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8fbdda5a2d
You can now mmap a file as private and writable, and the changes you make will only be visible to you. This works because internally a MAP_PRIVATE region is backed by a unique PrivateInodeVMObject instead of using the globally shared SharedInodeVMObject like we always did before. :^) Fixes #1045.
106 lines
4.1 KiB
C++
106 lines
4.1 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/NonnullRefPtr.h>
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#include <AK/RefCounted.h>
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#include <AK/String.h>
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#include <AK/Types.h>
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#include <Kernel/Forward.h>
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#include <Kernel/KResult.h>
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#include <Kernel/UnixTypes.h>
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#include <LibBareMetal/Memory/VirtualAddress.h>
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namespace Kernel {
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// File is the base class for anything that can be referenced by a FileDescription.
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//
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// The most important functions in File are:
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//
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// read() and write()
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// - Implement reading and writing.
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// - Return the number of bytes read/written, OR a negative error code.
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//
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// can_read() and can_write()
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//
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// - Used to implement blocking I/O, and the select() and poll() syscalls.
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// - Return true if read() or write() would succeed, respectively.
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// - Note that can_read() should return true in EOF conditions,
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// and a subsequent call to read() should return 0.
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//
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// ioctl()
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//
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// - Optional. If unimplemented, ioctl() on this File will fail with -ENOTTY.
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// - Can be overridden in subclasses to implement arbitrary functionality.
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// - Subclasses should take care to validate incoming addresses before dereferencing.
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//
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// mmap()
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//
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// - Optional. If unimplemented, mmap() on this File will fail with -ENODEV.
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// - Called by mmap() when userspace wants to memory-map this File somewhere.
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// - Should create a Region in the Process and return it if successful.
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class File : public RefCounted<File> {
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public:
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virtual ~File();
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virtual KResultOr<NonnullRefPtr<FileDescription>> open(int options);
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virtual void close();
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virtual bool can_read(const FileDescription&) const = 0;
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virtual bool can_write(const FileDescription&) const = 0;
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virtual ssize_t read(FileDescription&, u8*, ssize_t) = 0;
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virtual ssize_t write(FileDescription&, const u8*, ssize_t) = 0;
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virtual int ioctl(FileDescription&, unsigned request, unsigned arg);
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virtual KResultOr<Region*> mmap(Process&, FileDescription&, VirtualAddress preferred_vaddr, size_t offset, size_t size, int prot, bool shared);
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virtual String absolute_path(const FileDescription&) const = 0;
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virtual KResult truncate(u64) { return KResult(-EINVAL); }
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virtual KResult chown(uid_t, gid_t) { return KResult(-EBADF); }
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virtual KResult chmod(mode_t) { return KResult(-EBADF); }
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virtual const char* class_name() const = 0;
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virtual bool is_seekable() const { return false; }
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virtual bool is_inode() const { return false; }
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virtual bool is_fifo() const { return false; }
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virtual bool is_device() const { return false; }
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virtual bool is_tty() const { return false; }
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virtual bool is_master_pty() const { return false; }
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virtual bool is_block_device() const { return false; }
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virtual bool is_character_device() const { return false; }
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virtual bool is_socket() const { return false; }
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protected:
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File();
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};
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}
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