Adding upstream version 7.0.6-dfsg.upstream/7.0.6-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2869 insertions, 0 deletions

diff --git a/include/iprt/log.h b/include/iprt/log.h
new file mode 100644
index 00000000..fd677b71
--- /dev/null
+++ b/include/iprt/log.h
@@ -0,0 +1,2869 @@
+/** @file
+ * IPRT - Logging.
+ */
+
+/*
+ * Copyright (C) 2006-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.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, in version 3 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, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+#ifndef IPRT_INCLUDED_log_h
+#define IPRT_INCLUDED_log_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+#include <iprt/cdefs.h>
+#include <iprt/types.h>
+#include <iprt/stdarg.h>
+
+RT_C_DECLS_BEGIN
+
+/** @defgroup grp_rt_log    RTLog - Logging
+ * @ingroup grp_rt
+ * @{
+ */
+
+/**
+ * IPRT Logging Groups.
+ * (Remember to update RT_LOGGROUP_NAMES!)
+ *
+ * @remark It should be pretty obvious, but just to have
+ *         mentioned it, the values are sorted alphabetically (using the
+ *         english alphabet) except for _DEFAULT which is always first.
+ *
+ *         If anyone might be wondering what the alphabet looks like:
+ *              a b c d e f g h i j k l m n o p q r s t u v w x y z
+ */
+typedef enum RTLOGGROUP
+{
+    /** Default logging group. */
+    RTLOGGROUP_DEFAULT,
+    RTLOGGROUP_CRYPTO,
+    RTLOGGROUP_DBG,
+    RTLOGGROUP_DBG_DWARF,
+    RTLOGGROUP_DIR,
+    RTLOGGROUP_FILE,
+    RTLOGGROUP_FS,
+    RTLOGGROUP_FTP,
+    RTLOGGROUP_HTTP,
+    RTLOGGROUP_IOQUEUE,
+    RTLOGGROUP_LDR,
+    RTLOGGROUP_LOCALIPC,
+    RTLOGGROUP_PATH,
+    RTLOGGROUP_PROCESS,
+    RTLOGGROUP_REST,
+    RTLOGGROUP_SYMLINK,
+    RTLOGGROUP_THREAD,
+    RTLOGGROUP_TIME,
+    RTLOGGROUP_TIMER,
+    RTLOGGROUP_VFS,
+    RTLOGGROUP_ZIP = 31,
+    RTLOGGROUP_FIRST_USER = 32
+} RTLOGGROUP;
+
+/** @def RT_LOGGROUP_NAMES
+ * IPRT Logging group names.
+ *
+ * Must correspond 100% to RTLOGGROUP!
+ * Don't forget commas!
+ *
+ * @remark It should be pretty obvious, but just to have
+ *         mentioned it, the values are sorted alphabetically (using the
+ *         english alphabet) except for _DEFAULT which is always first.
+ *
+ *         If anyone might be wondering what the alphabet looks like:
+ *              a b c d e f g h i j k l m n o p q r s t u v w x y z
+ *
+ * The RT_XX log group names are placeholders for new modules being added,
+ * to make sure that there always is a total of 32 log group entries.
+ */
+#define RT_LOGGROUP_NAMES \
+    "DEFAULT", \
+    "RT_CRYPTO", \
+    "RT_DBG", \
+    "RT_DBG_DWARF", \
+    "RT_DIR", \
+    "RT_FILE", \
+    "RT_FS", \
+    "RT_FTP", \
+    "RT_HTTP", \
+    "RT_IOQUEUE", \
+    "RT_LDR", \
+    "RT_LOCALIPC", \
+    "RT_PATH", \
+    "RT_PROCESS", \
+    "RT_REST", \
+    "RT_SYMLINK", \
+    "RT_THREAD", \
+    "RT_TIME", \
+    "RT_TIMER", \
+    "RT_VFS", \
+    "RT_20", \
+    "RT_21", \
+    "RT_22", \
+    "RT_23", \
+    "RT_24", \
+    "RT_25", \
+    "RT_26", \
+    "RT_27", \
+    "RT_28", \
+    "RT_29", \
+    "RT_30", \
+    "RT_ZIP"
+
+
+/** @def LOG_GROUP
+ * Active logging group.
+ */
+#ifndef LOG_GROUP
+# define LOG_GROUP          RTLOGGROUP_DEFAULT
+#endif
+
+/** @def LOG_FN_FMT
+ * You can use this to specify your desired way of printing __PRETTY_FUNCTION__
+ * if you dislike the default one.
+ */
+#ifndef LOG_FN_FMT
+# define LOG_FN_FMT "%Rfn"
+#endif
+
+#ifdef LOG_INSTANCE
+# error "LOG_INSTANCE is no longer supported."
+#endif
+#ifdef LOG_REL_INSTANCE
+# error "LOG_REL_INSTANCE is no longer supported."
+#endif
+
+/** Logger structure. */
+typedef struct RTLOGGER RTLOGGER;
+/** Pointer to logger structure. */
+typedef RTLOGGER *PRTLOGGER;
+/** Pointer to const logger structure. */
+typedef const RTLOGGER *PCRTLOGGER;
+
+
+/** Pointer to a log buffer descriptor. */
+typedef struct RTLOGBUFFERDESC *PRTLOGBUFFERDESC;
+
+
+/**
+ * Logger phase.
+ *
+ * Used for signalling the log header/footer callback what to do.
+ */
+typedef enum RTLOGPHASE
+{
+    /** Begin of the logging. */
+    RTLOGPHASE_BEGIN = 0,
+    /** End of the logging. */
+    RTLOGPHASE_END,
+    /** Before rotating the log file. */
+    RTLOGPHASE_PREROTATE,
+    /** After rotating the log file. */
+    RTLOGPHASE_POSTROTATE,
+    /** 32-bit type blow up hack.  */
+    RTLOGPHASE_32BIT_HACK = 0x7fffffff
+} RTLOGPHASE;
+
+
+#if 0 /* retired */
+/**
+ * Logger function.
+ *
+ * @param   pszFormat   Format string.
+ * @param   ...         Optional arguments as specified in the format string.
+ */
+typedef DECLCALLBACKTYPE(void, FNRTLOGGER,(const char *pszFormat, ...)) RT_IPRT_FORMAT_ATTR(1, 2);
+/** Pointer to logger function. */
+typedef FNRTLOGGER *PFNRTLOGGER;
+#endif
+
+/**
+ * Custom buffer flushing function.
+ *
+ * @retval  true if flushed and the buffer can be reused.
+ * @retval  false for switching to the next buffer because an async flush of
+ *          @a pBufDesc is still pending.  The implementation is responsible for
+ *          only returning when the next buffer is ready for reuse, the generic
+ *          logger code has no facility to make sure of this.
+ *
+ * @param   pLogger     Pointer to the logger instance which is to be flushed.
+ * @param   pBufDesc    The descriptor of the buffer to be flushed.
+ */
+typedef DECLCALLBACKTYPE(bool, FNRTLOGFLUSH,(PRTLOGGER pLogger, PRTLOGBUFFERDESC pBufDesc));
+/** Pointer to flush function. */
+typedef FNRTLOGFLUSH *PFNRTLOGFLUSH;
+
+/**
+ * Header/footer message callback.
+ *
+ * @param   pLogger     Pointer to the logger instance.
+ * @param   pszFormat   Format string.
+ * @param   ...         Optional arguments specified in the format string.
+ */
+typedef DECLCALLBACKTYPE(void, FNRTLOGPHASEMSG,(PRTLOGGER pLogger, const char *pszFormat, ...)) RT_IPRT_FORMAT_ATTR(2, 3);
+/** Pointer to header/footer message callback function. */
+typedef FNRTLOGPHASEMSG *PFNRTLOGPHASEMSG;
+
+/**
+ * Log file header/footer callback.
+ *
+ * @param   pLogger         Pointer to the logger instance.
+ * @param   enmLogPhase     Indicates at what time the callback is invoked.
+ * @param   pfnLogPhaseMsg  Callback for writing the header/footer (RTLogPrintf
+ *                          and others are out of bounds).
+ */
+typedef DECLCALLBACKTYPE(void, FNRTLOGPHASE,(PRTLOGGER pLogger, RTLOGPHASE enmLogPhase, PFNRTLOGPHASEMSG pfnLogPhaseMsg));
+/** Pointer to log header/footer callback function. */
+typedef FNRTLOGPHASE *PFNRTLOGPHASE;
+
+/**
+ * Custom log prefix callback.
+ *
+ *
+ * @returns The number of chars written.
+ *
+ * @param   pLogger     Pointer to the logger instance.
+ * @param   pchBuf      Output buffer pointer.
+ *                      No need to terminate the output.
+ * @param   cchBuf      The size of the output buffer.
+ * @param   pvUser      The user argument.
+ */
+typedef DECLCALLBACKTYPE(size_t, FNRTLOGPREFIX,(PRTLOGGER pLogger, char *pchBuf, size_t cchBuf, void *pvUser));
+/** Pointer to prefix callback function. */
+typedef FNRTLOGPREFIX *PFNRTLOGPREFIX;
+
+
+/** Pointer to a constant log output interface. */
+typedef const struct RTLOGOUTPUTIF *PCRTLOGOUTPUTIF;
+
+/**
+ * Logging output interface.
+ */
+typedef struct RTLOGOUTPUTIF
+{
+    /**
+     * Opens a new log file with the given name.
+     *
+     * @returns IPRT status code.
+     * @param   pIf             Pointer to this interface.
+     * @param   pvUser          Opaque user data passed when setting the callbacks.
+     * @param   pszFilename     The filename to open.
+     * @param   fFlags          Open flags, combination of RTFILE_O_XXX.
+     */
+    DECLR3CALLBACKMEMBER(int, pfnOpen, (PCRTLOGOUTPUTIF pIf, void *pvUser, const char *pszFilename, uint32_t fFlags));
+
+    /**
+     * Closes the currently open file.
+     *
+     * @returns IPRT status code.
+     * @param   pIf             Pointer to this interface.
+     * @param   pvUser          Opaque user data passed when setting the callbacks.
+     */
+    DECLR3CALLBACKMEMBER(int, pfnClose, (PCRTLOGOUTPUTIF pIf, void *pvUser));
+
+    /**
+     * Deletes the given file.
+     *
+     * @returns IPRT status code.
+     * @param   pIf             Pointer to this interface.
+     * @param   pvUser          Opaque user data passed when setting the callbacks.
+     * @param   pszFilename     The filename to delete.
+     */
+    DECLR3CALLBACKMEMBER(int, pfnDelete, (PCRTLOGOUTPUTIF pIf, void *pvUser, const char *pszFilename));
+
+    /**
+     * Renames the given file.
+     *
+     * @returns IPRT status code.
+     * @param   pIf             Pointer to this interface.
+     * @param   pvUser          Opaque user data passed when setting the callbacks.
+     * @param   pszFilenameOld  The old filename to rename.
+     * @param   pszFilenameNew  The new filename.
+     * @param   fFlags          Flags for the operation, combination of RTFILEMOVE_FLAGS_XXX.
+     */
+    DECLR3CALLBACKMEMBER(int, pfnRename, (PCRTLOGOUTPUTIF pIf, void *pvUser, const char *pszFilenameOld,
+                                          const char *pszFilenameNew, uint32_t fFlags));
+
+    /**
+     * Queries the size of the log file.
+     *
+     * @returns IPRT status code.
+     * @param   pIf             Pointer to this interface.
+     * @param   pvUser          Opaque user data passed when setting the callbacks.
+     * @param   pcbFile         Where to store the file size in bytes on success.
+     */
+    DECLR3CALLBACKMEMBER(int, pfnQuerySize, (PCRTLOGOUTPUTIF pIf, void *pvUser, uint64_t *pcbSize));
+
+    /**
+     * Writes data to the log file.
+     *
+     * @returns IPRT status code.
+     * @param   pIf             Pointer to this interface.
+     * @param   pvUser          Opaque user data passed when setting the callbacks.
+     * @param   pvBuf           The data to write.
+     * @param   cbWrite         Number of bytes to write.
+     * @param   pcbWritten      Where to store the actual number of bytes written on success.
+     */
+    DECLR3CALLBACKMEMBER(int, pfnWrite, (PCRTLOGOUTPUTIF pIf, void *pvUser, const void *pvBuf,
+                                         size_t cbWrite, size_t *pcbWritten));
+
+    /**
+     * Flushes data to the underlying storage medium.
+     *
+     * @returns IPRT status code.
+     * @param   pIf             Pointer to this interface.
+     * @param   pvUser          Opaque user data passed when setting the callbacks.
+     */
+    DECLR3CALLBACKMEMBER(int, pfnFlush, (PCRTLOGOUTPUTIF pIf, void *pvUser));
+} RTLOGOUTPUTIF;
+/** Pointer to a logging output interface. */
+typedef struct RTLOGOUTPUTIF *PRTLOGOUTPUTIF;
+
+
+/**
+ * Auxiliary buffer descriptor.
+ *
+ * This is what we share we ring-3 and use for flushing ring-0 EMT loggers when
+ * we return to ring-3.
+ */
+typedef struct RTLOGBUFFERAUXDESC
+{
+    /** Flush indicator.
+     * Ring-3 sets this if it flushed the buffer, ring-0 clears it again after
+     * writing. */
+    bool volatile           fFlushedIndicator;
+    bool                    afPadding[3];
+    /** Copy of RTLOGBUFFERDESC::offBuf. */
+    uint32_t                offBuf;
+} RTLOGBUFFERAUXDESC;
+/** Pointer to auxiliary buffer descriptor. */
+typedef RTLOGBUFFERAUXDESC *PRTLOGBUFFERAUXDESC;
+
+/**
+ * Log buffer desciptor.
+ */
+typedef struct RTLOGBUFFERDESC
+{
+    /** Magic value / eye catcher (RTLOGBUFFERDESC_MAGIC). */
+    uint32_t                u32Magic;
+    /** Padding. */
+    uint32_t                uReserved;
+    /** The buffer size. */
+    uint32_t                cbBuf;
+    /** The current buffer offset. */
+    uint32_t                offBuf;
+    /** Pointer to the buffer. */
+    char                   *pchBuf;
+    /** Pointer to auxiliary desciptor, NULL if not used. */
+    PRTLOGBUFFERAUXDESC     pAux;
+} RTLOGBUFFERDESC;
+
+/** RTLOGBUFFERDESC::u32Magic value. (Avram Noam Chomsky) */
+#define RTLOGBUFFERDESC_MAGIC   UINT32_C(0x19281207)
+
+/**
+ * The public logger instance part.
+ *
+ * The logger instance is mostly abstract and kept as RTLOGGERINTERNAL within
+ * log.cpp.  This public part is at the start of RTLOGGERINTERNAL.
