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// Copyright 2018 Mimecast Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef VFD_H
#define VFD_H
#include "opcodes.h"
#include "defaults.h"
/**
* @brief The virtual file descriptor definition
*
* A virtual file descriptor represents a file descriptor from ioreplay's
* point of view and is being used in various ways to simulate the real I/O
* protocolled to the .capture/.replay files.
*
* Generally speaking I/O replay maps the real FD numbers (the ones logged to
* the .capture file) to virtual FD numbers (a uniqe FD number for every open
* to increase concurrency).
*/
typedef struct vfd_s_ {
int fd; /**< the real fd */
DIR *dirfd; /**< The real dirfd */
long mapped_fd; /**< The mapped fd (virtual fd) */
char *path; /**< The file path belonging to that fd */
bool free_path; /**< True if path has to be freed or not */
unsigned long offset; /**< The current virtual file offset in bytes */
int debug; /**< Used for debugging purposes only */
} vfd_s;
/**
* @brief Creates a new virtual file descriptor object
*
* @param fd The file descriptor
* @param mapped_fd The mapped file descriptor
* @param path The path name
* @return The new fd object
*/
vfd_s* vfd_new(const int fd, const long mapped_fd, char *path);
/**
* @brief Updates the virtfd object
*
* @param vfd The virtfd object
* @param fd The (real) file descriptor
* @param mapped_fd The mapped (virtual) file descriptor
* @param path The path name
* @return The new fd object
*/
void vfd_update(vfd_s *vfd, const int fd, const long mapped_fd, char *path);
/**
* @brief Destroys a file descriptor object
*
* @param vfd The file descriptor object
*/
void vfd_destroy(vfd_s *vfd);
/**
* @brief Prints the virtual file descriptor
* @param vfd The virtual file descriptor
*/
void vfd_print(vfd_s *vfd);
#endif // VFD_H
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