Allows specify offset to Uio

Author: ultimaweapon

kernel-1100/src/uio.rs

@@ -16,7 +16,7 @@ pub struct Uio {
 }
 
 impl okf::uio::Uio<Kernel> for Uio {
-    unsafe fn write(td: *mut Thread, iov: *mut IoVec) -> Option<Self> {
+    unsafe fn write(iov: *mut IoVec, td: *mut Thread) -> Option<Self> {
         let res = (*iov).len;
 
         if res > Self::io_max() {
@@ -34,7 +34,7 @@ impl okf::uio::Uio<Kernel> for Uio {
         })
     }
 
-    unsafe fn read(td: *mut Thread, iov: *mut IoVec) -> Option<Self> {
+    unsafe fn read(iov: *mut IoVec, off: usize, td: *mut Thread) -> Option<Self> {
         let res = (*iov).len;
 
         if res > Self::io_max() {
@@ -44,7 +44,7 @@ impl okf::uio::Uio<Kernel> for Uio {
         Some(Self {
             iov,
             len: 1,
-            off: 0,
+            off: off.try_into().unwrap(),
             res: res.try_into().unwrap(),
             seg: UioSeg::Kernel,
             op: UioRw::Read,

src/fd/mod.rs

@@ -75,7 +75,7 @@ pub unsafe fn write<K: Kernel>(
     };
 
     // Write.
-    let mut uio = K::Uio::write(td, &mut vec).unwrap();
+    let mut uio = K::Uio::write(&mut vec, td).unwrap();
     let errno = kern.kern_writev(td, fd, &mut uio);
 
     match NonZero::new(errno) {

src/uio/mod.rs

@@ -7,14 +7,17 @@ pub trait Uio<K: Kernel>: Sized {
     /// # Safety
     /// - `td` cannot be null.
     /// - `iov` cannot be null.
-    unsafe fn write(td: *mut K::Thread, iov: *mut IoVec) -> Option<Self>;
+    unsafe fn write(iov: *mut IoVec, td: *mut K::Thread) -> Option<Self>;
 
     /// Returns [`None`] if [`IoVec::len`] of `iov` is greater than [`Uio::io_max()`].
     ///
     /// # Safety
     /// - `td` cannot be null.
     /// - `iov` cannot be null.
-    unsafe fn read(td: *mut K::Thread, iov: *mut IoVec) -> Option<Self>;
+    ///
+    /// # Panics
+    /// If `off` larger than [`isize::MAX`].
+    unsafe fn read(iov: *mut IoVec, off: usize, td: *mut K::Thread) -> Option<Self>;
 
     /// Returns value of `UIO_MAXIOV`.
     fn vec_max() -> usize {