+ */
+struct RTLOGGER
+{
+    /** Magic number (RTLOGGER_MAGIC). */
+    uint32_t                u32Magic;
+    /** User value \#1, initialized to zero. */
+    uint32_t                u32UserValue1;
+    /** User value \#2, initialized to zero. */
+    uint64_t                u64UserValue2;
+    /** User value \#3, initialized to zero. */
+    uint64_t                u64UserValue3;
+#if 0
+    /** Pointer to the logger function (used in non-C99 mode only).
+     *
+     * This is actually pointer to a wrapper/stub function which will push a pointer
+     * to the instance pointer onto the stack before jumping to the real logger
+     * function.  A very unfortunate hack to work around the missing variadic macro
+     * support in older C++/C standards.  (The memory is allocated using
+     * RTMemExecAlloc(), except for agnostic R0 code.) */
+    PFNRTLOGGER             pfnLogger;
+#else
+    /** Unused. */
+    uintptr_t               uUsedToBeNonC99Logger;
+#endif
+#if ARCH_BITS == 32
+    /** Explicit padding. */
+    uint32_t                uReserved1;
+#endif
+};
+
+/** RTLOGGER::u32Magic value. (John Rogers Searle) */
+#define RTLOGGER_MAGIC          UINT32_C(0x19320731)
+
+/**
+ * Logger flags.
+ */
+typedef enum RTLOGFLAGS
+{
+    /** The logger instance is disabled for normal output. */
+    RTLOGFLAGS_DISABLED             = 0x00000001,
+    /** The logger instance is using buffered output. */
+    RTLOGFLAGS_BUFFERED             = 0x00000002,
+    /** The logger instance expands LF to CR/LF. */
+    RTLOGFLAGS_USECRLF              = 0x00000010,
+    /** Append to the log destination where applicable. */
+    RTLOGFLAGS_APPEND               = 0x00000020,
+    /** Show relative timestamps with PREFIX_TSC and PREFIX_TS */
+    RTLOGFLAGS_REL_TS               = 0x00000040,
+    /** Show decimal timestamps with PREFIX_TSC and PREFIX_TS */
+    RTLOGFLAGS_DECIMAL_TS           = 0x00000080,
+    /** Open the file in write through mode. */
+    RTLOGFLAGS_WRITE_THROUGH        = 0x00000100,
+    /** Flush the file to disk when flushing the buffer. */
+    RTLOGFLAGS_FLUSH                = 0x00000200,
+    /** Restrict the number of log entries per group. */
+    RTLOGFLAGS_RESTRICT_GROUPS      = 0x00000400,
+    /** New lines should be prefixed with the write and read lock counts. */
+    RTLOGFLAGS_PREFIX_LOCK_COUNTS   = 0x00008000,
+    /** New lines should be prefixed with the CPU id (ApicID on intel/amd). */
+    RTLOGFLAGS_PREFIX_CPUID         = 0x00010000,
+    /** New lines should be prefixed with the native process id. */
+    RTLOGFLAGS_PREFIX_PID           = 0x00020000,
+    /** New lines should be prefixed with group flag number causing the output. */
+    RTLOGFLAGS_PREFIX_FLAG_NO       = 0x00040000,
+    /** New lines should be prefixed with group flag name causing the output. */
+    RTLOGFLAGS_PREFIX_FLAG          = 0x00080000,
+    /** New lines should be prefixed with group number. */
+    RTLOGFLAGS_PREFIX_GROUP_NO      = 0x00100000,
+    /** New lines should be prefixed with group name. */
+    RTLOGFLAGS_PREFIX_GROUP         = 0x00200000,
+    /** New lines should be prefixed with the native thread id. */
+    RTLOGFLAGS_PREFIX_TID           = 0x00400000,
+    /** New lines should be prefixed with thread name. */
+    RTLOGFLAGS_PREFIX_THREAD        = 0x00800000,
+    /** New lines should be prefixed with data from a custom callback. */
+    RTLOGFLAGS_PREFIX_CUSTOM        = 0x01000000,
+    /** New lines should be prefixed with formatted timestamp since program start. */
+    RTLOGFLAGS_PREFIX_TIME_PROG     = 0x04000000,
+    /** New lines should be prefixed with formatted timestamp (UCT). */
+    RTLOGFLAGS_PREFIX_TIME          = 0x08000000,
+    /** New lines should be prefixed with milliseconds since program start. */
+    RTLOGFLAGS_PREFIX_MS_PROG       = 0x10000000,
+    /** New lines should be prefixed with timestamp. */
+    RTLOGFLAGS_PREFIX_TSC           = 0x20000000,
+    /** New lines should be prefixed with timestamp. */
+    RTLOGFLAGS_PREFIX_TS            = 0x40000000,
+    /** The prefix mask. */
+    RTLOGFLAGS_PREFIX_MASK          = 0x7dff8000
+} RTLOGFLAGS;
+/** Don't use locking. */
+#define RTLOG_F_NO_LOCKING          RT_BIT_64(63)
+/** Mask with all valid log flags (for validation). */
+#define RTLOG_F_VALID_MASK          UINT64_C(0x800000007fff87f3)
+
+/**
+ * Logger per group flags.
+ *
+ * @remarks We only use the lower 16 bits here.  We'll be combining it with the
+ *          group number in a few places.
+ */
+typedef enum RTLOGGRPFLAGS
+{
+    /** Enabled. */
+    RTLOGGRPFLAGS_ENABLED      = 0x0001,
+    /** Flow logging. */
+    RTLOGGRPFLAGS_FLOW         = 0x0002,
+    /** Warnings logging. */
+    RTLOGGRPFLAGS_WARN         = 0x0004,
+    /* 0x0008 for later. */
+    /** Level 1 logging. */
+    RTLOGGRPFLAGS_LEVEL_1      = 0x0010,
+    /** Level 2 logging. */
+    RTLOGGRPFLAGS_LEVEL_2      = 0x0020,
+    /** Level 3 logging. */
+    RTLOGGRPFLAGS_LEVEL_3      = 0x0040,
+    /** Level 4 logging. */
+    RTLOGGRPFLAGS_LEVEL_4      = 0x0080,
+    /** Level 5 logging. */
+    RTLOGGRPFLAGS_LEVEL_5      = 0x0100,
+    /** Level 6 logging. */
+    RTLOGGRPFLAGS_LEVEL_6      = 0x0200,
+    /** Level 7 logging. */
+    RTLOGGRPFLAGS_LEVEL_7      = 0x0400,
+    /** Level 8 logging. */
+    RTLOGGRPFLAGS_LEVEL_8      = 0x0800,
+    /** Level 9 logging. */
+    RTLOGGRPFLAGS_LEVEL_9      = 0x1000,
+    /** Level 10 logging. */
+    RTLOGGRPFLAGS_LEVEL_10     = 0x2000,
+    /** Level 11 logging. */
+    RTLOGGRPFLAGS_LEVEL_11     = 0x4000,
+    /** Level 12 logging. */
+    RTLOGGRPFLAGS_LEVEL_12     = 0x8000,
+
+    /** Restrict the number of log entries. */
+    RTLOGGRPFLAGS_RESTRICT     = 0x40000000,
+    /** Blow up the type. */
+    RTLOGGRPFLAGS_32BIT_HACK   = 0x7fffffff
+} RTLOGGRPFLAGS;
+
+/**
+ * Logger destination types and flags.
+ */
+typedef enum RTLOGDEST
+{
+    /** Log to file. */
+    RTLOGDEST_FILE          = 0x00000001,
+    /** Log to stdout. */
+    RTLOGDEST_STDOUT        = 0x00000002,
+    /** Log to stderr. */
+    RTLOGDEST_STDERR        = 0x00000004,
+    /** Log to debugger (win32 only). */
+    RTLOGDEST_DEBUGGER      = 0x00000008,
+    /** Log to com port. */
+    RTLOGDEST_COM           = 0x00000010,
+    /** Log a memory ring buffer. */
+    RTLOGDEST_RINGBUF       = 0x00000020,
+    /** The parent VMM debug log. */
+    RTLOGDEST_VMM           = 0x00000040,
+    /** The parent VMM release log. */
+    RTLOGDEST_VMM_REL       = 0x00000080,
+    /** Open files with no deny (share read, write, delete) on Windows. */
+    RTLOGDEST_F_NO_DENY     = 0x00010000,
+    /** Delay opening the log file, logging to the buffer untill
+     * RTLogClearFileDelayFlag is called. */
+    RTLOGDEST_F_DELAY_FILE  = 0x00020000,
+    /** Don't allow changes to the filename or mode of opening it. */
+    RTLOGDEST_FIXED_FILE    = 0x01000000,
+    /** Don't allow changing the directory. */
+    RTLOGDEST_FIXED_DIR     = 0x02000000,
+    /** Just a dummy flag to be used when no other flag applies. */
+    RTLOGDEST_DUMMY         = 0x20000000,
+    /** Log to a user defined output stream. */
+    RTLOGDEST_USER          = 0x40000000
+} RTLOGDEST;
+/** Valid log destinations. */
+#define RTLOG_DST_VALID_MASK    UINT32_C(0x630300ff)
+/** Log destinations that can be changed via RTLogChangeDestinations. */
+#define RTLOG_DST_CHANGE_MASK   UINT32_C(0x400000de)
+
+
+#ifdef DOXYGEN_RUNNING
+# define LOG_DISABLED
+# define LOG_ENABLED
+# define LOG_ENABLE_FLOW
+#endif
+
+/** @def LOG_DISABLED
+ * Use this compile time define to disable all logging macros. It can
+ * be overridden for each of the logging macros by the LOG_ENABLE*
+ * compile time defines.
+ */
+
+/** @def LOG_ENABLED
+ * Use this compile time define to enable logging when not in debug mode
+ * or LOG_DISABLED is set.
+ * This will enable Log() only.
+ */
+
+/** @def LOG_ENABLE_FLOW
+ * Use this compile time define to enable flow logging when not in
+ * debug mode or LOG_DISABLED is defined.
+ * This will enable LogFlow() only.
+ */
+
+/*
+ * Determine whether logging is enabled and forcefully normalize the indicators.
+ */
+#if (defined(DEBUG) || defined(LOG_ENABLED)) && !defined(LOG_DISABLED)
+# undef  LOG_DISABLED
+# undef  LOG_ENABLED
+# define LOG_ENABLED
+#else
+# undef  LOG_ENABLED
+# undef  LOG_DISABLED
+# define LOG_DISABLED
+#endif
+
+
+/** @def LOG_USE_C99
+ * Governs the use of variadic macros.
+ */
+#ifndef LOG_USE_C99
+# define LOG_USE_C99
+#endif
+
+
+/** @name Macros for checking whether a log level is enabled.
+ * @{ */
+/** @def LogIsItEnabled
+ * Checks whether the specified logging group is enabled or not.
+ */
+#ifdef LOG_ENABLED
+# define LogIsItEnabled(a_fFlags, a_iGroup) ( RTLogDefaultInstanceEx(RT_MAKE_U32(a_fFlags, a_iGroup)) != NULL )
+#else
+# define LogIsItEnabled(a_fFlags, a_iGroup) (false)
+#endif
+
+/** @def LogIsEnabled
+ * Checks whether level 1 logging is enabled.
+ */
+#define LogIsEnabled()      LogIsItEnabled(RTLOGGRPFLAGS_LEVEL_1, LOG_GROUP)
+
+/** @def LogIs2Enabled
+ * Checks whether level 2 logging is enabled.
+ */
+#define LogIs2Enabled()     LogIsItEnabled(RTLOGGRPFLAGS_LEVEL_2, LOG_GROUP)
+
+/** @def LogIs3Enabled
+ * Checks whether level 3 logging is enabled.
+ */
+#define LogIs3Enabled()     LogIsItEnabled(RTLOGGRPFLAGS_LEVEL_3, LOG_GROUP)
+
+/** @def LogIs4Enabled
+ * Checks whether level 4 logging is enabled.
+ */
+#define LogIs4Enabled()     LogIsItEnabled(RTLOGGRPFLAGS_LEVEL_4, LOG_GROUP)
+
+/** @def LogIs5Enabled
+ * Checks whether level 5 logging is enabled.
+ */
+#define LogIs5Enabled()     LogIsItEnabled(RTLOGGRPFLAGS_LEVEL_5, LOG_GROUP)
+
+/** @def LogIs6Enabled
+ * Checks whether level 6 logging is enabled.
+ */
+#define LogIs6Enabled()     LogIsItEnabled(RTLOGGRPFLAGS_LEVEL_6, LOG_GROUP)
+
+/** @def LogIs7Enabled
+ * Checks whether level 7 logging is enabled.
+ */
+#define LogIs7Enabled()     LogIsItEnabled(RTLOGGRPFLAGS_LEVEL_7, LOG_GROUP)
+
+/** @def LogIs8Enabled
+ * Checks whether level 8 logging is enabled.
+ */
+#define LogIs8Enabled()     LogIsItEnabled(RTLOGGRPFLAGS_LEVEL_8, LOG_GROUP)
+
+/** @def LogIs9Enabled
+ * Checks whether level 9 logging is enabled.
+ */
+#define LogIs9Enabled()     LogIsItEnabled(RTLOGGRPFLAGS_LEVEL_9, LOG_GROUP)
+
+/** @def LogIs10Enabled
+ * Checks whether level 10 logging is enabled.
+ */
+#define LogIs10Enabled()    LogIsItEnabled(RTLOGGRPFLAGS_LEVEL_10, LOG_GROUP)
+
+/** @def LogIs11Enabled
+ * Checks whether level 11 logging is enabled.
+ */
+#define LogIs11Enabled()    LogIsItEnabled(RTLOGGRPFLAGS_LEVEL_11, LOG_GROUP)
+
+/** @def LogIs12Enabled
+ * Checks whether level 12 logging is enabled.
+ */
+#define LogIs12Enabled()    LogIsItEnabled(RTLOGGRPFLAGS_LEVEL_12, LOG_GROUP)
+
+/** @def LogIsFlowEnabled
+ * Checks whether execution flow logging is enabled.
+ */
+#define LogIsFlowEnabled()  LogIsItEnabled(RTLOGGRPFLAGS_FLOW, LOG_GROUP)
+
+/** @def LogIsWarnEnabled
+ * Checks whether execution flow logging is enabled.
+ */
+#define LogIsWarnEnabled()  LogIsItEnabled(RTLOGGRPFLAGS_WARN, LOG_GROUP)
+/** @} */
+
+
+/** @def LogIt
+ * Write to specific logger if group enabled.
