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/*
** Zabbix
** Copyright (C) 2001-2022 Zabbix SIA
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**/
#ifndef ZABBIX_IPC_H
#define ZABBIX_IPC_H
#include "zbxtypes.h"
#if defined(_WINDOWS)
# error "This module allowed only for Unix OS"
#endif
#include "mutexs.h"
#define ZBX_NONEXISTENT_SHMID (-1)
int zbx_shm_create(size_t size);
int zbx_shm_destroy(int shmid);
/* data copying callback function prototype */
typedef void (*zbx_shm_copy_func_t)(void *dst, size_t size_dst, const void *src);
/* dynamic shared memory data structure */
typedef struct
{
/* shared memory segment identifier */
int shmid;
/* allocated size */
size_t size;
/* callback function to copy data after shared memory reallocation */
zbx_shm_copy_func_t copy_func;
zbx_mutex_t lock;
}
zbx_dshm_t;
/* local process reference to dynamic shared memory data */
typedef struct
{
/* shared memory segment identifier */
int shmid;
/* shared memory base address */
void *addr;
}
zbx_dshm_ref_t;
int zbx_dshm_create(zbx_dshm_t *shm, size_t shm_size, zbx_mutex_name_t mutex,
zbx_shm_copy_func_t copy_func, char **errmsg);
int zbx_dshm_destroy(zbx_dshm_t *shm, char **errmsg);
int zbx_dshm_realloc(zbx_dshm_t *shm, size_t size, char **errmsg);
int zbx_dshm_validate_ref(const zbx_dshm_t *shm, zbx_dshm_ref_t *shm_ref, char **errmsg);
void zbx_dshm_lock(zbx_dshm_t *shm);
void zbx_dshm_unlock(zbx_dshm_t *shm);
#endif
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