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/*
** Zabbix
** Copyright (C) 2001-2013 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.
**/
#include "common.h"
#include "ipc.h"
#include "log.h"
/******************************************************************************
* *
* Function: zbx_ftok *
* *
* Purpose: Create IPC id *
* *
* Parameters: path - filename *
* id - user selectable ID *
* *
* Return value: If the function succeeds, then return unique ID *
* -1 on an error *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
key_t zbx_ftok(char *path, int id)
{
key_t ipc_key;
if (-1 == (ipc_key = ftok(path, id)))
{
zbx_error("cannot create IPC key for path [%s] id [%c]: %s",
path, (char)id, zbx_strerror(errno));
}
return ipc_key;
}
/******************************************************************************
* *
* Function: zbx_shmget *
* *
* Purpose: Create block of shared memory *
* *
* Parameters: key - IPC key *
* size - size *
* *
* Return value: If the function succeeds, then return SHM ID *
* -1 on an error *
* *
* Author: Alexei Vladishev *
* *
* Comments: *
* *
******************************************************************************/
int zbx_shmget(key_t key, size_t size)
{
int shm_id, ret = SUCCEED;
if (-1 != (shm_id = shmget(key, size, IPC_CREAT | IPC_EXCL | 0600)))
return shm_id;
/* if shared memory block exists, try to remove and re-create it */
if (EEXIST == errno)
{
/* get ID of existing memory */
if (-1 == (shm_id = shmget(key, 0 /* get reference */, 0600)))
{
zbx_error("cannot attach to existing shared memory: %s", zbx_strerror(errno));
ret = FAIL;
}
zabbix_log(LOG_LEVEL_DEBUG, "zbx_shmget() removing existing shm_id:%d", shm_id);
if (SUCCEED == ret && -1 == shmctl(shm_id, IPC_RMID, 0))
{
zbx_error("cannot remove existing shared memory: %s", zbx_strerror(errno));
ret = FAIL;
}
if (SUCCEED == ret && -1 == (shm_id = shmget(key, size, IPC_CREAT | IPC_EXCL | 0600)))
{
zabbix_log(LOG_LEVEL_CRIT, "cannot allocate shared memory of size " ZBX_FS_SIZE_T ": %s",
(zbx_fs_size_t)size, zbx_strerror(errno));
ret = FAIL;
}
}
else
{
zabbix_log(LOG_LEVEL_CRIT, "cannot allocate shared memory of size " ZBX_FS_SIZE_T ": %s",
(zbx_fs_size_t)size, zbx_strerror(errno));
ret = FAIL;
}
return (ret == SUCCEED) ? shm_id : -1;
}
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