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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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5
VirtualFileSystem/CharacterDevice.cpp
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@@ -3,12 +3,11 @@
CharacterDevice::~CharacterDevice()
{
ASSERT_NOT_REACHED();
}
RetainPtr<FileDescriptor> CharacterDevice::open(int options)
RetainPtr<FileDescriptor> CharacterDevice::open(int& error, int options)
{
return VFS::the().open(*this, options);
return VFS::the().open(*this, error, options);
}
int CharacterDevice::ioctl(Process&, unsigned, unsigned)