915 lines
28 KiB
C
915 lines
28 KiB
C
/*
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* Copyright (C) 2004-2007, 2009 Internet Systems Consortium, Inc. ("ISC")
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* Copyright (C) 1999-2002 Internet Software Consortium.
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
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* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
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* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
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* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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/* $Id: log.h,v 1.59 2009/02/16 02:01:16 marka Exp $ */
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#ifndef ISC_LOG_H
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#define ISC_LOG_H 1
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/*! \file isc/log.h */
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#include <stdio.h>
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#include <stdarg.h>
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#include <syslog.h> /* XXXDCL NT */
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#include <isc/formatcheck.h>
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#include <isc/lang.h>
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#include <isc/platform.h>
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#include <isc/types.h>
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/*@{*/
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/*!
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* \brief Severity levels, patterned after Unix's syslog levels.
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*
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*/
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#define ISC_LOG_DEBUG(level) (level)
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/*!
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* #ISC_LOG_DYNAMIC can only be used for defining channels with
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* isc_log_createchannel(), not to specify a level in isc_log_write().
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*/
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#define ISC_LOG_DYNAMIC 0
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#define ISC_LOG_INFO (-1)
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#define ISC_LOG_NOTICE (-2)
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#define ISC_LOG_WARNING (-3)
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#define ISC_LOG_ERROR (-4)
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#define ISC_LOG_CRITICAL (-5)
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/*@}*/
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/*@{*/
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/*!
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* \brief Destinations.
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*/
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#define ISC_LOG_TONULL 1
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#define ISC_LOG_TOSYSLOG 2
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#define ISC_LOG_TOFILE 3
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#define ISC_LOG_TOFILEDESC 4
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/*@}*/
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/*@{*/
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/*%
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* Channel flags.
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*/
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#define ISC_LOG_PRINTTIME 0x0001
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#define ISC_LOG_PRINTLEVEL 0x0002
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#define ISC_LOG_PRINTCATEGORY 0x0004
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#define ISC_LOG_PRINTMODULE 0x0008
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#define ISC_LOG_PRINTTAG 0x0010
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#define ISC_LOG_PRINTALL 0x001F
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#define ISC_LOG_DEBUGONLY 0x1000
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#define ISC_LOG_OPENERR 0x8000 /* internal */
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/*@}*/
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/*@{*/
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/*!
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* \brief Other options.
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*
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* XXXDCL INFINITE doesn't yet work. Arguably it isn't needed, but
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* since I am intend to make large number of versions work efficiently,
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* INFINITE is going to be trivial to add to that.
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*/
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#define ISC_LOG_ROLLINFINITE (-1)
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#define ISC_LOG_ROLLNEVER (-2)
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/*@}*/
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/*!
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* \brief Used to name the categories used by a library.
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*
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* An array of isc_logcategory
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* structures names each category, and the id value is initialized by calling
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* isc_log_registercategories.
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*/
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struct isc_logcategory {
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const char *name;
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unsigned int id;
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};
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/*%
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* Similar to isc_logcategory, but for all the modules a library defines.
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*/
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struct isc_logmodule {
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const char *name;
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unsigned int id;
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};
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/*%
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* The isc_logfile structure is initialized as part of an isc_logdestination
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* before calling isc_log_createchannel().
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*
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* When defining an #ISC_LOG_TOFILE
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* channel the name, versions and maximum_size should be set before calling
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* isc_log_createchannel(). To define an #ISC_LOG_TOFILEDESC channel set only
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* the stream before the call.
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*
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* Setting maximum_size to zero implies no maximum.
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*/
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typedef struct isc_logfile {
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FILE *stream; /*%< Initialized to NULL for #ISC_LOG_TOFILE. */
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const char *name; /*%< NULL for #ISC_LOG_TOFILEDESC. */
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int versions; /* >= 0, #ISC_LOG_ROLLNEVER, #ISC_LOG_ROLLINFINITE. */
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/*%
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* stdio's ftell is standardized to return a long, which may well not
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* be big enough for the largest file supportable by the operating
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* system (though it is _probably_ big enough for the largest log
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* anyone would want). st_size returned by fstat should be typedef'd
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* to a size large enough for the largest possible file on a system.
