diff --git a/fs/vfs/src/node.rs b/fs/vfs/src/node.rs
index 8ff2185..1e066b9 100644
--- a/fs/vfs/src/node.rs
+++ b/fs/vfs/src/node.rs
@@ -414,7 +414,7 @@ impl Vnode {
         }
     }
 
-    pub fn check_access(&self, ioctx: &Ioctx, access: AccessMode) -> Result<(), Errno> {
+    pub fn check_access(&self, _ioctx: &Ioctx, access: AccessMode) -> Result<(), Errno> {
         let props = self.props.borrow();
         let mode = props.mode;
 
diff --git a/kernel/src/arch/aarch64/exception.rs b/kernel/src/arch/aarch64/exception.rs
index 5be036d..ff9a74e 100644
--- a/kernel/src/arch/aarch64/exception.rs
+++ b/kernel/src/arch/aarch64/exception.rs
@@ -4,7 +4,7 @@ use crate::arch::machine;
 use crate::debug::Level;
 use crate::dev::irq::{IntController, IrqContext};
 use crate::mem;
-use crate::proc::{sched, Thread, Process};
+use crate::proc::{sched, Thread};
 use crate::syscall;
 use cortex_a::registers::{ESR_EL1, FAR_EL1};
 use libsys::{abi::SystemCall, signal::Signal};
@@ -120,7 +120,6 @@ extern "C" fn __aa64_exc_sync_handler(exc: &mut ExceptionFrame) {
             let num = SystemCall::from_repr(exc.x[8]);
             if num.is_none() {
                 todo!();
-                return;
             }
             let num = num.unwrap();
 
diff --git a/kernel/src/init.rs b/kernel/src/init.rs
index 53aea9f..9744253 100644
--- a/kernel/src/init.rs
+++ b/kernel/src/init.rs
@@ -3,7 +3,7 @@
 use crate::config::{ConfigKey, CONFIG};
 use crate::fs::{devfs, MemfsBlockAlloc};
 use crate::mem;
-use crate::proc::{wait, elf, Process};
+use crate::proc::{elf, Process};
 use libsys::stat::{FileDescriptor, OpenFlags};
 use memfs::Ramfs;
 use vfs::{Filesystem, Ioctx};
diff --git a/kernel/src/mem/phys/manager.rs b/kernel/src/mem/phys/manager.rs
index 74ce890..de4ba15 100644
--- a/kernel/src/mem/phys/manager.rs
+++ b/kernel/src/mem/phys/manager.rs
@@ -93,18 +93,18 @@ impl SimpleManager {
         self.stats.available -= count;
     }
 
-    fn update_stats_free(&mut self, pu: PageUsage, count: usize) {
-        let field = match pu {
-            PageUsage::Kernel => &mut self.stats.kernel,
-            PageUsage::KernelHeap => &mut self.stats.kernel_heap,
-            PageUsage::Paging => &mut self.stats.paging,
-            PageUsage::UserPrivate => &mut self.stats.user_private,
-            PageUsage::Filesystem => &mut self.stats.filesystem,
-            _ => panic!("TODO {:?}", pu),
-        };
-        *field -= count;
-        self.stats.available += count;
-    }
+    // fn update_stats_free(&mut self, pu: PageUsage, count: usize) {
+    //     let field = match pu {
+    //         PageUsage::Kernel => &mut self.stats.kernel,
+    //         PageUsage::KernelHeap => &mut self.stats.kernel_heap,
+    //         PageUsage::Paging => &mut self.stats.paging,
+    //         PageUsage::UserPrivate => &mut self.stats.user_private,
+    //         PageUsage::Filesystem => &mut self.stats.filesystem,
+    //         _ => panic!("TODO {:?}", pu),
+    //     };
+    //     *field -= count;
+    //     self.stats.available += count;
+    // }
 }
 unsafe impl Manager for SimpleManager {
     fn alloc_page(&mut self, pu: PageUsage) -> Result<usize, Errno> {
@@ -134,25 +134,21 @@ unsafe impl Manager for SimpleManager {
         Err(Errno::OutOfMemory)
     }
     fn free_page(&mut self, addr: usize) -> Result<(), Errno> {
-        let usage = {
-            let index = self.page_index(addr);
-            let page = &mut self.pages[index];
+        let index = self.page_index(addr);
+        let page = &mut self.pages[index];
 
