os/syscall/
fs.rs

1//! File and filesystem-related syscalls
2
3const FD_STDOUT: usize = 1;
4
5/// write buf of length `len`  to a file with `fd`
6pub fn sys_write(fd: usize, buf: *const u8, len: usize) -> isize {
7    match fd {
8        FD_STDOUT => {
9            let slice = unsafe { core::slice::from_raw_parts(buf, len) };
10            let str = core::str::from_utf8(slice).unwrap();
11            print!("{}", str);
12            len as isize
13        }
14        _ => {
15            panic!("Unsupported fd in sys_write!");
16        }
17    }
18}
os/syscall/fs.rs

os/syscall/
fs.rs