+ */
+#ifdef LOG_ENABLED
+# if defined(LOG_USE_C99)
+#  define _LogRemoveParentheseis(...)                   __VA_ARGS__
+#  define _LogIt(a_fFlags, a_iGroup, ...) \
+   do \
+   { \
+        PRTLOGGER LogIt_pLogger = RTLogDefaultInstanceEx(RT_MAKE_U32(a_fFlags, a_iGroup)); \
+        if (RT_LIKELY(!LogIt_pLogger)) \
+        {   /* likely */ } \
+        else \
+            RTLogLoggerEx(LogIt_pLogger, a_fFlags, a_iGroup, __VA_ARGS__); \
+   } while (0)
+#  define LogIt(a_fFlags, a_iGroup, fmtargs)            _LogIt(a_fFlags, a_iGroup, _LogRemoveParentheseis fmtargs)
+#  define _LogItAlways(a_fFlags, a_iGroup, ...)          RTLogLoggerEx(NULL, a_fFlags, UINT32_MAX, __VA_ARGS__)
+#  define LogItAlways(a_fFlags, a_iGroup, fmtargs)      _LogItAlways(a_fFlags, a_iGroup, _LogRemoveParentheseis fmtargs)
+        /** @todo invent a flag or something for skipping the group check so we can pass iGroup. LogItAlways. */
+# else
+#  define LogIt(a_fFlags, a_iGroup, fmtargs) \
+    do \
+    { \
+        PRTLOGGER LogIt_pLogger = RTLogDefaultInstanceEx(RT_MAKE_U32(a_fFlags, a_iGroup)); \
+        if (RT_LIKELY(!LogIt_pLogger)) \
+        {   /* likely */ } \
+        else \
+        { \
+            LogIt_pLogger->pfnLogger fmtargs; \
+        } \
+    } while (0)
+#  define LogItAlways(a_fFlags, a_iGroup, fmtargs) \
+    do \
+    { \
+        PRTLOGGER LogIt_pLogger = RTLogDefaultInstanceEx(RT_MAKE_U32(0, UINT16_MAX)); \
+        if (LogIt_pLogger) \
+            LogIt_pLogger->pfnLogger fmtargs; \
+    } while (0)
+# endif
+#else
+# define LogIt(a_fFlags, a_iGroup, fmtargs)             do { } while (0)
+# define LogItAlways(a_fFlags, a_iGroup, fmtargs)       do { } while (0)
+# if defined(LOG_USE_C99)
+#  define _LogRemoveParentheseis(...)                   __VA_ARGS__
+#  define _LogIt(a_fFlags, a_iGroup, ...)               do { } while (0)
+#  define _LogItAlways(a_fFlags, a_iGroup, ...)         do { } while (0)
+# endif
+#endif
+
+
+/** @name Basic logging macros
+ * @{ */
+/** @def Log
+ * Level 1 logging that works regardless of the group settings.
+ */
+#define LogAlways(a)    LogItAlways(RTLOGGRPFLAGS_LEVEL_1, LOG_GROUP, a)
+
+/** @def Log
+ * Level 1 logging.
+ */
+#define Log(a)          LogIt(RTLOGGRPFLAGS_LEVEL_1, LOG_GROUP, a)
+
+/** @def Log2
+ * Level 2 logging.
+ */
+#define Log2(a)         LogIt(RTLOGGRPFLAGS_LEVEL_2,  LOG_GROUP, a)
+
+/** @def Log3
+ * Level 3 logging.
+ */
+#define Log3(a)         LogIt(RTLOGGRPFLAGS_LEVEL_3,  LOG_GROUP, a)
+
+/** @def Log4
+ * Level 4 logging.
+ */
+#define Log4(a)         LogIt(RTLOGGRPFLAGS_LEVEL_4,  LOG_GROUP, a)
+
+/** @def Log5
+ * Level 5 logging.
+ */
+#define Log5(a)         LogIt(RTLOGGRPFLAGS_LEVEL_5,  LOG_GROUP, a)
+
+/** @def Log6
+ * Level 6 logging.
+ */
+#define Log6(a)         LogIt(RTLOGGRPFLAGS_LEVEL_6,  LOG_GROUP, a)
+
+/** @def Log7
+ * Level 7 logging.
+ */
+#define Log7(a)         LogIt(RTLOGGRPFLAGS_LEVEL_7,  LOG_GROUP, a)
+
+/** @def Log8
+ * Level 8 logging.
+ */
+#define Log8(a)         LogIt(RTLOGGRPFLAGS_LEVEL_8,  LOG_GROUP, a)
+
+/** @def Log9
+ * Level 9 logging.
+ */
+#define Log9(a)         LogIt(RTLOGGRPFLAGS_LEVEL_9,  LOG_GROUP, a)
+
+/** @def Log10
+ * Level 10 logging.
+ */
+#define Log10(a)        LogIt(RTLOGGRPFLAGS_LEVEL_10, LOG_GROUP, a)
+
+/** @def Log11
+ * Level 11 logging.
+ */
+#define Log11(a)        LogIt(RTLOGGRPFLAGS_LEVEL_11, LOG_GROUP, a)
+
+/** @def Log12
+ * Level 12 logging.
+ */
+#define Log12(a)        LogIt(RTLOGGRPFLAGS_LEVEL_12,  LOG_GROUP, a)
+
+/** @def LogFlow
+ * Logging of execution flow.
+ */
+#define LogFlow(a)      LogIt(RTLOGGRPFLAGS_FLOW,      LOG_GROUP, a)
+
+/** @def LogWarn
+ * Logging of warnings.
+ */
+#define LogWarn(a)      LogIt(RTLOGGRPFLAGS_WARN,      LOG_GROUP, a)
+/** @} */
+
+
+/** @name Logging macros prefixing the current function name.
+ * @{ */
+/** @def LogFunc
+ * Level 1 logging inside C/C++ functions.
+ *
+ * Prepends the given log message with the function name followed by a
+ * semicolon and space.
+ *
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define LogFunc(a)   _LogIt(RTLOGGRPFLAGS_LEVEL_1, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define LogFunc(a)   do { Log((LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log(a); } while (0)
+#endif
+
+/** @def Log2Func
+ * Level 2 logging inside C/C++ functions.
+ *
+ * Prepends the given log message with the function name followed by a
+ * semicolon and space.
+ *
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log2Func(a)  _LogIt(RTLOGGRPFLAGS_LEVEL_2, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log2Func(a)  do { Log2((LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log2(a); } while (0)
+#endif
+
+/** @def Log3Func
+ * Level 3 logging inside C/C++ functions.
+ *
+ * Prepends the given log message with the function name followed by a
+ * semicolon and space.
+ *
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log3Func(a)  _LogIt(RTLOGGRPFLAGS_LEVEL_3, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log3Func(a)  do { Log3((LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log3(a); } while (0)
+#endif
+
+/** @def Log4Func
+ * Level 4 logging inside C/C++ functions.
+ *
+ * Prepends the given log message with the function name followed by a
+ * semicolon and space.
+ *
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log4Func(a)  _LogIt(RTLOGGRPFLAGS_LEVEL_4, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log4Func(a)  do { Log4((LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log4(a); } while (0)
+#endif
+
+/** @def Log5Func
+ * Level 5 logging inside C/C++ functions.
+ *
+ * Prepends the given log message with the function name followed by a
+ * semicolon and space.
+ *
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log5Func(a)  _LogIt(RTLOGGRPFLAGS_LEVEL_5, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log5Func(a)  do { Log5((LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log5(a); } while (0)
+#endif
+
+/** @def Log6Func
+ * Level 6 logging inside C/C++ functions.
+ *
+ * Prepends the given log message with the function name followed by a
+ * semicolon and space.
+ *
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log6Func(a)  _LogIt(RTLOGGRPFLAGS_LEVEL_6, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log6Func(a)  do { Log6((LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log6(a); } while (0)
+#endif
+
+/** @def Log7Func
+ * Level 7 logging inside C/C++ functions.
+ *
+ * Prepends the given log message with the function name followed by a
+ * semicolon and space.
+ *
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log7Func(a)  _LogIt(RTLOGGRPFLAGS_LEVEL_7, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log7Func(a)  do { Log7((LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log7(a); } while (0)
+#endif
+
+/** @def Log8Func
+ * Level 8 logging inside C/C++ functions.
+ *
+ * Prepends the given log message with the function name followed by a
+ * semicolon and space.
+ *
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log8Func(a)  _LogIt(RTLOGGRPFLAGS_LEVEL_8, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log8Func(a)  do { Log8((LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log8(a); } while (0)
+#endif
+
+/** @def Log9Func
+ * Level 9 logging inside C/C++ functions.
+ *
+ * Prepends the given log message with the function name followed by a
+ * semicolon and space.
+ *
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log9Func(a)  _LogIt(RTLOGGRPFLAGS_LEVEL_9, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log9Func(a)  do { Log9((LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log9(a); } while (0)
+#endif
+
+/** @def Log10Func
+ * Level 10 logging inside C/C++ functions.
+ *
+ * Prepends the given log message with the function name followed by a
+ * semicolon and space.
+ *
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log10Func(a) _LogIt(RTLOGGRPFLAGS_LEVEL_10, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log10Func(a) do { Log10((LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log10(a); } while (0)
+#endif
+
+/** @def Log11Func
+ * Level 11 logging inside C/C++ functions.
+ *
+ * Prepends the given log message with the function name followed by a
+ * semicolon and space.
+ *
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log11Func(a) _LogIt(RTLOGGRPFLAGS_LEVEL_11, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log11Func(a) do { Log11((LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log11(a); } while (0)
+#endif
+
+/** @def Log12Func
+ * Level 12 logging inside C/C++ functions.
+ *
+ * Prepends the given log message with the function name followed by a
+ * semicolon and space.
+ *
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log12Func(a) _LogIt(RTLOGGRPFLAGS_LEVEL_12, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log12Func(a) do { Log12((LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log12(a); } while (0)
+#endif
+
+/** @def LogFlowFunc
+ * Macro to log the execution flow inside C/C++ functions.
+ *
+ * Prepends the given log message with the function name followed by
+ * a semicolon and space.
+ *
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define LogFlowFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_FLOW, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define LogFlowFunc(a) \
+    do { LogFlow((LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); LogFlow(a); } while (0)
+#endif
+
+/** @def LogWarnFunc
+ * Macro to log a warning inside C/C++ functions.
+ *
+ * Prepends the given log message with the function name followed by
+ * a semicolon and space.
+ *
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define LogWarnFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_WARN, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define LogWarnFunc(a) \
+    do { LogFlow((LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); LogFlow(a); } while (0)
+#endif
+/** @} */
+
+
+/** @name Logging macros prefixing the this pointer value and method name.
+ * @{ */
+
+/** @def LogThisFunc
+ * Level 1 logging inside a C++ non-static method, with object pointer and
+ * method name prefixed to the given message.
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define LogThisFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_LEVEL_1, LOG_GROUP, "{%p} " LOG_FN_FMT ": %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define LogThisFunc(a) do { Log(("{%p} " LOG_FN_FMT ": ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log(a); } while (0)
+#endif
+
+/** @def Log2ThisFunc
+ * Level 2 logging inside a C++ non-static method, with object pointer and
+ * method name prefixed to the given message.
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log2ThisFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_LEVEL_2, LOG_GROUP, "{%p} " LOG_FN_FMT ": %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log2ThisFunc(a) do { Log2(("{%p} " LOG_FN_FMT ": ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log2(a); } while (0)
+#endif
+
+/** @def Log3ThisFunc
+ * Level 3 logging inside a C++ non-static method, with object pointer and
+ * method name prefixed to the given message.
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log3ThisFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_LEVEL_3, LOG_GROUP, "{%p} " LOG_FN_FMT ": %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log3ThisFunc(a) do { Log3(("{%p} " LOG_FN_FMT ": ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log3(a); } while (0)
+#endif
+
+/** @def Log4ThisFunc
+ * Level 4 logging inside a C++ non-static method, with object pointer and
+ * method name prefixed to the given message.
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log4ThisFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_LEVEL_4, LOG_GROUP, "{%p} " LOG_FN_FMT ": %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log4ThisFunc(a) do { Log4(("{%p} " LOG_FN_FMT ": ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log4(a); } while (0)
+#endif
+
+/** @def Log5ThisFunc
+ * Level 5 logging inside a C++ non-static method, with object pointer and
+ * method name prefixed to the given message.
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log5ThisFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_LEVEL_5, LOG_GROUP, "{%p} " LOG_FN_FMT ": %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log5ThisFunc(a) do { Log5(("{%p} " LOG_FN_FMT ": ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log5(a); } while (0)
+#endif
+
+/** @def Log6ThisFunc
+ * Level 6 logging inside a C++ non-static method, with object pointer and
+ * method name prefixed to the given message.
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log6ThisFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_LEVEL_6, LOG_GROUP, "{%p} " LOG_FN_FMT ": %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log6ThisFunc(a) do { Log6(("{%p} " LOG_FN_FMT ": ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log6(a); } while (0)
+#endif
+
+/** @def Log7ThisFunc
+ * Level 7 logging inside a C++ non-static method, with object pointer and
+ * method name prefixed to the given message.
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log7ThisFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_LEVEL_7, LOG_GROUP, "{%p} " LOG_FN_FMT ": %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log7ThisFunc(a) do { Log7(("{%p} " LOG_FN_FMT ": ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log7(a); } while (0)
+#endif
+
+/** @def Log8ThisFunc
+ * Level 8 logging inside a C++ non-static method, with object pointer and
+ * method name prefixed to the given message.
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log8ThisFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_LEVEL_8, LOG_GROUP, "{%p} " LOG_FN_FMT ": %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log8ThisFunc(a) do { Log8(("{%p} " LOG_FN_FMT ": ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log8(a); } while (0)
+#endif
+
+/** @def Log9ThisFunc
+ * Level 9 logging inside a C++ non-static method, with object pointer and
+ * method name prefixed to the given message.
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log9ThisFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_LEVEL_9, LOG_GROUP, "{%p} " LOG_FN_FMT ": %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log9ThisFunc(a) do { Log9(("{%p} " LOG_FN_FMT ": ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log9(a); } while (0)
+#endif
+
+/** @def Log10ThisFunc
+ * Level 10 logging inside a C++ non-static method, with object pointer and
+ * method name prefixed to the given message.
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log10ThisFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_LEVEL_10, LOG_GROUP, "{%p} " LOG_FN_FMT ": %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log10ThisFunc(a) do { Log10(("{%p} " LOG_FN_FMT ": ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log10(a); } while (0)
+#endif
+
+/** @def Log11ThisFunc
+ * Level 11 logging inside a C++ non-static method, with object pointer and
+ * method name prefixed to the given message.