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*/
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isc_offset_t maximum_size;
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isc_boolean_t maximum_reached; /*%< Private. */
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} isc_logfile_t;
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/*%
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* Passed to isc_log_createchannel to define the attributes of either
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* a stdio or a syslog log.
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*/
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typedef union isc_logdestination {
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isc_logfile_t file;
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int facility; /* XXXDCL NT */
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} isc_logdestination_t;
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/*@{*/
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/*%
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* The built-in categories of libisc.
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*
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* Each library registering categories should provide library_LOGCATEGORY_name
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* definitions with indexes into its isc_logcategory structure corresponding to
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* the order of the names.
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*/
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LIBISC_EXTERNAL_DATA extern isc_logcategory_t isc_categories[];
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LIBISC_EXTERNAL_DATA extern isc_log_t *isc_lctx;
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LIBISC_EXTERNAL_DATA extern isc_logmodule_t isc_modules[];
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/*@}*/
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/*@{*/
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/*%
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* Do not log directly to DEFAULT. Use another category. When in doubt,
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* use GENERAL.
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*/
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#define ISC_LOGCATEGORY_DEFAULT (&isc_categories[0])
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#define ISC_LOGCATEGORY_GENERAL (&isc_categories[1])
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/*@}*/
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#define ISC_LOGMODULE_SOCKET (&isc_modules[0])
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#define ISC_LOGMODULE_TIME (&isc_modules[1])
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#define ISC_LOGMODULE_INTERFACE (&isc_modules[2])
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#define ISC_LOGMODULE_TIMER (&isc_modules[3])
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#define ISC_LOGMODULE_FILE (&isc_modules[4])
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ISC_LANG_BEGINDECLS
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isc_result_t
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isc_log_create(isc_mem_t *mctx, isc_log_t **lctxp, isc_logconfig_t **lcfgp);
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/*%<
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* Establish a new logging context, with default channels.
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*
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* Notes:
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*\li isc_log_create() calls isc_logconfig_create(), so see its comment
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* below for more information.
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*
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* Requires:
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*\li mctx is a valid memory context.
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*\li lctxp is not null and *lctxp is null.
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*\li lcfgp is null or lcfgp is not null and *lcfgp is null.
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*
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* Ensures:
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*\li *lctxp will point to a valid logging context if all of the necessary
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* memory was allocated, or NULL otherwise.
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*\li *lcfgp will point to a valid logging configuration if all of the
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* necessary memory was allocated, or NULL otherwise.
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*\li On failure, no additional memory is allocated.
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*
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* Returns:
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*\li #ISC_R_SUCCESS Success
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*\li #ISC_R_NOMEMORY Resource limit: Out of memory
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*/
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isc_result_t
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isc_logconfig_create(isc_log_t *lctx, isc_logconfig_t **lcfgp);
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/*%<
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* Create the data structure that holds all of the configurable information
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* about where messages are actually supposed to be sent -- the information
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* that could changed based on some configuration file, as opposed to the
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* the category/module specification of isc_log_[v]write[1] that is compiled
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* into a program, or the debug_level which is dynamic state information.
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*
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* Notes:
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*\li It is necessary to specify the logging context the configuration
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* will be used with because the number of categories and modules
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* needs to be known in order to set the configuration. However,
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* the configuration is not used by the logging context until the
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* isc_logconfig_use function is called.
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*
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*\li The memory context used for operations that allocate memory for
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* the configuration is that of the logging context, as specified
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* in the isc_log_create call.
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*
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*\li Four default channels are established:
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*\verbatim
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* default_syslog
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* - log to syslog's daemon facility #ISC_LOG_INFO or higher
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* default_stderr
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* - log to stderr #ISC_LOG_INFO or higher
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* default_debug
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* - log to stderr #ISC_LOG_DEBUG dynamically
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* null
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* - log nothing
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*\endverbatim
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*
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* Requires:
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*\li lctx is a valid logging context.
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*\li lcftp is not null and *lcfgp is null.
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*
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* Ensures:
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*\li *lcfgp will point to a valid logging context if all of the necessary
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* memory was allocated, or NULL otherwise.
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*\li On failure, no additional memory is allocated.
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*
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* Returns:
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*\li #ISC_R_SUCCESS Success
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*\li #ISC_R_NOMEMORY Resource limit: Out of memory
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*/
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isc_logconfig_t *
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isc_logconfig_get(isc_log_t *lctx);
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/*%<
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* Returns a pointer to the configuration currently in use by the log context.
