lm-sensors/prog/sensord/lib.c

/*
 * sensord
 *
 * A daemon that periodically logs sensor information to syslog.
 *
 * Copyright (c) 1999-2002 Merlin Hughes <merlin@merlin.org>
 *
 * 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include <sys/stat.h>

#include "sensord.h"
#include "lib/error.h"

static int loadConfig(const char *cfgPath, int reload)
{
	struct stat stats;
	FILE *cfg = NULL;
	int ret = 0;

	if (cfgPath && !strcmp(cfgPath, "-")) {
		if (!reload) {
			if ((ret = sensors_init(stdin))) {
				sensorLog(LOG_ERR,
					  "Error loading sensors configuration file <stdin>: %s",
					  sensors_strerror(ret));
				ret = 12;
			}
		}
	} else if (cfgPath && stat(cfgPath, &stats) < 0) {
		sensorLog(LOG_ERR,
			  "Error stating sensors configuration file: %s",
			  cfgPath);
		ret = 10;
	} else {
		if (reload) {
			sensorLog(LOG_INFO, "configuration reloading");
			sensors_cleanup();
		}
		if (cfgPath && !(cfg = fopen(cfgPath, "r"))) {
			sensorLog(LOG_ERR,
				  "Error opening sensors configuration file: %s",
				  cfgPath);
			ret = 11;
		} else if ((ret = sensors_init(cfg))) {
			sensorLog(LOG_ERR,
				  "Error loading sensors configuration file %s: %s",
				  cfgPath ? cfgPath : "(default)",
				  sensors_strerror(ret));
			ret = 11;
		}
		if (cfg)
			fclose(cfg);
	}

	return ret;
}

int loadLib(const char *cfgPath)
{
	int ret;
	ret = loadConfig(cfgPath, 0);
	if (!ret)
		ret = initKnownChips();
	return ret;
}

int reloadLib(const char *cfgPath)
{
	int ret;
	freeKnownChips();
	ret = loadConfig(cfgPath, 1);
	if (!ret)
		ret = initKnownChips();
	return ret;
}

int unloadLib(void)
{
	freeKnownChips();
	sensors_cleanup();
	return 0;
}