libdvb/examples/cainfo.rs

use {
    anyhow::{bail, Context, Result},
    nix::{
        poll::{poll, PollFd, PollFlags},
        sys::{
            time::{TimeSpec, TimeValLike},
            timerfd::{ClockId, Expiration, TimerFd, TimerFlags, TimerSetTimeFlags},
        },
    },
    std::os::unix::io::AsRawFd,
};

fn start_ca(_adapter: u32, _device: u32) -> Result<()> {
    // let mut ca = CaDevice::open(path, 0)?;

    let timer = TimerFd::new(ClockId::CLOCK_MONOTONIC, TimerFlags::all())?;

    timer.set(
        Expiration::Interval(TimeSpec::milliseconds(100)),
        TimerSetTimeFlags::empty(),
    )?;

    let mut pool: Vec<PollFd> = Vec::new();

    pool.push(PollFd::new(timer.as_raw_fd(), PollFlags::POLLIN));

    let instant = std::time::Instant::now();

    for _ in 0..10 {
        let mut total = poll(&mut pool, -1)?;
        // less than 0 not needed to check we got error in this case
        // equal to 0 not needed to check we have no timeout

        for (i, item) in pool.iter().enumerate() {
            let revent = item.revents().unwrap_or_else(PollFlags::empty);
            if revent.is_empty() {
                continue;
            }

            if i == 0 {
                timer.wait()?;
                dbg!(instant.elapsed());
            }

            if total > 1 {
                total -= 1;
            } else {
                break;
            }
        }

        // loop
    }

    // let fd = PollFd::new(
    //     ca.as_raw_fd(),
    //     PollFlags::POLLIN,
    // );

    // TODO: CaPool
    // TODO: timer CA_DELAY -> poll_timer()
    // TODO: self.as_raw_fd() -> poll_event()

    Ok(())
}

fn main() -> Result<()> {
    let mut args = std::env::args().skip(1);

    let adapter = match args.next() {
        Some(v) => v.parse::<u32>().context("adapter number")?,
        None => bail!("adapter number not defined"),
    };

    let device = match args.next() {
        Some(v) => v.parse::<u32>().context("device number")?,
        None => 0,
    };

    start_ca(adapter, device)
}