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*
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* Requires:
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*\li lctx is a valid context.
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*
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* Ensures:
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*\li The configuration pointer is non-null.
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*
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* Returns:
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*\li The configuration pointer.
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*/
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isc_result_t
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isc_logconfig_use(isc_log_t *lctx, isc_logconfig_t *lcfg);
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/*%<
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* Associate a new configuration with a logging context.
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*
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* Notes:
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*\li This is thread safe. The logging context will lock a mutex
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* before attempting to swap in the new configuration, and isc_log_doit
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* (the internal function used by all of isc_log_[v]write[1]) locks
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* the same lock for the duration of its use of the configuration.
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*
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* Requires:
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*\li lctx is a valid logging context.
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*\li lcfg is a valid logging configuration.
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*\li lctx is the same configuration given to isc_logconfig_create
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* when the configuration was created.
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*
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* Ensures:
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*\li Future calls to isc_log_write will use the new configuration.
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*
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* Returns:
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*\li #ISC_R_SUCCESS Success
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*\li #ISC_R_NOMEMORY Resource limit: Out of memory
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*/
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void
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isc_log_destroy(isc_log_t **lctxp);
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/*%<
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* Deallocate the memory associated with a logging context.
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*
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* Requires:
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*\li *lctx is a valid logging context.
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*
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* Ensures:
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*\li All of the memory associated with the logging context is returned
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* to the free memory pool.
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*
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*\li Any open files are closed.
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*
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*\li The logging context is marked as invalid.
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*/
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void
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isc_logconfig_destroy(isc_logconfig_t **lcfgp);
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/*%<
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* Destroy a logging configuration.
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*
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* Notes:
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*\li This function cannot be used directly with the return value of
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* isc_logconfig_get, because a logging context must always have
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* a valid configuration associated with it.
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*
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* Requires:
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*\li lcfgp is not null and *lcfgp is a valid logging configuration.
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*\li The logging configuration is not in use by an existing logging context.
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*
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* Ensures:
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*\li All memory allocated for the configuration is freed.
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*
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*\li The configuration is marked as invalid.
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*/
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void
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isc_log_registercategories(isc_log_t *lctx, isc_logcategory_t categories[]);
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/*%<
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* Identify logging categories a library will use.
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*
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* Notes:
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*\li A category should only be registered once, but no mechanism enforces
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* this rule.
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*
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*\li The end of the categories array is identified by a NULL name.
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*
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*\li Because the name is used by #ISC_LOG_PRINTCATEGORY, it should not
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* be altered or destroyed after isc_log_registercategories().
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*
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*\li Because each element of the categories array is used by
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* isc_log_categorybyname, it should not be altered or destroyed
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* after registration.
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*
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*\li The value of the id integer in each structure is overwritten
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* by this function, and so id need not be initialized to any particular
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* value prior to the function call.
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*
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*\li A subsequent call to isc_log_registercategories with the same
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* logging context (but new categories) will cause the last
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* element of the categories array from the prior call to have
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* its "name" member changed from NULL to point to the new
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* categories array, and its "id" member set to UINT_MAX.
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*
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* Requires:
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*\li lctx is a valid logging context.
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*\li categories != NULL.
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*\li categories[0].name != NULL.
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*
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* Ensures:
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* \li There are references to each category in the logging context,
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* so they can be used with isc_log_usechannel() and isc_log_write().
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*/
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void
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isc_log_registermodules(isc_log_t *lctx, isc_logmodule_t modules[]);
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/*%<
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* Identify logging categories a library will use.
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*
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* Notes:
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*\li A module should only be registered once, but no mechanism enforces
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* this rule.
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*
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*\li The end of the modules array is identified by a NULL name.
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*
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*\li Because the name is used by #ISC_LOG_PRINTMODULE, it should not
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* be altered or destroyed after isc_log_registermodules().
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*
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*\li Because each element of the modules array is used by
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* isc_log_modulebyname, it should not be altered or destroyed
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* after registration.
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*
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*\li The value of the id integer in each structure is overwritten
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* by this function, and so id need not be initialized to any particular
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* value prior to the function call.
