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/*
** Zabbix
** Copyright (C) 2001-2014 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 "sysinfo.h"
#include "log.h"
/******************************************************************************
* *
* Function: get_swapinfo *
* *
* Purpose: get swap usage statistics *
* *
* Return value: SUCCEED if swap usage statistics retrieved successfully *
* FAIL otherwise *
* *
* Comments: we try to imitate "swap -l". *
* *
******************************************************************************/
static int get_swapinfo(zbx_uint64_t *total, zbx_uint64_t *free1, char **error)
{
int i, cnt, cnt2, page_size, ret = FAIL;
struct swaptable *swt = NULL;
struct swapent *ste;
static char path[256];
/* get total number of swap entries */
if (-1 == (cnt = swapctl(SC_GETNSWP, 0)))
{
*error = zbx_dsprintf(NULL, "Cannot obtain number of swap entries: %s", zbx_strerror(errno));
return FAIL;
}
if (0 == cnt)
{
*total = *free1 = 0;
return SUCCEED;
}
/* allocate space to hold count + n swapents */
swt = (struct swaptable *)zbx_malloc(swt, sizeof(struct swaptable) + (cnt - 1) * sizeof(struct swapent));
swt->swt_n = cnt;
/* fill in ste_path pointers: we don't care about the paths, so we point them all to the same buffer */
ste = &(swt->swt_ent[0]);
i = cnt;
while (--i >= 0)
{
ste++->ste_path = path;
}
/* grab all swap info */
if (-1 == (cnt2 = swapctl(SC_LIST, swt)))
{
*error = zbx_dsprintf(NULL, "Cannot obtain a list of swap entries: %s", zbx_strerror(errno));
goto finish;
}
if (cnt != cnt2)
{
*error = zbx_strdup(NULL, "Obtained an unexpected number of swap entries.");
goto finish;
}
/* walk through the structs and sum up the fields */
*total = *free1 = 0;
ste = &(swt->swt_ent[0]);
i = cnt;
while (--i >= 0)
{
/* don't count slots being deleted */
if (0 == (ste->ste_flags & (ST_INDEL | ST_DOINGDEL)))
{
*total += ste->ste_pages;
*free1 += ste->ste_free;
}
ste++;
}
page_size = getpagesize();
/* fill in the results */
*total *= page_size;
*free1 *= page_size;
ret = SUCCEED;
finish:
zbx_free(swt);
return ret;
}
static int SYSTEM_SWAP_TOTAL(AGENT_REQUEST *request, AGENT_RESULT *result)
{
zbx_uint64_t total, free1;
char *error;
if (SUCCEED != get_swapinfo(&total, &free1, &error))
{
SET_MSG_RESULT(result, error);
return SYSINFO_RET_FAIL;
}
SET_UI64_RESULT(result, total);
return SYSINFO_RET_OK;
}
static int SYSTEM_SWAP_USED(AGENT_REQUEST *request, AGENT_RESULT *result)
{
zbx_uint64_t total, free1;
char *error;
if (SUCCEED != get_swapinfo(&total, &free1, &error))
{
SET_MSG_RESULT(result, error);
return SYSINFO_RET_FAIL;
}
SET_UI64_RESULT(result, total - free1);
return SYSINFO_RET_OK;
}
static int SYSTEM_SWAP_FREE(AGENT_REQUEST *request, AGENT_RESULT *result)
{
zbx_uint64_t total, free1;
char *error;
if (SUCCEED != get_swapinfo(&total, &free1, &error))
{
SET_MSG_RESULT(result, error);
return SYSINFO_RET_FAIL;
}
SET_UI64_RESULT(result, free1);
return SYSINFO_RET_OK;
}
static int SYSTEM_SWAP_PUSED(AGENT_REQUEST *request, AGENT_RESULT *result)
{
zbx_uint64_t total, free1;
char *error;
if (SUCCEED != get_swapinfo(&total, &free1, &error))
{
SET_MSG_RESULT(result, error);
return SYSINFO_RET_FAIL;
}
if (0 == total)
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Cannot calculate percentage because total is zero."));
return SYSINFO_RET_FAIL;
}
SET_DBL_RESULT(result, 100.0 * (double)(total - free1) / (double)total);
return SYSINFO_RET_OK;
}
static int SYSTEM_SWAP_PFREE(AGENT_REQUEST *request, AGENT_RESULT *result)
{
zbx_uint64_t total, free1;
char *error;
if (SUCCEED != get_swapinfo(&total, &free1, &error))
{
SET_MSG_RESULT(result, error);
return SYSINFO_RET_FAIL;
}
if (0 == total)
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Cannot calculate percentage because total is zero."));
return SYSINFO_RET_FAIL;
}
SET_DBL_RESULT(result, 100.0 * (double)free1 / (double)total);
return SYSINFO_RET_OK;
}
int SYSTEM_SWAP_SIZE(AGENT_REQUEST *request, AGENT_RESULT *result)
{
char *tmp;
int ret;
if (2 < request->nparam)
