diff --git a/Cargo.lock b/Cargo.lock
index 4ded565..921bf80 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -13,9 +13,9 @@ dependencies = [
 
 [[package]]
 name = "autocfg"
-version = "1.3.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c4b4d0bd25bd0b74681c0ad21497610ce1b7c91b1022cd21c80c6fbdd9476b0"
+checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"
 
 [[package]]
 name = "bitflags"
@@ -58,9 +58,9 @@ checksum = "22ec99545bb0ed0ea7bb9b8e1e9122ea386ff8a48c0922e43f36d45ab09e0e80"
 
 [[package]]
 name = "dashmap"
-version = "6.0.1"
+version = "6.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "804c8821570c3f8b70230c2ba75ffa5c0f9a4189b9a432b6656c536712acae28"
+checksum = "5041cc499144891f3790297212f32a74fb938e5136a14943f338ef9e0ae276cf"
 dependencies = [
  "cfg-if",
  "crossbeam-utils",
@@ -171,9 +171,9 @@ checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
 
 [[package]]
 name = "libc"
-version = "0.2.158"
+version = "0.2.159"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d8adc4bb1803a324070e64a98ae98f38934d91957a99cfb3a43dcbc01bc56439"
+checksum = "561d97a539a36e26a9a5fad1ea11a3039a67714694aaa379433e580854bc3dc5"
 
 [[package]]
 name = "libm"
@@ -193,9 +193,12 @@ dependencies = [
 
 [[package]]
 name = "once_cell"
-version = "1.19.0"
+version = "1.20.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3fdb12b2476b595f9358c5161aa467c2438859caa136dec86c26fdd2efe17b92"
+checksum = "82881c4be219ab5faaf2ad5e5e5ecdff8c66bd7402ca3160975c93b24961afd1"
+dependencies = [
+ "portable-atomic",
+]
 
 [[package]]
 name = "parking_lot"
@@ -237,6 +240,12 @@ dependencies = [
  "vfs_rpc",
 ]
 
+[[package]]
+name = "portable-atomic"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cc9c68a3f6da06753e9335d63e27f6b9754dd1920d941135b7ea8224f141adb2"
+
 [[package]]
 name = "postcard"
 version = "1.0.10"
@@ -282,18 +291,18 @@ dependencies = [
 
 [[package]]
 name = "redox_syscall"
-version = "0.5.3"
+version = "0.5.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2a908a6e00f1fdd0dfd9c0eb08ce85126f6d8bbda50017e74bc4a4b7d4a926a4"
+checksum = "9b6dfecf2c74bce2466cabf93f6664d6998a69eb21e39f4207930065b27b771f"
 dependencies = [
  "bitflags",
 ]
 
 [[package]]
 name = "rustc_version"
-version = "0.4.0"
+version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bfa0f585226d2e68097d4f95d113b15b83a82e819ab25717ec0590d9584ef366"
+checksum = "cfcb3a22ef46e85b45de6ee7e79d063319ebb6594faafcf1c225ea92ab6e9b92"
 dependencies = [
  "semver",
 ]
@@ -312,22 +321,18 @@ checksum = "61697e0a1c7e512e84a621326239844a24d8207b4669b41bc18b32ea5cbf988b"
 
 [[package]]
 name = "serde"
-version = "1.0.209"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "99fce0ffe7310761ca6bf9faf5115afbc19688edd00171d81b1bb1b116c63e09"
+version = "1.0.210"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde_derive"
-version = "1.0.209"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a5831b979fd7b5439637af1752d535ff49f4860c0f341d1baeb6faf0f4242170"
+version = "1.0.210"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 2.0.76",
+ "syn 2.0.79",
 ]
 
 [[package]]
@@ -373,9 +378,9 @@ dependencies = [
 
 [[package]]
 name = "syn"
-version = "2.0.76"
+version = "2.0.79"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "578e081a14e0cefc3279b0472138c513f37b41a08d5a3cca9b6e4e8ceb6cd525"
+checksum = "89132cd0bf050864e1d38dc3bbc07a0eb8e7530af26344d3d2bbbef83499f590"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -409,9 +414,9 @@ dependencies = [
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.12"
+version = "1.0.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3354b9ac3fae1ff6755cb6db53683adb661634f67557942dea4facebec0fee4b"
+checksum = "e91b56cd4cadaeb79bbf1a5645f6b4f8dc5bde8834ad5894a8db35fda9efa1fe"
 
