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[console] Add "log message" console usage and an internal syslog() call
Provide an internal syslog() function (unrelated to the syslog console) which can be used to create log messages with specified priorities. The build-time constant LOG_LEVEL can be used to select the minimum required priority for log messages. Any messages that do not have a sufficient priority will be ignored (and will be optimised away at compile-time). The default LOG_LEVEL is LOG_NONE. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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/* | ||
* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>. | ||
* | ||
* 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 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., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
*/ | ||
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FILE_LICENCE ( GPL2_OR_LATER ); | ||
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/** @file | ||
* | ||
* System logger | ||
* | ||
*/ | ||
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#include <stdarg.h> | ||
#include <syslog.h> | ||
#include <ipxe/console.h> | ||
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/** | ||
* Write message to system log | ||
* | ||
* @v fmt Format string | ||
* @v args Arguments | ||
*/ | ||
void log_vprintf ( const char *fmt, va_list args ) { | ||
int saved_usage; | ||
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/* Mark console as in use for log messages */ | ||
saved_usage = console_set_usage ( CONSOLE_USAGE_LOG ); | ||
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/* Print message */ | ||
vprintf ( fmt, args ); | ||
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/* Restore console usage */ | ||
console_set_usage ( saved_usage ); | ||
} | ||
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/** | ||
* Write message to system log | ||
* | ||
* @v fmt Format string | ||
* @v ... Arguments | ||
*/ | ||
void log_printf ( const char *fmt, ... ) { | ||
va_list args; | ||
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va_start ( args, fmt ); | ||
log_vprintf ( fmt, args ); | ||
va_end ( args ); | ||
} |
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#ifndef _SYSLOG_H | ||
#define _SYSLOG_H | ||
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/** @file | ||
* | ||
* System logger | ||
* | ||
*/ | ||
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FILE_LICENCE ( GPL2_OR_LATER ); | ||
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#include <stdarg.h> | ||
#include <config/console.h> | ||
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/** | ||
* @defgroup syslogpri Syslog priorities | ||
* | ||
* These values are chosen to match those used in the syslog network | ||
* protocol (RFC 5424). | ||
* | ||
* @{ | ||
*/ | ||
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/** Emergency: system is unusable */ | ||
#define LOG_EMERG 0 | ||
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/** Alert: action must be taken immediately */ | ||
#define LOG_ALERT 1 | ||
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/** Critical: critical conditions */ | ||
#define LOG_CRIT 2 | ||
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/** Error: error conditions */ | ||
#define LOG_ERR 3 | ||
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/** Warning: warning conditions */ | ||
#define LOG_WARNING 4 | ||
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/** Notice: normal but significant conditions */ | ||
#define LOG_NOTICE 5 | ||
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/** Informational: informational messages */ | ||
#define LOG_INFO 6 | ||
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/** Debug: debug-level messages */ | ||
#define LOG_DEBUG 7 | ||
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/** @} */ | ||
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/** Do not log any messages */ | ||
#define LOG_NONE -1 | ||
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extern void log_vprintf ( const char *fmt, va_list args ); | ||
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extern void __attribute__ (( format ( printf, 1, 2 ) )) | ||
log_printf ( const char *fmt, ... ); | ||
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/** | ||
* Write message to system log | ||
* | ||
* @v priority Message priority | ||
* @v fmt Format string | ||
* @v ... Arguments | ||
*/ | ||
#define vsyslog( priority, fmt, args ) do { \ | ||
if ( (priority) <= LOG_LEVEL ) { \ | ||
log_vprintf ( fmt, (args) ); \ | ||
} \ | ||
} while ( 0 ) | ||
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/** | ||
* Write message to system log | ||
* | ||
* @v priority Message priority | ||
* @v fmt Format string | ||
* @v ... Arguments | ||
*/ | ||
#define syslog( priority, fmt, ... ) do { \ | ||
if ( (priority) <= LOG_LEVEL ) { \ | ||
log_printf ( fmt, ##__VA_ARGS__ ); \ | ||
} \ | ||
} while ( 0 ) | ||
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#endif /* _SYSLOG_H */ |