Function sys_recvfrom 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn sys_recvfrom(
    fd: i32,
    buf: *mut u8,
    len: usize,
    _flags: i32,
    addr: *mut sockaddr,
    addrlen: *mut socklen_t,
) -> isize

Available on crate features net or virtio-vsock only.