/*      $NetBSD: log.h,v 1.1.1.2 2009/12/02 00:26:22 haad Exp $ */

/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef _LVM_LOG_H
#define _LVM_LOG_H

#include <errno.h>

/*
* printf()-style macros to use for messages:
*
*   log_error   - always print to stderr.
*   log_print   - always print to stdout.  Use this instead of printf.
*   log_verbose - print to stdout if verbose is set (-v)
*   log_very_verbose - print to stdout if verbose is set twice (-vv)
*   log_debug   - print to stdout if verbose is set three times (-vvv)
*
* In addition, messages will be logged to file or syslog if they
* are more serious than the log level specified with the log/debug_level
* parameter in the configuration file.  These messages get the file
* and line number prepended.  'stack' (without arguments) can be used
* to log this information at debug level.
*
* log_sys_error and log_sys_very_verbose are for errors from system calls
* e.g. log_sys_error("stat", filename);
*      /dev/fd/7: stat failed: No such file or directory
*
*/

#include <stdio.h>              /* FILE */
#include <string.h>             /* strerror() */
#include <errno.h>

#define EUNCLASSIFIED -1        /* Generic error code */

#define _LOG_STDERR 128 /* force things to go to stderr, even if loglevel
                          would make them go to stdout */
#define _LOG_DEBUG 7
#define _LOG_INFO 6
#define _LOG_NOTICE 5
#define _LOG_WARN 4
#define _LOG_ERR 3
#define _LOG_FATAL 2

#define log_debug(x...) LOG_LINE(_LOG_DEBUG, x)
#define log_info(x...) LOG_LINE(_LOG_INFO, x)
#define log_notice(x...) LOG_LINE(_LOG_NOTICE, x)
#define log_warn(x...) LOG_LINE(_LOG_WARN | _LOG_STDERR, x)
#define log_err(x...) LOG_LINE_WITH_ERRNO(_LOG_ERR, EUNCLASSIFIED, x)
#define log_fatal(x...) LOG_LINE_WITH_ERRNO(_LOG_FATAL, EUNCLASSIFIED, x)

#define stack log_debug("<backtrace>")  /* Backtrace on error */
#define log_very_verbose(args...) log_info(args)
#define log_verbose(args...) log_notice(args)
#define log_print(args...) LOG_LINE(_LOG_WARN, args)
#define log_error(args...) log_err(args)
#define log_errno(args...) LOG_LINE_WITH_ERRNO(_LOG_ERR, args)

/* System call equivalents */
#define log_sys_error(x, y) \
               log_err("%s: %s failed: %s", y, x, strerror(errno))
#define log_sys_very_verbose(x, y) \
               log_info("%s: %s failed: %s", y, x, strerror(errno))
#define log_sys_debug(x, y) \
               log_debug("%s: %s failed: %s", y, x, strerror(errno))

#define return_0        do { stack; return 0; } while (0)
#define return_NULL     do { stack; return NULL; } while (0)
#define goto_out        do { stack; goto out; } while (0)
#define goto_bad        do { stack; goto bad; } while (0)

#endif