diff --git a/kernel/src/init.rs b/kernel/src/init.rs
index 79e7459..0b5f408 100644
--- a/kernel/src/init.rs
+++ b/kernel/src/init.rs
@@ -33,7 +33,7 @@ pub extern "C" fn init_fn(_arg: usize) -> ! {
     let node = ioctx.find(None, "/init", true).unwrap();
     let file = node.open(OpenFlags::O_RDONLY | OpenFlags::O_EXEC).unwrap();
 
-    proc.set_ioctx(ioctx);
+    proc.io.lock().set_ioctx(ioctx);
 
     // Open stdin/stdout/stderr
     {
diff --git a/kernel/src/proc/io.rs b/kernel/src/proc/io.rs
new file mode 100644
index 0000000..ed37cb8
--- /dev/null
+++ b/kernel/src/proc/io.rs
@@ -0,0 +1,85 @@
+//! Process file descriptors and I/O context
+use alloc::collections::BTreeMap;
+use error::Errno;
+use vfs::{FileRef, Ioctx};
+
+/// Process I/O context. Contains file tables, root/cwd info etc.
+pub struct ProcessIo {
+    ioctx: Option<Ioctx>,
+    files: BTreeMap<usize, FileRef>,
+}
+
+impl ProcessIo {
+    /// Clones this I/O context
+    pub fn fork(&self) -> Result<ProcessIo, Errno> {
+        // TODO
+        let mut dst = ProcessIo::new();
+        for (&fd, entry) in self.files.iter() {
+            dst.files.insert(fd, entry.clone());
+        }
+        dst.ioctx = self.ioctx.clone();
+        Ok(dst)
+    }
+
+    /// Returns [File] struct referred to by file descriptor `idx`
+    pub fn file(&mut self, idx: usize) -> Result<FileRef, Errno> {
+        self.files.get(&idx).cloned().ok_or(Errno::InvalidFile)
+    }
+
+    /// Returns [Ioctx] structure reference of this I/O context
+    pub fn ioctx(&mut self) -> &mut Ioctx {
+        self.ioctx.as_mut().unwrap()
+    }
+
+    /// Allocates a file descriptor and associates a [File] struct with it
+    pub fn place_file(&mut self, file: FileRef) -> Result<usize, Errno> {
+        for idx in 0..64 {
+            if self.files.get(&idx).is_none() {
+                self.files.insert(idx, file);
+                return Ok(idx);
+            }
+        }
+        Err(Errno::TooManyDescriptors)
+    }
+
+    /// Performs [File] close and releases its associated file descriptor `idx`
+    pub fn close_file(&mut self, idx: usize) -> Result<(), Errno> {
+        let res = self.files.remove(&idx);
+        assert!(res.is_some());
+        Ok(())
+    }
+
+    /// Constructs a new I/O context
+    pub fn new() -> Self {
+        Self {
+            files: BTreeMap::new(),
+            ioctx: None,
+        }
+    }
+
+    /// Assigns a descriptor number to an open file. If the number is not available,
+    /// returns [Errno::AlreadyExists].
+    pub fn set_file(&mut self, idx: usize, file: FileRef) -> Result<(), Errno> {
+        if self.files.get(&idx).is_none() {
+            self.files.insert(idx, file);
+            Ok(())
+        } else {
+            Err(Errno::AlreadyExists)
+        }
+    }
+
+    /// Changes process I/O context: root and cwd
+    pub fn set_ioctx(&mut self, ioctx: Ioctx) {
+        self.ioctx.replace(ioctx);
+    }
+
+    pub(super) fn handle_cloexec(&mut self) {
+        self.files.retain(|_, entry| !entry.borrow().is_cloexec());
+    }
+}
+
+impl Default for ProcessIo {
+    fn default() -> Self {
+        Self::new()
+    }
+}
diff --git a/kernel/src/proc/mod.rs b/kernel/src/proc/mod.rs
index 1876305..42f084f 100644
--- a/kernel/src/proc/mod.rs
+++ b/kernel/src/proc/mod.rs
@@ -7,6 +7,8 @@ use alloc::collections::BTreeMap;
 pub mod elf;
 pub mod process;
 pub use process::{Pid, Process, ProcessRef, State as ProcessState};
+pub mod io;
+pub use io::ProcessIo;
 
 pub mod wait;
 
