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Add a PTY multiplexer (/dev/ptmx) device.

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When you open /dev/ptmx, you get a file descriptor pointing to one of the
available MasterPTY's. If none are available, you get an EBUSY.

This makes it possible to open multiple (up to 4) Terminals. :^)

To support this, I also added a CharacterDevice::open() that gets control
when VFS is opening a CharacterDevice. This is useful when we want to return
a custom FileDescriptor like we do here.
This commit is contained in:
Andreas Kling 2019-01-16 13:36:10 +01:00
parent b46ae2bf09
commit 9dd29f9aa9
13 changed files with 75 additions and 37 deletions
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12
Kernel/init.cpp
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@ -22,7 +22,7 @@
#include "VirtualConsole.h"
#include "Scheduler.h"
#include "PS2MouseDevice.h"
#include "MasterPTY.h"
#include "PTYMultiplexer.h"
#define SPAWN_GUI_TEST_APP
//#define SPAWN_MULTIPLE_SHELLS
@ -37,10 +37,6 @@ VirtualConsole* tty3;
Keyboard* keyboard;
PS2MouseDevice* ps2mouse;
GUIEventDevice* gui_event_device;
MasterPTY* ptm0;
MasterPTY* ptm1;
MasterPTY* ptm2;
MasterPTY* ptm3;
#ifdef STRESS_TEST_SPAWNING
static void spawn_stress() NORETURN;
@ -80,10 +76,8 @@ static void init_stage2()
auto dev_random = make<RandomDevice>();
vfs->register_character_device(*dev_random);
VFS::the().register_character_device(*new MasterPTY(0));
VFS::the().register_character_device(*new MasterPTY(1));
VFS::the().register_character_device(*new MasterPTY(2));
VFS::the().register_character_device(*new MasterPTY(3));
auto dev_ptmx = make<PTYMultiplexer>();
vfs->register_character_device(*dev_ptmx);
vfs->register_character_device(*keyboard);
vfs->register_character_device(*ps2mouse);