Simple filetest passed on qemu/k210.

user/src/lib.rs

@@ -10,6 +10,8 @@ mod syscall;
 mod lang_items;
 
 extern crate alloc;
+#[macro_use]
+extern crate bitflags;
 
 use syscall::*;
 use buddy_system_allocator::LockedHeap;
@@ -42,6 +44,17 @@ fn main() -> i32 {
     panic!("Cannot find main!");
 }
 
+bitflags! {
+    pub struct OpenFlags: u32 {
+        const RDONLY = 0;
+        const WRONLY = 1 << 0;
+        const RDWR = 1 << 1;
+        const CREATE = 1 << 9;
+        const TRUNC = 1 << 10;
+    }
+}
+
+pub fn open(path: &str, flags: OpenFlags) -> isize { sys_open(path, flags.bits) }
 pub fn close(fd: usize) -> isize { sys_close(fd) }
 pub fn pipe(pipe_fd: &mut [usize]) -> isize { sys_pipe(pipe_fd) }
 pub fn read(fd: usize, buf: &mut [u8]) -> isize { sys_read(fd, buf) }