-            let usage = page.usage;
-            assert!(page.usage != PageUsage::Reserved && page.usage != PageUsage::Available);
+        assert!(page.usage != PageUsage::Reserved && page.usage != PageUsage::Available);
 
-            if page.refcount > 1 {
-                page.refcount -= 1;
-            } else {
-                assert_eq!(page.refcount, 1);
-                page.usage = PageUsage::Available;
-                page.refcount = 0;
+        if page.refcount > 1 {
+            page.refcount -= 1;
+        } else {
+            assert_eq!(page.refcount, 1);
+            page.usage = PageUsage::Available;
+            page.refcount = 0;
 
-                self.last_index = index;
-            }
+            self.last_index = index;
+        }
 
-            usage
-        };
         // FIXME
         // self.update_stats_free(usage, 1);
 
diff --git a/kernel/src/proc/process.rs b/kernel/src/proc/process.rs
index 06bbed6..e11f518 100644
--- a/kernel/src/proc/process.rs
+++ b/kernel/src/proc/process.rs
@@ -6,11 +6,10 @@ use crate::mem::{
     virt::{MapAttributes, Space},
 };
 use crate::proc::{
-    wait::Wait, Context, ProcessIo, Thread, ThreadRef, ThreadState, PROCESSES, SCHED, THREADS,
+    wait::Wait, Context, ProcessIo, Thread, ThreadRef, ThreadState, PROCESSES, SCHED,
 };
 use crate::sync::{IrqSafeSpinLock, IrqSafeSpinLockGuard};
 use alloc::{rc::Rc, vec::Vec};
-use core::cell::UnsafeCell;
 use core::sync::atomic::{AtomicU32, Ordering};
 use libsys::{
     error::Errno,
@@ -108,7 +107,7 @@ impl Process {
 
     /// Sets a pending signal for a process
     pub fn set_signal(&self, signal: Signal) {
-        let mut lock = self.inner.lock();
+        let lock = self.inner.lock();
         let main_thread = Thread::get(lock.threads[0]).unwrap();
 
         // TODO check that `signal` is not a fault signal
@@ -133,7 +132,11 @@ impl Process {
         }
     }
 
-    fn enter_signal_on(mut inner: IrqSafeSpinLockGuard<ProcessInner>, thread: ThreadRef, signal: Signal) {
+    fn enter_signal_on(
+        mut inner: IrqSafeSpinLockGuard<ProcessInner>,
+        thread: ThreadRef,
+        signal: Signal,
+    ) {
         let ttbr0 =
             inner.space.as_mut().unwrap().address_phys() | ((inner.id.asid() as usize) << 48);
         drop(inner);
diff --git a/kernel/src/proc/sched.rs b/kernel/src/proc/sched.rs
index 28f002e..ccdc751 100644
--- a/kernel/src/proc/sched.rs
+++ b/kernel/src/proc/sched.rs
@@ -1,5 +1,5 @@
 //!
-use crate::proc::{Pid, Process, ProcessRef, Thread, ThreadRef, PROCESSES, THREADS};
+use crate::proc::{Thread, ThreadRef, THREADS};
 use crate::sync::IrqSafeSpinLock;
 use crate::util::InitOnce;
 use alloc::{collections::VecDeque, rc::Rc};
diff --git a/kernel/src/proc/thread.rs b/kernel/src/proc/thread.rs
index 3e4ed85..7c23763 100644
--- a/kernel/src/proc/thread.rs
+++ b/kernel/src/proc/thread.rs
@@ -2,10 +2,14 @@ use crate::arch::aarch64::exception::ExceptionFrame;
 use crate::proc::{wait::Wait, Process, ProcessRef, SCHED, THREADS};
 use crate::sync::IrqSafeSpinLock;
 use crate::util::InitOnce;
-use alloc::{rc::Rc, vec::Vec};
+use alloc::rc::Rc;
 use core::cell::UnsafeCell;
 use core::sync::atomic::{AtomicU32, Ordering};
-use libsys::{error::Errno, proc::{Pid, ExitCode}, signal::Signal};
+use libsys::{
+    error::Errno,
+    proc::{ExitCode, Pid},
+    signal::Signal,
+};
 
 pub use crate::arch::platform::context::{self, Context};
 
