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/**
* MIT/X Consortium License
*
* Copyright © 2015 Mattias Andrée <maandree@member.fsf.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#ifndef BUS_H
#define BUS_H
#include <sys/types.h>
/**
* Open the bus for reading only
*/
#define BUS_RDONLY 1
/**
* Open the bus for writing only
*/
#define BUS_WRONLY 0
/**
* Open the bus for both reading and writing only
*/
#define BUS_RDWR 0
/**
* Fail to create bus if its file already exists
*/
#define BUS_EXCL 2
/**
* The number of bytes in storeable in the shared memory,
* note that this includes the NUL-termination.
* This means that message can be at most one byte smaller.
*/
#define BUS_MEMORY_SIZE 2048
/**
* Bus information
*/
typedef struct bus
{
/**
* The key for the semaphore array
*/
key_t key_sem;
/**
* The key for the
*/
key_t key_shm;
/**
* The ID of the semaphore array
*/
int sem_id;
/**
* The address of the shared memory
*/
char *message;
} bus_t;
const char *bus_create(const char *file, int flags);
int bus_unlink(const char *file);
int bus_open(bus_t *bus, const char *file, int flags);
int bus_close(bus_t *bus);
int bus_write(const bus_t *bus, const char *message);
int bus_read(const bus_t *bus, int (*callback)(const char *message, void *user_data), void *user_data);
#endif
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