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*
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*\li A subsequent call to isc_log_registermodules with the same
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* logging context (but new modules) will cause the last
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* element of the modules array from the prior call to have
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* its "name" member changed from NULL to point to the new
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* modules array, and its "id" member set to UINT_MAX.
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*
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* Requires:
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*\li lctx is a valid logging context.
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*\li modules != NULL.
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*\li modules[0].name != NULL;
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*
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* Ensures:
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*\li Each module has a reference in the logging context, so they can be
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* used with isc_log_usechannel() and isc_log_write().
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*/
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isc_result_t
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isc_log_createchannel(isc_logconfig_t *lcfg, const char *name,
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unsigned int type, int level,
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const isc_logdestination_t *destination,
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unsigned int flags);
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/*%<
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* Specify the parameters of a logging channel.
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*
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* Notes:
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*\li The name argument is copied to memory in the logging context, so
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* it can be altered or destroyed after isc_log_createchannel().
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*
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*\li Defining a very large number of channels will have a performance
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* impact on isc_log_usechannel(), since the names are searched
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* linearly until a match is made. This same issue does not affect
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* isc_log_write, however.
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*
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*\li Channel names can be redefined; this is primarily useful for programs
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* that want their own definition of default_syslog, default_debug
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* and default_stderr.
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*
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*\li Any channel that is redefined will not affect logging that was
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* already directed to its original definition, _except_ for the
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* default_stderr channel. This case is handled specially so that
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* the default logging category can be changed by redefining
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* default_stderr. (XXXDCL Though now that I think of it, the default
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* logging category can be changed with only one additional function
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* call by defining a new channel and then calling isc_log_usechannel()
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* for #ISC_LOGCATEGORY_DEFAULT.)
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*
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*\li Specifying #ISC_LOG_PRINTTIME or #ISC_LOG_PRINTTAG for syslog is allowed,
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* but probably not what you wanted to do.
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*
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* #ISC_LOG_DEBUGONLY will mark the channel as usable only when the
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* debug level of the logging context (see isc_log_setdebuglevel)
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* is non-zero.
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*
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* Requires:
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*\li lcfg is a valid logging configuration.
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*
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*\li name is not NULL.
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*
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*\li type is #ISC_LOG_TOSYSLOG, #ISC_LOG_TOFILE, #ISC_LOG_TOFILEDESC or
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* #ISC_LOG_TONULL.
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*
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*\li destination is not NULL unless type is #ISC_LOG_TONULL.
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*
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*\li level is >= #ISC_LOG_CRITICAL (the most negative logging level).
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*
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*\li flags does not include any bits aside from the ISC_LOG_PRINT* bits
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* or #ISC_LOG_DEBUGONLY.
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*
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* Ensures:
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*\li #ISC_R_SUCCESS
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* A channel with the given name is usable with
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* isc_log_usechannel().
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*
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*\li #ISC_R_NOMEMORY or #ISC_R_UNEXPECTED
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* No additional memory is being used by the logging context.
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* Any channel that previously existed with the given name
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* is not redefined.
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*
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* Returns:
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*\li #ISC_R_SUCCESS Success
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*\li #ISC_R_NOMEMORY Resource limit: Out of memory
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*\li #ISC_R_UNEXPECTED type was out of range and REQUIRE()
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* was disabled.
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*/
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isc_result_t
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isc_log_usechannel(isc_logconfig_t *lcfg, const char *name,
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const isc_logcategory_t *category,
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const isc_logmodule_t *module);
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/*%<
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* Associate a named logging channel with a category and module that
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* will use it.
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*
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* Notes:
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*\li The name is searched for linearly in the set of known channel names
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* until a match is found. (Note the performance impact of a very large
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* number of named channels.) When multiple channels of the same
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* name are defined, the most recent definition is found.
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*
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*\li Specifying a very large number of channels for a category will have
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* a moderate impact on performance in isc_log_write(), as each
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* call looks up the category for the start of a linked list, which
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* it follows all the way to the end to find matching modules. The
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* test for matching modules is integral, though.
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*
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*\li If category is NULL, then the channel is associated with the indicated
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* module for all known categories (including the "default" category).
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*
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*\li If module is NULL, then the channel is associated with every module
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* that uses that category.
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*
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*\li Passing both category and module as NULL would make every log message
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* use the indicated channel.