@@ -297,7 +301,7 @@ impl Thread {
             panic!("Already handling a signal (maybe handle this case)");
         }
 
-        let mut lock = self.inner.lock();
+        let lock = self.inner.lock();
         if lock.signal_entry == 0 || lock.signal_stack == 0 {
             drop(lock);
             Process::exit_thread(self, ExitCode::from(-1));
@@ -317,7 +321,12 @@ impl Thread {
         assert_eq!(lock.state, State::Running);
 
         unsafe {
-            signal_ctx.setup_signal_entry(lock.signal_entry, signal as usize, ttbr0, lock.signal_stack);
+            signal_ctx.setup_signal_entry(
+                lock.signal_entry,
+                signal as usize,
+                ttbr0,
+                lock.signal_stack,
+            );
         }
 
         drop(lock);
diff --git a/kernel/src/proc/wait.rs b/kernel/src/proc/wait.rs
index 2d21c8e..5885275 100644
--- a/kernel/src/proc/wait.rs
+++ b/kernel/src/proc/wait.rs
@@ -2,11 +2,11 @@
 
 use crate::arch::machine;
 use crate::dev::timer::TimestampSource;
-use crate::proc::{self, sched::SCHED, Process, Thread, ThreadRef};
+use crate::proc::{sched::SCHED, Thread, ThreadRef};
 use crate::sync::IrqSafeSpinLock;
 use alloc::collections::LinkedList;
 use core::time::Duration;
-use libsys::{error::Errno, stat::FdSet, proc::Pid};
+use libsys::{error::Errno, stat::FdSet};
 
 /// Wait channel structure. Contains a queue of processes
 /// waiting for some event to happen.
@@ -61,46 +61,45 @@ pub fn select(
     mut wfds: Option<&mut FdSet>,
     timeout: Option<Duration>,
 ) -> Result<usize, Errno> {
-    todo!();
-    // // TODO support wfds
-    // if wfds.is_some() || rfds.is_none() {
-    //     todo!();
-    // }
-    // let read = rfds.as_deref().map(FdSet::clone);
-    // let write = wfds.as_deref().map(FdSet::clone);
-    // rfds.as_deref_mut().map(FdSet::reset);
-    // wfds.as_deref_mut().map(FdSet::reset);
+    if wfds.is_none() && rfds.is_none() {
+        todo!();
+    }
+    let read = rfds.as_deref().map(FdSet::clone);
+    let write = wfds.as_deref().map(FdSet::clone);
+    rfds.as_deref_mut().map(FdSet::reset);
+    wfds.as_deref_mut().map(FdSet::reset);
 
-    // let deadline = timeout.map(|v| v + machine::local_timer().timestamp().unwrap());
-    // let mut io = proc.io.lock();
+    let deadline = timeout.map(|v| v + machine::local_timer().timestamp().unwrap());
+    let proc = thread.owner().unwrap();
+    let mut io = proc.io.lock();
 
-    // loop {
-    //     if let Some(read) = &read {
-    //         for fd in read.iter() {
-    //             let file = io.file(fd)?;
-    //             if file.borrow().is_ready(false)? {
-    //                 rfds.as_mut().unwrap().set(fd);
-    //                 return Ok(1);
-    //             }
-    //         }
-    //     }
-    //     if let Some(write) = &write {
-    //         for fd in write.iter() {
-    //             let file = io.file(fd)?;
-    //             if file.borrow().is_ready(true)? {
-    //                 wfds.as_mut().unwrap().set(fd);
-    //                 return Ok(1);
-    //             }
-    //         }
-    //     }
+    loop {
+        if let Some(read) = &read {
+            for fd in read.iter() {
+                let file = io.file(fd)?;
+                if file.borrow().is_ready(false)? {
+                    rfds.as_mut().unwrap().set(fd);
+                    return Ok(1);
+                }
+            }
+        }
+        if let Some(write) = &write {
+            for fd in write.iter() {
+                let file = io.file(fd)?;
+                if file.borrow().is_ready(true)? {
+                    wfds.as_mut().unwrap().set(fd);
+                    return Ok(1);
+                }
+            }
+        }
 
