1 use system_error::SystemError;
2
3 use crate::{
4 filesystem::vfs::{
5 file::{File, FileMode},
6 ROOT_INODE,
7 },
8 process::{Pid, ProcessManager},
9 };
10
11 /// @brief 初始化pid=1的进程的stdio
stdio_init() -> Result<(), SystemError>12 pub fn stdio_init() -> Result<(), SystemError> {
13 if ProcessManager::current_pcb().pid() != Pid(1) {
14 return Err(SystemError::EPERM);
15 }
16 let tty_inode = ROOT_INODE()
17 .lookup("/dev/tty0")
18 .expect("Init stdio: can't find tty0");
19 let stdin =
20 File::new(tty_inode.clone(), FileMode::O_RDONLY).expect("Init stdio: can't create stdin");
21 let stdout =
22 File::new(tty_inode.clone(), FileMode::O_WRONLY).expect("Init stdio: can't create stdout");
23 let stderr = File::new(tty_inode.clone(), FileMode::O_WRONLY | FileMode::O_SYNC)
24 .expect("Init stdio: can't create stderr");
25
26 /*
27 按照规定，进程的文件描述符数组的前三个位置，分别是stdin, stdout, stderr
28 */
29 assert_eq!(
30 ProcessManager::current_pcb()
31 .fd_table()
32 .write()
33 .alloc_fd(stdin, None)
34 .unwrap(),
35 0
36 );
37 assert_eq!(
38 ProcessManager::current_pcb()
39 .fd_table()
40 .write()
41 .alloc_fd(stdout, None)
42 .unwrap(),
43 1
44 );
45 assert_eq!(
46 ProcessManager::current_pcb()
47 .fd_table()
48 .write()
49 .alloc_fd(stderr, None)
50 .unwrap(),
51 2
52 );
53 return Ok(());
54 }
55