Merge pull request o8vm#12 from viniciusfdasilva/main

[FEATURE] - Removing permission to kill root process and Adding clear to coreutils

src/kernel/syscall.rs

@@ -341,7 +341,12 @@ impl SysCalls {
         #[cfg(all(target_os = "none", feature = "kernel"))]
         {
             let pid = argraw(0);
-            kill(pid)
+
+            if pid == 0 {
+                Err(PermissionDenied)
+            }else{
+                kill(pid)
+            }
         }
     }
     pub fn uptime() -> Result<usize> {

src/user/Cargo.toml

@@ -66,6 +66,10 @@ path = "bin/wc.rs"
 name = "_head"
 path = "bin/head.rs"
 
+[[bin]]
+name = "_clear"
+path = "bin/clear.rs"
+
 [dependencies]
 libkernel = { workspace = true }
 

src/user/bin/clear.rs

@@ -0,0 +1,14 @@
+
+#![no_std]
+
+use ulib::{
+    io::Write,
+    stdio::{stdout}
+};
+
+
+fn main() {
+
+    // clear the screen
+    stdout().write(b"\x1b[2J\x1b[H").unwrap();
+}