diff --git a/library/std/src/os/yggdrasil/io.rs b/library/std/src/os/yggdrasil/io.rs
index 21eb2250fbf..cb4a0a42193 100644
--- a/library/std/src/os/yggdrasil/io.rs
+++ b/library/std/src/os/yggdrasil/io.rs
@@ -151,8 +151,6 @@ pub mod owned {
 
     impl FromRawFd for OwnedFd {
         unsafe fn from_raw_fd(fd: RawFd) -> Self {
-            assert_ne!(fd, u32::MAX as RawFd);
-
             Self { fd }
         }
     }
@@ -165,7 +163,9 @@ pub mod owned {
 
     impl Drop for OwnedFd {
         fn drop(&mut self) {
-            todo!()
+            unsafe {
+                yggdrasil_rt::sys::close(self.fd).ok();
+            }
         }
     }
 
diff --git a/library/std/src/sys/yggdrasil/fs.rs b/library/std/src/sys/yggdrasil/fs.rs
deleted file mode 100644
index d3fcaffb702..00000000000
--- a/library/std/src/sys/yggdrasil/fs.rs
+++ /dev/null
@@ -1,432 +0,0 @@
-#![allow(dead_code)]
-
-use crate::ffi::{CStr, OsString};
-use crate::fmt;
-use crate::hash::{Hash, Hasher};
-use crate::io::{self, BorrowedCursor, IoSlice, IoSliceMut, SeekFrom};
-use crate::os::yggdrasil::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, RawFd};
-use crate::path::{Path, PathBuf};
-use crate::sys::fd::FileDesc;
-use crate::sys::time::SystemTime;
-use crate::sys_common::{AsInner, AsInnerMut, FromInner, IntoInner};
-
-#[derive(Debug)]
-pub struct File(FileDesc);
-
-pub struct FileAttr(!);
-pub struct FilePermissions(!);
-pub struct FileType(!);
-
-#[derive(Copy, Clone, Debug, Default)]
-pub struct FileTimes {}
-
-#[derive(Clone, Copy, Debug)]
-pub struct OpenOptions {
-    read: bool,
-    write: bool,
-    append: bool,
-    truncate: bool,
-    create: bool,
-    create_new: bool,
-    mode: i32,
-}
-
-pub struct DirEntry(!);
-pub struct ReadDir(!);
-#[derive(Debug)]
-pub struct DirBuilder {}
-
-impl OpenOptions {
-    pub fn new() -> Self {
-        todo!()
-    }
-
-    pub fn read(&mut self, _read: bool) {
-        todo!()
-    }
-
-    pub fn write(&mut self, _write: bool) {
-        todo!()
-    }
-
-    pub fn append(&mut self, _append: bool) {
-        todo!()
-    }
-
-    pub fn truncate(&mut self, _truncate: bool) {
-        todo!()
-    }
-
-    pub fn create(&mut self, _create: bool) {
-        todo!()
-    }
-
-    pub fn create_new(&mut self, _create_new: bool) {
-        todo!()
-    }
-}
-
-impl FileAttr {
-    pub fn size(&self) -> u64 {
-        todo!()
-    }
-
-    pub fn perm(&self) -> FilePermissions {
-        todo!()
-    }
-
-    pub fn file_type(&self) -> FileType {
-        todo!()
-    }
-
-    pub fn modified(&self) -> io::Result<SystemTime> {
-        todo!()
-    }
-
-    pub fn accessed(&self) -> io::Result<SystemTime> {
-        todo!()
-    }
-
-    pub fn created(&self) -> io::Result<SystemTime> {
-        todo!()
-    }
-}
-
-impl Clone for FileAttr {
-    fn clone(&self) -> Self {
-        todo!()
-    }
-}
-
-impl FilePermissions {
-    pub fn readonly(&self) -> bool {
-        todo!()
-    }
-
-    pub fn set_readonly(&mut self, _readonly: bool) {
-        todo!()
-    }
-}
-
-impl Clone for FilePermissions {
-    fn clone(&self) -> Self {
-        todo!()
-    }
-}
-
-impl PartialEq for FilePermissions {
-    fn eq(&self, _other: &Self) -> bool {
