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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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11
Kernel/PTYMultiplexer.cpp
View file

@ -2,12 +2,14 @@
#include "MasterPTY.h"
#include <LibC/errno_numbers.h>
static const unsigned s_max_pty_pairs = 8;
PTYMultiplexer::PTYMultiplexer()
: CharacterDevice(5, 2)
{
m_freelist.ensure_capacity(4);
for (int i = 4; i > 0; --i)
m_freelist.unchecked_append(adopt(*new MasterPTY(i - 1)));
m_freelist.ensure_capacity(s_max_pty_pairs);
for (int i = s_max_pty_pairs; i > 0; --i)
m_freelist.unchecked_append(i - 1);
}
PTYMultiplexer::~PTYMultiplexer()
@ -21,7 +23,8 @@ RetainPtr<FileDescriptor> PTYMultiplexer::open(int& error, int options)
error = -EBUSY;
return nullptr;
}
auto master = m_freelist.take_last();
auto master_index = m_freelist.take_last();
auto master = adopt(*new MasterPTY(master_index));
dbgprintf("PTYMultiplexer::open: Vending master %u\n", master->index());
return VFS::the().open(move(master), error, options);
}