diff --git a/src/fcntl.rs b/src/fcntl.rs
index ca0a226622..2e2d8aa212 100644
--- a/src/fcntl.rs
+++ b/src/fcntl.rs
@@ -7,7 +7,7 @@ pub use self::consts::*;
 pub use self::ffi::flock;
 
 // Re-export Fd defined in std
-pub type Fd = ::std::os::unix::io::Fd;
+pub type Fd = ::std::os::unix::io::RawFd;
 
 #[allow(dead_code)]
 mod ffi {
@@ -19,7 +19,7 @@ mod ffi {
         use libc::{c_int, c_short, off_t, pid_t};
 
         #[repr(C)]
-        #[derive(Copy)]
+        #[derive(Clone, Copy)]
         pub struct flock {
             pub l_type: c_short,
             pub l_whence: c_short,
@@ -47,7 +47,7 @@ mod ffi {
         use libc::{c_int, c_short, off_t, pid_t};
 
         #[repr(C)]
-        #[derive(Copy)]
+        #[derive(Clone, Copy)]
         pub struct flock {
             pub l_start: off_t,
             pub l_len: off_t,
diff --git a/src/lib.rs b/src/lib.rs
index 09d96509fa..3731d39cb2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -4,7 +4,7 @@
 //! defined in.
 #![crate_name = "nix"]
 
-#![feature(collections, core, io_ext, linkage, std_misc)]
+#![feature(collections, core, linkage, std_misc)]
 #![allow(non_camel_case_types)]
 
 #[macro_use]
diff --git a/src/sched.rs b/src/sched.rs
index 4b6c955f88..c1746f2e1b 100644
--- a/src/sched.rs
+++ b/src/sched.rs
@@ -89,7 +89,7 @@ pub type CpuMask = c_ulong;
 
 // Structure representing the CPU set to apply
 #[repr(C)]
-#[derive(Copy)]
+#[derive(Clone, Copy)]
 pub struct CpuSet {
     cpu_mask: [CpuMask; cpuset_attribs::CPU_SETSIZE/cpuset_attribs::CPU_MASK_BITS]
 }
diff --git a/src/sys/epoll.rs b/src/sys/epoll.rs
index a68a7b6f8f..1028af78f6 100644
--- a/src/sys/epoll.rs
+++ b/src/sys/epoll.rs
@@ -70,7 +70,7 @@ impl fmt::Debug for EpollEventKind {
     }
 }
 
-#[derive(Copy)]
+#[derive(Clone, Copy)]
 #[repr(C)]
 pub enum EpollOp {
     EpollCtlAdd = 1,
@@ -94,7 +94,7 @@ fn test_epoll_event_size() {
 }
 
 #[cfg(any(not(target_os = "android"), target_arch = "x86_64"))]
-#[derive(Copy)]
+#[derive(Clone, Copy)]
 #[repr(C, packed)]
 pub struct EpollEvent {
     pub events: EpollEventKind,
diff --git a/src/sys/event.rs b/src/sys/event.rs
index 9a0ede1e0d..c2c65dad21 100644
--- a/src/sys/event.rs
+++ b/src/sys/event.rs
@@ -13,7 +13,7 @@ mod ffi {
     pub use libc::{c_int, c_void, uintptr_t, intptr_t, timespec};
     use super::{EventFilter, EventFlag, FilterFlag};
 
-    #[derive(Copy)]
+    #[derive(Clone, Copy)]
     #[repr(C)]
     pub struct kevent {
         pub ident: uintptr_t,       // 8
@@ -40,7 +40,7 @@ mod ffi {
 }
 
 #[repr(i16)]
-#[derive(Copy, Debug, PartialEq)]
+#[derive(Clone, Copy, Debug, PartialEq)]
 pub enum EventFilter {
     EVFILT_READ = -1,
     EVFILT_WRITE = -2,
diff --git a/src/sys/ioctl.rs b/src/sys/ioctl.rs
index 5003a4f682..18b8b1abe4 100644
--- a/src/sys/ioctl.rs
+++ b/src/sys/ioctl.rs
@@ -8,7 +8,7 @@ pub use self::IoctlArg::*;
 mod ffi {
     use libc::c_ushort;
 