-    //     // Suspend
-    //     match WAIT_SELECT.wait(deadline) {
-    //         Err(Errno::TimedOut) => return Ok(0),
-    //         Err(e) => return Err(e),
-    //         Ok(_) => {}
-    //     }
-    // }
+        // Suspend
+        match WAIT_SELECT.wait(deadline) {
+            Err(Errno::TimedOut) => return Ok(0),
+            Err(e) => return Err(e),
+            Ok(_) => {}
+        }
+    }
 }
 
 impl Wait {
diff --git a/kernel/src/syscall/arg.rs b/kernel/src/syscall/arg.rs
index 58d3d1f..937ec98 100644
--- a/kernel/src/syscall/arg.rs
+++ b/kernel/src/syscall/arg.rs
@@ -2,7 +2,6 @@
 
 use crate::mem;
 use core::alloc::Layout;
-use core::mem::size_of;
 use libsys::error::Errno;
 use crate::proc::Process;
 
@@ -100,7 +99,7 @@ fn validate_ptr(base: usize, len: usize, write: bool) -> Result<(), Errno> {
                 })
             } else {
                 todo!();
-                Err(Errno::DoesNotExist)
+                // Err(Errno::DoesNotExist)
             };
 
             if res.is_ok() {
diff --git a/libsys/src/calls.rs b/libsys/src/calls.rs
index 20acb26..b5e13e7 100644
--- a/libsys/src/calls.rs
+++ b/libsys/src/calls.rs
@@ -191,7 +191,7 @@ pub fn sys_fstatat(
 /// System call
 #[inline(always)]
 pub unsafe fn sys_fork() -> Result<Option<Pid>, Errno> {
-    Errno::from_syscall(unsafe { syscall!(SystemCall::Fork) }).map(|res| {
+    Errno::from_syscall(syscall!(SystemCall::Fork)).map(|res| {
         if res != 0 {
             Some(unsafe { Pid::from_raw(res as u32) })
         } else {
diff --git a/libusr/src/file.rs b/libusr/src/file.rs
index 80e7727..7603252 100644
--- a/libusr/src/file.rs
+++ b/libusr/src/file.rs
@@ -1,6 +1,4 @@
 use crate::io::{AsRawFd, Error};
-use crate::os;
-use crate::trace;
 use libsys::stat::FileDescriptor;
 
 pub struct File {
@@ -8,7 +6,7 @@ pub struct File {
 }
 
 impl File {
-    pub fn open(path: &str) -> Result<File, Error> {
+    pub fn open(_path: &str) -> Result<File, Error> {
         todo!()
     }
 }
diff --git a/libusr/src/io/error.rs b/libusr/src/io/error.rs
index 9818834..64b570a 100644
--- a/libusr/src/io/error.rs
+++ b/libusr/src/io/error.rs
@@ -2,6 +2,7 @@ use libsys::error::Errno;
 
 #[derive(Debug)]
 pub struct Error {
+    #[allow(dead_code)]
     repr: Repr,
 }
 
diff --git a/libusr/src/io/mod.rs b/libusr/src/io/mod.rs
index ac29239..f4c9ee3 100644
--- a/libusr/src/io/mod.rs
+++ b/libusr/src/io/mod.rs
@@ -27,6 +27,6 @@ pub trait AsRawFd {
 pub fn stat(pathname: &str) -> Result<Stat, Error> {
     let mut buf = Stat::default();
     // TODO error handling
-    let res = sys_fstatat(None, pathname, &mut buf, 0).unwrap();
+    sys_fstatat(None, pathname, &mut buf, 0).unwrap();
     Ok(buf)
 }
diff --git a/libusr/src/io/stdio.rs b/libusr/src/io/stdio.rs
index de7fc99..17f8afe 100644
--- a/libusr/src/io/stdio.rs
+++ b/libusr/src/io/stdio.rs
@@ -1,40 +1,40 @@
-use libsys::{
-    stat::FileDescriptor,
-    calls::{sys_read, sys_write}
-};
-use crate::io::{Read, Write, Error};
-use crate::sync::{Mutex, MutexGuard};
+use crate::io::{Error, Read, Write};
+use crate::sync::Mutex;
 use core::fmt;
+use libsys::{
+    calls::{sys_read, sys_write},
+    stat::FileDescriptor,
+};
 
