Remove cmdargs and i/o redirection.

os/src/syscall/mod.rs

@@ -27,7 +27,7 @@ pub fn syscall(syscall_id: usize, args: [usize; 3]) -> isize {
         SYSCALL_GET_TIME => sys_get_time(),
         SYSCALL_GETPID => sys_getpid(),
         SYSCALL_FORK => sys_fork(),
-        SYSCALL_EXEC => sys_exec(args[0] as *const u8, args[1] as *const usize),
+        SYSCALL_EXEC => sys_exec(args[0] as *const u8),
         SYSCALL_WAITPID => sys_waitpid(args[0] as isize, args[1] as *mut i32),
         _ => panic!("Unsupported syscall_id: {}", syscall_id),
     }

os/src/syscall/process.rs

@@ -9,15 +9,12 @@ use crate::timer::get_time_ms;
 use crate::mm::{
     translated_str,
     translated_refmut,
-    translated_ref,
 };
 use crate::fs::{
     open_file,
     OpenFlags,
 };
 use alloc::sync::Arc;
-use alloc::vec::Vec;
-use alloc::string::String;
 
 pub fn sys_exit(exit_code: i32) -> ! {
     exit_current_and_run_next(exit_code);
@@ -51,25 +48,14 @@ pub fn sys_fork() -> isize {
     new_pid as isize
 }
 
-pub fn sys_exec(path: *const u8, mut args: *const usize) -> isize {
+pub fn sys_exec(path: *const u8) -> isize {
     let token = current_user_token();
     let path = translated_str(token, path);
-    let mut args_vec: Vec<String> = Vec::new();
-    loop {
-        let arg_str_ptr = *translated_ref(token, args);
-        if arg_str_ptr == 0 {
-            break;
-        }
-        args_vec.push(translated_str(token, arg_str_ptr as *const u8));
-        unsafe { args = args.add(1); }
-    }
     if let Some(app_inode) = open_file(path.as_str(), OpenFlags::RDONLY) {
         let all_data = app_inode.read_all();
         let task = current_task().unwrap();
-        let argc = args_vec.len();
-        task.exec(all_data.as_slice(), args_vec);
-        // return argc because cx.x[10] will be covered with it later
-        argc as isize
+        task.exec(all_data.as_slice());
+        0
     } else {
         -1
     }
@@ -112,4 +98,4 @@ pub fn sys_waitpid(pid: isize, exit_code_ptr: *mut i32) -> isize {
         -2
     }
     // ---- release current PCB automatically
-}
+}