-    #[derive(Copy, Debug)]
+    #[derive(Clone, Copy, Debug)]
     pub struct Winsize {
         pub ws_row: c_ushort,
         pub ws_col: c_ushort,
diff --git a/src/sys/signal.rs b/src/sys/signal.rs
index 5dd974cc02..afeb9c6cb5 100644
--- a/src/sys/signal.rs
+++ b/src/sys/signal.rs
@@ -96,7 +96,7 @@ pub mod signal {
     // actually a giant union. Currently we're only interested in these fields,
     // however.
     #[repr(C)]
-    #[derive(Copy)]
+    #[derive(Clone, Copy)]
     pub struct siginfo {
         si_signo: libc::c_int,
         si_errno: libc::c_int,
@@ -117,14 +117,14 @@ pub mod signal {
 
     #[repr(C)]
     #[cfg(target_pointer_width = "32")]
-    #[derive(Copy)]
+    #[derive(Clone, Copy)]
     pub struct sigset_t {
         __val: [libc::c_ulong; 32],
     }
 
     #[repr(C)]
     #[cfg(target_pointer_width = "64")]
-    #[derive(Copy)]
+    #[derive(Clone, Copy)]
     pub struct sigset_t {
         __val: [libc::c_ulong; 16],
     }
@@ -249,7 +249,7 @@ pub mod signal {
     // This structure has more fields, but we're not all that interested in
     // them.
     #[repr(C)]
-    #[derive(Copy)]
+    #[derive(Clone, Copy)]
     pub struct siginfo {
         pub si_signo: libc::c_int,
         pub si_errno: libc::c_int,
@@ -297,7 +297,7 @@ mod ffi {
     }
 }
 
-#[derive(Copy)]
+#[derive(Clone, Copy)]
 pub struct SigSet {
     sigset: sigset_t
 }
diff --git a/src/sys/socket/addr.rs b/src/sys/socket/addr.rs
index 34028246bd..1ae5a9c3e1 100644
--- a/src/sys/socket/addr.rs
+++ b/src/sys/socket/addr.rs
@@ -275,7 +275,7 @@ impl fmt::Display for Ipv4Addr {
  *
  */
 
-#[derive(Copy)]
+#[derive(Clone, Copy)]
 pub struct Ipv6Addr(pub libc::in6_addr);
 
 impl Ipv6Addr {
diff --git a/src/sys/socket/mod.rs b/src/sys/socket/mod.rs
index 33d5830176..ea5c99167f 100644
--- a/src/sys/socket/mod.rs
+++ b/src/sys/socket/mod.rs
@@ -57,7 +57,7 @@ pub struct sockaddr_storage {
     pub __ss_pad2: [u8; 120],
 }
 
-#[derive(Copy, PartialEq, Eq, Debug, FromPrimitive)]
+#[derive(Clone, Copy, PartialEq, Eq, Debug, FromPrimitive)]
 #[repr(i32)]
 pub enum SockType {
     Stream = consts::SOCK_STREAM,
@@ -78,7 +78,7 @@ bitflags!(
 /// Create an endpoint for communication
 ///
 /// [Further reading](http://man7.org/linux/man-pages/man2/socket.2.html)
-pub fn socket(domain: AddressFamily, ty: SockType, flags: SockFlag) -> Result<Fd> {
+pub fn socket(domain: AddressFamily, ty: SockType, flags: SockFlag) -> Result<RawFd> {
     let mut ty = ty as c_int;
     let feat_atomic = features::socket_atomic_cloexec();
 
@@ -109,7 +109,7 @@ pub fn socket(domain: AddressFamily, ty: SockType, flags: SockFlag) -> Result<Fd
 /// Listen for connections on a socket
 ///
 /// [Further reading](http://man7.org/linux/man-pages/man2/listen.2.html)
-pub fn listen(sockfd: Fd, backlog: usize) -> Result<()> {
+pub fn listen(sockfd: RawFd, backlog: usize) -> Result<()> {
     let res = unsafe { ffi::listen(sockfd, backlog as c_int) };
     from_ffi(res)
 }
@@ -117,7 +117,7 @@ pub fn listen(sockfd: Fd, backlog: usize) -> Result<()> {
 /// Bind a name to a socket
 ///
 /// [Further reading](http://man7.org/linux/man-pages/man2/bind.2.html)
-pub fn bind(fd: Fd, addr: &SockAddr) -> Result<()> {
+pub fn bind(fd: RawFd, addr: &SockAddr) -> Result<()> {
     let res = unsafe {
         let (ptr, len) = addr.as_ffi_pair();
         ffi::bind(fd, ptr, len)
@@ -129,7 +129,7 @@ pub fn bind(fd: Fd, addr: &SockAddr) -> Result<()> {
 /// Accept a connection on a socket
 ///
 /// [Further reading](http://man7.org/linux/man-pages/man2/accept.2.html)
-pub fn accept(sockfd: Fd) -> Result<Fd> {
+pub fn accept(sockfd: RawFd) -> Result<RawFd> {
     let res = unsafe { ffi::accept(sockfd, ptr::null_mut(), ptr::null_mut()) };
 