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log11ThisFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_LEVEL_11, LOG_GROUP, "{%p} " LOG_FN_FMT ": %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log11ThisFunc(a) do { Log11(("{%p} " LOG_FN_FMT ": ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log11(a); } while (0)
+#endif
+
+/** @def Log12ThisFunc
+ * Level 12 logging inside a C++ non-static method, with object pointer and
+ * method name prefixed to the given message.
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log12ThisFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_LEVEL_12, LOG_GROUP, "{%p} " LOG_FN_FMT ": %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log12ThisFunc(a) do { Log12(("{%p} " LOG_FN_FMT ": ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log12(a); } while (0)
+#endif
+
+/** @def LogFlowThisFunc
+ * Flow level logging inside a C++ non-static method, with object pointer and
+ * method name prefixed to the given message.
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define LogFlowThisFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_FLOW, LOG_GROUP, "{%p} " LOG_FN_FMT ": %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define LogFlowThisFunc(a) do { LogFlow(("{%p} " LOG_FN_FMT ": ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); LogFlow(a); } while (0)
+#endif
+
+/** @def LogWarnThisFunc
+ * Warning level logging inside a C++ non-static method, with object pointer and
+ * method name prefixed to the given message.
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define LogWarnThisFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_WARN, LOG_GROUP, "{%p} " LOG_FN_FMT ": %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define LogWarnThisFunc(a) do { LogWarn(("{%p} " LOG_FN_FMT ": ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); LogWarn(a); } while (0)
+#endif
+/** @} */
+
+
+/** @name Misc Logging Macros
+ * @{ */
+
+/** @def Log1Warning
+ * The same as Log(), but prepents a <tt>"WARNING! "</tt> string to the message.
+ *
+ * @param   a   Custom log message in format <tt>("string\n" [, args])</tt>.
+ */
+#if defined(LOG_USE_C99)
+# define Log1Warning(a)     _LogIt(RTLOGGRPFLAGS_LEVEL_1, LOG_GROUP, "WARNING! %M", _LogRemoveParentheseis a )
+#else
+# define Log1Warning(a)     do { Log(("WARNING! ")); Log(a); } while (0)
+#endif
+
+/** @def Log1WarningFunc
+ * The same as LogWarning(), but prepents the log message with the function name.
+ *
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log1WarningFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_LEVEL_1, LOG_GROUP, LOG_FN_FMT ": WARNING! %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log1WarningFunc(a) \
+    do { Log((LOG_FN_FMT ": WARNING! ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log(a); } while (0)
+#endif
+
+/** @def Log1WarningThisFunc
+ * The same as LogWarningFunc() but for class functions (methods): the resulting
+ * log line is additionally prepended with a hex value of |this| pointer.
+ *
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define Log1WarningThisFunc(a) \
+    _LogIt(RTLOGGRPFLAGS_LEVEL_1, LOG_GROUP, "{%p} " LOG_FN_FMT ": WARNING! %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define Log1WarningThisFunc(a) \
+    do { Log(("{%p} " LOG_FN_FMT ": WARNING! ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); Log(a); } while (0)
+#endif
+
+
+/** Shortcut to |LogFlowFunc ("ENTER\n")|, marks the beginnig of the function. */
+#define LogFlowFuncEnter()      LogFlowFunc(("ENTER\n"))
+
+/** Shortcut to |LogFlowFunc ("LEAVE\n")|, marks the end of the function. */
+#define LogFlowFuncLeave()      LogFlowFunc(("LEAVE\n"))
+
+/** Shortcut to |LogFlowFunc ("LEAVE: %Rrc\n")|, marks the end of the function. */
+#define LogFlowFuncLeaveRC(rc)  LogFlowFunc(("LEAVE: %Rrc\n", (rc)))
+
+/** Shortcut to |LogFlowThisFunc ("ENTER\n")|, marks the beginnig of the function. */
+#define LogFlowThisFuncEnter()  LogFlowThisFunc(("ENTER\n"))
+
+/** Shortcut to |LogFlowThisFunc ("LEAVE\n")|, marks the end of the function. */
+#define LogFlowThisFuncLeave()  LogFlowThisFunc(("LEAVE\n"))
+
+
+/** @def LogObjRefCnt
+ * Helper macro to print the current reference count of the given COM object
+ * to the log file.
+ *
+ * @param pObj  Pointer to the object in question (must be a pointer to an
+ *              IUnknown subclass or simply define COM-style AddRef() and
+ *              Release() methods)
+ */
+#define LogObjRefCnt(pObj) \
+    do { \
+        if (LogIsFlowEnabled()) \
+        { \
+            int cRefsForLog = (pObj)->AddRef(); \
+            LogFlow((#pObj "{%p}.refCnt=%d\n", (pObj), cRefsForLog - 1)); \
+            (pObj)->Release(); \
+        } \
+    } while (0)
+/** @} */
+
+
+
+/** @name Passing Function Call Position When Logging.
+ *
+ * This is a little bit ugly as we have to omit the comma before the
+ * position parameters so that we don't inccur any overhead in non-logging
+ * builds (!defined(LOG_ENABLED).
+ *
+ * @{  */
+/** Source position for passing to a function call. */
+#ifdef LOG_ENABLED
+# define RTLOG_COMMA_SRC_POS        , __FILE__, __LINE__, RT_GCC_EXTENSION __PRETTY_FUNCTION__
+#else
+# define RTLOG_COMMA_SRC_POS        RT_NOTHING
+#endif
+/** Source position declaration. */
+#ifdef LOG_ENABLED
+# define RTLOG_COMMA_SRC_POS_DECL   , const char *pszFile, unsigned iLine, const char *pszFunction
+#else
+# define RTLOG_COMMA_SRC_POS_DECL   RT_NOTHING
+#endif
+/** Source position arguments. */
+#ifdef LOG_ENABLED
+# define RTLOG_COMMA_SRC_POS_ARGS   , pszFile, iLine, pszFunction
+#else
+# define RTLOG_COMMA_SRC_POS_ARGS   RT_NOTHING
+#endif
+/** Applies NOREF() to the source position arguments. */
+#ifdef LOG_ENABLED
+# define RTLOG_SRC_POS_NOREF()      do { NOREF(pszFile); NOREF(iLine); NOREF(pszFunction); } while (0)
+#else
+# define RTLOG_SRC_POS_NOREF()      do { } while (0)
+#endif
+/** @}  */
+
+
+
+/** @defgroup grp_rt_log_rel    Release Logging
+ * @{
+ */
+
+#ifdef DOXYGEN_RUNNING
+# define RTLOG_REL_DISABLED
+# define RTLOG_REL_ENABLED
+#endif
+
+/** @def RTLOG_REL_DISABLED
+ * Use this compile time define to disable all release logging
+ * macros.
+ */
+
+/** @def RTLOG_REL_ENABLED
+ * Use this compile time define to override RTLOG_REL_DISABLE.
+ */
+
+/*
+ * Determine whether release logging is enabled and forcefully normalize the indicators.
+ */
+#if !defined(RTLOG_REL_DISABLED) || defined(RTLOG_REL_ENABLED)
+# undef  RTLOG_REL_DISABLED
+# undef  RTLOG_REL_ENABLED
+# define RTLOG_REL_ENABLED
+#else
+# undef  RTLOG_REL_ENABLED
+# undef  RTLOG_REL_DISABLED
+# define RTLOG_REL_DISABLED
+#endif
+
+/** @name Macros for checking whether a release log level is enabled.
+ * @{ */
+/** @def LogRelIsItEnabled
+ * Checks whether the specified release logging group is enabled or not.
+ */
+#define LogRelIsItEnabled(a_fFlags, a_iGroup) ( RTLogRelGetDefaultInstanceExWeak(RT_MAKE_U32(a_fFlags, a_iGroup)) != NULL )
+
+/** @def LogRelIsEnabled
+ * Checks whether level 1 release logging is enabled.
+ */
+#define LogRelIsEnabled()      LogRelIsItEnabled(RTLOGGRPFLAGS_LEVEL_1, LOG_GROUP)
+
+/** @def LogRelIs2Enabled
+ * Checks whether level 2 release logging is enabled.
+ */
+#define LogRelIs2Enabled()     LogRelIsItEnabled(RTLOGGRPFLAGS_LEVEL_2, LOG_GROUP)
+
+/** @def LogRelIs3Enabled
+ * Checks whether level 3 release logging is enabled.
+ */
+#define LogRelIs3Enabled()     LogRelIsItEnabled(RTLOGGRPFLAGS_LEVEL_3, LOG_GROUP)
+
+/** @def LogRelIs4Enabled
+ * Checks whether level 4 release logging is enabled.
+ */
+#define LogRelIs4Enabled()     LogRelIsItEnabled(RTLOGGRPFLAGS_LEVEL_4, LOG_GROUP)
+
+/** @def LogRelIs5Enabled
+ * Checks whether level 5 release logging is enabled.
+ */
+#define LogRelIs5Enabled()     LogRelIsItEnabled(RTLOGGRPFLAGS_LEVEL_5, LOG_GROUP)
+
+/** @def LogRelIs6Enabled
+ * Checks whether level 6 release logging is enabled.
+ */
+#define LogRelIs6Enabled()     LogRelIsItEnabled(RTLOGGRPFLAGS_LEVEL_6, LOG_GROUP)
+
+/** @def LogRelIs7Enabled
+ * Checks whether level 7 release logging is enabled.
+ */
+#define LogRelIs7Enabled()     LogRelIsItEnabled(RTLOGGRPFLAGS_LEVEL_7, LOG_GROUP)
+
+/** @def LogRelIs8Enabled
+ * Checks whether level 8 release logging is enabled.
+ */
+#define LogRelIs8Enabled()     LogRelIsItEnabled(RTLOGGRPFLAGS_LEVEL_8, LOG_GROUP)
+
+/** @def LogRelIs2Enabled
+ * Checks whether level 9 release logging is enabled.
+ */
+#define LogRelIs9Enabled()     LogRelIsItEnabled(RTLOGGRPFLAGS_LEVEL_9, LOG_GROUP)
+
+/** @def LogRelIs10Enabled
+ * Checks whether level 10 release logging is enabled.
+ */
+#define LogRelIs10Enabled()    LogRelIsItEnabled(RTLOGGRPFLAGS_LEVEL_10, LOG_GROUP)
+
+/** @def LogRelIs11Enabled
+ * Checks whether level 10 release logging is enabled.
+ */
+#define LogRelIs11Enabled()    LogRelIsItEnabled(RTLOGGRPFLAGS_LEVEL_11, LOG_GROUP)
+
+/** @def LogRelIs12Enabled
+ * Checks whether level 12 release logging is enabled.
+ */
+#define LogRelIs12Enabled()    LogRelIsItEnabled(RTLOGGRPFLAGS_LEVEL_12, LOG_GROUP)
+
+/** @def LogRelIsFlowEnabled
+ * Checks whether execution flow release logging is enabled.
+ */
+#define LogRelIsFlowEnabled()  LogRelIsItEnabled(RTLOGGRPFLAGS_FLOW, LOG_GROUP)
+
+/** @def LogRelIsWarnEnabled
+ * Checks whether warning level release logging is enabled.
+ */
+#define LogRelIsWarnEnabled()  LogRelIsItEnabled(RTLOGGRPFLAGS_FLOW, LOG_GROUP)
+/** @} */
+
+
+/** @def LogRelIt
+ * Write to specific logger if group enabled.
+ */
+/** @def LogRelItLikely
+ * Write to specific logger if group enabled, assuming it likely it is enabled.
+ */
+/** @def LogRelMaxIt
+ * Write to specific logger if group enabled and at less than a_cMax messages
+ * have hit the log.  Uses a static variable to count.
+ */
+#ifdef RTLOG_REL_ENABLED
+# if defined(LOG_USE_C99)
+#  define _LogRelRemoveParentheseis(...)                    __VA_ARGS__
+#  define _LogRelIt(a_fFlags, a_iGroup, ...) \
+    do \
+    { \
+        PRTLOGGER LogRelIt_pLogger = RTLogRelGetDefaultInstanceExWeak(RT_MAKE_U32(a_fFlags, a_iGroup)); \
+        if (RT_LIKELY(!LogRelIt_pLogger)) \
+        { /* likely */ } \
+        else \
+            RTLogLoggerExWeak(LogRelIt_pLogger, a_fFlags, a_iGroup, __VA_ARGS__); \
+        _LogIt(a_fFlags, a_iGroup, __VA_ARGS__); \
+    } while (0)
+#  define LogRelIt(a_fFlags, a_iGroup, fmtargs) \
+    _LogRelIt(a_fFlags, a_iGroup, _LogRelRemoveParentheseis fmtargs)
+#  define _LogRelItLikely(a_fFlags, a_iGroup, ...) \
+    do \
+    { \
+        PRTLOGGER LogRelIt_pLogger = RTLogRelGetDefaultInstanceExWeak(RT_MAKE_U32(a_fFlags, a_iGroup)); \
+        if (LogRelIt_pLogger) \
+            RTLogLoggerExWeak(LogRelIt_pLogger, a_fFlags, a_iGroup, __VA_ARGS__); \
+        _LogIt(a_fFlags, a_iGroup, __VA_ARGS__); \
+    } while (0)
+#  define LogRelItLikely(a_fFlags, a_iGroup, fmtargs) \
+    _LogRelItLikely(a_fFlags, a_iGroup, _LogRelRemoveParentheseis fmtargs)
+#  define _LogRelMaxIt(a_cMax, a_fFlags, a_iGroup, ...) \
+    do \
+    { \
+        PRTLOGGER LogRelIt_pLogger = RTLogRelGetDefaultInstanceExWeak(RT_MAKE_U32(a_fFlags, a_iGroup)); \
+        if (LogRelIt_pLogger) \
+        { \
+            static uint32_t s_LogRelMaxIt_cLogged = 0; \
+            if (s_LogRelMaxIt_cLogged < (a_cMax)) \
+            { \
+                s_LogRelMaxIt_cLogged++; \
+                RTLogLoggerExWeak(LogRelIt_pLogger, a_fFlags, a_iGroup, __VA_ARGS__); \
+            } \
+        } \
+        _LogIt(a_fFlags, a_iGroup, __VA_ARGS__); \
+    } while (0)
+#  define LogRelMaxIt(a_cMax, a_fFlags, a_iGroup, fmtargs) \
+    _LogRelMaxIt(a_cMax, a_fFlags, a_iGroup, _LogRelRemoveParentheseis fmtargs)
+# else
+#  define LogRelItLikely(a_fFlags, a_iGroup, fmtargs) \
+   do \
+   { \
+       PRTLOGGER LogRelIt_pLogger = RTLogRelGetDefaultInstanceExWeak(RT_MAKE_U32(a_fFlags, a_iGroup)); \
+       if (LogRelIt_pLogger) \
+       { \
+           LogRelIt_pLogger->pfnLogger fmtargs; \
+       } \
+       LogIt(a_fFlags, a_iGroup, fmtargs); \
+  } while (0)
+#  define LogRelIt(a_fFlags, a_iGroup, fmtargs) \
+   do \
+   { \
+       PRTLOGGER LogRelIt_pLogger = RTLogRelGetDefaultInstanceExWeak(RT_MAKE_U32(a_fFlags, a_iGroup)); \
+       if (RT_LIKELY(!LogRelIt_pLogger)) \
+       { /* likely */ } \
+       else \
+       { \
+           LogRelIt_pLogger->pfnLogger fmtargs; \
+       } \
+       LogIt(a_fFlags, a_iGroup, fmtargs); \
+  } while (0)
+#  define LogRelMaxIt(a_cMax, a_fFlags, a_iGroup, fmtargs) \
+   do \
+   { \
+       PRTLOGGER LogRelIt_pLogger = RTLogRelGetDefaultInstanceExWeak(RT_MAKE_U32(a_fFlags, a_iGroup)); \
+       if (LogRelIt_pLogger) \
+       { \
+           static uint32_t s_LogRelMaxIt_cLogged = 0; \
+           if (s_LogRelMaxIt_cLogged < (a_cMax)) \
+           { \
+               s_LogRelMaxIt_cLogged++; \
+               LogRelIt_pLogger->pfnLogger fmtargs; \
+           } \
+       } \
+       LogIt(a_fFlags, a_iGroup, fmtargs); \
+  } while (0)
+# endif
+#else   /* !RTLOG_REL_ENABLED */
+# define LogRelIt(a_fFlags, a_iGroup, fmtargs)              do { } while (0)
+# define LogRelItLikely(a_fFlags, a_iGroup, fmtargs)        do { } while (0)
+# define LogRelMaxIt(a_cMax, a_fFlags, a_iGroup, fmtargs)   do { } while (0)
+# if defined(LOG_USE_C99)
+#  define _LogRelRemoveParentheseis(...)                    __VA_ARGS__
+#  define _LogRelIt(a_fFlags, a_iGroup, ...)                do { } while (0)
+#  define _LogRelItLikely(a_fFlags, a_iGroup, ...)          do { } while (0)
+#  define _LogRelMaxIt(a_cMax, a_fFlags, a_iGroup, ...)     do { } while (0)
+# endif
+#endif  /* !RTLOG_REL_ENABLED */
+
+
+/** @name Basic release logging macros
+ * @{ */
+/** @def LogRel
+ * Level 1 release logging.
