alnyan/yggdrasil: implement file seek

library/std/src/sys/yggdrasil/fs/file.rs

@@ -3,11 +3,14 @@ use crate::os::yggdrasil::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd,
 use crate::path::Path;
 use crate::sys::cvt_io;
 use crate::sys::fd::FileDesc;
+use crate::sys::fs::get_metadata_inner;
 use crate::sys_common::{AsInner, AsInnerMut, FromInner, IntoInner};
 
 use super::{FileAttr, FilePermissions, FileTimes};
 
-use yggdrasil_rt::io::{FileMode as OsFileMode, OpenOptions as OsOpenOptions};
+use yggdrasil_rt::io::{
+    FileMode as OsFileMode, OpenOptions as OsOpenOptions, SeekFrom as OsSeekFrom,
+};
 
 #[derive(Debug)]
 pub struct File(FileDesc);
@@ -82,13 +85,13 @@ 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.options, opts.mode))
+            cvt_io(yggdrasil_rt::sys::open(None, path.to_str().unwrap(), opts.options, opts.mode))
                 .map(|fd| File::from_raw_fd(fd))
         }
     }
 
     pub fn file_attr(&self) -> io::Result<FileAttr> {
-        todo!()
+        get_metadata_inner(Some(self.as_raw_fd()), "", true)
     }
 
     pub fn fsync(&self) -> io::Result<()> {
@@ -137,8 +140,8 @@ impl File {
         todo!()
     }
 
-    pub fn seek(&self, _pos: SeekFrom) -> io::Result<u64> {
-        todo!()
+    pub fn seek(&self, pos: SeekFrom) -> io::Result<u64> {
+        unsafe { cvt_io(yggdrasil_rt::sys::seek(self.as_raw_fd(), pos.into())) }
     }
 
     pub fn duplicate(&self) -> io::Result<File> {
@@ -201,3 +204,14 @@ impl FromRawFd for File {
         Self(FromRawFd::from_raw_fd(raw_fd))
     }
 }
+
+#[stable(feature = "yggdrasil_os", since = "1.70.0")]
+impl From<SeekFrom> for OsSeekFrom {
+    fn from(value: SeekFrom) -> OsSeekFrom {
+        match value {
+            SeekFrom::Start(v) => OsSeekFrom::Start(v),
+            SeekFrom::End(v) => OsSeekFrom::End(v),
+            SeekFrom::Current(v) => OsSeekFrom::Current(v),
+        }
+    }
+}