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/*
** Zabbix
** Copyright (C) 2001-2021 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"
#if defined(HAVE_KSTAT_H) && defined(HAVE_VMINFO_T_UPDATES)
#include "zbxkstat.h"
#include "mutexs.h"
#include "log.h"
#include "stats.h"
extern ZBX_COLLECTOR_DATA *collector;
static kstat_ctl_t *kc = NULL;
static kid_t kc_id = 0;
static kstat_t *kc_vminfo;
static zbx_mutex_t kstat_lock = ZBX_MUTEX_NULL;
/******************************************************************************
* *
* Function: zbx_kstat_refresh *
* *
* Purpose: refreshes kstat environment *
* *
* Parameters: error - [OUT] the error message *
* *
* Return value: SUCCEED - the kstat environment was refreshed successfully *
* FAIL - otherwise *
* *
******************************************************************************/
static int zbx_kstat_refresh(char **error)
{
kid_t kid;
if (-1 == (kid = kstat_chain_update(kc)))
{
*error = zbx_dsprintf(*error, "failed to update kstat chain: %s", zbx_strerror(errno));
return FAIL;
}
if (0 != kid)
kc_id = kid;
if (NULL == (kc_vminfo = kstat_lookup(kc, "unix", -1, "vminfo")))
{
*error = zbx_dsprintf(*error, "failed to find vminfo data: %s", zbx_strerror(errno));
return FAIL;
}
return SUCCEED;
}
/******************************************************************************
* *
* Function: zbx_kstat_init *
* *
* Purpose: initialize kstat environment *
* *
* Parameters: kstat - [IN] the kstat data storage *
* error - [OUT] the error message *
* *
* Return value: SUCCEED - the kstat environment was initialized successfully *
* FAIL - otherwise *
* *
******************************************************************************/
int zbx_kstat_init(zbx_kstat_t *kstat, char **error)
{
char *errmsg = NULL;
int ret = FAIL;
if (NULL == (kc = kstat_open()))
{
*error = zbx_dsprintf(*error, "failed to open kstat: %s", zbx_strerror(errno));
goto out;
}
kc_id = kc->kc_chain_id;
if (SUCCEED != zbx_kstat_refresh(error))
goto out;
if (SUCCEED != (ret = zbx_mutex_create(&kstat_lock, ZBX_MUTEX_KSTAT, &errmsg)))
{
*error = zbx_dsprintf(*error, "failed to create kstat collector mutex : %s", errmsg);
zbx_free(errmsg);
}
memset(kstat, 0, sizeof(zbx_kstat_t));
out:
if (SUCCEED != ret && NULL != kc)
{
kstat_close(kc);
kc = NULL;
}
return ret;
}
void zbx_kstat_destroy(void)
{
if (NULL == kc)
return;
kstat_close(kc);
zbx_mutex_destroy(&kstat_lock);
}
/******************************************************************************
* *
* Function: zbx_kstat_collect *
* *
* Purpose: collect kstat stats *
* *
* Comments: This function is called every second to collect statistics. *
* *
******************************************************************************/
void zbx_kstat_collect(zbx_kstat_t *kstat)
{
kid_t kid;
char *error = NULL;
vminfo_t vminfo;
while (-1 == (kid = kstat_read(kc, kc_vminfo, &vminfo)) || kc_id != kid)
{
if (SUCCEED != zbx_kstat_refresh(&error))
{
zabbix_log(LOG_LEVEL_WARNING, "cannot collect kstat data: %s", error);
zbx_free(error);
return;
}
}
zbx_mutex_lock(kstat_lock);
kstat->vminfo_index ^= 1;
kstat->vminfo[kstat->vminfo_index].freemem = vminfo.freemem;
kstat->vminfo[kstat->vminfo_index].updates = vminfo.updates;
zbx_mutex_unlock(kstat_lock);
}
/******************************************************************************
* *
* Function: zbx_kstat_get_freemem *
* *
* Purpose: get free memory size *
* *
* Parameters: value - [OUT] the free memory size in bytes *
* error - [OUT] the error message *
* *
* Return value: SUCCEED - the free memory size was stored in value *
* FAIL - either an error occurred (error parameter is set) or *
* data was not collected yet (error parameter is left *
* unchanged) *
* *
******************************************************************************/
int zbx_kstat_get_freemem(zbx_uint64_t *value, char **error)
{
int ret = FAIL, last, prev;
zbx_kstat_vminfo_t *vminfo;
zbx_mutex_lock(kstat_lock);
if (NULL == collector)
{
*error = zbx_strdup(*error, "Collector is not started.");
goto out;
}
last = collector->kstat.vminfo_index;
prev = last ^ 1;
vminfo = collector->kstat.vminfo;
if (0 != vminfo[prev].updates && vminfo[prev].updates < vminfo[last].updates)
{
*value = (vminfo[last].freemem - vminfo[prev].freemem) /
(vminfo[last].updates - vminfo[prev].updates) * sysconf(_SC_PAGESIZE);
ret = SUCCEED;
}
out:
zbx_mutex_unlock(kstat_lock);
return ret;
}
#endif /*#if defined(HAVE_KSTAT_H) && defined(HAVE_VMINFO_T_UPDATES)*/
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