+ */
+#define LogRel(a)           LogRelItLikely(RTLOGGRPFLAGS_LEVEL_1, LOG_GROUP, a)
+
+/** @def LogRel2
+ * Level 2 release logging.
+ */
+#define LogRel2(a)          LogRelIt(RTLOGGRPFLAGS_LEVEL_2,  LOG_GROUP, a)
+
+/** @def LogRel3
+ * Level 3 release logging.
+ */
+#define LogRel3(a)          LogRelIt(RTLOGGRPFLAGS_LEVEL_3,  LOG_GROUP, a)
+
+/** @def LogRel4
+ * Level 4 release logging.
+ */
+#define LogRel4(a)          LogRelIt(RTLOGGRPFLAGS_LEVEL_4,  LOG_GROUP, a)
+
+/** @def LogRel5
+ * Level 5 release logging.
+ */
+#define LogRel5(a)          LogRelIt(RTLOGGRPFLAGS_LEVEL_5,  LOG_GROUP, a)
+
+/** @def LogRel6
+ * Level 6 release logging.
+ */
+#define LogRel6(a)          LogRelIt(RTLOGGRPFLAGS_LEVEL_6,  LOG_GROUP, a)
+
+/** @def LogRel7
+ * Level 7 release logging.
+ */
+#define LogRel7(a)          LogRelIt(RTLOGGRPFLAGS_LEVEL_7,  LOG_GROUP, a)
+
+/** @def LogRel8
+ * Level 8 release logging.
+ */
+#define LogRel8(a)          LogRelIt(RTLOGGRPFLAGS_LEVEL_8,  LOG_GROUP, a)
+
+/** @def LogRel9
+ * Level 9 release logging.
+ */
+#define LogRel9(a)          LogRelIt(RTLOGGRPFLAGS_LEVEL_9,  LOG_GROUP, a)
+
+/** @def LogRel10
+ * Level 10 release logging.
+ */
+#define LogRel10(a)         LogRelIt(RTLOGGRPFLAGS_LEVEL_10, LOG_GROUP, a)
+
+/** @def LogRel11
+ * Level 11 release logging.
+ */
+#define LogRel11(a)         LogRelIt(RTLOGGRPFLAGS_LEVEL_11, LOG_GROUP, a)
+
+/** @def LogRel12
+ * Level 12 release logging.
+ */
+#define LogRel12(a)         LogRelIt(RTLOGGRPFLAGS_LEVEL_12, LOG_GROUP, a)
+
+/** @def LogRelFlow
+ * Logging of execution flow.
+ */
+#define LogRelFlow(a)       LogRelIt(RTLOGGRPFLAGS_FLOW,     LOG_GROUP, a)
+
+/** @def LogRelWarn
+ * Warning level release logging.
+ */
+#define LogRelWarn(a)       LogRelIt(RTLOGGRPFLAGS_WARN,     LOG_GROUP, a)
+/** @} */
+
+
+
+/** @name Basic release logging macros with local max
+ * @{ */
+/** @def LogRelMax
+ * Level 1 release logging with a max number of log entries.
+ */
+#define LogRelMax(a_cMax, a)        LogRelMaxIt(a_cMax, RTLOGGRPFLAGS_LEVEL_1, LOG_GROUP, a)
+
+/** @def LogRelMax2
+ * Level 2 release logging with a max number of log entries.
+ */
+#define LogRelMax2(a_cMax, a)       LogRelMaxIt(a_cMax, RTLOGGRPFLAGS_LEVEL_2,  LOG_GROUP, a)
+
+/** @def LogRelMax3
+ * Level 3 release logging with a max number of log entries.
+ */
+#define LogRelMax3(a_cMax, a)       LogRelMaxIt(a_cMax, RTLOGGRPFLAGS_LEVEL_3,  LOG_GROUP, a)
+
+/** @def LogRelMax4
+ * Level 4 release logging with a max number of log entries.
+ */
+#define LogRelMax4(a_cMax, a)       LogRelMaxIt(a_cMax, RTLOGGRPFLAGS_LEVEL_4,  LOG_GROUP, a)
+
+/** @def LogRelMax5
+ * Level 5 release logging with a max number of log entries.
+ */
+#define LogRelMax5(a_cMax, a)       LogRelMaxIt(a_cMax, RTLOGGRPFLAGS_LEVEL_5,  LOG_GROUP, a)
+
+/** @def LogRelMax6
+ * Level 6 release logging with a max number of log entries.
+ */
+#define LogRelMax6(a_cMax, a)       LogRelMaxIt(a_cMax, RTLOGGRPFLAGS_LEVEL_6,  LOG_GROUP, a)
+
+/** @def LogRelMax7
+ * Level 7 release logging with a max number of log entries.
+ */
+#define LogRelMax7(a_cMax, a)       LogRelMaxIt(a_cMax, RTLOGGRPFLAGS_LEVEL_7,  LOG_GROUP, a)
+
+/** @def LogRelMax8
+ * Level 8 release logging with a max number of log entries.
+ */
+#define LogRelMax8(a_cMax, a)       LogRelMaxIt(a_cMax, RTLOGGRPFLAGS_LEVEL_8,  LOG_GROUP, a)
+
+/** @def LogRelMax9
+ * Level 9 release logging with a max number of log entries.
+ */
+#define LogRelMax9(a_cMax, a)       LogRelMaxIt(a_cMax, RTLOGGRPFLAGS_LEVEL_9,  LOG_GROUP, a)
+
+/** @def LogRelMax10
+ * Level 10 release logging with a max number of log entries.
+ */
+#define LogRelMax10(a_cMax, a)      LogRelMaxIt(a_cMax, RTLOGGRPFLAGS_LEVEL_10, LOG_GROUP, a)
+
+/** @def LogRelMax11
+ * Level 11 release logging with a max number of log entries.
+ */
+#define LogRelMax11(a_cMax, a)      LogRelMaxIt(a_cMax, RTLOGGRPFLAGS_LEVEL_11, LOG_GROUP, a)
+
+/** @def LogRelMax12
+ * Level 12 release logging with a max number of log entries.
+ */
+#define LogRelMax12(a_cMax, a)      LogRelMaxIt(a_cMax, RTLOGGRPFLAGS_LEVEL_12, LOG_GROUP, a)
+
+/** @def LogRelMaxFlow
+ * Logging of execution flow with a max number of log entries.
+ */
+#define LogRelMaxFlow(a_cMax, a)    LogRelMaxIt(a_cMax, RTLOGGRPFLAGS_FLOW,     LOG_GROUP, a)
+/** @} */
+
+
+/** @name Release logging macros prefixing the current function name.
+ * @{ */
+
+/** @def LogRelFunc
+ * Release logging.  Prepends the given log message with the function name
+ * followed by a semicolon and space.
+ */
+#ifdef LOG_USE_C99
+# define LogRelFunc(a) \
+    _LogRelItLikely(RTLOGGRPFLAGS_LEVEL_1, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define LogRelFunc(a)      do { LogRel((LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); LogRel(a); } while (0)
+#endif
+
+/** @def LogRelFlowFunc
+ * Release logging.  Macro to log the execution flow inside C/C++ functions.
+ *
+ * Prepends the given log message with the function name followed by
+ * a semicolon and space.
+ *
+ * @param   a   Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define LogRelFlowFunc(a)  _LogRelIt(RTLOGGRPFLAGS_FLOW, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define LogRelFlowFunc(a)  do { LogRelFlow((LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); LogRelFlow(a); } while (0)
+#endif
+
+/** @def LogRelMaxFunc
+ * Release logging.  Prepends the given log message with the function name
+ * followed by a semicolon and space.
+ */
+#ifdef LOG_USE_C99
+# define LogRelMaxFunc(a_cMax, a) \
+    _LogRelMaxIt(a_cMax, RTLOGGRPFLAGS_LEVEL_1, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define LogRelMaxFunc(a_cMax, a) \
+    do { LogRelMax(a_cMax, (LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); LogRelMax(a_cMax, a); } while (0)
+#endif
+
+/** @def LogRelMaxFlowFunc
+ * Release logging.  Macro to log the execution flow inside C/C++ functions.
+ *
+ * Prepends the given log message with the function name followed by
+ * a semicolon and space.
+ *
+ * @param   a_cMax  Max number of times this should hit the log.
+ * @param   a       Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define LogRelMaxFlowFunc(a_cMax, a) \
+    _LogRelMaxIt(a_cMax, RTLOGGRPFLAGS_FLOW, LOG_GROUP, LOG_FN_FMT ": %M", RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define LogRelMaxFlowFunc(a_cMax, a) \
+    do { LogRelMaxFlow(a_cMax, (LOG_FN_FMT ": ", RT_GCC_EXTENSION __PRETTY_FUNCTION__)); LogRelFlow(a_cMax, a); } while (0)
+#endif
+
+/** @} */
+
+
+/** @name Release Logging macros prefixing the this pointer value and method name.
+ * @{ */
+
+/** @def LogRelThisFunc
+ * The same as LogRelFunc but for class functions (methods): the resulting log
+ * line is additionally prepended with a hex value of |this| pointer.
+ */
+#ifdef LOG_USE_C99
+# define LogRelThisFunc(a) \
+    _LogRelItLikely(RTLOGGRPFLAGS_LEVEL_1, LOG_GROUP, "{%p} " LOG_FN_FMT ": %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define LogRelThisFunc(a) \
+    do { LogRel(("{%p} " LOG_FN_FMT ": ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); LogRel(a); } while (0)
+#endif
+
+/** @def LogRelMaxThisFunc
+ * The same as LogRelFunc but for class functions (methods): the resulting log
+ * line is additionally prepended with a hex value of |this| pointer.
+ * @param   a_cMax  Max number of times this should hit the log.
+ * @param   a       Log message in format <tt>("string\n" [, args])</tt>.
+ */
+#ifdef LOG_USE_C99
+# define LogRelMaxThisFunc(a_cMax, a) \
+    _LogRelMaxIt(a_cMax, RTLOGGRPFLAGS_LEVEL_1, LOG_GROUP, "{%p} " LOG_FN_FMT ": %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define LogRelMaxThisFunc(a_cMax, a) \
+    do { LogRelMax(a_cMax, ("{%p} " LOG_FN_FMT ": ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); LogRelMax(a_cMax, a); } while (0)
+#endif
+
+/** @def LogRelFlowThisFunc
+ * The same as LogRelFlowFunc but for class functions (methods): the resulting
+ * log line is additionally prepended with a hex value of |this| pointer.
+ */
+#ifdef LOG_USE_C99
+# define LogRelFlowThisFunc(a) \
+    _LogRelIt(RTLOGGRPFLAGS_FLOW, LOG_GROUP, "{%p} " LOG_FN_FMT ": %M", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__, _LogRemoveParentheseis a )
+#else
+# define LogRelFlowThisFunc(a) do { LogRelFlow(("{%p} " LOG_FN_FMT ": ", this, RT_GCC_EXTENSION __PRETTY_FUNCTION__)); LogRelFlow(a); } while (0)
+#endif
+
+
+/** Shortcut to |LogRelFlowFunc ("ENTER\n")|, marks the beginnig of the function. */
+#define LogRelFlowFuncEnter()      LogRelFlowFunc(("ENTER\n"))
+
+/** Shortcut to |LogRelFlowFunc ("LEAVE\n")|, marks the end of the function. */
+#define LogRelFlowFuncLeave()      LogRelFlowFunc(("LEAVE\n"))
+
+/** Shortcut to |LogRelFlowFunc ("LEAVE: %Rrc\n")|, marks the end of the function. */
+#define LogRelFlowFuncLeaveRC(rc)  LogRelFlowFunc(("LEAVE: %Rrc\n", (rc)))
+
+/** Shortcut to |LogRelFlowThisFunc ("ENTER\n")|, marks the beginnig of the function. */
+#define LogRelFlowThisFuncEnter()  LogRelFlowThisFunc(("ENTER\n"))
+
+/** Shortcut to |LogRelFlowThisFunc ("LEAVE\n")|, marks the end of the function. */
+#define LogRelFlowThisFuncLeave()  LogRelFlowThisFunc(("LEAVE\n"))
+
+/** @} */
+
+
+/**
+ * Sets the default release logger instance.
