/*
** Copyright (C) 2001-2024 Zabbix SIA
**
** This program is free software: you can redistribute it and/or modify it under the terms of
** the GNU Affero General Public License as published by the Free Software Foundation, version 3.
**
** 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 Affero General Public License for more details.
**
** You should have received a copy of the GNU Affero General Public License along with this program.
** If not, see <https://www.gnu.org/licenses/>.
**/

#include "../sysinfo.h"

static int	read_uint64_from_procfs(const char *path, int first_num, zbx_uint64_t *value)
{
	int	ret = SYSINFO_RET_FAIL;
	char	line[MAX_STRING_LEN];
	FILE	*f;

	if (NULL != (f = fopen(path, "r")))
	{
		if (NULL != fgets(line, sizeof(line), f))
		{
			if (1 == first_num)
			{
				if (1 == sscanf(line, ZBX_FS_UI64 "\t", value))
					ret = SYSINFO_RET_OK;
			}
			else
			{
				if (1 == sscanf(line, ZBX_FS_UI64 "\n", value))
					ret = SYSINFO_RET_OK;
			}
		}
		zbx_fclose(f);
	}

	return ret;
}

int	kernel_maxfiles(AGENT_REQUEST *request, AGENT_RESULT *result)
{
	zbx_uint64_t	value;

	ZBX_UNUSED(request);

	if (SYSINFO_RET_FAIL == read_uint64_from_procfs("/proc/sys/fs/file-max", 0, &value))
	{
		SET_MSG_RESULT(result, zbx_strdup(NULL, "Cannot obtain data from /proc/sys/fs/file-max."));
		return SYSINFO_RET_FAIL;
	}

	SET_UI64_RESULT(result, value);

	return SYSINFO_RET_OK;
}

int	kernel_maxproc(AGENT_REQUEST *request, AGENT_RESULT *result)
{
	zbx_uint64_t	value;

	ZBX_UNUSED(request);

	if (SYSINFO_RET_FAIL == read_uint64_from_procfs("/proc/sys/kernel/pid_max", 0, &value))
	{
		SET_MSG_RESULT(result, zbx_strdup(NULL, "Cannot obtain data from /proc/sys/kernel/pid_max."));
		return SYSINFO_RET_FAIL;
	}

	SET_UI64_RESULT(result, value);

	return SYSINFO_RET_OK;
}

int	kernel_openfiles(AGENT_REQUEST *request, AGENT_RESULT *result)
{
	zbx_uint64_t	value;

	ZBX_UNUSED(request);

	if (SYSINFO_RET_FAIL == read_uint64_from_procfs("/proc/sys/fs/file-nr", 1, &value))
	{
		SET_MSG_RESULT(result, zbx_strdup(NULL, "Cannot obtain data from /proc/sys/fs/file-nr."));
		return SYSINFO_RET_FAIL;
	}

	SET_UI64_RESULT(result, value);

	return SYSINFO_RET_OK;
}