Change io crate & add a small shell

crates/shared/Cargo.toml

@@ -5,7 +5,7 @@ edition = "2024"
 
 [dependencies]
 bffs = { path = "../bffs" }
-io = { path = "../io" }
+io = { package = "no-std-io", path = "../io" }
 
 [features]
 kernel = []

crates/shared/src/fs.rs

@@ -1,4 +1,4 @@
-use io::{IoBase, Read, Write};
+use io::{Read, Write};
 
 use crate::syscall;
 
@@ -19,22 +19,18 @@ impl File {
     }
 }
 
-impl IoBase for File {
-    type Error = ();
-}
-
 impl Read for File {
-    fn read(&mut self, buf: &mut [u8]) -> Result<usize, Self::Error> {
+    fn read(&mut self, buf: &mut [u8]) -> Result<usize, io::Error> {
         Ok(syscall::read(self.as_fd(), buf) as usize)
     }
 }
 
 impl Write for File {
-    fn write(&mut self, buf: &[u8]) -> Result<usize, Self::Error> {
+    fn write(&mut self, buf: &[u8]) -> Result<usize, io::Error> {
         Ok(syscall::write(self.as_fd(), buf) as usize)
     }
 
-    fn flush(&mut self) -> Result<(), Self::Error> {
+    fn flush(&mut self) -> Result<(), io::Error> {
         todo!()
     }
 }

crates/shared/src/syscall.rs

@@ -13,8 +13,7 @@ pub enum SysCall {
     ExecVE = 59,
     Exit = 60,
     NanoSleep = 101,
-    WriteIntTemp = 998,
-    WriteTemp = 999,
+    WaitPid = 247,
     Unimplemented = 1 << 31,
 }
 
@@ -32,8 +31,7 @@ impl From<u64> for SysCall {
             59 => SysCall::ExecVE,
             60 => SysCall::Exit,
             101 => SysCall::NanoSleep,
-            998 => SysCall::WriteIntTemp,
-            999 => SysCall::WriteTemp,
+            247 => SysCall::WaitPid,
             _ => SysCall::Unimplemented,
         }
     }
@@ -110,21 +108,6 @@ pub fn sleep(duration: Duration) {
     }
 }
 
-pub fn write_string_temp(content: &str) {
-    unsafe {
-        syscall!(
-            SysCall::WriteTemp,
-            content.as_ptr() as u64,
-            content.len() as u64
-        );
-    }
-}
-pub fn write_int_temp(content: u64) {
-    unsafe {
-        syscall!(SysCall::WriteIntTemp, content);
-    }
-}
-
 #[allow(unknown_lints)]
 #[allow(fuzzy_provenance_casts)]
 pub fn alloc(layout: Layout) -> *mut u8 {
@@ -177,11 +160,18 @@ pub fn seek(file_descriptor: u64, seek_type: u8, seek: u64) {
         syscall!(SysCall::Seek, file_descriptor, seek_type as u64, seek);
     }
 }
-pub fn spawn(path: &str) {
+pub fn spawn(path: &str, argc: isize, argv: *const *const u8) -> u64 {
     unsafe {
         let ptr = path.as_ptr();
         let size = path.len();
-        syscall!(SysCall::Spawn, ptr as u64, size as u64);
+        let (pid, ..) = syscall!(
+            SysCall::Spawn,
+            ptr as u64,
+            size as u64,
+            argc as u64,
+            argv as u64
+        );
+        pid
     }
 }
 pub fn execve(path: &str) {
@@ -191,3 +181,9 @@ pub fn execve(path: &str) {
         syscall!(SysCall::ExecVE, ptr as u64, size as u64);
     }
 }
+
+pub fn waitpid(pid: usize) {
+    unsafe {
+        syscall!(SysCall::WaitPid, pid as u64);
+    }
+}