+ *
+ * @returns The old default instance.
+ * @param   pLogger     The new default release logger instance.
+ */
+RTDECL(PRTLOGGER) RTLogRelSetDefaultInstance(PRTLOGGER pLogger);
+
+/**
+ * Gets the default release logger instance.
+ *
+ * @returns Pointer to default release logger instance if availble, otherwise NULL.
+ */
+RTDECL(PRTLOGGER) RTLogRelGetDefaultInstance(void);
+
+/** @copydoc RTLogRelGetDefaultInstance   */
+typedef DECLCALLBACKTYPE(PRTLOGGER, FNLOGRELGETDEFAULTINSTANCE,(void));
+/** Pointer to RTLogRelGetDefaultInstance. */
+typedef FNLOGRELGETDEFAULTINSTANCE *PFNLOGRELGETDEFAULTINSTANCE;
+
+/** "Weak symbol" emulation for RTLogRelGetDefaultInstance.
+ * @note This is first set when RTLogRelSetDefaultInstance is called. */
+extern RTDATADECL(PFNLOGRELGETDEFAULTINSTANCE) g_pfnRTLogRelGetDefaultInstance;
+
+/** "Weak symbol" wrapper for RTLogRelGetDefaultInstance. */
+DECL_FORCE_INLINE(PRTLOGGER) RTLogRelGetDefaultInstanceWeak(void)
+{
+#if defined(IN_RING3) && (defined(IN_RT_STATIC) || defined(IPRT_NO_CRT))
+    if (g_pfnRTLogRelGetDefaultInstance)
+        return g_pfnRTLogRelGetDefaultInstance();
+    return NULL;
+#else
+    return RTLogRelGetDefaultInstance();
+#endif
+}
+
+/**
+ * Gets the default release logger instance.
+ *
+ * @returns Pointer to default release logger instance if availble, otherwise NULL.
+ * @param   fFlagsAndGroup  The flags in the lower 16 bits, the group number in
+ *                          the high 16 bits.
+ */
+RTDECL(PRTLOGGER) RTLogRelGetDefaultInstanceEx(uint32_t fFlagsAndGroup);
+
+/** @copydoc RTLogRelGetDefaultInstanceEx   */
+typedef DECLCALLBACKTYPE(PRTLOGGER, FNLOGRELGETDEFAULTINSTANCEEX,(uint32_t fFlagsAndGroup));
+/** Pointer to RTLogRelGetDefaultInstanceEx. */
+typedef FNLOGRELGETDEFAULTINSTANCEEX *PFNLOGRELGETDEFAULTINSTANCEEX;
+
+/** "Weak symbol" emulation for RTLogRelGetDefaultInstanceEx.
+ * @note This is first set when RTLogRelSetDefaultInstance is called. */
+extern RTDATADECL(PFNLOGRELGETDEFAULTINSTANCEEX) g_pfnRTLogRelGetDefaultInstanceEx;
+
+/** "Weak symbol" wrapper for RTLogRelGetDefaultInstanceEx. */
+DECL_FORCE_INLINE(PRTLOGGER) RTLogRelGetDefaultInstanceExWeak(uint32_t fFlagsAndGroup)
+{
+#if defined(IN_RING3) && (defined(IN_RT_STATIC) || defined(IPRT_NO_CRT))
+    if (g_pfnRTLogRelGetDefaultInstanceEx)
+        return g_pfnRTLogRelGetDefaultInstanceEx(fFlagsAndGroup);
+    return NULL;
+#else
+    return RTLogRelGetDefaultInstanceEx(fFlagsAndGroup);
+#endif
+}
+
+
+/**
+ * Write to a logger instance, defaulting to the release one.
+ *
+ * This function will check whether the instance, group and flags makes up a
+ * logging kind which is currently enabled before writing anything to the log.
+ *
+ * @param   pLogger     Pointer to logger instance.
+ * @param   fFlags      The logging flags.
+ * @param   iGroup      The group.
+ *                      The value ~0U is reserved for compatibility with RTLogLogger[V] and is
+ *                      only for internal usage!
+ * @param   pszFormat   Format string.
+ * @param   ...         Format arguments.
+ * @remark  This is a worker function for LogRelIt.
+ */
+RTDECL(void) RTLogRelLogger(PRTLOGGER pLogger, unsigned fFlags, unsigned iGroup,
+                            const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(4, 5);
+
+/**
+ * Write to a logger instance, defaulting to the release one.
+ *
+ * This function will check whether the instance, group and flags makes up a
+ * logging kind which is currently enabled before writing anything to the log.
+ *
+ * @param   pLogger     Pointer to logger instance. If NULL the default release instance is attempted.
+ * @param   fFlags      The logging flags.
+ * @param   iGroup      The group.
+ *                      The value ~0U is reserved for compatibility with RTLogLogger[V] and is
+ *                      only for internal usage!
+ * @param   pszFormat   Format string.
+ * @param   args        Format arguments.
+ */
+RTDECL(void) RTLogRelLoggerV(PRTLOGGER pLogger, unsigned fFlags, unsigned iGroup,
+                             const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(4, 0);
+
+/**
+ * printf like function for writing to the default release log.
+ *
+ * @param   pszFormat   Printf like format string.
+ * @param   ...         Optional arguments as specified in pszFormat.
+ *
+ * @remark The API doesn't support formatting of floating point numbers at the moment.
+ */
+RTDECL(void) RTLogRelPrintf(const char *pszFormat, ...)  RT_IPRT_FORMAT_ATTR(1, 2);
+
+/**
+ * vprintf like function for writing to the default release log.
+ *
+ * @param   pszFormat   Printf like format string.
+ * @param   args        Optional arguments as specified in pszFormat.
+ *
+ * @remark The API doesn't support formatting of floating point numbers at the moment.
+ */
+RTDECL(void) RTLogRelPrintfV(const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(1, 0);
+
+/**
+ * Changes the buffering setting of the default release logger.
+ *
+ * This can be used for optimizing longish logging sequences.
+ *
+ * @returns The old state.
+ * @param   fBuffered       The new state.
+ */
+RTDECL(bool) RTLogRelSetBuffering(bool fBuffered);
+
+/** @} */
+
+
+
+/** @name COM port logging
+ * @{
+ */
+
+#ifdef DOXYGEN_RUNNING
+# define LOG_TO_COM
+# define LOG_NO_COM
+#endif
+
+/** @def LOG_TO_COM
+ * Redirects the normal logging macros to the serial versions.
+ */
+
+/** @def LOG_NO_COM
+ * Disables all LogCom* macros.
+ */
+
+/** @def LogCom
+ * Generic logging to serial port.
+ */
+#if defined(LOG_ENABLED) && !defined(LOG_NO_COM)
+# define LogCom(a) RTLogComPrintf a
+#else
+# define LogCom(a) do { } while (0)
+#endif
+
+/** @def LogComFlow
+ * Logging to serial port of execution flow.
+ */
+#if defined(LOG_ENABLED) && defined(LOG_ENABLE_FLOW) && !defined(LOG_NO_COM)
+# define LogComFlow(a) RTLogComPrintf a
+#else
+# define LogComFlow(a) do { } while (0)
+#endif
+
+#ifdef LOG_TO_COM
+# undef Log
+# define Log(a)             LogCom(a)
+# undef LogFlow
+# define LogFlow(a)         LogComFlow(a)
+#endif
+
+/** @} */
+
+
+/** @name Backdoor Logging
+ * @{
+ */
+
+#ifdef DOXYGEN_RUNNING
+# define LOG_TO_BACKDOOR
+# define LOG_NO_BACKDOOR
+#endif
+
+/** @def LOG_TO_BACKDOOR
+ * Redirects the normal logging macros to the backdoor versions.
+ */
+
+/** @def LOG_NO_BACKDOOR
+ * Disables all LogBackdoor* macros.
+ */
+
+/** @def LogBackdoor
+ * Generic logging to the VBox backdoor via port I/O.
+ */
+#if defined(LOG_ENABLED) && !defined(LOG_NO_BACKDOOR)
+# define LogBackdoor(a)     RTLogBackdoorPrintf a
+#else
+# define LogBackdoor(a)     do { } while (0)
+#endif
+
+/** @def LogBackdoorFlow
+ * Logging of execution flow messages to the backdoor I/O port.
+ */
+#if defined(LOG_ENABLED) && !defined(LOG_NO_BACKDOOR)
+# define LogBackdoorFlow(a) RTLogBackdoorPrintf a
+#else
+# define LogBackdoorFlow(a) do { } while (0)
+#endif
+
+/** @def LogRelBackdoor
+ * Release logging to the VBox backdoor via port I/O.
+ */
+#if !defined(LOG_NO_BACKDOOR)
+# define LogRelBackdoor(a)  RTLogBackdoorPrintf a
+#else
+# define LogRelBackdoor(a)  do { } while (0)
+#endif
+
+#ifdef LOG_TO_BACKDOOR
+# undef Log
+# define Log(a)         LogBackdoor(a)
+# undef LogFlow
+# define LogFlow(a)     LogBackdoorFlow(a)
+# undef LogRel
+# define LogRel(a)      LogRelBackdoor(a)
+# if defined(LOG_USE_C99)
+#  undef _LogIt
+#  define _LogIt(a_fFlags, a_iGroup, ...)  LogBackdoor((__VA_ARGS__))
+# endif
+#endif
+
+/** @} */
+
+
+
+/**
+ * Gets the default logger instance, creating it if necessary.
+ *
+ * @returns Pointer to default logger instance if availble, otherwise NULL.
+ */
+RTDECL(PRTLOGGER)   RTLogDefaultInstance(void);
+
+/**
+ * Gets the logger instance if enabled, creating it if necessary.
+ *
+ * @returns Pointer to default logger instance, if group has the specified
+ *          flags enabled.  Otherwise NULL is returned.
+ * @param   fFlagsAndGroup  The flags in the lower 16 bits, the group number in
+ *                          the high 16 bits.
+ */
+RTDECL(PRTLOGGER)   RTLogDefaultInstanceEx(uint32_t fFlagsAndGroup);
+
+/**
+ * Gets the default logger instance (does not create one).
+ *
+ * @returns Pointer to default logger instance if availble, otherwise NULL.
+ */
+RTDECL(PRTLOGGER)   RTLogGetDefaultInstance(void);
+
+/** @copydoc RTLogGetDefaultInstance   */
+typedef DECLCALLBACKTYPE(PRTLOGGER, FNLOGGETDEFAULTINSTANCE,(void));
+/** Pointer to RTLogGetDefaultInstance. */
+typedef FNLOGGETDEFAULTINSTANCE *PFNLOGGETDEFAULTINSTANCE;
+
+/** "Weak symbol" emulation for RTLogGetDefaultInstance.
+ * @note This is first set when RTLogSetDefaultInstance is called. */
+extern RTDATADECL(PFNLOGGETDEFAULTINSTANCE) g_pfnRTLogGetDefaultInstance;
+
+/** "Weak symbol" wrapper for RTLogGetDefaultInstance. */
+DECL_FORCE_INLINE(PRTLOGGER) RTLogGetDefaultInstanceWeak(void)
+{
+#if defined(IN_RING3) && (defined(IN_RT_STATIC) || defined(IPRT_NO_CRT))
+    if (g_pfnRTLogGetDefaultInstance)
+        return g_pfnRTLogGetDefaultInstance();
+    return NULL;
+#else
+    return RTLogGetDefaultInstance();
+#endif
+}
+
+/**
+ * Gets the default logger instance if enabled (does not create one).
+ *
+ * @returns Pointer to default logger instance, if group has the specified
+ *          flags enabled.  Otherwise NULL is returned.
+ * @param   fFlagsAndGroup  The flags in the lower 16 bits, the group number in
+ *                          the high 16 bits.
+ */
+RTDECL(PRTLOGGER)   RTLogGetDefaultInstanceEx(uint32_t fFlagsAndGroup);
+
+/** @copydoc RTLogGetDefaultInstanceEx   */
+typedef DECLCALLBACKTYPE(PRTLOGGER, FNLOGGETDEFAULTINSTANCEEX,(uint32_t fFlagsAndGroup));
+/** Pointer to RTLogGetDefaultInstanceEx. */
+typedef FNLOGGETDEFAULTINSTANCEEX *PFNLOGGETDEFAULTINSTANCEEX;
+
+/** "Weak symbol" emulation for RTLogGetDefaultInstanceEx.
+ * @note This is first set when RTLogSetDefaultInstance is called. */
+extern RTDATADECL(PFNLOGGETDEFAULTINSTANCEEX) g_pfnRTLogGetDefaultInstanceEx;
+
+/** "Weak symbol" wrapper for RTLogGetDefaultInstanceEx. */
+DECL_FORCE_INLINE(PRTLOGGER) RTLogGetDefaultInstanceExWeak(uint32_t fFlagsAndGroup)
+{
+#if defined(IN_RING3) && (defined(IN_RT_STATIC) || defined(IPRT_NO_CRT))
+    if (g_pfnRTLogGetDefaultInstanceEx)
+        return g_pfnRTLogGetDefaultInstanceEx(fFlagsAndGroup);
+    return NULL;
+#else
+    return RTLogGetDefaultInstanceEx(fFlagsAndGroup);
+#endif
+}
+
+/**
+ * Sets the default logger instance.
+ *
+ * @returns The old default instance.
+ * @param   pLogger     The new default logger instance.
+ */
+RTDECL(PRTLOGGER)   RTLogSetDefaultInstance(PRTLOGGER pLogger);
+
+#ifdef IN_RING0
+/**
+ * Changes the default logger instance for the current thread.
+ *
+ * @returns IPRT status code.
+ * @param   pLogger     The logger instance. Pass NULL for deregistration.
+ * @param   uKey        Associated key for cleanup purposes. If pLogger is NULL,
+ *                      all instances with this key will be deregistered. So in
+ *                      order to only deregister the instance associated with the
+ *                      current thread use 0.
+ */
+RTR0DECL(int)       RTLogSetDefaultInstanceThread(PRTLOGGER pLogger, uintptr_t uKey);
+#endif /* IN_RING0 */
+
+/**
+ * Creates the default logger instance for IPRT users.
+ *
+ * Any user of the logging features will need to implement
+ * this or use the generic dummy.
+ *
+ * @returns Pointer to the logger instance.
+ */
+RTDECL(PRTLOGGER)   RTLogDefaultInit(void);
+
+/**
+ * This is the 2nd half of what RTLogGetDefaultInstanceEx() and
+ * RTLogRelGetDefaultInstanceEx() does.
+ *
+ * @returns If the group has the specified flags enabled @a pLogger will be
+ *          returned returned.  Otherwise NULL is returned.
