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Add a PTY multiplexer (/dev/ptmx) device.

Browse source 
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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7
VirtualFileSystem/VirtualFileSystem.cpp
View file

@ -128,11 +128,12 @@ void VFS::traverse_directory_inode(Inode& dir_inode, Function<bool(const FS::Dir
});
}
RetainPtr<FileDescriptor> VFS::open(CharacterDevice& device, int options)
RetainPtr<FileDescriptor> VFS::open(RetainPtr<CharacterDevice>&& device, int& error, int options)
{
// FIXME: Respect options.
(void) options;
return FileDescriptor::create(device);
(void) error;
return FileDescriptor::create(move(device));
}
RetainPtr<FileDescriptor> VFS::open(const String& path, int& error, int options, InodeIdentifier base)
@ -148,7 +149,7 @@ RetainPtr<FileDescriptor> VFS::open(const String& path, int& error, int options,
kprintf("VFS::open: no such character device %u,%u\n", metadata.majorDevice, metadata.minorDevice);
return nullptr;
}
return FileDescriptor::create((*it).value);
return (*it).value->open(error, options);
}
return FileDescriptor::create(move(inode));
}