-        todo!()
-    }
-}
-
-impl Eq for FilePermissions {}
-
-impl fmt::Debug for FilePermissions {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        todo!()
-    }
-}
-
-impl FileType {
-    pub fn is_dir(&self) -> bool {
-        todo!()
-    }
-
-    pub fn is_file(&self) -> bool {
-        todo!()
-    }
-
-    pub fn is_symlink(&self) -> bool {
-        todo!()
-    }
-}
-
-impl Clone for FileType {
-    fn clone(&self) -> Self {
-        todo!()
-    }
-}
-
-impl Copy for FileType {}
-
-impl PartialEq for FileType {
-    fn eq(&self, _other: &Self) -> bool {
-        todo!()
-    }
-}
-
-impl Eq for FileType {}
-
-impl Hash for FileType {
-    fn hash<H: Hasher>(&self, _h: &mut H) {
-        todo!()
-    }
-}
-
-impl fmt::Debug for FileType {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        todo!()
-    }
-}
-
-impl FileTimes {
-    pub fn set_accessed(&mut self, _t: SystemTime) {
-        todo!()
-    }
-
-    pub fn set_modified(&mut self, _t: SystemTime) {
-        todo!()
-    }
-}
-
-impl File {
-    pub fn open(_path: &Path, _opts: &OpenOptions) -> io::Result<File> {
-        todo!()
-        // run_path_with_cstr(path, |path| File::open_c(&path, opts))
-    }
-
-    pub fn open_c(_path: &CStr, _opts: &OpenOptions) -> io::Result<File> {
-        todo!()
-        // let mut flags = opts.get_access_mode()?;
-        // flags = flags | opts.get_creation_mode()?;
-
-        // let mode;
-        // if flags & O_CREAT == O_CREAT {
-        //     mode = opts.mode;
-        // } else {
-        //     mode = 0;
-        // }
-
-        // let fd = unsafe { cvt(abi::open(path.as_ptr(), flags, mode))? };
-        // Ok(File(unsafe { FileDesc::from_raw_fd(fd as i32) }))
-    }
-
-    pub fn file_attr(&self) -> io::Result<FileAttr> {
-        todo!()
-        // Err(Error::from_raw_os_error(22))
-    }
-
-    pub fn fsync(&self) -> io::Result<()> {
-        todo!()
-        // Err(Error::from_raw_os_error(22))
-    }
-
-    pub fn datasync(&self) -> io::Result<()> {
-        todo!()
-        // self.fsync()
-    }
-
-    pub fn truncate(&self, _size: u64) -> io::Result<()> {
-        todo!()
-        // Err(Error::from_raw_os_error(22))
-    }
-
-    pub fn read(&self, _buf: &mut [u8]) -> io::Result<usize> {
-        todo!()
-        // self.0.read(buf)
-    }
-
-    pub fn read_vectored(&self, _bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
-        todo!()
-        // crate::io::default_read_vectored(|buf| self.read(buf), bufs)
-    }
-
-    #[inline]
-    pub fn is_read_vectored(&self) -> bool {
-        todo!()
-        // false
-    }
-
-    pub fn read_buf(&self, _cursor: BorrowedCursor<'_>) -> io::Result<()> {
-        todo!()
-        // crate::io::default_read_buf(|buf| self.read(buf), cursor)
-    }
-
-    pub fn write(&self, _buf: &[u8]) -> io::Result<usize> {
-        todo!()
-        // self.0.write(buf)
-    }
-
-    pub fn write_vectored(&self, _bufs: &[IoSlice<'_>]) -> io::Result<usize> {
-        todo!()
-        // crate::io::default_write_vectored(|buf| self.write(buf), bufs)
-    }
-
-    #[inline]
-    pub fn is_write_vectored(&self) -> bool {
-        todo!()
-        // false
