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add log rtlm support

#include "global.h"


/*
 * mqtt_rtlm_log() Log message
 *
 * @fmt = format string
 * @... = argument list
 * return: none
 */
static void
mqtt_rtlm_log(const char *fmt, ...)
{
	va_list lst;

	va_start(lst, fmt);
	vsyslog(LOG_ERR, fmt, lst);
	va_end(lst);
}
#define MQTT_RTLM_LOG()	(mqtt_rtlm_log("Error:: System #%d - %s", errno, strerror(errno)))


/*
 * mqtt_rtlm_open() Open log file
 *
 * @cfg = loaded config
 * return: NULL error or SQL handle
 */
FILE *
mqtt_rtlm_open(sl_config *cfg)
{
	FILE *f = NULL;
	const char *str = NULL;

	if (!cfg)
		return NULL;

	str = (const char*) cfg_GetAttribute(cfg, CFG("mqtt_log"), CFG("name"));
	if (!str) {
		mqtt_rtlm_log("Error:: Unknown file name ...\n");
		return NULL;
	}

	if (!(f = fopen(str, "a"))) {
		MQTT_RTLM_LOG();
		return NULL;
	}

	return f;
}

/*
 * mqtt_rtlm_close() Close log file
 *
 * @f = File handle
 * return: none
 */
void
mqtt_rtlm_close(FILE *f)
{
	if (f)
		fclose(f);
}