rumia/src/swap.rs

use std::ffi::{CString};
use nix::libc::swapon;
use crate::log::logger;

pub fn swap_on(dev: &str) {
    let cstr_res = CString::new(dev.clone());
    let cstr = match cstr_res {
        Ok(v) => v,
        Err(err) => {
            logger().warn("swap", format!("failed convert dev path '{}' to CString: {:?}", dev, err).as_str());
            return;
        }
    };
    let ret = unsafe {
         swapon(cstr.as_ptr(),0)
    };
    if ret != 0 {
        let eno = nix::errno::from_i32(ret);
        logger().warn("swap", format!("failed turn on swap'{}': {:?}", dev, eno).as_str());
    }else{
        logger().info("swap", format!("turn on swap '{}' ok.", dev).as_str());
    }
}