replace broken shuteye with libc

V2/sleep/src/main.rs

@@ -1,6 +1,6 @@
 #![feature(step_by)]
 extern crate argparse;
-extern crate shuteye;
+extern crate libc;
 extern crate time;
 
 use std::io::prelude::*;
@@ -9,9 +9,36 @@ use std::path::Path;
 use std::time::Duration;
 
 use argparse::{ArgumentParser, Print, Store};
-use shuteye::sleep;
+use libc::{c_long, clock_nanosleep, time_t, timespec};
 use time::precise_time_ns;
 
+const CLOCK_MONOTONIC: i32 = 1;
+
+pub fn sleep(duration: Duration) -> Option<Duration> {
+    let ts = duration_to_timespec(duration);
+    let mut remain = timespec {
+        tv_sec: 0,
+        tv_nsec: 0,
+    };
+    let ret = unsafe { clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, &mut remain) };
+    println!("ret = {}", ret);
+    if remain.tv_nsec == 0 && remain.tv_sec == 0 {
+        return None;
+    }
+    Some(timespec_to_duration(remain))
+}
+
+fn duration_to_timespec(duration: Duration) -> timespec {
+    timespec {
+        tv_sec: duration.as_secs() as time_t,
+        tv_nsec: duration.subsec_nanos() as c_long,
+    }
+}
+
+fn timespec_to_duration(timespec: timespec) -> Duration {
+    Duration::new(timespec.tv_sec as u64, timespec.tv_nsec as u32)
+}
+
 fn duration_from_ns(duration_ns: u64) -> Duration {
     Duration::new(duration_ns / 1_000_000_000, (duration_ns % 1_000_000_000) as u32)
 }