 [[package]]
 name = "uuid"
diff --git a/Cargo.toml b/Cargo.toml
index 498ce1a..e449f18 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -22,3 +22,7 @@ vfs_rpc = { version = "0.1.0", path = "../vfs/vfs_rpc" }
 # lto = true
 # opt-level = "z"
 # codegen-units=1
+
+[patch.crates-io]
+serde = { path = "../serde/serde" }
+serde_derive = { path = "../serde/serde_derive" }
diff --git a/src/main.rs b/src/main.rs
index 98793e6..a708a96 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,7 +1,7 @@
 use std::{
     fs::File,
     io::{Read, Seek, SeekFrom},
-    os::mikros::{ipc, syscalls},
+    os::mikros::{ipc, syscalls, Errno},
     path::Path,
     sync::{atomic::{AtomicU64, Ordering}, Arc},
 };
@@ -55,8 +55,8 @@ struct Serv {
 }
 
 impl dev_driver_rpc::Server for Serv {
-    fn open(&self, path: &std::path::Path) -> Result<u64, ()> {
-        let part = *(self.parts.get(path.to_str().unwrap()).ok_or(())?);
+    fn open(&self, path: &std::path::Path) -> Result<u64, Errno> {
+        let part = *(self.parts.get(path.to_str().unwrap()).ok_or(Errno::EBADF)?);
         Ok(self.open_files.insert(OpenFile {
             drive_file: part.0,
             offset: part.1,
@@ -67,35 +67,35 @@ impl dev_driver_rpc::Server for Serv {
 }
 
 impl file_rpc::Server for Serv {
-    fn read(&self, fd: u64, len: usize) -> Result<std::borrow::Cow<'_, [u8]>, ()> {
-        let file = &*self.open_files.get(fd as usize).ok_or(())?;
+    fn read(&self, fd: u64, len: usize) -> Result<std::borrow::Cow<'_, [u8]>, Errno> {
+        let file = &*self.open_files.get(fd as usize).ok_or(Errno::EBADF)?;
         if file.pos.load(Ordering::Relaxed).saturating_add(len as u64) > file.part_len as u64 {
-            return Err(());
+            return Err(Errno::EINVAL);
         }
 
         let file_client = file_rpc::Client::new(file.drive_file.0);
-        file_client.seek(file.drive_file.1, file_rpc::SeekFrom::Start(file.offset + file.pos.load(Ordering::Relaxed)));
+        file_client.seek(file.drive_file.1, file_rpc::SeekFrom::Start(file.offset + file.pos.load(Ordering::Relaxed)))?;
         Ok(file_client
             .read(file.drive_file.1, len)?
             .into())
     }
 
-    fn write(&self, _fd: u64, _data: &[u8]) -> Result<(), ()> {
+    fn write(&self, _fd: u64, _data: &[u8]) -> Result<(), Errno> {
         todo!()
     }
 
-    fn close(&self, _fd: u64) {}
+    fn close(&self, _fd: u64) -> Result<(), Errno> { Ok(()) }
 
-    fn size(&self, fd: u64) -> Option<u64> {
-        Some(self.open_files.get(fd as usize)?.part_len as u64)
+    fn size(&self, fd: u64) -> Result<u64, Errno> {
+        Ok(self.open_files.get(fd as usize).ok_or(Errno::EBADF)?.part_len as u64)
     }
 
-    fn dup(&self, fd: u64) -> Option<u64> {
-        let file = self.open_files.get(fd as usize)?.clone();
-        self.open_files.insert(file).map(|x| x as u64)
+    fn dup(&self, fd: u64) -> Result<u64, Errno> {
+        let file = self.open_files.get(fd as usize).ok_or(Errno::EBADF)?.clone();
+        self.open_files.insert(file).map(|x| x as u64).ok_or(Errno::ENOMEM)
     }
 
-    fn seek(&self, fd: u64, pos: file_rpc::SeekFrom) -> u64 {
+    fn seek(&self, fd: u64, pos: file_rpc::SeekFrom) -> Result<u64, Errno> {
         let file = &*self.open_files.get(fd as usize).unwrap();
         match pos {
             file_rpc::SeekFrom::Start(offset) => {
@@ -119,7 +119,7 @@ impl file_rpc::Server for Serv {
                 }
             },
         }
-        file.pos.load(Ordering::Relaxed)
+        Ok(file.pos.load(Ordering::Relaxed))
     }
 }