-    }
-
-    pub fn flush(&self) -> io::Result<()> {
-        todo!()
-        // Ok(())
-    }
-
-    pub fn seek(&self, _pos: SeekFrom) -> io::Result<u64> {
-        todo!()
-        // Err(Error::from_raw_os_error(22))
-    }
-
-    pub fn duplicate(&self) -> io::Result<File> {
-        todo!()
-        // Err(Error::from_raw_os_error(22))
-    }
-
-    pub fn set_permissions(&self, _perm: FilePermissions) -> io::Result<()> {
-        todo!()
-        // Err(Error::from_raw_os_error(22))
-    }
-
-    pub fn set_times(&self, _times: FileTimes) -> io::Result<()> {
-        todo!();
-        // Err(Error::from_raw_os_error(22))
-    }
-}
-
-impl Iterator for ReadDir {
-    type Item = io::Result<DirEntry>;
-
-    fn next(&mut self) -> Option<io::Result<DirEntry>> {
-        todo!()
-    }
-}
-
-impl fmt::Debug for ReadDir {
-    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        todo!()
-    }
-}
-
-impl DirEntry {
-    pub fn path(&self) -> PathBuf {
-        todo!()
-    }
-
-    pub fn file_name(&self) -> OsString {
-        todo!()
-    }
-
-    pub fn metadata(&self) -> io::Result<FileAttr> {
-        todo!()
-    }
-
-    pub fn file_type(&self) -> io::Result<FileType> {
-        todo!()
-    }
-}
-
-impl DirBuilder {
-    pub fn new() -> DirBuilder {
-        todo!()
-    }
-
-    pub fn mkdir(&self, _p: &Path) -> io::Result<()> {
-        todo!()
-    }
-}
-
-impl AsInner<FileDesc> for File {
-    fn as_inner(&self) -> &FileDesc {
-        todo!()
-    }
-}
-
-impl IntoInner<FileDesc> for File {
-    fn into_inner(self) -> FileDesc {
-        todo!()
-    }
-}
-
-impl AsInnerMut<FileDesc> for File {
-    fn as_inner_mut(&mut self) -> &mut FileDesc {
-        todo!()
-    }
-}
-
-impl FromInner<FileDesc> for File {
-    fn from_inner(_file_desc: FileDesc) -> Self {
-        todo!()
-    }
-}
-
-impl AsFd for File {
-    fn as_fd(&self) -> BorrowedFd<'_> {
-        todo!()
-    }
-}
-
-impl AsRawFd for File {
-    fn as_raw_fd(&self) -> RawFd {
-        todo!()
-    }
-}
-
-impl IntoRawFd for File {
-    fn into_raw_fd(self) -> RawFd {
-        todo!()
-    }
-}
-
-impl FromRawFd for File {
-    unsafe fn from_raw_fd(_raw_fd: RawFd) -> Self {
-        todo!()
-    }
-}
-
-pub fn readdir(_p: &Path) -> io::Result<ReadDir> {
-    todo!()
-}
-
-pub fn unlink(_p: &Path) -> io::Result<()> {
-    todo!()
-}
-
-pub fn rename(_old: &Path, _new: &Path) -> io::Result<()> {
-    todo!()
-}
-
-pub fn set_perm(_p: &Path, _perm: FilePermissions) -> io::Result<()> {
-    todo!()
-}
-
-pub fn remove_dir_all(_p: &Path) -> io::Result<()> {
-    todo!()
-}
-
-pub fn readlink(_p: &Path) -> io::Result<PathBuf> {
-    todo!()
-}
-
-pub fn symlink(_original: &Path, _link: &Path) -> io::Result<()> {
-    todo!()
-}
-
-pub fn link(_original: &Path, _link: &Path) -> io::Result<()> {
-    todo!()
-}
-
-pub fn stat(_p: &Path) -> io::Result<FileAttr> {
-    todo!()
-}
-
-pub fn lstat(_p: &Path) -> io::Result<FileAttr> {
-    todo!()
-}
-
-pub fn canonicalize(_p: &Path) -> io::Result<PathBuf> {
-    todo!()
-}
-
-pub fn rmdir(_p: &Path) -> io::Result<()> {
-    todo!()
-}
-
-pub fn copy(_from: &Path, _to: &Path) -> io::Result<u64> {
-    todo!()
-}
