diff --git a/src/sys.rs b/src/sys.rs
index baba460..2b1e3f1 100644
--- a/src/sys.rs
+++ b/src/sys.rs
@@ -1,58 +1,3 @@
-#[cfg(target_os = "linux")]
-pub mod eventfd {
-    use super::check_err;
-    use std::os::unix::io::RawFd;
-
-    pub type EfdFlags = libc::c_int;
-
-    pub fn eventfd(initval: libc::c_uint, flags: EfdFlags) -> Result<RawFd, std::io::Error> {
-        let res = unsafe { libc::eventfd(initval, flags) };
-
-        check_err(res).map(|r| r as RawFd)
-    }
-}
-
-#[cfg(target_os = "linux")]
-pub mod unistd {
-    use super::check_err;
-    use std::os::unix::io::RawFd;
-
-    pub fn close(fd: RawFd) -> Result<(), std::io::Error> {
-        let res = unsafe { libc::close(fd) };
-
-        check_err(res).map(drop)
-    }
-
-    pub fn dup(oldfd: RawFd) -> Result<RawFd, std::io::Error> {
-        let res = unsafe { libc::dup(oldfd) };
-        check_err(res)
-    }
-
-    pub fn read(fd: RawFd, buf: &mut [u8]) -> Result<usize, std::io::Error> {
-        let res = unsafe {
-            libc::read(
-                fd,
-                buf.as_mut_ptr() as *mut libc::c_void,
-                buf.len() as libc::size_t,
-            )
-        };
-
-        check_err(res as _).map(|r| r as usize)
-    }
-
-    pub fn write(fd: RawFd, buf: &[u8]) -> Result<usize, std::io::Error> {
-        let res = unsafe {
-            libc::write(
-                fd,
-                buf.as_ptr() as *const libc::c_void,
-                buf.len() as libc::size_t,
-            )
-        };
-
-        check_err(res as _).map(|r| r as usize)
-    }
-}
-
 #[cfg(unix)]
 pub mod fcntl {
     use super::check_err;