Correct the device major ID for pty slave

kernel/src/device/pty/driver.rs

@@ -80,6 +80,9 @@ impl PtyDriver {
 }
 
 impl TtyDriver for PtyDriver {
+    // Reference: <https://elixir.bootlin.com/linux/v6.17/source/include/uapi/linux/major.h#L147>.
+    const DEVICE_MAJOR_ID: u32 = 136;
+
     fn push_output(&self, chs: &[u8]) -> Result<usize> {
         if self.is_closed() {
             return_errno_with_message!(Errno::EIO, "the pty master has been closed");

kernel/src/device/tty/driver.rs

@@ -13,6 +13,9 @@ use crate::prelude::*;
 ///
 /// [`Tty`]: super::Tty
 pub trait TtyDriver: Send + Sync + 'static {
+    /// The device major ID.
+    const DEVICE_MAJOR_ID: u32;
+
     /// Pushes characters into the output buffer.
     ///
     /// This method returns the number of bytes pushed or fails with an error if no bytes can be

kernel/src/device/tty/mod.rs

@@ -387,6 +387,6 @@ impl<D: TtyDriver> Device for Tty<D> {
     }
 
     fn id(&self) -> DeviceId {
-        DeviceId::new(4, self.index)
+        DeviceId::new(D::DEVICE_MAJOR_ID, self.index)
     }
 }

kernel/src/device/tty/n_tty.rs

@@ -12,6 +12,9 @@ pub struct ConsoleDriver {
 }
 
 impl TtyDriver for ConsoleDriver {
+    // Reference: <https://elixir.bootlin.com/linux/v6.17/source/include/uapi/linux/major.h#L18>.
+    const DEVICE_MAJOR_ID: u32 = 4;
+
     fn push_output(&self, chs: &[u8]) -> Result<usize> {
         self.console.send(chs);
         Ok(chs.len())