Remove cmdargs and i/o redirection.

user/src/lib.rs

@@ -14,7 +14,6 @@ extern crate bitflags;
 
 use syscall::*;
 use buddy_system_allocator::LockedHeap;
-use alloc::vec::Vec;
 
 const USER_HEAP_SIZE: usize = 32768;
 
@@ -30,31 +29,17 @@ pub fn handle_alloc_error(layout: core::alloc::Layout) -> ! {
 
 #[no_mangle]
 #[link_section = ".text.entry"]
-pub extern "C" fn _start(argc: usize, argv: usize) -> ! {
+pub extern "C" fn _start() -> ! {
     unsafe {
         HEAP.lock()
             .init(HEAP_SPACE.as_ptr() as usize, USER_HEAP_SIZE);
     }
-    let mut v: Vec<&'static str> = Vec::new();
-    for i in 0..argc {
-        let str_start = unsafe {
-            ((argv + i * core::mem::size_of::<usize>()) as *const usize).read_volatile()
-        };
-        let len = (0usize..).find(|i| unsafe {
-            ((str_start + *i) as *const u8).read_volatile() == 0
-        }).unwrap();
-        v.push(
-            core::str::from_utf8(unsafe {
-                core::slice::from_raw_parts(str_start as *const u8, len)
-            }).unwrap()
-        );
-    }
-    exit(main(argc, v.as_slice()));
+    exit(main());
 }
 
 #[linkage = "weak"]
 #[no_mangle]
-fn main(_argc: usize, _argv: &[&str]) -> i32 {
+fn main() -> i32 {
     panic!("Cannot find main!");
 }
 
@@ -68,7 +53,6 @@ bitflags! {
     }
 }
 
-pub fn dup(fd: usize) -> isize { sys_dup(fd) }
 pub fn open(path: &str, flags: OpenFlags) -> isize { sys_open(path, flags.bits) }
 pub fn close(fd: usize) -> isize { sys_close(fd) }
 pub fn read(fd: usize, buf: &mut [u8]) -> isize { sys_read(fd, buf) }
@@ -78,7 +62,7 @@ pub fn yield_() -> isize { sys_yield() }
 pub fn get_time() -> isize { sys_get_time() }
 pub fn getpid() -> isize { sys_getpid() }
 pub fn fork() -> isize { sys_fork() }
-pub fn exec(path: &str, args: &[*const u8]) -> isize { sys_exec(path, args) }
+pub fn exec(path: &str) -> isize { sys_exec(path) }
 pub fn wait(exit_code: &mut i32) -> isize {
     loop {
         match sys_waitpid(-1, exit_code as *mut _) {