+ * @param   pLogger         The logger.  NULL is NULL.
+ * @param   fFlagsAndGroup  The flags in the lower 16 bits, the group number in
+ *                          the high 16 bits.
+ */
+RTDECL(PRTLOGGER)   RTLogCheckGroupFlags(PRTLOGGER pLogger, uint32_t fFlagsAndGroup);
+
+/**
+ * Create a logger instance.
+ *
+ * @returns iprt status code.
+ *
+ * @param   ppLogger            Where to store the logger instance.
+ * @param   fFlags              Logger instance flags, a combination of the
+ *                              RTLOGFLAGS_* values.
+ * @param   pszGroupSettings    The initial group settings.
+ * @param   pszEnvVarBase       Base name for the environment variables for
+ *                              this instance.
+ * @param   cGroups             Number of groups in the array.
+ * @param   papszGroups         Pointer to array of groups.  This must stick
+ *                              around for the life of the logger instance.
+ * @param   fDestFlags          The destination flags.  RTLOGDEST_FILE is ORed
+ *                              if pszFilenameFmt specified.
+ * @param   pszFilenameFmt      Log filename format string.  Standard
+ *                              RTStrFormat().
+ * @param   ...                 Format arguments.
+ */
+RTDECL(int) RTLogCreate(PRTLOGGER *ppLogger, uint64_t fFlags, const char *pszGroupSettings,
+                        const char *pszEnvVarBase, unsigned cGroups, const char * const * papszGroups,
+                        uint32_t fDestFlags, const char *pszFilenameFmt, ...) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(8, 9);
+
+/**
+ * Create a logger instance.
+ *
+ * @returns iprt status code.
+ *
+ * @param   ppLogger            Where to store the logger instance.
+ * @param   pszEnvVarBase       Base name for the environment variables for
+ *                              this instance (ring-3 only).
+ * @param   fFlags              Logger instance flags, a combination of the
+ *                              RTLOGFLAGS_* values.
+ * @param   pszGroupSettings    The initial group settings.
+ * @param   cGroups             Number of groups in the array.
+ * @param   papszGroups         Pointer to array of groups.  This must stick
+ *                              around for the life of the logger instance.
+ * @param   cMaxEntriesPerGroup The max number of entries per group.  UINT32_MAX
+ *                              or zero for unlimited.
+ * @param   cBufDescs           Number of buffer descriptors that @a paBufDescs
+ *                              points to. Zero for defaults.
+ * @param   paBufDescs          Buffer descriptors, optional.
+ * @param   fDestFlags          The destination flags.  RTLOGDEST_FILE is ORed
+ *                              if pszFilenameFmt specified.
+ * @param   pfnPhase            Callback function for starting logging and for
+ *                              ending or starting a new file for log history
+ *                              rotation.  NULL is OK.
+ * @param   cHistory            Number of old log files to keep when performing
+ *                              log history rotation.  0 means no history.
+ * @param   cbHistoryFileMax    Maximum size of log file when performing
+ *                              history rotation. 0 means no size limit.
+ * @param   cSecsHistoryTimeSlot Maximum time interval per log file when
+ *                              performing history rotation, in seconds.
+ *                              0 means time limit.
+ * @param   pOutputIf           The optional file output interface, can be NULL which will
+ *                              make use of the default one.
+ * @param   pvOutputIfUser      The opaque user data to pass to the callbacks in the output interface.
+ * @param   pErrInfo            Where to return extended error information.
+ *                              Optional.
+ * @param   pszFilenameFmt      Log filename format string. Standard RTStrFormat().
+ * @param   ...                 Format arguments.
+ */
+RTDECL(int) RTLogCreateEx(PRTLOGGER *ppLogger, const char *pszEnvVarBase, uint64_t fFlags, const char *pszGroupSettings,
+                          unsigned cGroups, const char * const *papszGroups, uint32_t cMaxEntriesPerGroup,
+                          uint32_t cBufDescs, PRTLOGBUFFERDESC paBufDescs, uint32_t fDestFlags,
+                          PFNRTLOGPHASE pfnPhase, uint32_t cHistory, uint64_t cbHistoryFileMax, uint32_t cSecsHistoryTimeSlot,
+                          PCRTLOGOUTPUTIF pOutputIf, void *pvOutputIfUser,
+                          PRTERRINFO pErrInfo, const char *pszFilenameFmt, ...) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(18, 19);
+
+/**
+ * Create a logger instance.
+ *
+ * @returns iprt status code.
+ *
+ * @param   ppLogger            Where to store the logger instance.
+ * @param   pszEnvVarBase       Base name for the environment variables for
+ *                              this instance (ring-3 only).
+ * @param   fFlags              Logger instance flags, a combination of the
+ *                              RTLOGFLAGS_* values.
+ * @param   pszGroupSettings    The initial group settings.
+ * @param   cGroups             Number of groups in the array.
+ * @param   papszGroups         Pointer to array of groups.  This must stick
+ *                              around for the life of the logger instance.
+ * @param   cMaxEntriesPerGroup The max number of entries per group.  UINT32_MAX
+ *                              or zero for unlimited.
+ * @param   cBufDescs           Number of buffer descriptors that @a paBufDescs
+ *                              points to. Zero for defaults.
+ * @param   paBufDescs          Buffer descriptors, optional.
+ * @param   fDestFlags          The destination flags.  RTLOGDEST_FILE is ORed
+ *                              if pszFilenameFmt specified.
+ * @param   pfnPhase            Callback function for starting logging and for
+ *                              ending or starting a new file for log history
+ *                              rotation.
+ * @param   cHistory            Number of old log files to keep when performing
+ *                              log history rotation.  0 means no history.
+ * @param   cbHistoryFileMax    Maximum size of log file when performing
+ *                              history rotation.  0 means no size limit.
+ * @param   cSecsHistoryTimeSlot  Maximum time interval per log file when
+ *                              performing history rotation, in seconds.
+ *                              0 means no time limit.
+ * @param   pOutputIf           The optional file output interface, can be NULL which will
+ *                              make use of the default one.
+ * @param   pvOutputIfUser      The opaque user data to pass to the callbacks in the output interface.
+ * @param   pErrInfo            Where to return extended error information.
+ *                              Optional.
+ * @param   pszFilenameFmt      Log filename format string.  Standard
+ *                              RTStrFormat().
+ * @param   va                  Format arguments.
+ */
+RTDECL(int) RTLogCreateExV(PRTLOGGER *ppLogger, const char *pszEnvVarBase, uint64_t fFlags, const char *pszGroupSettings,
+                           uint32_t cGroups, const char * const *papszGroups, uint32_t cMaxEntriesPerGroup,
+                           uint32_t cBufDescs, PRTLOGBUFFERDESC paBufDescs, uint32_t fDestFlags,
+                           PFNRTLOGPHASE pfnPhase, uint32_t cHistory, uint64_t cbHistoryFileMax, uint32_t cSecsHistoryTimeSlot,
+                           PCRTLOGOUTPUTIF pOutputIf, void *pvOutputIfUser,
+                           PRTERRINFO pErrInfo, const char *pszFilenameFmt, va_list va) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(18, 0);
+
+/**
+ * Destroys a logger instance.
+ *
+ * The instance is flushed and all output destinations closed (where applicable).
+ *
+ * @returns iprt status code.
+ * @param   pLogger     The logger instance which close destroyed. NULL is fine.
+ */
+RTDECL(int) RTLogDestroy(PRTLOGGER pLogger);
+
+/**
+ * Sets the custom prefix callback.
+ *
+ * @returns IPRT status code.
+ * @param   pLogger     The logger instance.
+ * @param   pfnCallback The callback.
+ * @param   pvUser      The user argument for the callback.
+ *  */
+RTDECL(int) RTLogSetCustomPrefixCallback(PRTLOGGER pLogger, PFNRTLOGPREFIX pfnCallback, void *pvUser);
+
+/**
+ * Sets the custom flush callback.
+ *
+ * This can be handy for special loggers like the per-EMT ones in ring-0,
+ * but also for implementing a log viewer in the debugger GUI.
+ *
+ * @returns IPRT status code.
+ * @retval  VWRN_ALREADY_EXISTS if it was set to a different flusher.
+ * @param   pLogger         The logger instance.
+ * @param   pfnFlush        The flush callback.
+ */
+RTDECL(int) RTLogSetFlushCallback(PRTLOGGER pLogger, PFNRTLOGFLUSH pfnFlush);
+
+/**
+ * Sets the thread name for a thread specific ring-0 logger.
+ *
+ * @returns IPRT status code.
+ * @param   pLogger     The logger. NULL is not allowed.
+ * @param   pszNameFmt  The format string for the thread name.
+ * @param   ...         Format arguments.
+ */
+RTR0DECL(int) RTLogSetR0ThreadNameF(PRTLOGGER pLogger, const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR(2, 3);
+
+/**
+ * Sets the thread name for a thread specific ring-0 logger.
+ *
+ * @returns IPRT status code.
+ * @param   pLogger     The logger. NULL is not allowed.
+ * @param   pszNameFmt  The format string for the thread name.
+ * @param   va          Format arguments.
+ */
+RTR0DECL(int) RTLogSetR0ThreadNameV(PRTLOGGER pLogger, const char *pszNameFmt, va_list va) RT_IPRT_FORMAT_ATTR(2, 0);
+
+/**
+ * Sets the program start time for a thread specific ring-0 logger.
+ *
+ * @returns IPRT status code.
+ * @param   pLogger     The logger. NULL is not allowed.
+ * @param   nsStart     The RTTimeNanoTS() value at program start.
+ */
+RTR0DECL(int) RTLogSetR0ProgramStart(PRTLOGGER pLogger, uint64_t nsStart);
+
+/**
+ * Get the current log group settings as a string.
+ *
+ * @returns VINF_SUCCESS or VERR_BUFFER_OVERFLOW.
+ * @param   pLogger     Logger instance (NULL for default logger).
+ * @param   pszBuf      The output buffer.
+ * @param   cchBuf      The size of the output buffer. Must be greater than
+ *                      zero.
+ */
+RTDECL(int) RTLogQueryGroupSettings(PRTLOGGER pLogger, char *pszBuf, size_t cchBuf);
+
+/**
+ * Updates the group settings for the logger instance using the specified
+ * specification string.
+ *
+ * @returns iprt status code.
+ *          Failures can safely be ignored.
+ * @param   pLogger     Logger instance (NULL for default logger).
+ * @param   pszValue    Value to parse.
+ */
+RTDECL(int) RTLogGroupSettings(PRTLOGGER pLogger, const char *pszValue);
+
+/**
+ * Sets the max number of entries per group.
+ *
+ * @returns Old restriction.
+ *
+ * @param   pLogger             The logger instance (NULL is an alias for the
+ *                              default logger).
+ * @param   cMaxEntriesPerGroup The max number of entries per group.
+ *
+ * @remarks Lowering the limit of an active logger may quietly mute groups.
+ *          Raising it may reactive already muted groups.
+ */
+RTDECL(uint32_t) RTLogSetGroupLimit(PRTLOGGER pLogger, uint32_t cMaxEntriesPerGroup);
+
+/**
+ * Gets the current flag settings for the given logger.
+ *
+ * @returns Logger flags, UINT64_MAX if no logger.
+ * @param   pLogger     Logger instance (NULL for default logger).
+ */
+RTDECL(uint64_t) RTLogGetFlags(PRTLOGGER pLogger);
+
+/**
+ * Modifies the flag settings for the given logger.
+ *
+ * @returns IPRT status code.  Returns VINF_LOG_NO_LOGGER if no default logger
+ *          and @a pLogger is NULL.
+ * @param   pLogger     Logger instance (NULL for default logger).
+ * @param   fSet        Mask of flags to set (OR).
+ * @param   fClear      Mask of flags to clear (NAND).  This is allowed to
+ *                      include invalid flags - e.g. UINT64_MAX is okay.
+ */
+RTDECL(int) RTLogChangeFlags(PRTLOGGER pLogger, uint64_t fSet, uint64_t fClear);
+
+/**
+ * Updates the flags for the logger instance using the specified
+ * specification string.
+ *
+ * @returns iprt status code.
+ *          Failures can safely be ignored.
+ * @param   pLogger     Logger instance (NULL for default logger).
+ * @param   pszValue    Value to parse.
+ */
+RTDECL(int) RTLogFlags(PRTLOGGER pLogger, const char *pszValue);
+
+/**
+ * Changes the buffering setting of the specified logger.
+ *
+ * This can be used for optimizing longish logging sequences.
+ *
+ * @returns The old state.
+ * @param   pLogger     The logger instance (NULL is an alias for the default
+ *                      logger).
+ * @param   fBuffered   The new state.
+ */
+RTDECL(bool) RTLogSetBuffering(PRTLOGGER pLogger, bool fBuffered);
+
+/**
+ * Get the current log flags as a string.
+ *
+ * @returns VINF_SUCCESS or VERR_BUFFER_OVERFLOW.
+ * @param   pLogger     Logger instance (NULL for default logger).
+ * @param   pszBuf      The output buffer.
+ * @param   cchBuf      The size of the output buffer. Must be greater than
+ *                      zero.
+ */
+RTDECL(int) RTLogQueryFlags(PRTLOGGER pLogger, char *pszBuf, size_t cchBuf);
+
+/**
+ * Gets the current destinations flags for the given logger.
+ *
+ * @returns Logger destination flags, UINT32_MAX if no logger.
+ * @param   pLogger     Logger instance (NULL for default logger).
+ */
+RTDECL(uint32_t) RTLogGetDestinations(PRTLOGGER pLogger);
+
+/**
+ * Modifies the log destinations settings for the given logger.
+ *
+ * This is only suitable for simple destination settings that doesn't take
+ * additional arguments, like RTLOGDEST_FILE.
+ *
+ * @returns IPRT status code.  Returns VINF_LOG_NO_LOGGER if no default logger
+ *          and @a pLogger is NULL.
+ * @param   pLogger     Logger instance (NULL for default logger).
+ * @param   fSet        Mask of destinations to set (OR).
+ * @param   fClear      Mask of destinations to clear (NAND).
+ */
+RTDECL(int) RTLogChangeDestinations(PRTLOGGER pLogger, uint32_t fSet, uint32_t fClear);
+
+/**
+ * Updates the logger destination using the specified string.
+ *
+ * @returns VINF_SUCCESS or VERR_BUFFER_OVERFLOW.
+ * @param   pLogger     Logger instance (NULL for default logger).
+ * @param   pszValue    The value to parse.
+ */
+RTDECL(int) RTLogDestinations(PRTLOGGER pLogger, char const *pszValue);
+
+/**
+ * Clear the file delay flag if set, opening the destination and flushing.
