feat(userspace): programs in /bin w/o .elf; bin manifests (needs = display) so shell runs snake; Ctrl+C kills foreground via terminal interrupt notification; ctrl keys; sleep

crates/apps/sleep/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "sleep"
+version = "0.1.0"
+edition = "2024"
+
+[[bin]]
+name = "sleep"
+test = false
+bench = false
+
+[dependencies]
+types = { workspace = true }
+
+libkos = { workspace = true }

crates/apps/sleep/src/main.rs

@@ -0,0 +1,28 @@
+//! Waits: `sleep <seconds>`. Mostly something to stop with Ctrl+C.
+
+#![no_std]
+#![no_main]
+
+extern crate libkos;
+
+use libkos::{println, syscall};
+use types::time::Ticks;
+
+/// QEMU virt's timebase.
+const TICKS_PER_SECOND: u64 = 10_000_000;
+
+#[unsafe(no_mangle)]
+extern "C" fn main() {
+    let Some(seconds) = libkos::start::args().nth(1).and_then(|s| s.parse::<u64>().ok()) else {
+        println!("usage: sleep <seconds>");
+        return;
+    };
+    let Ok(alarm) = syscall::create_notification() else {
+        println!("sleep: no notification");
+        return;
+    };
+    let at = syscall::get_time().raw().saturating_add(seconds.saturating_mul(TICKS_PER_SECOND));
+    if syscall::set_timer(alarm, Ticks::from_raw(at)).is_ok() {
+        let _ = syscall::wait(alarm);
+    }
+}