Zabbix

/*

** 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

​

#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;

​