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*
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* \li Specifying a channel that is #ISC_LOG_TONULL for a category/module pair
|
|
* has no effect on any other channels associated with that pair,
|
|
* regardless of ordering. Thus you cannot use it to "mask out" one
|
|
* category/module pair when you have specified some other channel that
|
|
* is also used by that category/module pair.
|
|
*
|
|
* Requires:
|
|
*\li lcfg is a valid logging configuration.
|
|
*
|
|
*\li category is NULL or has an id that is in the range of known ids.
|
|
*
|
|
* module is NULL or has an id that is in the range of known ids.
|
|
*
|
|
* Ensures:
|
|
*\li #ISC_R_SUCCESS
|
|
* The channel will be used by the indicated category/module
|
|
* arguments.
|
|
*
|
|
*\li #ISC_R_NOMEMORY
|
|
* If assignment for a specific category has been requested,
|
|
* the channel has not been associated with the indicated
|
|
* category/module arguments and no additional memory is
|
|
* used by the logging context.
|
|
* If assignment for all categories has been requested
|
|
* then _some_ may have succeeded (starting with category
|
|
* "default" and progressing through the order of categories
|
|
* passed to isc_log_registercategories()) and additional memory
|
|
* is being used by whatever assignments succeeded.
|
|
*
|
|
* Returns:
|
|
*\li #ISC_R_SUCCESS Success
|
|
*\li #ISC_R_NOMEMORY Resource limit: Out of memory
|
|
*/
|
|
|
|
/* Attention: next four comments PRECEED code */
|
|
/*!
|
|
* \brief
|
|
* Write a message to the log channels.
|
|
*
|
|
* Notes:
|
|
*\li Log messages containing natural language text should be logged with
|
|
* isc_log_iwrite() to allow for localization.
|
|
*
|
|
*\li lctx can be NULL; this is allowed so that programs which use
|
|
* libraries that use the ISC logging system are not required to
|
|
* also use it.
|
|
*
|
|
*\li The format argument is a printf(3) string, with additional arguments
|
|
* as necessary.
|
|
*
|
|
* Requires:
|
|
*\li lctx is a valid logging context.
|
|
*
|
|
*\li The category and module arguments must have ids that are in the
|
|
* range of known ids, as established by isc_log_registercategories()
|
|
* and isc_log_registermodules().
|
|
*
|
|
*\li level != #ISC_LOG_DYNAMIC. ISC_LOG_DYNAMIC is used only to define
|
|
* channels, and explicit debugging level must be identified for
|
|
* isc_log_write() via ISC_LOG_DEBUG(level).
|
|
*
|
|
*\li format != NULL.
|
|
*
|
|
* Ensures:
|
|
*\li The log message is written to every channel associated with the
|
|
* indicated category/module pair.
|
|
*
|
|
* Returns:
|
|
*\li Nothing. Failure to log a message is not construed as a
|
|
* meaningful error.
|
|
*/
|
|
void
|
|
isc_log_write(isc_log_t *lctx, isc_logcategory_t *category,
|
|
isc_logmodule_t *module, int level,
|
|
const char *format, ...)
|
|
|
|
ISC_FORMAT_PRINTF(5, 6);
|
|
|
|
/*%
|
|
* Write a message to the log channels.
|
|
*
|
|
* Notes:
|
|
*\li lctx can be NULL; this is allowed so that programs which use
|
|
* libraries that use the ISC logging system are not required to
|
|
* also use it.
|
|
*
|
|
*\li The format argument is a printf(3) string, with additional arguments
|
|
* as necessary.
|
|
*
|
|
* Requires:
|
|
*\li lctx is a valid logging context.
|
|
*
|
|
*\li The category and module arguments must have ids that are in the
|
|
* range of known ids, as established by isc_log_registercategories()
|
|
* and isc_log_registermodules().
|
|
*
|
|
*\li level != #ISC_LOG_DYNAMIC. ISC_LOG_DYNAMIC is used only to define
|
|
* channels, and explicit debugging level must be identified for
|
|
* isc_log_write() via ISC_LOG_DEBUG(level).
|
|
*
|
|
*\li format != NULL.
|
|
*
|
|
* Ensures:
|
|
*\li The log message is written to every channel associated with the
|
|
* indicated category/module pair.
|
|
*
|
|
* Returns:
|
|
*\li Nothing. Failure to log a message is not construed as a
|
|
* meaningful error.