-
-pub fn try_exists(_path: &Path) -> io::Result<bool> {
-    todo!()
-}
diff --git a/library/std/src/sys/yggdrasil/fs/file.rs b/library/std/src/sys/yggdrasil/fs/file.rs
new file mode 100644
index 00000000000..f3f3f4d3d90
--- /dev/null
+++ b/library/std/src/sys/yggdrasil/fs/file.rs
@@ -0,0 +1,190 @@
+use crate::io::{self, BorrowedCursor, IoSlice, IoSliceMut, SeekFrom};
+use crate::os::yggdrasil::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, RawFd};
+use crate::path::Path;
+use crate::sys::cvt_io;
+use crate::sys::fd::FileDesc;
+use crate::sys_common::{AsInner, AsInnerMut, FromInner, IntoInner};
+
+use super::{FileAttr, FilePermissions, FileTimes};
+
+#[derive(Debug)]
+pub struct File(FileDesc);
+
+#[allow(dead_code)]
+#[derive(Clone, Copy, Debug, Default)]
+pub struct OpenOptions {
+    read: bool,
+    write: bool,
+    append: bool,
+    truncate: bool,
+    create: bool,
+    create_new: bool,
+    mode: i32,
+}
+
+impl OpenOptions {
+    pub fn new() -> Self {
+        Self { mode: 0o700, ..Default::default() }
+    }
+
+    pub fn read(&mut self, read: bool) {
+        self.read = read;
+    }
+
+    pub fn write(&mut self, write: bool) {
+        self.write = write;
+    }
+
+    pub fn append(&mut self, _append: bool) {
+        todo!()
+    }
+
+    pub fn truncate(&mut self, _truncate: bool) {
+        todo!()
+    }
+
+    pub fn create(&mut self, _create: bool) {
+        todo!()
+    }
+
+    pub fn create_new(&mut self, _create_new: bool) {
+        todo!()
+    }
+}
+
+impl Into<yggdrasil_rt::OpenFlags> for OpenOptions {
+    fn into(self) -> yggdrasil_rt::OpenFlags {
+        let mut res = yggdrasil_rt::OpenFlags::new();
+        if self.read {
+            res = res.read();
+        }
+        if self.write {
+            res = res.write();
+        }
+        res
+    }
+}
+
+impl File {
+    pub fn open(path: &Path, opts: &OpenOptions) -> io::Result<File> {
+        let path = path.as_os_str();
+        unsafe {
+            cvt_io(yggdrasil_rt::sys::open(path.to_str().unwrap(), (*opts).into()))
+                .map(|fd| File::from_raw_fd(fd))
+        }
+    }
+
+    pub fn file_attr(&self) -> io::Result<FileAttr> {
+        todo!()
+    }
+
+    pub fn fsync(&self) -> io::Result<()> {
+        todo!()
+    }
+
+    pub fn datasync(&self) -> io::Result<()> {
+        todo!()
+    }
+
+    pub fn truncate(&self, _size: u64) -> io::Result<()> {
+        todo!()
+    }
+
+    pub fn read(&self, buf: &mut [u8]) -> io::Result<usize> {
+        unsafe { cvt_io(yggdrasil_rt::sys::read(self.as_raw_fd(), buf)) }
+    }
+
+    pub fn read_vectored(&self, _bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
+        todo!()
+    }
+
+    #[inline]
+    pub fn is_read_vectored(&self) -> bool {
+        false
+    }
+
+    pub fn read_buf(&self, _cursor: BorrowedCursor<'_>) -> io::Result<()> {
+        todo!()
+    }
+
+    pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
+        unsafe { cvt_io(yggdrasil_rt::sys::write(self.as_raw_fd(), buf)) }
+    }
+
+    pub fn write_vectored(&self, _bufs: &[IoSlice<'_>]) -> io::Result<usize> {
+        todo!()
+    }
+
+    #[inline]
+    pub fn is_write_vectored(&self) -> bool {