     if res < 0 {
@@ -143,7 +143,7 @@ pub fn accept(sockfd: Fd) -> Result<Fd> {
 ///
 /// [Further reading](http://man7.org/linux/man-pages/man2/accept.2.html)
 #[cfg(not(any(target_os = "macos", target_os = "ios", target_os = "android")))]
-pub fn accept4(sockfd: Fd, flags: SockFlag) -> Result<Fd> {
+pub fn accept4(sockfd: RawFd, flags: SockFlag) -> Result<RawFd> {
     use libc::sockaddr;
 
     type F = unsafe extern "C" fn(c_int, *mut sockaddr, *mut socklen_t, c_int) -> c_int;
@@ -173,12 +173,12 @@ pub fn accept4(sockfd: Fd, flags: SockFlag) -> Result<Fd> {
 ///
 /// [Further reading](http://man7.org/linux/man-pages/man2/accept.2.html)
 #[cfg(any(target_os = "macos", target_os = "ios", target_os = "android"))]
-pub fn accept4(sockfd: Fd, flags: SockFlag) -> Result<Fd> {
+pub fn accept4(sockfd: RawFd, flags: SockFlag) -> Result<RawFd> {
     accept4_polyfill(sockfd, flags)
 }
 
 #[inline]
-fn accept4_polyfill(sockfd: Fd, flags: SockFlag) -> Result<Fd> {
+fn accept4_polyfill(sockfd: RawFd, flags: SockFlag) -> Result<RawFd> {
     let res =  unsafe { ffi::accept(sockfd, ptr::null_mut(), ptr::null_mut()) };
 
     if res < 0 {
@@ -199,7 +199,7 @@ fn accept4_polyfill(sockfd: Fd, flags: SockFlag) -> Result<Fd> {
 /// Initiate a connection on a socket
 ///
 /// [Further reading](http://man7.org/linux/man-pages/man2/connect.2.html)
-pub fn connect(fd: Fd, addr: &SockAddr) -> Result<()> {
+pub fn connect(fd: RawFd, addr: &SockAddr) -> Result<()> {
     let res = unsafe {
         let (ptr, len) = addr.as_ffi_pair();
         ffi::connect(fd, ptr, len)
@@ -212,7 +212,7 @@ pub fn connect(fd: Fd, addr: &SockAddr) -> Result<()> {
 /// the number of bytes read and the socket address of the sender.
 ///
 /// [Further reading](http://man7.org/linux/man-pages/man2/recvmsg.2.html)
-pub fn recvfrom(sockfd: Fd, buf: &mut [u8]) -> Result<(usize, SockAddr)> {
+pub fn recvfrom(sockfd: RawFd, buf: &mut [u8]) -> Result<(usize, SockAddr)> {
     unsafe {
         let addr: sockaddr_storage = mem::zeroed();
         let mut len = mem::size_of::<sockaddr_storage>() as socklen_t;
@@ -234,7 +234,7 @@ pub fn recvfrom(sockfd: Fd, buf: &mut [u8]) -> Result<(usize, SockAddr)> {
     }
 }
 
-pub fn sendto(fd: Fd, buf: &[u8], addr: &SockAddr, flags: SockMessageFlags) -> Result<usize> {
+pub fn sendto(fd: RawFd, buf: &[u8], addr: &SockAddr, flags: SockMessageFlags) -> Result<usize> {
     let ret = unsafe {
         let (ptr, len) = addr.as_ffi_pair();
         ffi::sendto(fd, buf.as_ptr() as *const c_void, buf.len() as size_t, flags, ptr, len)
@@ -248,7 +248,7 @@ pub fn sendto(fd: Fd, buf: &[u8], addr: &SockAddr, flags: SockMessageFlags) -> R
 }
 
 #[repr(C)]
-#[derive(Copy, Debug)]
+#[derive(Clone, Copy, Debug)]
 pub struct linger {
     pub l_onoff: c_int,
     pub l_linger: c_int
@@ -284,30 +284,30 @@ pub trait SockOpt : Copy + fmt::Debug {
     type Set;
 
     #[doc(hidden)]
-    fn get(&self, fd: Fd, level: c_int) -> Result<Self::Get>;
+    fn get(&self, fd: RawFd, level: c_int) -> Result<Self::Get>;
 
     #[doc(hidden)]
-    fn set(&self, fd: Fd, level: c_int, val: Self::Set) -> Result<()>;
+    fn set(&self, fd: RawFd, level: c_int, val: Self::Set) -> Result<()>;
 }
 