|
|
*/
|
|
void
|
|
isc_log_vwrite(isc_log_t *lctx, isc_logcategory_t *category,
|
|
isc_logmodule_t *module, int level,
|
|
const char *format, va_list args)
|
|
|
|
ISC_FORMAT_PRINTF(5, 0);
|
|
|
|
/*%
|
|
* Write a message to the log channels, pruning duplicates that occur within
|
|
* a configurable amount of seconds (see isc_log_[sg]etduplicateinterval).
|
|
* This function is otherwise identical to isc_log_write().
|
|
*/
|
|
void
|
|
isc_log_write1(isc_log_t *lctx, isc_logcategory_t *category,
|
|
isc_logmodule_t *module, int level, const char *format, ...)
|
|
|
|
ISC_FORMAT_PRINTF(5, 6);
|
|
|
|
/*%
|
|
* Write a message to the log channels, pruning duplicates that occur within
|
|
* a configurable amount of seconds (see isc_log_[sg]etduplicateinterval).
|
|
* This function is otherwise identical to isc_log_vwrite().
|
|
*/
|
|
void
|
|
isc_log_vwrite1(isc_log_t *lctx, isc_logcategory_t *category,
|
|
isc_logmodule_t *module, int level, const char *format,
|
|
va_list args)
|
|
|
|
ISC_FORMAT_PRINTF(5, 0);
|
|
|
|
/*%
|
|
* These are four internationalized versions of the isc_log_[v]write[1]
|
|
* functions.
|
|
*
|
|
* The only difference is that they take arguments for a message
|
|
* catalog, message set, and message number, all immediately preceding the
|
|
* format argument. The format argument becomes the default text, a la
|
|
* isc_msgcat_get. If the message catalog is NULL, no lookup is attempted
|
|
* for a message -- which makes the message set and message number irrelevant,
|
|
* and the non-internationalized call should have probably been used instead.
|
|
*
|
|
* Yes, that means there are now *eight* interfaces to logging a message.
|
|
* Sheesh. Make the madness stop!
|
|
*/
|
|
/*@{*/
|
|
void
|
|
isc_log_iwrite(isc_log_t *lctx, isc_logcategory_t *category,
|
|
isc_logmodule_t *module, int level,
|
|
isc_msgcat_t *msgcat, int msgset, int message,
|
|
const char *format, ...)
|
|
ISC_FORMAT_PRINTF(8, 9);
|
|
|
|
void
|
|
isc_log_ivwrite(isc_log_t *lctx, isc_logcategory_t *category,
|
|
isc_logmodule_t *module, int level,
|
|
isc_msgcat_t *msgcat, int msgset, int message,
|
|
const char *format, va_list args)
|
|
ISC_FORMAT_PRINTF(8, 0);
|
|
|
|
void
|
|
isc_log_iwrite1(isc_log_t *lctx, isc_logcategory_t *category,
|
|
isc_logmodule_t *module, int level,
|
|
isc_msgcat_t *msgcat, int msgset, int message,
|
|
const char *format, ...)
|
|
ISC_FORMAT_PRINTF(8, 9);
|
|
|
|
void
|
|
isc_log_ivwrite1(isc_log_t *lctx, isc_logcategory_t *category,
|
|
isc_logmodule_t *module, int level,
|
|
isc_msgcat_t *msgcat, int msgset, int message,
|
|
const char *format, va_list args)
|
|
ISC_FORMAT_PRINTF(8, 0);
|
|
/*@}*/
|
|
|
|
void
|
|
isc_log_setdebuglevel(isc_log_t *lctx, unsigned int level);
|
|
/*%<
|
|
* Set the debugging level used for logging.
|
|
*
|
|
* Notes:
|
|
*\li Setting the debugging level to 0 disables debugging log messages.
|
|
*
|
|
* Requires:
|
|
*\li lctx is a valid logging context.
|
|
*
|
|
* Ensures:
|
|
*\li The debugging level is set to the requested value.
|
|
*/
|
|
|
|
unsigned int
|
|
isc_log_getdebuglevel(isc_log_t *lctx);
|
|
/*%<
|
|
* Get the current debugging level.