+        false
+    }
+
+    pub fn flush(&self) -> io::Result<()> {
+        todo!()
+    }
+
+    pub fn seek(&self, _pos: SeekFrom) -> io::Result<u64> {
+        todo!()
+    }
+
+    pub fn duplicate(&self) -> io::Result<File> {
+        todo!()
+    }
+
+    pub fn set_permissions(&self, _perm: FilePermissions) -> io::Result<()> {
+        todo!()
+    }
+
+    pub fn set_times(&self, _times: FileTimes) -> io::Result<()> {
+        todo!();
+    }
+}
+
+impl AsInner<FileDesc> for File {
+    fn as_inner(&self) -> &FileDesc {
+        todo!()
+    }
+}
+
+impl IntoInner<FileDesc> for File {
+    fn into_inner(self) -> FileDesc {
+        todo!()
+    }
+}
+
+impl AsInnerMut<FileDesc> for File {
+    fn as_inner_mut(&mut self) -> &mut FileDesc {
+        todo!()
+    }
+}
+
+impl FromInner<FileDesc> for File {
+    fn from_inner(_file_desc: FileDesc) -> Self {
+        todo!()
+    }
+}
+
+impl AsFd for File {
+    fn as_fd(&self) -> BorrowedFd<'_> {
+        todo!()
+    }
+}
+
+impl AsRawFd for File {
+    fn as_raw_fd(&self) -> RawFd {
+        self.0.as_raw_fd()
+    }
+}
+
+impl IntoRawFd for File {
+    fn into_raw_fd(self) -> RawFd {
+        todo!()
+    }
+}
+
+impl FromRawFd for File {
+    unsafe fn from_raw_fd(raw_fd: RawFd) -> Self {
+        Self(FromRawFd::from_raw_fd(raw_fd))
+    }
+}
diff --git a/library/std/src/sys/yggdrasil/fs/mod.rs b/library/std/src/sys/yggdrasil/fs/mod.rs
new file mode 100644
index 00000000000..176cd5305e6
--- /dev/null
+++ b/library/std/src/sys/yggdrasil/fs/mod.rs
@@ -0,0 +1,234 @@
+use crate::ffi::OsString;
+use crate::fmt;
+use crate::hash::{Hash, Hasher};
+use crate::io;
+use crate::path::{Path, PathBuf};
+use crate::sys::time::SystemTime;
+
+mod file;
+
+pub use file::{File, OpenOptions};
+
+pub struct FileAttr(!);
+pub struct FilePermissions(!);
+pub struct FileType(!);
+
+#[derive(Copy, Clone, Debug, Default)]
+pub struct FileTimes {}
+
+pub struct DirEntry(!);
+pub struct ReadDir(!);
+#[derive(Debug)]
+pub struct DirBuilder {}
+
+impl FileAttr {
+    pub fn size(&self) -> u64 {
+        todo!()
+    }
+
+    pub fn perm(&self) -> FilePermissions {
+        todo!()
+    }
+
+    pub fn file_type(&self) -> FileType {
+        todo!()
+    }
+
+    pub fn modified(&self) -> io::Result<SystemTime> {
+        todo!()
+    }
+
+    pub fn accessed(&self) -> io::Result<SystemTime> {
+        todo!()
+    }
+
+    pub fn created(&self) -> io::Result<SystemTime> {
+        todo!()
+    }
+}
+
+impl Clone for FileAttr {
+    fn clone(&self) -> Self {
+        todo!()
+    }
+}
+
+impl FilePermissions {
+    pub fn readonly(&self) -> bool {
+        todo!()
+    }
+
+    pub fn set_readonly(&mut self, _readonly: bool) {
+        todo!()
+    }
+}
+
+impl Clone for FilePermissions {
+    fn clone(&self) -> Self {
+        todo!()
+    }
+}
+
+impl PartialEq for FilePermissions {
+    fn eq(&self, _other: &Self) -> bool {
+        todo!()
+    }
+}
+
+impl Eq for FilePermissions {}
+
+impl fmt::Debug for FilePermissions {
+    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        todo!()
+    }
+}
+
+impl FileType {
+    pub fn is_dir(&self) -> bool {
+        todo!()
+    }
+
+    pub fn is_file(&self) -> bool {
