/*
* Amanda, The Advanced Maryland Automatic Network Disk Archiver
* Copyright (c) 2016-2016 Carbonite, Inc. All Rights Reserved.
* All Rights Reserved.
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of U.M. not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. U.M. makes no representations about the
* suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* U.M. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL U.M.
* BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Authors: the Amanda Development Team. Its members are listed in a
* file named AUTHORS, in the root directory of this distribution.
*/
/*
*
* shared memory ring buffer
*/
#ifndef SHM_RING_H
#define SHM_RING_H
#include <sys/mman.h>
#include <sys/stat.h>
#include <glib.h>
#include <semaphore.h>
#include "conffile.h"
#define SHM_RING_BLOCK_SIZE NETWORK_BLOCK_BYTES
#define SHM_RING_SIZE (SHM_RING_BLOCK_SIZE * 32)
#define SHM_RING_NAME_LENGTH 50
#define SHM_RING_MAX_PID 10
typedef struct shm_ring_control_t {
uint64_t write_offset;
uint64_t written;
gboolean eof_flag;
char padding1[64 - 2*sizeof(uint64_t) - sizeof(gboolean)];
uint64_t read_offset;
uint64_t readx;
char padding2[64 - 2*sizeof(uint64_t)];
gboolean cancelled;
gboolean need_sem_ready;
uint64_t ring_size;
pid_t pids[SHM_RING_MAX_PID];
char sem_write_name[SHM_RING_NAME_LENGTH];
char sem_read_name[SHM_RING_NAME_LENGTH];
char sem_ready_name[SHM_RING_NAME_LENGTH];
char sem_start_name[SHM_RING_NAME_LENGTH];
char shm_data_name[SHM_RING_NAME_LENGTH];
size_t consumer_block_size;
size_t producer_block_size;
uint64_t consumer_ring_size;
uint64_t producer_ring_size;
} shm_ring_control_t;
typedef struct shm_ring_t {
shm_ring_control_t *mc;
int shm_control;
int shm_data;
off_t shm_data_mmap_size;
sem_t *sem_write;
sem_t *sem_read;
sem_t *sem_ready;
sem_t *sem_start;
char *data;
char *data2;
char *shm_control_name;
size_t ring_size; /* shm_ring desired size */
size_t block_size;
size_t data_avail;
} shm_ring_t;
#include "security.h"
#include "stream.h"
extern GMutex *shm_ring_mutex;
int shm_ring_sem_wait(shm_ring_t *shm_ring, sem_t *sem);
shm_ring_t *shm_ring_create(char **errmsg);
shm_ring_t *shm_ring_link(char *name);
void shm_ring_to_security_stream(shm_ring_t *shm_ring, struct security_stream_t *netfd, crc_t *crc);
void shm_ring_consumer_set_size(shm_ring_t *shm_ring, ssize_t ring_size, ssize_t block_size);
void shm_ring_producer_set_size(shm_ring_t *shm_ring, ssize_t ring_size, ssize_t block_size);
void close_producer_shm_ring(shm_ring_t *shm_ring);
void close_consumer_shm_ring(shm_ring_t *shm_ring);
void clean_shm_ring(void);
void cleanup_shm_ring(void);
void fd_to_shm_ring(int fd, shm_ring_t *shm_ring, crc_t *crc);
void shm_ring_to_fd(shm_ring_t *shm_ring, int fd, crc_t *crc);
#endif