Zabbix

/*

** Zabbix

** Copyright (C) 2001-2023 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 "log.h"

​

#include "zbxmutexs.h"

#include "zbxthreads.h"

#include "cfg.h"

#include "zbxstr.h"

#include "zbxtime.h"

#ifdef _WINDOWS

#   include "messages.h"

#   include "zbxwinservice.h"

#   include "zbxsysinfo.h"

static HANDLE       system_log_handle = INVALID_HANDLE_VALUE;

#endif

​

#define LOG_COMPONENT_NAME_LEN  64

​

static char         log_filename[MAX_STRING_LEN];

static int          log_type = LOG_TYPE_UNDEFINED;

static zbx_mutex_t      log_access = ZBX_MUTEX_NULL;

​

static int          zbx_log_level = LOG_LEVEL_WARNING;

ZBX_THREAD_LOCAL int        *zbx_plog_level = &zbx_log_level;

​

#define LOG_LEVEL_DEC_FAIL  -2

#define LOG_LEVEL_DEC_SUCCEED   -1

#define LOG_LEVEL_UNCHANGED 0

#define LOG_LEVEL_INC_SUCCEED   1

#define LOG_LEVEL_INC_FAIL  2

​

static ZBX_THREAD_LOCAL int zbx_log_level_change = LOG_LEVEL_UNCHANGED;

​

static ZBX_THREAD_LOCAL char    log_component_name[LOG_COMPONENT_NAME_LEN + 1];

​

static int          config_log_file_size = -1;  /* max log file size in MB */

​

static int  get_config_log_file_size(void)

{

    if (-1 != config_log_file_size)

        return config_log_file_size;

​

    THIS_SHOULD_NEVER_HAPPEN;

    exit(EXIT_FAILURE);

}

​

#ifdef _WINDOWS

#   define LOCK_LOG     zbx_mutex_lock(log_access)

#   define UNLOCK_LOG   zbx_mutex_unlock(log_access)

#else

#   define LOCK_LOG     lock_log()

#   define UNLOCK_LOG   unlock_log()

#endif

​

#ifdef _WINDOWS

#   define STDIN_FILENO _fileno(stdin)

#   define STDOUT_FILENO    _fileno(stdout)

#   define STDERR_FILENO    _fileno(stderr)

​

#   define ZBX_DEV_NULL "NUL"

​

#   define dup2(fd1, fd2)   _dup2(fd1, fd2)

#else

#   define ZBX_DEV_NULL "/dev/null"

#endif

​

#ifndef _WINDOWS

​

static const char   *zabbix_get_log_level_ref_string(int loglevel)

{

    switch (loglevel)

    {

        case LOG_LEVEL_EMPTY:

            return "0 (none)";