|
|
*
|
|
* Notes:
|
|
*\li This is provided so that a program can have a notion of
|
|
* "increment debugging level" or "decrement debugging level"
|
|
* without needing to keep track of what the current level is.
|
|
*
|
|
*\li A return value of 0 indicates that debugging messages are disabled.
|
|
*
|
|
* Requires:
|
|
*\li lctx is a valid logging context.
|
|
*
|
|
* Ensures:
|
|
*\li The current logging debugging level is returned.
|
|
*/
|
|
|
|
isc_boolean_t
|
|
isc_log_wouldlog(isc_log_t *lctx, int level);
|
|
/*%<
|
|
* Determine whether logging something to 'lctx' at 'level' would
|
|
* actually cause something to be logged somewhere.
|
|
*
|
|
* If #ISC_FALSE is returned, it is guaranteed that nothing would
|
|
* be logged, allowing the caller to omit unnecessary
|
|
* isc_log_write() calls and possible message preformatting.
|
|
*/
|
|
|
|
void
|
|
isc_log_setduplicateinterval(isc_logconfig_t *lcfg, unsigned int interval);
|
|
/*%<
|
|
* Set the interval over which duplicate log messages will be ignored
|
|
* by isc_log_[v]write1(), in seconds.
|
|
*
|
|
* Notes:
|
|
*\li Increasing the duplicate interval from X to Y will not necessarily
|
|
* filter out duplicates of messages logged in Y - X seconds since the
|
|
* increase. (Example: Message1 is logged at midnight. Message2
|
|
* is logged at 00:01:00, when the interval is only 30 seconds, causing
|
|
* Message1 to be expired from the log message history. Then the interval
|
|
* is increased to 3000 (five minutes) and at 00:04:00 Message1 is logged
|
|
* again. It will appear the second time even though less than five
|
|
* passed since the first occurrence.
|
|
*
|
|
* Requires:
|
|
*\li lctx is a valid logging context.
|
|
*/
|
|
|
|
unsigned int
|
|
isc_log_getduplicateinterval(isc_logconfig_t *lcfg);
|
|
/*%<
|
|
* Get the current duplicate filtering interval.
|
|
*
|
|
* Requires:
|
|
*\li lctx is a valid logging context.
|
|
*
|
|
* Returns:
|
|
*\li The current duplicate filtering interval.
|
|
*/
|
|
|
|
isc_result_t
|
|
isc_log_settag(isc_logconfig_t *lcfg, const char *tag);
|
|
/*%<
|
|
* Set the program name or other identifier for #ISC_LOG_PRINTTAG.
|
|
*
|
|
* Requires:
|
|
*\li lcfg is a valid logging configuration.
|
|
*
|
|
* Notes:
|
|
*\li If this function has not set the tag to a non-NULL, non-empty value,
|
|
* then the #ISC_LOG_PRINTTAG channel flag will not print anything.
|
|
* Unlike some implementations of syslog on Unix systems, you *must* set
|
|
* the tag in order to get it logged. It is not implicitly derived from
|
|
* the program name (which is pretty impossible to infer portably).
|
|
*
|
|
*\li Setting the tag to NULL or the empty string will also cause the
|
|
* #ISC_LOG_PRINTTAG channel flag to not print anything. If tag equals the
|
|
* empty string, calls to isc_log_gettag will return NULL.
|
|
*
|
|
* Returns:
|
|
*\li #ISC_R_SUCCESS Success
|
|
*\li #ISC_R_NOMEMORY Resource Limit: Out of memory
|
|
*
|
|
* XXXDCL when creating a new isc_logconfig_t, it might be nice if the tag
|
|
* of the currently active isc_logconfig_t was inherited. this does not
|
|
* currently happen.
|
|
*/
|
|
|
|
char *
|
|
isc_log_gettag(isc_logconfig_t *lcfg);
|
|
/*%<
|
|
* Get the current identifier printed with #ISC_LOG_PRINTTAG.
|
|
*
|
|
* Requires:
|
|
*\li lcfg is a valid logging configuration.
|
|
*
|
|
* Notes:
|
|
*\li Since isc_log_settag() will not associate a zero-length string
|
|
* with the logging configuration, attempts to do so will cause
|
|
* this function to return NULL. However, a determined programmer
|
|
* will observe that (currently) a tag of length greater than zero
|
|
* could be set, and then modified to be zero length.
