Add timeout example

Cargo.toml

@@ -24,6 +24,7 @@ members = [
     "programs/pkgutils",
     "programs/smith",
     "programs/tar",
+    "programs/timeout",
     "programs/userutils",
     "schemes/ethernetd",
     "schemes/ipd",

mk/userspace/mod.mk

@@ -12,7 +12,8 @@ userspace: \
 	filesystem/bin/acid \
 	filesystem/bin/contain \
 	filesystem/bin/smith \
-	filesystem/bin/tar
+	filesystem/bin/tar \
+	filesystem/bin/timeout
 
 include mk/userspace/coreutils.mk
 include mk/userspace/drivers.mk

programs/timeout/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "timeout"
+version = "0.1.0"
+authors = ["Jeremy Soller <jackpot51@gmail.com>"]
+
+[dependencies]
+redox_event = { git = "https://github.com/redox-os/event.git" }
+redox_syscall = "0.1"

programs/timeout/src/main.rs

@@ -0,0 +1,44 @@
+extern crate event;
+extern crate syscall;
+
+use event::EventQueue;
+use std::fs::File;
+use std::io::{Result, Read, Write};
+use std::mem;
+use std::os::unix::io::AsRawFd;
+use syscall::data::TimeSpec;
+use syscall::flag::CLOCK_MONOTONIC;
+
+fn main() {
+    let mut event_queue = EventQueue::<TimeSpec>::new().expect("timeout: failed to create event queue");
+
+    let path = format!("time:{}", CLOCK_MONOTONIC);
+
+    let mut file = File::open(&path).expect(&format!("timeout: failed to open {}", path));
+
+    let mut timeout = TimeSpec::default();
+    file.read(&mut timeout).unwrap();
+    println!("Current: {:?}", timeout);
+
+    timeout.tv_sec += 1;
+    println!("Setting timeout: {:?}", timeout);
+    file.write(&timeout).unwrap();
+
+    event_queue.add(file.as_raw_fd(), move |_count: usize| -> Result<Option<TimeSpec>> {
+        let mut time = TimeSpec::default();
+        if file.read(&mut time)? >= mem::size_of::<TimeSpec>() {
+            if time.tv_sec > timeout.tv_sec
+            || (time.tv_sec == timeout.tv_sec && time.tv_nsec >= timeout.tv_nsec )
+            {
+                return Ok(Some(time))
+            }
+        }
+        Ok(None)
+    }).expect("timeout: failed to poll time");
+
+    event_queue.trigger_all(0).expect("timeout: failed to trigger events");
+
+    let time = event_queue.run().expect("timeout: failed to run event loop");
+
+    println!("Time passed: {:?}", time);
+}