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90 lines
2.2 KiB
C++
90 lines
2.2 KiB
C++
/******************************************************************************
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COPYRIGHT(C) JONAS 'SORTIE' TERMANSEN 2011.
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This file is part of Sortix.
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Sortix is free software: you can redistribute it and/or modify it under the
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terms of the GNU General Public License as published by the Free Software
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Foundation, either version 3 of the License, or (at your option) any later
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version.
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Sortix is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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details.
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You should have received a copy of the GNU General Public License along
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with Sortix. If not, see <http://www.gnu.org/licenses/>.
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device.h
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A base class for all devices.
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******************************************************************************/
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#ifndef SORTIX_DEVICE_H
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#define SORTIX_DEVICE_H
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namespace Sortix
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{
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class User;
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class Device
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{
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public:
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// Flags
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static const nat READABLE = (1<<0);
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static const nat WRITABLE = (1<<1);
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static const nat SEEKABLE = (1<<2);
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static const nat SIZEABLE = (1<<3);
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static const nat BLOCK = (1<<4);
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static const nat FLAGMASK = ((1<<5)-1);
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// Types
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static const nat TYPEMASK = ~FLAGMASK;
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static const nat STREAM = (1<<5);
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static const nat BUFFER = (2<<5);
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static const nat DIRECTORY = (3<<5);
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static const nat FILESYSTEM = (4<<5);
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static const nat NETWORK = (5<<5);
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static const nat SOUND = (6<<5);
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static const nat GRAPHICS = (7<<5);
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static const nat MOUSE = (8<<5);
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static const nat KEYBOARD = (9<<5);
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static const nat PRINTER = (10<<5);
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static const nat SCANNER = (11<<5);
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static const nat VGABUFFER = (12<<5);
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static const nat OTHER = TYPEMASK;
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public:
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volatile size_t _refCount;
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public:
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Device() { _refCount = 1; }
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virtual ~Device() { }
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private:
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User* _owner;
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public:
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bool IsOwner(User* candidate) { return candidate == _owner; }
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public:
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bool Close();
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void RequestThink();
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protected:
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virtual void Think();
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public:
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virtual bool Sync();
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virtual nat Flags() = 0;
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public:
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bool IsType(nat type) { return (Flags() & TYPEMASK) == type; }
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};
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}
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#endif
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