 /// Get the current value for the requested socket option
 ///
 /// [Further reading](http://man7.org/linux/man-pages/man2/setsockopt.2.html)
-pub fn getsockopt<O: SockOpt>(fd: Fd, level: SockLevel, opt: O) -> Result<O::Get> {
+pub fn getsockopt<O: SockOpt>(fd: RawFd, level: SockLevel, opt: O) -> Result<O::Get> {
     opt.get(fd, level as c_int)
 }
 
 /// Sets the value for the requested socket option
 ///
 /// [Further reading](http://man7.org/linux/man-pages/man2/setsockopt.2.html)
-pub fn setsockopt<O: SockOpt>(fd: Fd, level: SockLevel, opt: O, val: O::Set) -> Result<()> {
+pub fn setsockopt<O: SockOpt>(fd: RawFd, level: SockLevel, opt: O, val: O::Set) -> Result<()> {
     opt.set(fd, level as c_int, val)
 }
 
 /// Get the address of the peer connected to the socket `fd`.
 ///
 /// [Further reading](http://man7.org/linux/man-pages/man2/getpeername.2.html)
-pub fn getpeername(fd: Fd) -> Result<SockAddr> {
+pub fn getpeername(fd: RawFd) -> Result<SockAddr> {
     unsafe {
         let addr: sockaddr_storage = mem::uninitialized();
         let mut len = mem::size_of::<sockaddr_storage>() as socklen_t;
@@ -325,7 +325,7 @@ pub fn getpeername(fd: Fd) -> Result<SockAddr> {
 /// Get the current address to which the socket `fd` is bound.
 ///
 /// [Further reading](http://man7.org/linux/man-pages/man2/getsockname.2.html)
-pub fn getsockname(fd: Fd) -> Result<SockAddr> {
+pub fn getsockname(fd: RawFd) -> Result<SockAddr> {
     unsafe {
         let addr: sockaddr_storage = mem::uninitialized();
         let mut len = mem::size_of::<sockaddr_storage>() as socklen_t;
diff --git a/src/sys/socket/multicast.rs b/src/sys/socket/multicast.rs
index f40de76240..1efac40c11 100644
--- a/src/sys/socket/multicast.rs
+++ b/src/sys/socket/multicast.rs
@@ -3,7 +3,7 @@ use libc::in_addr;
 use std::fmt;
 
 #[repr(C)]
-#[derive(Copy)]
+#[derive(Clone, Copy)]
 pub struct ip_mreq {
     pub imr_multiaddr: in_addr,
     pub imr_interface: in_addr,
diff --git a/src/sys/socket/sockopt.rs b/src/sys/socket/sockopt.rs
index 9a06d19806..dc93f08513 100644
--- a/src/sys/socket/sockopt.rs
+++ b/src/sys/socket/sockopt.rs
@@ -4,7 +4,7 @@ use errno::Errno;
 use sys::time::TimeVal;
 use libc::{c_int, uint8_t, c_void, socklen_t};
 use std::mem;
-use std::os::unix::io::Fd;
+use std::os::unix::io::RawFd;
 
 // Helper to generate the sockopt accessors
 // TODO: Figure out how to ommit gets when not supported by opt
@@ -22,14 +22,14 @@ macro_rules! sockopt_impl {
     };
 
     ($name:ident, $flag:path, $get_ty:ty, $getter:ty, $set_ty:ty, $setter:ty) => {
-        #[derive(Copy, Debug)]
+        #[derive(Clone, Copy, Debug)]
         pub struct $name;
 
         impl<'a> SockOpt for $name {
             type Get = $get_ty;
             type Set = $set_ty;
 
-            fn get(&self, fd: Fd, level: c_int) -> Result<$get_ty> {
+            fn get(&self, fd: RawFd, level: c_int) -> Result<$get_ty> {
                 unsafe {
                     let mut getter: $getter = Get::blank();
 
@@ -46,7 +46,7 @@ macro_rules! sockopt_impl {
                 }
             }
 
-            fn set(&self, fd: Fd, level: c_int, val: $set_ty) -> Result<()> {
+            fn set(&self, fd: RawFd, level: c_int, val: $set_ty) -> Result<()> {
                 unsafe {
                     let setter: $setter = Set::new(val);
 
diff --git a/src/sys/termios.rs b/src/sys/termios.rs
index c5758fe090..57612f0bf6 100644
--- a/src/sys/termios.rs
+++ b/src/sys/termios.rs
@@ -98,7 +98,7 @@ mod ffi {
         pub type speed_t = c_ulong;
 