+        todo!()
+    }
+
+    pub fn is_symlink(&self) -> bool {
+        todo!()
+    }
+}
+
+impl Clone for FileType {
+    fn clone(&self) -> Self {
+        todo!()
+    }
+}
+
+impl Copy for FileType {}
+
+impl PartialEq for FileType {
+    fn eq(&self, _other: &Self) -> bool {
+        todo!()
+    }
+}
+
+impl Eq for FileType {}
+
+impl Hash for FileType {
+    fn hash<H: Hasher>(&self, _h: &mut H) {
+        todo!()
+    }
+}
+
+impl fmt::Debug for FileType {
+    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        todo!()
+    }
+}
+
+impl FileTimes {
+    pub fn set_accessed(&mut self, _t: SystemTime) {
+        todo!()
+    }
+
+    pub fn set_modified(&mut self, _t: SystemTime) {
+        todo!()
+    }
+}
+
+impl Iterator for ReadDir {
+    type Item = io::Result<DirEntry>;
+
+    fn next(&mut self) -> Option<io::Result<DirEntry>> {
+        todo!()
+    }
+}
+
+impl fmt::Debug for ReadDir {
+    fn fmt(&self, _f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        todo!()
+    }
+}
+
+impl DirEntry {
+    pub fn path(&self) -> PathBuf {
+        todo!()
+    }
+
+    pub fn file_name(&self) -> OsString {
+        todo!()
+    }
+
+    pub fn metadata(&self) -> io::Result<FileAttr> {
+        todo!()
+    }
+
+    pub fn file_type(&self) -> io::Result<FileType> {
+        todo!()
+    }
+}
+
+impl DirBuilder {
+    pub fn new() -> DirBuilder {
+        todo!()
+    }
+
+    pub fn mkdir(&self, _p: &Path) -> io::Result<()> {
+        todo!()
+    }
+}
+
+pub fn readdir(_p: &Path) -> io::Result<ReadDir> {
+    todo!()
+}
+
+pub fn unlink(_p: &Path) -> io::Result<()> {
+    todo!()
+}
+
+pub fn rename(_old: &Path, _new: &Path) -> io::Result<()> {
+    todo!()
+}
+
+pub fn set_perm(_p: &Path, _perm: FilePermissions) -> io::Result<()> {
+    todo!()
+}
+
+pub fn remove_dir_all(_p: &Path) -> io::Result<()> {
+    todo!()
+}
+
+pub fn readlink(_p: &Path) -> io::Result<PathBuf> {
+    todo!()
+}
+
+pub fn symlink(_original: &Path, _link: &Path) -> io::Result<()> {
+    todo!()
+}
+
+pub fn link(_original: &Path, _link: &Path) -> io::Result<()> {
+    todo!()
+}
+
+pub fn stat(_p: &Path) -> io::Result<FileAttr> {
+    todo!()
+}
+
+pub fn lstat(_p: &Path) -> io::Result<FileAttr> {
+    todo!()
+}
+
+pub fn canonicalize(_p: &Path) -> io::Result<PathBuf> {
+    todo!()
+}
+
+pub fn rmdir(_p: &Path) -> io::Result<()> {
+    todo!()
+}
+
+pub fn copy(_from: &Path, _to: &Path) -> io::Result<u64> {
+    todo!()
+}
+
+pub fn try_exists(_path: &Path) -> io::Result<bool> {
+    todo!()
+}
diff --git a/library/std/src/sys/yggdrasil/mod.rs b/library/std/src/sys/yggdrasil/mod.rs
index f1655804286..31a0dcc36ac 100644
--- a/library/std/src/sys/yggdrasil/mod.rs
+++ b/library/std/src/sys/yggdrasil/mod.rs
@@ -6,8 +6,6 @@ use crate::io::ErrorKind;
 pub mod cmath;
 #[path = "../unix/os_str.rs"]
 pub mod os_str;
-#[path = "../unix/path.rs"]
-pub mod path;
 #[path = "../unsupported/pipe.rs"]
 pub mod pipe;
 #[path = "../unsupported/process.rs"]
@@ -24,6 +22,7 @@ pub mod memchr;
 pub mod net;
 pub mod once;
 pub mod os;
+pub mod path;
 pub mod stdio;
 pub mod thread;
 pub mod thread_local_key;
@@ -31,6 +30,8 @@ pub mod time;
 
