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b16f47ab61
This is the part allowing to dynamically resize the debug log buffer from it's default 64kB size. The buffer is now dynamically allocated. It adds a new API virLogSetBufferSize() which resizes the buffer If passed a zero size, the buffer is deallocated and we do the small optimization of not formatting messages which are not output anymore. On the daemon side, it just adds a new option log_buffer_size to libvirtd.conf and call virLogSetBufferSize() if needed * src/util/logging.h src/util/logging.c src/libvirt_private.syms: make buffer dynamic and add virLogSetBufferSize() internal API * daemon/libvirtd.conf: document the new log_buffer_size option * daemon/libvirtd.c: read and use the new log_buffer_size option
139 lines
5.3 KiB
C
139 lines
5.3 KiB
C
/*
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* logging.h: internal logging and debugging
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*
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* Copyright (C) 2006-2008, 2011 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#ifndef __VIRTLOG_H_
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# define __VIRTLOG_H_
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# include "internal.h"
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# include "buf.h"
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/*
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* If configured with --enable-debug=yes then library calls
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* are printed to stderr for debugging or to an appropriate channel
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* defined at runtime from the libvirt daemon configuration file
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*/
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# ifdef ENABLE_DEBUG
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# define VIR_DEBUG_INT(category, f, l, fmt,...) \
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virLogMessage(category, VIR_LOG_DEBUG, f, l, 0, fmt, __VA_ARGS__)
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# else
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# define VIR_DEBUG_INT(category, f, l, fmt,...) \
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do { } while (0)
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# endif /* !ENABLE_DEBUG */
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# define VIR_INFO_INT(category, f, l, fmt,...) \
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virLogMessage(category, VIR_LOG_INFO, f, l, 0, fmt, __VA_ARGS__)
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# define VIR_WARN_INT(category, f, l, fmt,...) \
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virLogMessage(category, VIR_LOG_WARN, f, l, 0, fmt, __VA_ARGS__)
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# define VIR_ERROR_INT(category, f, l, fmt,...) \
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virLogMessage(category, VIR_LOG_ERROR, f, l, 0, fmt, __VA_ARGS__)
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# define VIR_DEBUG(fmt,...) \
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VIR_DEBUG_INT("file." __FILE__, __func__, __LINE__, fmt, __VA_ARGS__)
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# define VIR_DEBUG0(msg) \
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VIR_DEBUG_INT("file." __FILE__, __func__, __LINE__, "%s", msg)
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# define VIR_INFO(fmt,...) \
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VIR_INFO_INT("file." __FILE__, __func__, __LINE__, fmt, __VA_ARGS__)
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# define VIR_INFO0(msg) \
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VIR_INFO_INT("file." __FILE__, __func__, __LINE__, "%s", msg)
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# define VIR_WARN(fmt,...) \
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VIR_WARN_INT("file." __FILE__, __func__, __LINE__, fmt, __VA_ARGS__)
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# define VIR_WARN0(msg) \
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VIR_WARN_INT("file." __FILE__, __func__, __LINE__, "%s", msg)
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# define VIR_ERROR(fmt,...) \
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VIR_ERROR_INT("file." __FILE__, __func__, __LINE__, fmt, __VA_ARGS__)
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# define VIR_ERROR0(msg) \
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VIR_ERROR_INT("file." __FILE__, __func__, __LINE__, "%s", msg)
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/*
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* To be made public
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*/
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typedef enum {
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VIR_LOG_DEBUG = 1,
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VIR_LOG_INFO,
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VIR_LOG_WARN,
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VIR_LOG_ERROR,
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} virLogPriority;
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# define VIR_LOG_DEFAULT VIR_LOG_WARN
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typedef enum {
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VIR_LOG_TO_STDERR = 1,
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VIR_LOG_TO_SYSLOG,
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VIR_LOG_TO_FILE,
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} virLogDestination;
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/**
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* virLogOutputFunc:
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* @category: the category for the message
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* @priority: the priority for the message
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* @funcname: the function emitting the message
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* @linenr: line where the message was emitted
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* @msg: the message to log, preformatted and zero terminated
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* @len: the lenght of the message in bytes without the terminating zero
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* @data: extra output logging data
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*
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* Callback function used to output messages
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*
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* Returns the number of bytes written or -1 in case of error
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*/
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typedef int (*virLogOutputFunc) (const char *category, int priority,
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const char *funcname, long long lineno,
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const char *str, int len, void *data);
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/**
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* virLogCloseFunc:
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* @data: extra output logging data
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*
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* Callback function used to close a log output
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*/
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typedef void (*virLogCloseFunc) (void *data);
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extern int virLogGetNbFilters(void);
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extern int virLogGetNbOutputs(void);
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extern char *virLogGetFilters(void);
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extern char *virLogGetOutputs(void);
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extern int virLogGetDefaultPriority(void);
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extern int virLogSetDefaultPriority(int priority);
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extern void virLogSetFromEnv(void);
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extern int virLogDefineFilter(const char *match, int priority, int flags);
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extern int virLogDefineOutput(virLogOutputFunc f, virLogCloseFunc c, void *data,
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int priority, int dest, const char *name,
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int flags);
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/*
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* Internal logging API
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*/
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extern void virLogLock(void);
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extern void virLogUnlock(void);
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extern int virLogStartup(void);
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extern int virLogReset(void);
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extern void virLogShutdown(void);
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extern int virLogParseDefaultPriority(const char *priority);
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extern int virLogParseFilters(const char *filters);
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extern int virLogParseOutputs(const char *output);
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extern void virLogMessage(const char *category, int priority,
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const char *funcname, long long linenr, int flags,
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const char *fmt, ...) ATTRIBUTE_FMT_PRINTF(6, 7);
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extern int virLogSetBufferSize(int size);
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extern void virLogEmergencyDumpAll(int signum);
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#endif
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