diff --git a/src/main.rs b/src/main.rs
index a30525da..8ea4da0b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,6 @@
 mod os_input_output;
 
 use std::io;
-use futures::future::join_all;
 use ::std::fmt::{self, Display, Formatter};
 use std::cmp::max;
 use std::io::{Read, Write};
@@ -51,10 +50,10 @@ impl Stream for ReadFromPid {
                         if *errno == nix::errno::Errno::EAGAIN {
                             return Poll::Ready(Some(vec![])) // TODO: better with timeout waker somehow
                         } else {
-                            panic!("error {:?}", e);
+                            Poll::Ready(None)
                         }
                     },
-                    _ => panic!("error {:?}", e)
+                    _ => Poll::Ready(None)
                 }
             }
         }
@@ -654,6 +653,7 @@ enum ScreenInstruction {
     ResizeLeft,
     ResizeRight,
     MoveFocus,
+    Quit,
 }
 
 struct Screen {
@@ -946,14 +946,14 @@ impl Screen {
 }
 
 enum PtyInstruction {
-    SpawnTerminal
+    SpawnTerminal,
+    Quit
 }
 
 struct PtyBus {
     receive_pty_instructions: Receiver<PtyInstruction>,
     send_pty_instructions: Sender<PtyInstruction>,
     send_screen_instructions: Sender<ScreenInstruction>,
-    active_ptys: Vec<JoinHandle<()>>,
     os_input: Box<dyn OsApi>,
 }
 
@@ -964,13 +964,13 @@ impl PtyBus {
             send_pty_instructions,
             send_screen_instructions,
             receive_pty_instructions,
-            active_ptys: Vec::new(),
+            // active_ptys: Vec::new(),
             os_input,
         }
     }
     pub fn spawn_terminal(&mut self) {
         let (pid_primary, _pid_secondary): (RawFd, RawFd) = self.os_input.spawn_terminal();
-        let task_handle = task::spawn({
+        task::spawn({
             let send_screen_instructions = self.send_screen_instructions.clone();
             let os_input = self.os_input.clone();
             async move {
@@ -989,17 +989,6 @@ impl PtyBus {
             }
         });
         self.send_screen_instructions.send(ScreenInstruction::AddTerminal(pid_primary)).unwrap();
-        self.active_ptys.push(task_handle);
-    }
-    pub async fn _wait_for_tasks(&mut self) {
-//        let task1 = self.active_ptys.get_mut(0).unwrap();
-//        task1.await;
-        let mut v = vec![];
-        for handle in self.active_ptys.iter_mut() {
-            // TODO: better, see commented lines above... can't we do this on the original vec?
-            v.push(handle);
-        }
-        join_all(v).await;
     }
 }
 
@@ -1034,10 +1023,11 @@ fn start(os_input: OsInputOutput) {
                             PtyInstruction::SpawnTerminal => {
                                 pty_bus.spawn_terminal();
                             }
+                            PtyInstruction::Quit => {
+                                break;
+                            }
                         }
                     }
-                    // TODO: do this when we exit
-                    // task::block_on(pty_bus.wait_for_tasks());
                 }
             }).unwrap()
     );
@@ -1073,6 +1063,9 @@ fn start(os_input: OsInputOutput) {
                             ScreenInstruction::MoveFocus => {
                                 screen.move_focus();
                             }
+                            ScreenInstruction::Quit => {
+                                break;
+                            }
                         }
                     }
                 }
@@ -1096,14 +1089,19 @@ fn start(os_input: OsInputOutput) {
             } else if buffer[0] == 14 { // ctrl-n
                 send_pty_instructions.send(PtyInstruction::SpawnTerminal).unwrap();
                 continue;
+            } else if buffer[0] == 17 { // ctrl-q
+                send_screen_instructions.send(ScreenInstruction::Quit).unwrap();
+                send_pty_instructions.send(PtyInstruction::Quit).unwrap();
+                break;
             }
         }
         send_screen_instructions.send(ScreenInstruction::WriteCharacter(buffer[0])).unwrap();
     };
-//    cleanup();
     
-//    for thread_handler in active_threads {
-//        thread_handler.join().unwrap();
-//    }
+    for thread_handler in active_threads {
+        thread_handler.join().unwrap();
+    }
+    // cleanup();
+    println!("\rBye from Mosaic!");
 
 }
diff --git a/src/os_input_output.rs b/src/os_input_output.rs
index 22a507a4..1af6d5df 100644
--- a/src/os_input_output.rs
+++ b/src/os_input_output.rs
@@ -1,4 +1,4 @@
-use nix::unistd::{read, write, ForkResult};
+use nix::unistd::{read, write, ForkResult, Pid};
 use nix::fcntl::{fcntl, FcntlArg, OFlag};
 use nix::sys::termios::{
     tcgetattr,
@@ -7,6 +7,7 @@ use nix::sys::termios::{
     SetArg,
     tcdrain,
 };
+use nix::sys::signal::kill;
 use nix::pty::{forkpty, Winsize};
 use std::os::unix::io::RawFd;
 use std::process::Command;
@@ -66,8 +67,8 @@ fn spawn_terminal () -> (RawFd, RawFd) {
                     },
                     ForkResult::Child => {
                         Command::new(env::var("SHELL").unwrap()).spawn().expect("failed to spawn");
-                        ::std::thread::park();
-                        todo!();
+                        ::std::thread::park(); // TODO: if we remove this, we seem to lose bytes from stdin - find out why
+                        Pid::from_raw(0) // TODO: better
                     },
                 };
                 (pid_primary, pid_secondary.as_raw())
@@ -81,12 +82,7 @@ fn spawn_terminal () -> (RawFd, RawFd) {
 }
 
 #[derive(Clone)]
-pub struct OsInputOutput {
-//    pub get_terminal_size_using_fd: Box<dyn Fn(RawFd) -> Winsize + Send>,
-//    pub set_terminal_size_using_fd: Box<dyn Fn(RawFd, u16, u16) + Send>,
-//    pub into_raw_mode: Box<dyn Fn(RawFd) + Send>,
-//    pub spawn_terminal: Box<dyn Fn(&Winsize) -> (RawFd, RawFd) + Send>,
-}
+pub struct OsInputOutput {}
 
 pub trait OsApi: Send + Sync {
     fn get_terminal_size_using_fd(&self, pid: RawFd) -> Winsize;
@@ -96,8 +92,8 @@ pub trait OsApi: Send + Sync {
     fn read(&self, pid: RawFd, buf: &mut [u8]) -> Result<usize, nix::Error>;
     fn write(&self, pid: RawFd, buf: &mut [u8]) -> Result<usize, nix::Error>;
     fn tcdrain(&self, pid: RawFd) -> Result<(), nix::Error>;
+    fn kill(&self, pid: RawFd) -> Result<(), nix::Error>;
     fn box_clone(&self) -> Box<dyn OsApi>;
-        // let read_result = read(self.pid, &mut self.read_buffer);
 }
 
 impl OsApi for OsInputOutput {
@@ -125,6 +121,9 @@ impl OsApi for OsInputOutput {
     fn box_clone(&self) -> Box<dyn OsApi> {
         Box::new((*self).clone())
     }
+    fn kill(&self, fd: RawFd) -> Result<(), nix::Error> {
+        kill(Pid::from_raw(fd), None)
+    }
 }
 
 impl Clone for Box<dyn OsApi>