Kernel: Add a method to determine the desired permissions of a Device

This method will be used later in DevFS, to set the appropriate
permissions for each device node.

3 files changed, 9 insertions, 0 deletions

diff --git a/Kernel/TTY/MasterPTY.h b/Kernel/TTY/MasterPTY.h
index 69ba0a16dc..7744a58cdb 100644
--- a/Kernel/TTY/MasterPTY.h
+++ b/Kernel/TTY/MasterPTY.h
@@ -48,6 +48,9 @@ public:
 
     virtual String absolute_path(const FileDescription&) const override;
 
+    // ^Device
+    virtual mode_t required_mode() const override { return 0640; }
+
 private:
     // ^CharacterDevice
     virtual KResultOr<size_t> read(FileDescription&, size_t, UserOrKernelBuffer&, size_t) override;
diff --git a/Kernel/TTY/PTYMultiplexer.h b/Kernel/TTY/PTYMultiplexer.h
index bb20469f38..9402ae1136 100644
--- a/Kernel/TTY/PTYMultiplexer.h
+++ b/Kernel/TTY/PTYMultiplexer.h
@@ -55,6 +55,9 @@ public:
 
     void notify_master_destroyed(Badge<MasterPTY>, unsigned index);
 
+    // ^Device
+    virtual mode_t required_mode() const override { return 0666; }
+
 private:
     // ^CharacterDevice
     virtual const char* class_name() const override { return "PTYMultiplexer"; }
diff --git a/Kernel/TTY/TTY.h b/Kernel/TTY/TTY.h
index 8ba84a0dc6..a60526078c 100644
--- a/Kernel/TTY/TTY.h
+++ b/Kernel/TTY/TTY.h
@@ -67,6 +67,9 @@ public:
     void set_default_termios();
     void hang_up();
 
+    // ^Device
+    virtual mode_t required_mode() const override { return 0620; }
+
 protected:
     virtual ssize_t on_tty_write(const UserOrKernelBuffer&, ssize_t) = 0;
     void set_size(unsigned short columns, unsigned short rows);