamily::Inet);
    let (_lo_name, lo) = match lo_ifaddr {
        Some(ifaddr) => (
            ifaddr.interface_name,
            ifaddr.address.expect("Expect IPv4 address on interface"),
        ),
        None => return,
    };
    let receive = socket(
        AddressFamily::Inet,
        SockType::Datagram,
        SockFlag::empty(),
        None,
    )
    .expect("receive socket failed");
    bind(receive.as_raw_fd(), &lo).expect("bind failed");
    let sa: SockaddrIn =
        getsockname(receive.as_raw_fd()).expect("getsockname failed");
    setsockopt(&receive, Ipv4OrigDstAddr, &true)
        .expect("setsockopt IP_ORIGDSTADDR failed");

    {
        let slice = [1u8, 2, 3, 4, 5, 6, 7, 8];
        let iov = [IoSlice::new(&slice)];

        let send = socket(
            AddressFamily::Inet,
            SockType::Datagram,
            SockFlag::empty(),
            None,
        )
        .expect("send socket failed");
        sendmsg(send.as_raw_fd(), &iov, &[], MsgFlags::empty(), Some(&sa))
            .expect("sendmsg failed");
    }

    {
        let mut buf = [0u8; 8];
        let mut iovec = [IoSliceMut::new(&mut buf)];
        let mut space = cmsg_space!(libc::sockaddr_in);
        let msg = recvmsg::<()>(
            receive.as_raw_fd(),
            &mut iovec,
            Some(&mut space),
            MsgFlags::empty(),
        )
        .expect("recvmsg failed");
        assert!(!msg
            .flags
            .intersects(MsgFlags::MSG_TRUNC | MsgFlags::MSG_CTRUNC));
        assert_eq!(msg.cmsgs().count(), 1, "expected 1 cmsgs");

        let mut rx_recvorigdstaddr = false;
        for cmsg in msg.cmsgs() {
            match cmsg {
                ControlMessageOwned::Ipv4OrigDstAddr(addr) => {
                    rx_recvorigdstaddr = true;
                    if let Some(sin) = lo.as_sockaddr_in() {
                        assert_eq!(sin.as_ref().sin_addr.s_addr,
                                   addr.sin_addr.s_addr,
                                   "unexpected destination address (expected {}, got {})",
                                   sin.as_ref().sin_addr.s_addr,
                                   addr.sin_addr.s_addr);
                    } else {
                        panic!("unexpected Sockaddr");
                    }
                }
                _ => panic!("unexpected additional control msg"),
            }
        }
        assert!(rx_recvorigdstaddr);
        assert_eq!(msg.bytes, 8);
        assert_eq!(*iovec[0], [1u8, 2, 3, 4, 5, 6, 7, 8]);
    }
}