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ladybird/Kernel/TTY/MasterPTY.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
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
#include <AK/Badge.h>
Kernel: Move devices into Kernel/Devices/.
2019-04-03 12:36:40 +02:00
#include <Kernel/Devices/CharacterDevice.h>
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
#include <Kernel/DoubleBuffer.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 SlavePTY;
class MasterPTY final : public CharacterDevice {
public:
explicit MasterPTY(unsigned index);
virtual ~MasterPTY() override;
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
String pts_name() const;
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
ssize_t on_slave_write(const byte*, ssize_t);
PTY: Disallow infinite writing to slaves. This way we don't buffer ungodly amounts of output in the kernel when doing e.g "cat /dev/random" on a PTY.
2019-01-25 00:13:54 +01:00
bool can_write_from_slave() const;
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
void notify_slave_closed(Badge<SlavePTY>);
Kernel: Reading from a slave PTY should give EOF if master PTY is closed.
2019-02-05 12:27:32 +01:00
bool is_closed() const { return m_closed; }
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
private:
Kernel: Make /proc/PID/fds display something useful for character devices.
2019-01-21 02:33:01 +01:00
// ^CharacterDevice
Kernel: Rename FileDescriptor to FileDescription. After reading a bunch of POSIX specs, I've learned that a file descriptor is the number that refers to a file description, not the description itself. So this patch renames FileDescriptor to FileDescription, and Process now has FileDescription* file_description(int fd).
2019-06-07 09:36:51 +02:00
virtual ssize_t read(FileDescription&, byte*, ssize_t) override;
virtual ssize_t write(FileDescription&, const byte*, ssize_t) override;
virtual bool can_read(FileDescription&) const override;
virtual bool can_write(FileDescription&) const override;
Kernel: Reading from a slave PTY should give EOF if master PTY is closed.
2019-02-05 12:27:32 +01:00
virtual void close() override;
virtual bool is_master_pty() const override { return true; }
Kernel: Rename FileDescriptor to FileDescription. After reading a bunch of POSIX specs, I've learned that a file descriptor is the number that refers to a file description, not the description itself. So this patch renames FileDescriptor to FileDescription, and Process now has FileDescription* file_description(int fd).
2019-06-07 09:36:51 +02:00
virtual int ioctl(FileDescription&, unsigned request, unsigned arg) 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 "MasterPTY"; }
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
RetainPtr<SlavePTY> m_slave;
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;
Kernel: Reading from a slave PTY should give EOF if master PTY is closed.
2019-02-05 12:27:32 +01:00
bool m_closed { false };
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
DoubleBuffer m_buffer;
Kernel: Have TTY subclasses cache their tty_name/pts_name.
2019-04-16 00:35:02 +02:00
String m_pts_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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