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serenity/Kernel/TTY/SlavePTY.h

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Add basic PTY support. For now, there are four hard-coded PTYs: /dev/pt{m,s}[0123] Use this in the Terminal to open a pty pair and spawn a shell.
2019-01-15 06:30:19 +01:00
#pragma once
Kernel: Move TTY-related files into Kernel/TTY/.
2019-04-03 12:28:45 +02:00
#include <Kernel/TTY/TTY.h>
Add basic PTY support. For now, there are four hard-coded PTYs: /dev/pt{m,s}[0123] Use this in the Terminal to open a pty pair and spawn a shell.
2019-01-15 06:30:19 +01:00
class MasterPTY;
class SlavePTY final : public TTY {
public:
virtual ~SlavePTY() override;
Kernel: Make syscalls that take a buffer size use ssize_t instead of size_t. Dealing with the unsigned overflow propagation here just seems unreasonably error prone. Let's limit ourselves to 2GB buffer sizes instead.
2019-02-25 21:19:57 +01:00
void on_master_write(const byte*, ssize_t);
Add a PTY multiplexer (/dev/ptmx) device. 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.
2019-01-16 13:36:10 +01:00
unsigned index() const { return m_index; }
Add basic PTY support. For now, there are four hard-coded PTYs: /dev/pt{m,s}[0123] Use this in the Terminal to open a pty pair and spawn a shell.
2019-01-15 06:30:19 +01:00
Add a /dev/pts filesystem and make PTY allocation dynamic. You can now open as many PTY pairs as you like. Well, it's actually capped at 8 for now, but it's just a constant and trivial to change. Unregistering a PTY pair is untested because I didn't want to start mucking with that in Terminal right now.
2019-01-30 00:49:20 +01:00
InodeIdentifier devpts_inode_id() const { return m_devpts_inode_id; }
void set_devpts_inode_id(InodeIdentifier inode_id) { m_devpts_inode_id = inode_id; }
Kernel: Make /proc/PID/fds display something useful for character devices.
2019-01-21 02:33:01 +01:00
private:
// ^TTY
virtual String tty_name() const override;
Kernel: Make syscalls that take a buffer size use ssize_t instead of size_t. Dealing with the unsigned overflow propagation here just seems unreasonably error prone. Let's limit ourselves to 2GB buffer sizes instead.
2019-02-25 21:19:57 +01:00
virtual ssize_t on_tty_write(const byte*, ssize_t) override;
Kernel: Make /proc/PID/fds display something useful for character devices.
2019-01-21 02:33:01 +01:00
// ^CharacterDevice
Kernel: Reading from a slave PTY should give EOF if master PTY is closed.
2019-02-05 12:27:32 +01:00
virtual bool can_read(Process&) const override;
Kernel: Make syscalls that take a buffer size use ssize_t instead of size_t. Dealing with the unsigned overflow propagation here just seems unreasonably error prone. Let's limit ourselves to 2GB buffer sizes instead.
2019-02-25 21:19:57 +01:00
virtual ssize_t read(Process&, byte*, ssize_t) override;
Allow character devices to block write attempts until there is more space.
2019-01-15 09:17:22 +01:00
virtual bool can_write(Process&) const override;
Kernel: Make /proc/PID/fds display something useful for character devices.
2019-01-21 02:33:01 +01:00
virtual const char* class_name() const override { return "SlavePTY"; }
Deallocate PTY's when they close. This required a fair bit of plumbing. The CharacterDevice::close() virtual will now be closed by ~FileDescriptor(), allowing device implementations to do custom cleanup at that point. One big problem remains: if the master PTY is closed before the slave PTY, we go into crashy land.
2019-01-30 18:26:19 +01:00
virtual void close() override;
Add basic PTY support. For now, there are four hard-coded PTYs: /dev/pt{m,s}[0123] Use this in the Terminal to open a pty pair and spawn a shell.
2019-01-15 06:30:19 +01:00
Let each MasterPTY create its slave.
2019-01-16 02:11:50 +01:00
friend class MasterPTY;
SlavePTY(MasterPTY&, unsigned index);
Let the slave PTY keep the master PTY alive. This ownership model is a bit confusing. There's a retain cycle between MasterPTY and SlavePTY, but it's broken when the SlavePTY is closed, meaning that there are no more FileDescriptors referring to it.
2019-01-30 19:05:59 +01:00
RetainPtr<MasterPTY> m_master;
Add basic PTY support. For now, there are four hard-coded PTYs: /dev/pt{m,s}[0123] Use this in the Terminal to open a pty pair and spawn a shell.
2019-01-15 06:30:19 +01:00
unsigned m_index;
Add a /dev/pts filesystem and make PTY allocation dynamic. You can now open as many PTY pairs as you like. Well, it's actually capped at 8 for now, but it's just a constant and trivial to change. Unregistering a PTY pair is untested because I didn't want to start mucking with that in Terminal right now.
2019-01-30 00:49:20 +01:00
InodeIdentifier m_devpts_inode_id;
Kernel: Have TTY subclasses cache their tty_name/pts_name.
2019-04-16 00:35:02 +02:00
String m_tty_name;
Add basic PTY support. For now, there are four hard-coded PTYs: /dev/pt{m,s}[0123] Use this in the Terminal to open a pty pair and spawn a shell.
2019-01-15 06:30:19 +01:00
};
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