Add server start/stop timeout to force kill server if it gets stuck

src/os/unix.rs

@@ -1,11 +1,27 @@
+/// Force kill process on Unix by sending SIGKILL.
+///
+/// This is unsafe because the PID isn't checked.
+pub unsafe fn force_kill(pid: u32) -> bool {
+    debug!(target: "lazymc", "Sending SIGKILL signal to {} to kill server", pid);
+    let result = libc::kill(pid as i32, libc::SIGKILL);
+
+    if result != 0 {
+        trace!(target: "lazymc", "SIGKILL failed: {}", result);
+    }
+
+    result == 0
+}
+
 /// Gracefully kill process on Unix by sending SIGTERM.
 ///
 /// This is unsafe because the PID isn't checked.
-pub unsafe fn kill_gracefully(pid: u32) {
+pub unsafe fn kill_gracefully(pid: u32) -> bool {
     debug!(target: "lazymc", "Sending SIGTERM signal to {} to kill server", pid);
     let result = libc::kill(pid as i32, libc::SIGTERM);
-    trace!(target: "lazymc", "SIGTERM result: {}", result);
 
-    // TODO: send sigterm to childs as well?
-    // TODO: handle error if result != 0
+    if result != 0 {
+        trace!(target: "lazymc", "SIGTERM failed: {}", result);
+    }
+
+    result == 0
 }