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Add a /dev/pts filesystem and make PTY allocation dynamic.

Browse source 
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.
This commit is contained in:
Andreas Kling 2019-01-30 00:49:20 +01:00
parent c30e2c8d44
commit e9b948103d
12 changed files with 124 additions and 20 deletions
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67
Kernel/DevPtsFS.cpp Normal file
View file

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#include "DevPtsFS.h"
#include <Kernel/VirtualFileSystem.h>
#include <AK/StringBuilder.h>
static DevPtsFS* s_the;
DevPtsFS& DevPtsFS::the()
{
ASSERT(s_the);
return *s_the;
}
RetainPtr<DevPtsFS> DevPtsFS::create()
{
return adopt(*new DevPtsFS);
}
DevPtsFS::DevPtsFS()
{
s_the = this;
}
DevPtsFS::~DevPtsFS()
{
}
bool DevPtsFS::initialize()
{
SynthFS::initialize();
return true;
}
const char* DevPtsFS::class_name() const
{
return "DevPtsFS";
}
RetainPtr<SynthFSInode> DevPtsFS::create_slave_pty_device_file(unsigned index)
{
auto file = adopt(*new SynthFSInode(*this, generate_inode_index()));
StringBuilder builder;
builder.appendf("%u", index);
file->m_name = builder.build();
file->m_metadata.size = 0;
file->m_metadata.uid = 0;
file->m_metadata.gid = 0;
file->m_metadata.mode = 0020666;
file->m_metadata.majorDevice = 11;
file->m_metadata.minorDevice = index;
file->m_metadata.mtime = mepoch;
return file;
}
void DevPtsFS::register_slave_pty(SlavePTY& slave_pty)
{
InterruptDisabler disabler;
auto inode_id = add_file(create_slave_pty_device_file(slave_pty.index()));
slave_pty.set_devpts_inode_id(inode_id);
}
void DevPtsFS::unregister_slave_pty(SlavePTY& slave_pty)
{
InterruptDisabler disabler;
remove_file(slave_pty.devpts_inode_id().index());
}