diff --git a/kernel/src/proc/process.rs b/kernel/src/proc/process.rs
index 42127ab..027338e 100644
--- a/kernel/src/proc/process.rs
+++ b/kernel/src/proc/process.rs
@@ -5,15 +5,13 @@ use crate::mem::{
     phys::{self, PageUsage},
     virt::{MapAttributes, Space},
 };
-use crate::proc::{PROCESSES, SCHED};
+use crate::proc::{ProcessIo, PROCESSES, SCHED};
 use crate::sync::IrqSafeSpinLock;
-use alloc::{collections::BTreeMap, rc::Rc};
+use alloc::rc::Rc;
 use core::cell::UnsafeCell;
 use core::fmt;
 use core::sync::atomic::{AtomicU32, Ordering};
 use error::Errno;
-use vfs::FileRef;
-use vfs::Ioctx;
 
 pub use crate::arch::platform::context::{self, Context};
 
@@ -51,12 +49,6 @@ struct ProcessInner {
     exit: Option<ExitCode>,
 }
 
-/// Process I/O context. Contains file tables, root/cwd info etc.
-pub struct ProcessIo {
-    ioctx: Option<Ioctx>,
-    files: BTreeMap<usize, FileRef>,
-}
-
 /// Structure describing an operating system process
 #[allow(dead_code)]
 pub struct Process {
@@ -138,85 +130,10 @@ impl fmt::Display for Pid {
     }
 }
 
-impl ProcessIo {
-    /// Clones this I/O context
-    pub fn fork(&self) -> Result<ProcessIo, Errno> {
-        // TODO
-        let mut dst = ProcessIo::new();
-        for (&fd, entry) in self.files.iter() {
-            dst.files.insert(fd, entry.clone());
-        }
-        dst.ioctx = self.ioctx.clone();
-        Ok(dst)
-    }
-
-    /// Returns [File] struct referred to by file descriptor `idx`
-    pub fn file(&mut self, idx: usize) -> Result<FileRef, Errno> {
-        self.files.get(&idx).cloned().ok_or(Errno::InvalidFile)
-    }
-
-    /// Returns [Ioctx] structure reference of this I/O context
-    pub fn ioctx(&mut self) -> &mut Ioctx {
-        self.ioctx.as_mut().unwrap()
-    }
-
-    /// Allocates a file descriptor and associates a [File] struct with it
-    pub fn place_file(&mut self, file: FileRef) -> Result<usize, Errno> {
-        for idx in 0..64 {
-            if self.files.get(&idx).is_none() {
-                self.files.insert(idx, file);
-                return Ok(idx);
-            }
-        }
-        Err(Errno::TooManyDescriptors)
-    }
-
-    /// Performs [File] close and releases its associated file descriptor `idx`
-    pub fn close_file(&mut self, idx: usize) -> Result<(), Errno> {
-        let res = self.files.remove(&idx);
-        assert!(res.is_some());
-        Ok(())
-    }
-
-    /// Constructs a new I/O context
-    pub fn new() -> Self {
-        Self {
-            files: BTreeMap::new(),
-            ioctx: None,
-        }
-    }
-
-    /// Assigns a descriptor number to an open file. If the number is not available,
-    /// returns [Errno::AlreadyExists].
-    pub fn set_file(&mut self, idx: usize, file: FileRef) -> Result<(), Errno> {
-        if self.files.get(&idx).is_none() {
-            self.files.insert(idx, file);
-            Ok(())
-        } else {
-            Err(Errno::AlreadyExists)
-        }
-    }
-
-    fn handle_cloexec(&mut self) {
-        self.files.retain(|_, entry| !entry.borrow().is_cloexec());
-    }
-}
-
-impl Default for ProcessIo {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
 impl Process {
     const USTACK_VIRT_TOP: usize = 0x100000000;
     const USTACK_PAGES: usize = 4;
 
-    /// Changes process I/O context: root and cwd
-    pub fn set_ioctx(&self, ioctx: Ioctx) {
-        self.io.lock().ioctx = Some(ioctx);
-    }
-
     /// Returns currently executing process
     pub fn current() -> ProcessRef {
         SCHED.current_process()
diff --git a/kernel/src/syscall/mod.rs b/kernel/src/syscall/mod.rs
index 8dc1973..b893466 100644
--- a/kernel/src/syscall/mod.rs
+++ b/kernel/src/syscall/mod.rs
@@ -2,7 +2,7 @@
 
 use crate::arch::platform::exception::ExceptionFrame;
 use crate::debug::Level;
-use crate::proc::{elf, process::ProcessIo, wait, Pid, Process};
+use crate::proc::{elf, ProcessIo, wait, Pid, Process};
 use core::mem::size_of;
 use core::ops::DerefMut;
 use core::time::Duration;