 struct InputInner {
-    fd: FileDescriptor
+    fd: FileDescriptor,
 }
 struct OutputInner {
-    fd: FileDescriptor
+    fd: FileDescriptor,
 }
 
-pub struct StdinLock<'a> {
-    lock: MutexGuard<'a, InputInner>
-}
-
-pub struct StdoutLock<'a> {
-    lock: MutexGuard<'a, OutputInner>
-}
-
-pub struct StderrLock<'a> {
-    lock: MutexGuard<'a, OutputInner>
-}
+//pub struct StdinLock<'a> {
+//    lock: MutexGuard<'a, InputInner>
+//}
+//
+//pub struct StdoutLock<'a> {
+//    lock: MutexGuard<'a, OutputInner>
+//}
+//
+//pub struct StderrLock<'a> {
+//    lock: MutexGuard<'a, OutputInner>
+//}
 
 pub struct Stdin {
     inner: &'static Mutex<InputInner>,
 }
 
 pub struct Stdout {
-    inner: &'static Mutex<OutputInner>
+    inner: &'static Mutex<OutputInner>,
 }
 
 pub struct Stderr {
-    inner: &'static Mutex<OutputInner>
+    inner: &'static Mutex<OutputInner>,
 }
 
 // STDIN
@@ -51,6 +51,14 @@ impl Read for Stdin {
     }
 }
 
+// impl Stdin {
+//     pub fn lock(&self) -> StdinLock {
+//         StdinLock {
+//             lock: self.inner.lock()
+//         }
+//     }
+// }
+
 // STDOUT/STDERR
 
 impl fmt::Write for OutputInner {
@@ -89,21 +97,21 @@ impl Write for Stderr {
     }
 }
 
-impl Stdout {
-    pub fn lock(&self) -> StdoutLock {
-        StdoutLock {
-            lock: self.inner.lock()
-        }
-    }
-}
-
-impl Stderr {
-    pub fn lock(&self) -> StderrLock {
-        StderrLock {
-            lock: self.inner.lock()
-        }
-    }
-}
+// impl Stdout {
+//     pub fn lock(&self) -> StdoutLock {
+//         StdoutLock {
+//             lock: self.inner.lock()
+//         }
+//     }
+// }
+//
+// impl Stderr {
+//     pub fn lock(&self) -> StderrLock {
+//         StderrLock {
+//             lock: self.inner.lock()
+//         }
+//     }
+// }
 
 lazy_static! {
     static ref STDIN: Mutex<InputInner> = Mutex::new(InputInner {
diff --git a/libusr/src/io/writer.rs b/libusr/src/io/writer.rs
index 30ed6d8..9ddcc08 100644
--- a/libusr/src/io/writer.rs
+++ b/libusr/src/io/writer.rs
@@ -1,5 +1,5 @@
 use core::fmt;
-use crate::io::{self, Write};
+use crate::io::Write;
 
 #[macro_export]
 macro_rules! print {
diff --git a/libusr/src/os.rs b/libusr/src/os.rs
index 85a385a..f7d0f10 100644
--- a/libusr/src/os.rs
+++ b/libusr/src/os.rs
@@ -1,7 +1,5 @@
 use crate::sys;
 use core::fmt;
-use core::mem::{size_of, MaybeUninit};
-use libsys::{ioctl::IoctlCmd, stat::FileDescriptor, termios::Termios};
 
