nc 0.8.13

Access system calls directly
Documentation 
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/// Accept a connection on a socket.
pub unsafe fn accept4(
    sockfd: i32,
    addr: &mut sockaddr_in_t,
    addrlen: &mut socklen_t,
    flags: i32,
) -> Result<(), Errno> {
    let sockfd = sockfd as usize;
    let addr_ptr = addr as *mut sockaddr_in_t as usize;
    let addrlen_ptr = addrlen as *mut socklen_t as usize;
    let flags = flags as usize;
    syscall4(SYS_ACCEPT4, sockfd, addr_ptr, addrlen_ptr, flags).map(drop)
}