Vendor dependencies

Let's see how I like this workflow.

vendor/signal-hook/examples/print.rs

@@ -0,0 +1,27 @@
+use libc::c_int;
+use signal_hook::consts::signal::*;
+use signal_hook::low_level;
+
+use std::io::Error;
+
+#[cfg(feature = "extended-siginfo")]
+type Signals =
+    signal_hook::iterator::SignalsInfo<signal_hook::iterator::exfiltrator::origin::WithOrigin>;
+
+#[cfg(not(feature = "extended-siginfo"))]
+use signal_hook::iterator::Signals;
+
+fn main() -> Result<(), Error> {
+    const SIGNALS: &[c_int] = &[
+        SIGTERM, SIGQUIT, SIGINT, SIGTSTP, SIGWINCH, SIGHUP, SIGCHLD, SIGCONT,
+    ];
+    let mut sigs = Signals::new(SIGNALS)?;
+    for signal in &mut sigs {
+        eprintln!("Received signal {:?}", signal);
+        #[cfg(feature = "extended-siginfo")]
+        let signal = signal.signal;
+        // After printing it, do whatever the signal was supposed to do in the first place
+        low_level::emulate_default_handler(signal)?;
+    }
+    Ok(())
+}