systemd-stable/logging.h

/*
 * logging.h
 *
 * Simple logging functions that can be compiled away into nothing.
 *
 * Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
 * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.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 version 2 of the License.
 * 
 *	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.,
 *	675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#ifndef LOGGING_H
#define LOGGING_H

#define info(format, arg...)		do { } while (0)
#define dbg(format, arg...)		do { } while (0)
#define dbg_parse(format, arg...)	do { } while (0)
#define logging_init(foo)		do { } while (0)
#define logging_close(foo)		do { } while (0)

#ifdef LOG
#include <stdarg.h>
#include <unistd.h>
#include <syslog.h>

#define LOGNAME_SIZE			42

#undef info
#define info(format, arg...)								\
	do {										\
		log_message(LOG_INFO , format , ## arg);				\
	} while (0)

#ifdef DEBUG
#undef dbg
#define dbg(format, arg...)								\
	do {										\
		log_message(LOG_DEBUG , "%s: " format , __FUNCTION__ , ## arg);	\
	} while (0)
#endif

/* Parser needs it's own debugging statement, we usually don't care about this at all */
#ifdef DEBUG_PARSER
#undef dbg_parse
#define dbg_parse(format, arg...)							\
	do {										\
		log_message(LOG_DEBUG , "%s: " format , __FUNCTION__ , ## arg);	\
	} while (0)
#endif

extern void log_message(int level, const char *format, ...)
	__attribute__ ((format (printf, 2, 3)));

/* each program that uses syslog must declare this variable somewhere */
extern unsigned char logname[LOGNAME_SIZE];

#undef logging_init
static inline void logging_init(char *program_name)
{
	snprintf(logname, LOGNAME_SIZE,"%s[%d]", program_name, getpid());
	openlog(logname, 0, LOG_DAEMON);
}

#undef logging_close
static inline void logging_close(void)
{
	closelog();
}

#endif	/* LOG */

#endif