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/*
* Copyright (c) 2015 Advanced Micro Devices, Inc.
* Copyright (c) 2001-2005 The Regents of The University of Michigan
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Nathan Binkert
* Steve Reinhardt
*/
#ifndef __FD_ENTRY_HH__
#define __FD_ENTRY_HH__
#include <ostream>
#include <string>
#include "sim/emul_driver.hh"
/**
* FDEntry is used to manage a single file descriptor mapping and metadata
* for processes.
* Note that the fields are all declared publicly since system calls have a
* habit of only needing to access a single field at a time and accessor
* methods seem like overkill.
*/
class FDEntry : public Serializable
{
public:
/**
* Constructor contains default values
* The file descriptor is free.
*/
FDEntry()
: fd(-1), mode(0), flags(0), isPipe(false), readPipeSource(0),
fileOffset(0), filename(""), driver(NULL)
{ }
void serialize(CheckpointOut &cp) const override;
void unserialize(CheckpointIn &cp) override;
/**
* Check if the target file descriptor is in use.
* @return value denoting if target file descriptor already used
*/
bool isFree();
/**
* Fill in members for this file descriptor entry.
* @param sim_fd host file descriptor
* @param name filename string
* @param flags current flags of the file descriptor
* @param mode current mode of the file descriptor
* @param pipe denotes whether the file descriptor belongs to a pipe
*/
void set(int sim_fd, const std::string name, int flags, int mode,
bool pipe);
/** Reset members to their default values. */
void reset();
int fd;
int mode;
int flags;
bool isPipe;
int readPipeSource;
uint64_t fileOffset;
std::string filename;
EmulatedDriver *driver;
};
#endif // __FD_ENTRY_HH__
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