 #[macro_export]
 macro_rules! trace {
diff --git a/libusr/src/signal.rs b/libusr/src/signal.rs
index e6fd5a0..f34793c 100644
--- a/libusr/src/signal.rs
+++ b/libusr/src/signal.rs
@@ -1,11 +1,15 @@
-use libsys::{calls::{sys_exit, sys_ex_sigreturn}, signal::Signal, proc::ExitCode};
-use crate::{trace, thread};
+use crate::trace;
+use libsys::{
+    calls::{sys_ex_sigreturn, sys_exit},
+    proc::ExitCode,
+    signal::Signal,
+};
 
 #[derive(Clone, Copy)]
 pub enum SignalHandler {
     Func(fn(Signal) -> ()),
     Ignore,
-    Terminate
+    Terminate,
 }
 
 // TODO per-thread signal handler table
diff --git a/libusr/src/sys/mod.rs b/libusr/src/sys/mod.rs
index 8a6ab86..9b43f6b 100644
--- a/libusr/src/sys/mod.rs
+++ b/libusr/src/sys/mod.rs
@@ -23,11 +23,6 @@ impl RawMutex {
         self.inner.compare_exchange_weak(false, true, Ordering::Acquire, Ordering::Relaxed).is_ok()
     }
 
-    #[inline]
-    unsafe fn is_locked(&self) -> bool {
-        self.inner.load(Ordering::Acquire)
-    }
-
     #[inline]
     pub unsafe fn lock(&self) {
         while !self.try_lock() {
diff --git a/libusr/src/thread.rs b/libusr/src/thread.rs
index 71df64e..266c11a 100644
--- a/libusr/src/thread.rs
+++ b/libusr/src/thread.rs
@@ -1,15 +1,13 @@
+use crate::signal;
 use alloc::{boxed::Box, sync::Arc, vec};
+use core::any::Any;
 use core::cell::UnsafeCell;
+use core::fmt;
 use core::mem::MaybeUninit;
 use libsys::{
-    calls::{sys_ex_clone, sys_ex_signal, sys_ex_thread_exit, sys_ex_thread_wait, sys_ex_gettid},
-    error::Errno,
+    calls::{sys_ex_clone, sys_ex_gettid, sys_ex_signal, sys_ex_thread_exit, sys_ex_thread_wait},
     proc::ExitCode,
 };
-use core::sync::atomic::{AtomicU32, Ordering};
-use core::any::Any;
-use crate::{trace, signal};
-use core::fmt;
 
 struct NativeData<F, T>
 where
@@ -24,7 +22,7 @@ where
 
 #[derive(Clone)]
 pub struct Thread {
-    id: u32
+    id: u32,
 }
 
 pub type ThreadResult<T> = Result<T, Box<dyn Any + Send + Sync>>;
@@ -32,7 +30,7 @@ pub type ThreadPacket<T> = Arc<UnsafeCell<MaybeUninit<ThreadResult<T>>>>;
 
 pub struct JoinHandle<T> {
     native: u32,
-    result: ThreadPacket<T>
+    result: ThreadPacket<T>,
 }
 
 impl Thread {
@@ -43,26 +41,33 @@ impl Thread {
 
 impl fmt::Debug for Thread {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        f.debug_struct("Thread").field("id", &self.id).finish_non_exhaustive()
+        f.debug_struct("Thread")
+            .field("id", &self.id)
+            .finish_non_exhaustive()
     }
 }
 
 impl<T> JoinHandle<T> {
     pub fn join(self) -> ThreadResult<T> {
         sys_ex_thread_wait(self.native).unwrap();
-        unsafe { Arc::try_unwrap(self.result).unwrap().into_inner().assume_init() }
+        unsafe {
+            Arc::try_unwrap(self.result)
+                .unwrap()
+                .into_inner()
+                .assume_init()
+        }
     }
 }
 
 unsafe fn init_common(signal_stack_pointer: *mut u8) {
-    let tid = sys_ex_gettid();
-    asm!("msr tpidr_el0, {}", in(reg) tid);
+    let tid = sys_ex_gettid() as u64;
+    asm!("msr tpidr_el0, {:x}", in(reg) tid);
 
