Function wait

pub fn wait<F>(fd: RawFd, cond: F, timeout: Option<Duration>) -> bool
where
    F: Fn() -> bool,

Wait for until a condition cond is true or the timeout is reached. If the timeout is None it will wait an infinite time. The condition is checked when the file has changed.

Arguments

• file - Listen to changes in this file
• cond - Condition that should become true
• timeout - Maximal timeout to wait for the condition or file changes

Example

use std::fs::File;
use std::os::unix::io::AsRawFd;
use std::time::Duration;

use ev3dev_lang_rust::wait;

if let Ok(file) = File::open("...") {
    let cond = || {
        // ...
        true
    };
    let timeout = Duration::from_millis(2000);

    wait::wait(file.as_raw_fd(), cond, Some(timeout));
}