         #[repr(C)]
-        #[derive(Copy)]
+        #[derive(Clone, Copy)]
         pub struct Termios {
             pub c_iflag: InputFlags,
             pub c_oflag: OutputFlags,
@@ -224,7 +224,7 @@ mod ffi {
 
         // XXX: We're using `repr(C)` because `c_int` doesn't work here.
         // See https://github.com/rust-lang/rust/issues/10374.
-        #[derive(Copy)]
+        #[derive(Clone, Copy)]
         #[repr(C)]
         pub enum SetArg {
             TCSANOW   = 0,
@@ -235,7 +235,7 @@ mod ffi {
 
         // XXX: We're using `repr(C)` because `c_int` doesn't work here.
         // See https://github.com/rust-lang/rust/issues/10374.
-        #[derive(Copy)]
+        #[derive(Clone, Copy)]
         #[repr(C)]
         pub enum FlushArg {
             TCIFLUSH  = 1,
@@ -245,7 +245,7 @@ mod ffi {
 
         // XXX: We're using `repr(C)` because `c_int` doesn't work here.
         // See https://github.com/rust-lang/rust/issues/10374.
-        #[derive(Copy)]
+        #[derive(Clone, Copy)]
         #[repr(C)]
         pub enum FlowArg {
             TCOOFF = 1,
@@ -264,7 +264,7 @@ mod ffi {
         pub type speed_t = c_uint;
 
         #[repr(C)]
-        #[derive(Copy)]
+        #[derive(Clone, Copy)]
         pub struct Termios {
             pub c_iflag: InputFlags,
             pub c_oflag: OutputFlags,
@@ -378,7 +378,7 @@ mod ffi {
 
         // XXX: We're using `repr(C)` because `c_int` doesn't work here.
         // See https://github.com/rust-lang/rust/issues/10374.
-        #[derive(Copy)]
+        #[derive(Clone, Copy)]
         #[repr(C)]
         pub enum SetArg {
             TCSANOW   = 0,
@@ -388,7 +388,7 @@ mod ffi {
 
         // XXX: We're using `repr(C)` because `c_int` doesn't work here.
         // See https://github.com/rust-lang/rust/issues/10374.
-        #[derive(Copy)]
+        #[derive(Clone, Copy)]
         #[repr(C)]
         pub enum FlushArg {
             TCIFLUSH  = 0,
@@ -398,7 +398,7 @@ mod ffi {
 
         // XXX: We're using `repr(C)` because `c_int` doesn't work here.
         // See https://github.com/rust-lang/rust/issues/10374.
-        #[derive(Copy)]
+        #[derive(Clone, Copy)]
         #[repr(C)]
         pub enum FlowArg {
             TCOOFF = 0,
diff --git a/src/sys/utsname.rs b/src/sys/utsname.rs
index 69683bf6e9..7eeb323b2a 100644
--- a/src/sys/utsname.rs
+++ b/src/sys/utsname.rs
@@ -28,6 +28,9 @@ pub struct UtsName {
     domainname: [c_char; UTSNAME_LEN]
 }
 
+// workaround for `derive(Clone)` not working for fixed-length arrays
+impl Clone for UtsName { fn clone(&self) -> UtsName { *self } }
+
 impl UtsName {
     pub fn sysname<'a>(&'a self) -> &'a str {
         to_str(&(&self.sysname as *const c_char ) as *const *const c_char)
diff --git a/src/sys/wait.rs b/src/sys/wait.rs
index 6772dd900b..a6bccd8a87 100644
--- a/src/sys/wait.rs
+++ b/src/sys/wait.rs
@@ -16,7 +16,7 @@ bitflags!(
     }
 );
 
-#[derive(Copy)]
+#[derive(Clone, Copy)]
 pub enum WaitStatus {
     Exited(pid_t),
     StillAlive
diff --git a/src/unistd.rs b/src/unistd.rs
index 9df6cd766e..64203f0226 100644
--- a/src/unistd.rs
+++ b/src/unistd.rs
@@ -44,7 +44,7 @@ mod ffi {
     }
 }
 
-#[derive(Copy)]
+#[derive(Clone, Copy)]
 pub enum Fork {
     Parent(pid_t),
     Child
diff --git a/test/test.rs b/test/test.rs
index 7e30fb1931..be1e0ad883 100644
--- a/test/test.rs
+++ b/test/test.rs
@@ -1,5 +1,3 @@
-#![feature(convert, io_ext)]
-
 extern crate nix;
 extern crate libc;
 extern crate rand;