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Too many parameters."));
return SYSINFO_RET_FAIL;
}
tmp = get_rparam(request, 0);
if (NULL != tmp && '\0' != *tmp && 0 != strcmp(tmp, "all")) /* default parameter */
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Invalid first parameter."));
return SYSINFO_RET_FAIL;
}
tmp = get_rparam(request, 1);
if (NULL == tmp || '\0' == *tmp || 0 == strcmp(tmp, "free")) /* default parameter */
ret = SYSTEM_SWAP_FREE(request, result);
else if (0 == strcmp(tmp, "total"))
ret = SYSTEM_SWAP_TOTAL(request, result);
else if (0 == strcmp(tmp, "used"))
ret = SYSTEM_SWAP_USED(request, result);
else if (0 == strcmp(tmp, "pfree"))
ret = SYSTEM_SWAP_PFREE(request, result);
else if (0 == strcmp(tmp, "pused"))
ret = SYSTEM_SWAP_PUSED(request, result);
else
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Invalid second parameter."));
return SYSINFO_RET_FAIL;
}
return ret;
}
static int get_swap_io(zbx_uint64_t *swapin, zbx_uint64_t *pgswapin, zbx_uint64_t *swapout,
zbx_uint64_t *pgswapout, char **error)
{
kstat_ctl_t *kc;
kstat_t *k;
cpu_stat_t *cpu;
int cpu_count = 0;
if (NULL == (kc = kstat_open()))
{
*error = zbx_dsprintf(NULL, "Cannot open kernel statistics facility: %s", zbx_strerror(errno));
return SYSINFO_RET_FAIL;
}
for (k = kc->kc_chain; NULL != k; k = k->ks_next)
{
if (0 == strncmp(k->ks_name, "cpu_stat", 8))
{
if (-1 == kstat_read(kc, k, NULL))
{
*error = zbx_dsprintf(NULL, "Cannot read from kernel statistics facility: %s",
zbx_strerror(errno));
goto clean;
}
cpu = (cpu_stat_t *)k->ks_data;
if (NULL != swapin)
{
/* uint_t swapin; */ /* swapins */
*swapin += cpu->cpu_vminfo.swapin;
}
if (NULL != pgswapin)
{
/* uint_t pgswapin; */ /* pages swapped in */
*pgswapin += cpu->cpu_vminfo.pgswapin;
}
if (NULL != swapout)
{
/* uint_t swapout; */ /* swapout */
*swapout += cpu->cpu_vminfo.swapout;
}
if (NULL != pgswapout)
{
/* uint_t pgswapout; */ /* pages swapped out */
*pgswapout += cpu->cpu_vminfo.pgswapout;
}
cpu_count++;
}
}
if (0 == cpu_count)
{
kstat_close(kc);
*error = zbx_strdup(NULL, "Cannot find swap information.");
return SYSINFO_RET_FAIL;
}
clean:
kstat_close(kc);
return SYSINFO_RET_OK;
}
int SYSTEM_SWAP_IN(AGENT_REQUEST *request, AGENT_RESULT *result)
{
int ret;
char *tmp, *error;
zbx_uint64_t value;
if (2 < request->nparam)
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Too many parameters."));
return SYSINFO_RET_FAIL;
}
tmp = get_rparam(request, 0);
if (NULL != tmp && '\0' != *tmp && 0 != strcmp(tmp, "all"))
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Invalid first parameter."));
return SYSINFO_RET_FAIL;
}
tmp = get_rparam(request, 1);
if (NULL == tmp || '\0' == *tmp || 0 == strcmp(tmp, "count"))
ret = get_swap_io(&value, NULL, NULL, NULL, &error);
else if (0 == strcmp(tmp, "pages"))
ret = get_swap_io(NULL, &value, NULL, NULL, &error);
else
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Invalid second parameter."));
return SYSINFO_RET_FAIL;
}
if (SYSINFO_RET_OK == ret)
SET_UI64_RESULT(result, value);
else
SET_MSG_RESULT(result, error);
return SYSINFO_RET_OK;
}
int SYSTEM_SWAP_OUT(AGENT_REQUEST *request, AGENT_RESULT *result)
{
int ret;
char *tmp, *error;
zbx_uint64_t value;
if (2 < request->nparam)
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Too many parameters."));
return SYSINFO_RET_FAIL;
}
tmp = get_rparam(request, 0);
if (NULL != tmp && '\0' != *tmp && 0 != strcmp(tmp, "all"))
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Invalid first parameter."));
return SYSINFO_RET_FAIL;
}
tmp = get_rparam(request, 1);
if (NULL == tmp || '\0' == *tmp || 0 == strcmp(tmp, "count"))
ret = get_swap_io(NULL, NULL, &value, NULL, &error);
else if (0 == strcmp(tmp, "pages"))
ret = get_swap_io(NULL, NULL, NULL, &value, &error);
else
{
SET_MSG_RESULT(result, zbx_strdup(NULL, "Invalid second parameter."));
return SYSINFO_RET_FAIL;
}
if (SYSINFO_RET_OK == ret)
SET_UI64_RESULT(result, value);
else
SET_MSG_RESULT(result, error);
return SYSINFO_RET_OK;
}
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