Function sys_open

kernel/src/syscalls.rs:442–472

(
    context_ptr: *mut Context,
    ptr: *const u8,
    len: usize)

}

fn sys_open(
    context_ptr: *mut Context,
    ptr: *const u8,
    len: usize) {

    let context = unsafe {&mut (*context_ptr)};

    // Check input length
    if len == 0 {
        context.rax = SYSCALL_ERROR_PARAM;
        return;
    }
    // Convert raw pointer to a slice
    let u8_slice = unsafe {slice::from_raw_parts(ptr, len)};

    if let Ok(path_string) = str::from_utf8(u8_slice) {
        match process::open_path(context, &path_string) {
            Ok((handle, match_len)) => {
                context.rax = 0; // No error
                context.rdi = handle; // Return handle
                context.rsi = match_len; // Path match length
            }
            Err(error_code) => {
                context.rax = error_code;
            }
        }
    } else {
        // Bad utf8 conversion
        context.rax = SYSCALL_ERROR_UTF8;
    }
}

/// Allocates a chunk of memory
///