From 263f78a945d407319140c26bcbff3cec6fbd364f Mon Sep 17 00:00:00 2001 From: Mattias Andrée Date: Thu, 16 Apr 2015 04:50:14 +0200 Subject: work on librarisation MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: Mattias Andrée --- src/bus.h | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 103 insertions(+) create mode 100644 src/bus.h (limited to 'src/bus.h') diff --git a/src/bus.h b/src/bus.h new file mode 100644 index 0000000..faeb2c0 --- /dev/null +++ b/src/bus.h @@ -0,0 +1,103 @@ +/** + * MIT/X Consortium License + * + * Copyright © 2015 Mattias Andrée + * + * 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 + + + +/** + * 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 + -- cgit v1.2.3-70-g09d2