     // thread::current() should be valid at this point
 
     sys_ex_signal(
         signal::signal_handler as usize,
-        signal_stack_pointer as usize
+        signal_stack_pointer as usize,
     )
     .unwrap();
 }
@@ -70,19 +75,19 @@ unsafe fn init_common(signal_stack_pointer: *mut u8) {
 pub(crate) unsafe fn init_main() {
     #[repr(align(16))]
     struct StackWrapper {
-        data: [u8; 8192]
+        data: [u8; 8192],
     }
     static mut STACK: StackWrapper = StackWrapper { data: [0; 8192] };
     init_common(STACK.data.as_mut_ptr().add(8192))
 }
 
 pub fn current() -> Thread {
-    let mut id: u32;
+    let mut id: u64;
     unsafe {
-        asm!("mrs {}, tpidr_el0", out(reg) id);
+        asm!("mrs {:x}, tpidr_el0", out(reg) id);
     }
 
-    Thread { id }
+    Thread { id: id as u32 }
 }
 
 pub fn spawn<F, T>(f: F) -> JoinHandle<T>
@@ -101,7 +106,7 @@ where
         F: Send + 'static,
         T: Send + 'static,
     {
-        let (stack, len) = {
+        let (_stack, _len) = {
             // Setup signal handling
             let mut signal_stack = vec![0u8; 8192];
 
@@ -123,7 +128,7 @@ where
         sys_ex_thread_exit(ExitCode::from(0));
     }
 
-    let native = unsafe {
+    let native = {
         let stack = stack.as_mut_ptr() as usize + stack.len();
         let data: *mut NativeData<F, T> = Box::into_raw(Box::new(NativeData {
             closure: f,
diff --git a/user/src/fuzzy/main.rs b/user/src/fuzzy/main.rs
index 8cde8fa..cfc7d4e 100644
--- a/user/src/fuzzy/main.rs
+++ b/user/src/fuzzy/main.rs
@@ -2,11 +2,13 @@
 #![no_std]
 #![no_main]
 
+#![allow(unused_macros)]
+#![allow(dead_code)]
+
 #[macro_use]
 extern crate libusr;
 
-use libusr::sys::{abi::SystemCall, stat::Stat, Signal};
-use libusr::signal::{self, SignalHandler};
+use libusr::sys::{abi::SystemCall, stat::Stat};
 
 static mut STATE: u64 = 0;
 
@@ -115,9 +117,10 @@ fn main() -> i32 {
 
     // Test sys_ex_getcputime()
     let mut prev_time = libusr::sys::sys_ex_getcputime().unwrap().as_nanos();
-    for _ in 0..100000 {
+    for _ in 0..1000 {
         let t = libusr::sys::sys_ex_getcputime().unwrap().as_nanos();
         assert!(t >= prev_time);
+        prev_time = t;
     }
 
     // Test non-utf8 input fed into syscalls expecting strings
diff --git a/user/src/shell/main.rs b/user/src/shell/main.rs
index 64ea822..b2a835e 100644
--- a/user/src/shell/main.rs
+++ b/user/src/shell/main.rs
@@ -6,7 +6,7 @@ extern crate libusr;
 extern crate alloc;
 
 use alloc::borrow::ToOwned;
-use libusr::sys::{sys_faccessat, sys_exit, sys_execve, sys_waitpid, sys_fork, ExitCode, Errno, AccessMode};
+use libusr::sys::{sys_exit, sys_execve, sys_waitpid, sys_fork, ExitCode, Errno};
 use libusr::io::{self, Read};
 
 fn readline<'a, F: Read>(f: &mut F, bytes: &'a mut [u8]) -> Result<Option<&'a str>, io::Error> {
@@ -19,7 +19,7 @@ fn readline<'a, F: Read>(f: &mut F, bytes: &'a mut [u8]) -> Result<Option<&'a st
 }
 
 fn execvp(cmd: &str) -> ! {
-    sys_execve(&("/bin/".to_owned() + cmd));
+    sys_execve(&("/bin/".to_owned() + cmd)).unwrap();
     sys_exit(ExitCode::from(-1));
 }
 
@@ -52,7 +52,7 @@ fn main() -> i32 {
             continue;
         }
 
-        execute(line);
+        execute(line).ok();
     }
     0
 }