|
|
*
|
|
* Returns:
|
|
*\li A pointer to the current identifier, or NULL if none has been set.
|
|
*/
|
|
|
|
void
|
|
isc_log_opensyslog(const char *tag, int options, int facility);
|
|
/*%<
|
|
* Initialize syslog logging.
|
|
*
|
|
* Notes:
|
|
*\li XXXDCL NT
|
|
* This is currently equivalent to openlog(), but is not going to remain
|
|
* that way. In the meantime, the arguments are all identical to
|
|
* those used by openlog(3), as follows:
|
|
*
|
|
* \code
|
|
* tag: The string to use in the position of the program
|
|
* name in syslog messages. Most (all?) syslogs
|
|
* will use basename(argv[0]) if tag is NULL.
|
|
*
|
|
* options: LOG_CONS, LOG_PID, LOG_NDELAY ... whatever your
|
|
* syslog supports.
|
|
*
|
|
* facility: The default syslog facility. This is irrelevant
|
|
* since isc_log_write will ALWAYS use the channel's
|
|
* declared facility.
|
|
* \endcode
|
|
*
|
|
*\li Zero effort has been made (yet) to accommodate systems with openlog()
|
|
* that only takes two arguments, or to identify valid syslog
|
|
* facilities or options for any given architecture.
|
|
*
|
|
*\li It is necessary to call isc_log_opensyslog() to initialize
|
|
* syslogging on machines which do not support network connections to
|
|
* syslogd because they require a Unix domain socket to be used. Since
|
|
* this is a chore to determine at run-time, it is suggested that it
|
|
* always be called by programs using the ISC logging system.
|
|
*
|
|
* Requires:
|
|
*\li Nothing.
|
|
*
|
|
* Ensures:
|
|
*\li openlog() is called to initialize the syslog system.
|
|
*/
|
|
|
|
void
|
|
isc_log_closefilelogs(isc_log_t *lctx);
|
|
/*%<
|
|
* Close all open files used by #ISC_LOG_TOFILE channels.
|
|
*
|
|
* Notes:
|
|
*\li This function is provided for programs that want to use their own
|
|
* log rolling mechanism rather than the one provided internally.
|
|
* For example, a program that wanted to keep daily logs would define
|
|
* a channel which used #ISC_LOG_ROLLNEVER, then once a day would
|
|
* rename the log file and call isc_log_closefilelogs().
|
|
*
|
|
*\li #ISC_LOG_TOFILEDESC channels are unaffected.
|
|
*
|
|
* Requires:
|
|
*\li lctx is a valid context.
|
|
*
|
|
* Ensures:
|
|
*\li The open files are closed and will be reopened when they are
|
|
* next needed.
|
|
*/
|
|
|
|
isc_logcategory_t *
|
|
isc_log_categorybyname(isc_log_t *lctx, const char *name);
|
|
/*%<
|
|
* Find a category by its name.
|
|
*
|
|
* Notes:
|
|
*\li The string name of a category is not required to be unique.
|
|
*
|
|
* Requires:
|
|
*\li lctx is a valid context.
|
|
*\li name is not NULL.
|
|
*
|
|
* Returns:
|
|
*\li A pointer to the _first_ isc_logcategory_t structure used by "name".
|
|
*
|
|
*\li NULL if no category exists by that name.
|
|
*/
|
|
|
|
isc_logmodule_t *
|
|
isc_log_modulebyname(isc_log_t *lctx, const char *name);
|
|
/*%<
|
|
* Find a module by its name.
|
|
*
|
|
* Notes:
|
|
*\li The string name of a module is not required to be unique.
|
|
*
|
|
* Requires:
|
|
*\li lctx is a valid context.
|
|
*\li name is not NULL.
|
|
*
|
|
* Returns:
|
|
*\li A pointer to the _first_ isc_logmodule_t structure used by "name".
|
|
*
|
|
*\li NULL if no module exists by that name.
|
|
*/
|
|
|
|
void
|
|
isc_log_setcontext(isc_log_t *lctx);
|
|
/*%<
|
|
* Sets the context used by the libisc for logging.
|
|
*
|
|
* Requires:
|
|
*\li lctx be a valid context.
|
|
*/
|
|
|
|
ISC_LANG_ENDDECLS
|
|
|
|
#endif /* ISC_LOG_H */
|