 pub(self) use yggdrasil_rt;
 
+use yggdrasil_rt::Error as OsError;
+
 #[doc(hidden)]
 pub trait IsNegative {
     fn is_negative(&self) -> bool;
@@ -61,7 +62,44 @@ impl IsNegative for i32 {
 
 impl_is_negative! { i8 i16 i64 isize }
 
+fn cvt_io_err(e: OsError) -> crate::io::Error {
+    match e {
+        OsError::DoesNotExist => {
+            crate::io::const_io_error!(ErrorKind::NotFound, "does not exist")
+        }
+        OsError::InvalidFile => {
+            crate::io::const_io_error!(ErrorKind::Other, "invalid file descriptor")
+        }
+        OsError::OutOfMemory => {
+            crate::io::const_io_error!(ErrorKind::OutOfMemory, "out of memory")
+        }
+        OsError::InvalidMemoryOperation => {
+            crate::io::const_io_error!(ErrorKind::InvalidData, "invalid memory operation")
+        }
+        OsError::AlreadyExists => {
+            crate::io::const_io_error!(ErrorKind::AlreadyExists, "already exists")
+        }
+        OsError::TimedOut => {
+            crate::io::const_io_error!(ErrorKind::TimedOut, "operation timed out")
+        }
+        OsError::IsADirectory => {
+            crate::io::const_io_error!(ErrorKind::IsADirectory, "is a directory")
+        }
+        OsError::InvalidArgument => {
+            crate::io::const_io_error!(ErrorKind::InvalidInput, "invalid argument")
+        }
+    }
+}
+
+pub fn cvt_io<T>(t: Result<T, OsError>) -> crate::io::Result<T> {
+    match t {
+        Ok(t) => Ok(t),
+        Err(e) => Err(cvt_io_err(e)),
+    }
+}
+
 pub fn cvt<T: IsNegative>(_t: T) -> crate::io::Result<T> {
+    println!("cvt!");
     loop {}
 }
 
@@ -70,14 +108,21 @@ where
     T: IsNegative,
     F: FnMut() -> T,
 {
+    println!("cvt_r!");
     loop {}
 }
 
 pub fn hashmap_random_keys() -> (u64, u64) {
+    unsafe {
+        yggdrasil_rt::sys::debug_trace("sys::yggdrasil::hashmap_random_keys()");
+    }
     loop {}
 }
 
 pub fn abort_internal() -> ! {
+    unsafe {
+        yggdrasil_rt::sys::debug_trace("sys::yggdrasil::abort_internal()");
+    }
     loop {}
 }
 
@@ -90,10 +135,16 @@ pub unsafe fn cleanup() {
 }
 
 pub fn decode_error_kind(_errno: i32) -> ErrorKind {
+    unsafe {
+        yggdrasil_rt::sys::debug_trace("sys::yggdrasil::decode_error_kind()");
+    }
     loop {}
 }
 
 pub fn unsupported() -> ! {
+    unsafe {
+        yggdrasil_rt::sys::debug_trace("sys::yggrdasil::unsupported()");
+    }
     loop {}
 }
 
diff --git a/library/std/src/sys/yggdrasil/path.rs b/library/std/src/sys/yggdrasil/path.rs
new file mode 100644
index 00000000000..1d7662bdcdd
--- /dev/null
+++ b/library/std/src/sys/yggdrasil/path.rs
@@ -0,0 +1,46 @@
+use crate::env;
+use crate::ffi::OsStr;
+use crate::io;
+use crate::path::{Path, PathBuf, Prefix};
+use yggdrasil_rt::path as rt_path;
+
+#[inline]
+pub fn is_sep_byte(b: u8) -> bool {
+    b == (rt_path::SEPARATOR as u8)
+}
+
+#[inline]
+pub fn is_verbatim_sep(b: u8) -> bool {
+    b == (rt_path::SEPARATOR as u8)
+}
+
+#[inline]
+pub fn parse_prefix(_: &OsStr) -> Option<Prefix<'_>> {
+    None
+}
+
+pub const MAIN_SEP_STR: &str = rt_path::SEPARATOR_STR;
+pub const MAIN_SEP: char = rt_path::SEPARATOR;
+
+pub(crate) fn absolute(path: &Path) -> io::Result<PathBuf> {
+    let mut components = path.strip_prefix(".").unwrap_or(path).components();
+    let path_os = path.as_os_str().bytes();
+
+    let mut normalized = if path.is_absolute() {
+        if path_os.starts_with(b"//") && !path_os.starts_with(b"///") {
+            components.next();
+            PathBuf::from("//")
+        } else {
+            PathBuf::new()
+        }
+    } else {
+        env::current_dir()?
+    };
+    normalized.extend(components);
+
+    if path_os.ends_with(b"/") {
+        normalized.push("");
+    }
+
+    Ok(normalized)
+}
diff --git a/library/std/src/sys/yggdrasil/stdio.rs b/library/std/src/sys/yggdrasil/stdio.rs
index 83f507be617..a64a51abd30 100644
--- a/library/std/src/sys/yggdrasil/stdio.rs
+++ b/library/std/src/sys/yggdrasil/stdio.rs
@@ -1,9 +1,8 @@
 use crate::io;
 use crate::io::{IoSlice, IoSliceMut};
+use yggdrasil_rt::RawFd;
 
 // const FILENO_STDIN: i32 = 0;
-const FILENO_STDOUT: i32 = 1;
-const FILENO_STDERR: i32 = 2;
 
 pub struct Stdin;
 pub struct Stdout;
@@ -47,76 +46,38 @@ impl io::Read for Stdin {
 
 impl io::Write for Stdout {
     fn write(&mut self, data: &[u8]) -> io::Result<usize> {
-        match unsafe { yggdrasil_rt::sys::write(FILENO_STDOUT, data) } {
+        match unsafe { yggdrasil_rt::sys::write(RawFd::STDOUT, data) } {
             Ok(len) => Ok(len),
             Err(_) => Err(io::const_io_error!(
                 io::ErrorKind::Uncategorized,
                 "Stdout is not able to print"
             )),
         }
-        // let len;
-
-        // unsafe { len = abi::write(1, data.as_ptr() as *const u8, data.len()) }
-
-        // if len < 0 {
-        //     Err(io::const_io_error!(
-        //         io::ErrorKind::Uncategorized,
-        //         "Stdout is not able to print"
-        //     ))
-        // } else {
-        //     Ok(len as usize)
-        // }
     }
 
     fn write_vectored(&mut self, _data: &[IoSlice<'_>]) -> io::Result<usize> {
         todo!();
-        // let len;
-
-        // unsafe { len = abi::write(1, data.as_ptr() as *const u8, data.len()) }
-
-        // if len < 0 {
-        //     Err(io::const_io_error!(
-        //         io::ErrorKind::Uncategorized,
-        //         "Stdout is not able to print"
-        //     ))
-        // } else {
-        //     Ok(len as usize)
-        // }
     }
 
     #[inline]
     fn is_write_vectored(&self) -> bool {
         false
-        // true
     }
 
     fn flush(&mut self) -> io::Result<()> {
         Ok(())
-        // Ok(())
     }
 }
 
 impl io::Write for Stderr {
     fn write(&mut self, data: &[u8]) -> io::Result<usize> {
-        match unsafe { yggdrasil_rt::sys::write(FILENO_STDERR, data) } {
+        match unsafe { yggdrasil_rt::sys::write(RawFd::STDERR, data) } {
             Ok(len) => Ok(len),
             Err(_) => Err(io::const_io_error!(
                 io::ErrorKind::Uncategorized,
                 "Stderr is not able to print"
             )),
         }
-        // let len;
-
-        // unsafe { len = abi::write(1, data.as_ptr() as *const u8, data.len()) }
-
-        // if len < 0 {
-        //     Err(io::const_io_error!(
-        //         io::ErrorKind::Uncategorized,
-        //         "Stdout is not able to print"
-        //     ))
-        // } else {
-        //     Ok(len as usize)
-        // }
     }
 
     fn write_vectored(&mut self, _data: &[IoSlice<'_>]) -> io::Result<usize> {