+ *
+ * @returns IPRT status code.
+ * @param   pLogger     Logger instance (NULL for default logger).
+ * @param   pErrInfo    Where to return extended error info.  Optional.
+ */
+RTDECL(int) RTLogClearFileDelayFlag(PRTLOGGER pLogger, PRTERRINFO pErrInfo);
+
+/**
+ * Get the current log destinations as a string.
+ *
+ * @returns VINF_SUCCESS or VERR_BUFFER_OVERFLOW.
+ * @param   pLogger     Logger instance (NULL for default logger).
+ * @param   pszBuf      The output buffer.
+ * @param   cchBuf      The size of the output buffer. Must be greater than 0.
+ */
+RTDECL(int) RTLogQueryDestinations(PRTLOGGER pLogger, char *pszBuf, size_t cchBuf);
+
+/**
+ * Performs a bulk update of logger flags and group flags.
+ *
+ * This is for instanced used for copying settings from ring-3 to ring-0
+ * loggers.
+ *
+ * @returns IPRT status code.
+ * @param   pLogger             The logger instance (NULL for default logger).
+ * @param   fFlags              The new logger flags.
+ * @param   uGroupCrc32         The CRC32 of the group name strings.
+ * @param   cGroups             Number of groups.
+ * @param   pafGroups           Array of group flags.
+ * @sa      RTLogQueryBulk
+ */
+RTDECL(int) RTLogBulkUpdate(PRTLOGGER pLogger, uint64_t fFlags, uint32_t uGroupCrc32, uint32_t cGroups, uint32_t const *pafGroups);
+
+/**
+ * Queries data for a bulk update of logger flags and group flags.
+ *
+ * This is for instanced used for copying settings from ring-3 to ring-0
+ * loggers.
+ *
+ * @returns IPRT status code.
+ * @retval  VERR_BUFFER_OVERFLOW if pafGroups is too small, @a pcGroups will be
+ *          set to the actual number of groups.
+ * @param   pLogger             The logger instance (NULL for default logger).
+ * @param   pfFlags             Where to return the logger flags.
+ * @param   puGroupCrc32        Where to return the CRC32 of the group names.
+ * @param   pcGroups            Input: Size of the @a pafGroups allocation.
+ *                              Output: Actual number of groups returned.
+ * @param   pafGroups           Where to return the flags for each group.
+ * @sa      RTLogBulkUpdate
+ */
+RTDECL(int) RTLogQueryBulk(PRTLOGGER pLogger, uint64_t *pfFlags, uint32_t *puGroupCrc32, uint32_t *pcGroups, uint32_t *pafGroups);
+
+/**
+ * Write/copy bulk log data from another logger.
+ *
+ * This is used for transferring stuff from the ring-0 loggers and into the
+ * ring-3 one.  The text goes in as-is w/o any processing (i.e. prefixing or
+ * newline fun).
+ *
+ * @returns IRPT status code.
+ * @param   pLogger             The logger instance (NULL for default logger).
+ * @param   pszBefore           Text to log before the bulk text.  Optional.
+ * @param   pch                 Pointer to the block of bulk log text to write.
+ * @param   cch                 Size of the block of bulk log text to write.
+ * @param   pszAfter            Text to log after the bulk text.  Optional.
+ */
+RTDECL(int) RTLogBulkWrite(PRTLOGGER pLogger, const char *pszBefore, const char *pch, size_t cch, const char *pszAfter);
+
+/**
+ * Write/copy bulk log data from a nested VM logger.
+ *
+ * This is used for
+ *
+ * @returns IRPT status code.
+ * @param   pLogger             The logger instance (NULL for default logger).
+ * @param   pch                 Pointer to the block of bulk log text to write.
+ * @param   cch                 Size of the block of bulk log text to write.
+ * @param   pszInfix            String to put after the line prefixes and the
+ *                              line content.
+ */
+RTDECL(int) RTLogBulkNestedWrite(PRTLOGGER pLogger, const char *pch, size_t cch, const char *pszInfix);
+
+/**
+ * Flushes the specified logger.
+ *
+ * @returns IRPT status code.
+ * @param   pLogger     The logger instance to flush.
+ *                      If NULL the default instance is used. The default instance
+ *                      will not be initialized by this call.
+ */
+RTDECL(int) RTLogFlush(PRTLOGGER pLogger);
+
+/**
+ * Write to a logger instance.
+ *
+ * @param   pLogger     Pointer to logger instance.
+ * @param   pvCallerRet Ignored.
+ * @param   pszFormat   Format string.
+ * @param   ...         Format arguments.
+ */
+RTDECL(void) RTLogLogger(PRTLOGGER pLogger, void *pvCallerRet, const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(3, 4);
+
+/**
+ * Write to a logger instance, weak version.
+ *
+ * @param   pLogger     Pointer to logger instance.
+ * @param   pvCallerRet Ignored.
+ * @param   pszFormat   Format string.
+ * @param   ...         Format arguments.
+ */
+#if defined(IN_RING3) && (defined(IN_RT_STATIC) || defined(IPRT_NO_CRT))
+RTDECL(void) RTLogLoggerWeak(PRTLOGGER pLogger, void *pvCallerRet, const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(3, 4);
+#else /* Cannot use a DECL_FORCE_INLINE because older GCC versions doesn't support inlining va_start. */
+# undef  RTLogLoggerWeak /* in case of mangling */
+# define RTLogLoggerWeak RTLogLogger
+#endif
+
+/**
+ * Write to a logger instance.
+ *
+ * @param   pLogger     Pointer to logger instance.
+ * @param   pszFormat   Format string.
+ * @param   args        Format arguments.
+ */
+RTDECL(void) RTLogLoggerV(PRTLOGGER pLogger, const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(2, 0);
+
+/**
+ * Write to a logger instance.
+ *
+ * This function will check whether the instance, group and flags makes up a
+ * logging kind which is currently enabled before writing anything to the log.
+ *
+ * @param   pLogger     Pointer to logger instance. If NULL the default logger instance will be attempted.
+ * @param   fFlags      The logging flags.
+ * @param   iGroup      The group.
+ *                      The value ~0U is reserved for compatibility with RTLogLogger[V] and is
+ *                      only for internal usage!
+ * @param   pszFormat   Format string.
+ * @param   ...         Format arguments.
+ * @remark  This is a worker function of LogIt.
+ */
+RTDECL(void) RTLogLoggerEx(PRTLOGGER pLogger, unsigned fFlags, unsigned iGroup,
+                           const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(4, 5);
+
+/**
+ * Write to a logger instance, weak version.
+ *
+ * This function will check whether the instance, group and flags makes up a
+ * logging kind which is currently enabled before writing anything to the log.
+ *
+ * @param   pLogger     Pointer to logger instance. If NULL the default logger instance will be attempted.
+ * @param   fFlags      The logging flags.
+ * @param   iGroup      The group.
+ *                      The value ~0U is reserved for compatibility with RTLogLogger[V] and is
+ *                      only for internal usage!
+ * @param   pszFormat   Format string.
+ * @param   ...         Format arguments.
+ * @remark  This is a worker function of LogIt.
+ */
+#if defined(IN_RING3) && (defined(IN_RT_STATIC) || defined(IPRT_NO_CRT))
+RTDECL(void) RTLogLoggerExWeak(PRTLOGGER pLogger, unsigned fFlags, unsigned iGroup,
+                               const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(4, 5);
+#else /* Cannot use a DECL_FORCE_INLINE because older GCC versions doesn't support inlining va_start. */
+# undef  RTLogLoggerExWeak /* in case of mangling */
+# define RTLogLoggerExWeak RTLogLoggerEx
+#endif
+
+/**
+ * Write to a logger instance.
+ *
+ * This function will check whether the instance, group and flags makes up a
+ * logging kind which is currently enabled before writing anything to the log.
+ *
+ * @returns VINF_SUCCESS, VINF_LOG_NO_LOGGER, VINF_LOG_DISABLED, or IPRT error
+ *          status.
+ * @param   pLogger     Pointer to logger instance. If NULL the default logger instance will be attempted.
+ * @param   fFlags      The logging flags.
+ * @param   iGroup      The group.
+ *                      The value ~0U is reserved for compatibility with RTLogLogger[V] and is
+ *                      only for internal usage!
+ * @param   pszFormat   Format string.
+ * @param   args        Format arguments.
+ */
+RTDECL(int) RTLogLoggerExV(PRTLOGGER pLogger, unsigned fFlags, unsigned iGroup,
+                           const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(4, 0);
+
+/** @copydoc RTLogLoggerExV */
+typedef DECLCALLBACKTYPE(int, FNRTLOGLOGGEREXV,(PRTLOGGER pLogger, unsigned fFlags, unsigned iGroup,
+                                                const char *pszFormat, va_list args)) RT_IPRT_FORMAT_ATTR(4, 0);
+/** Pointer to RTLogLoggerExV. */
+typedef FNRTLOGLOGGEREXV *PFNRTLOGLOGGEREXV;
+/** "Weak symbol" emulation for RTLogLoggerExV.
+ * @note This is first set when RTLogCreateEx or RTLogCreate is called. */
+extern RTDATADECL(PFNRTLOGLOGGEREXV)  g_pfnRTLogLoggerExV;
+
+/** "Weak symbol" wrapper for RTLogLoggerExV. */
+DECL_FORCE_INLINE(int) RTLogLoggerExVWeak(PRTLOGGER pLogger, unsigned fFlags, unsigned iGroup,
+                                          const char *pszFormat, va_list args) /* RT_IPRT_FORMAT_ATTR(4, 0) */
+{
+#if defined(IN_RING3) && (defined(IN_RT_STATIC) || defined(IPRT_NO_CRT))
+    if (g_pfnRTLogLoggerExV)
+        return g_pfnRTLogLoggerExV(pLogger, fFlags, iGroup, pszFormat, args);
+    return 22301; /* VINF_LOG_DISABLED, don't want err.h dependency here. */
+#else
+    return RTLogLoggerExV(pLogger, fFlags, iGroup, pszFormat, args);
+#endif
+}
+
+/**
+ * printf like function for writing to the default log.
+ *
+ * @param   pszFormat   Printf like format string.
+ * @param   ...         Optional arguments as specified in pszFormat.
+ *
+ * @remark The API doesn't support formatting of floating point numbers at the moment.
+ */
+RTDECL(void) RTLogPrintf(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
+
+/**
+ * vprintf like function for writing to the default log.
+ *
+ * @param   pszFormat   Printf like format string.
+ * @param   va          Optional arguments as specified in pszFormat.
+ *
+ * @remark The API doesn't support formatting of floating point numbers at the moment.
+ */
+RTDECL(void) RTLogPrintfV(const char *pszFormat, va_list va)  RT_IPRT_FORMAT_ATTR(1, 0);
+
+/**
+ * Dumper vprintf-like function outputting to a logger.
+ *
+ * @param   pvUser      Pointer to the logger instance to use, NULL for default
+ *                      instance.
+ * @param   pszFormat   Format string.
+ * @param   va          Format arguments.
+ */
+RTDECL(void) RTLogDumpPrintfV(void *pvUser, const char *pszFormat, va_list va) RT_IPRT_FORMAT_ATTR(2, 0);
+
+/**
+ * Used for logging assertions, debug and release log as appropriate.
+ *
+ * Implies flushing.
+ *
+ * @param   pszFormat   Format string.
+ * @param   ...         Format arguments.
+ */
+typedef DECLCALLBACKTYPE(void, FNRTLOGASSERTION,(const char *pszFormat, ...)) RT_IPRT_FORMAT_ATTR(1, 2);
+/** Pointer to an assertion logger, ellipsis variant. */
+typedef FNRTLOGASSERTION *PFNRTLOGASSERTION;
+
+/**
+ * Used for logging assertions, debug and release log as appropriate.
+ *
+ * Implies flushing.
+ *
+ * @param   pszFormat   Format string.
+ * @param   va          Format arguments.
+ */
+typedef DECLCALLBACKTYPE(void, FNRTLOGASSERTIONV,(const char *pszFormat, va_list va)) RT_IPRT_FORMAT_ATTR(1, 0);
+/** Pointer to an assertion logger, va_list variant. */
+typedef FNRTLOGASSERTIONV *PFNRTLOGASSERTIONV;
+
+/** @copydoc FNRTLOGASSERTION */
+RTDECL(void) RTLogAssert(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
+/** @copydoc FNRTLOGASSERTIONV */
+RTDECL(void) RTLogAssertV(const char *pszFormat, va_list va) RT_IPRT_FORMAT_ATTR(1, 0);
+
+/** "Weak symbol" emulation for RTLogAssert. */
+extern RTDATADECL(PFNRTLOGASSERTION)  g_pfnRTLogAssert;
+/** "Weak symbol" emulation for RTLogAssertV. */
+extern RTDATADECL(PFNRTLOGASSERTIONV) g_pfnRTLogAssertV;
+
+
+#ifndef DECLARED_FNRTSTROUTPUT          /* duplicated in iprt/string.h & iprt/errcore.h */
+#define DECLARED_FNRTSTROUTPUT
+/**
+ * Output callback.
+ *
+ * @returns number of bytes written.
+ * @param   pvArg       User argument.
+ * @param   pachChars   Pointer to an array of utf-8 characters.
+ * @param   cbChars     Number of bytes in the character array pointed to by pachChars.
+ */
+typedef DECLCALLBACKTYPE(size_t, FNRTSTROUTPUT,(void *pvArg, const char *pachChars, size_t cbChars));
+/** Pointer to callback function. */
+typedef FNRTSTROUTPUT *PFNRTSTROUTPUT;
+#endif
+
+/**
+ * Partial vsprintf worker implementation.
+ *
+ * @returns number of bytes formatted.
+ * @param   pfnOutput   Output worker.
+ *                      Called in two ways. Normally with a string an it's length.
+ *                      For termination, it's called with NULL for string, 0 for length.
+ * @param   pvArg       Argument to output worker.
+ * @param   pszFormat   Format string.
+ * @param   args        Argument list.
+ */
+RTDECL(size_t) RTLogFormatV(PFNRTSTROUTPUT pfnOutput, void *pvArg, const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(3, 0);
+
+/**
+ * Write log buffer to COM port.
+ *
+ * @param   pach        Pointer to the buffer to write.
+ * @param   cb          Number of bytes to write.
+ */
+RTDECL(void) RTLogWriteCom(const char *pach, size_t cb);
+
+/**
+ * Prints a formatted string to the serial port used for logging.
+ *
+ * @returns Number of bytes written.
+ * @param   pszFormat   Format string.
+ * @param   ...         Optional arguments specified in the format string.
+ */
+RTDECL(size_t) RTLogComPrintf(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
+
+/**
+ * Prints a formatted string to the serial port used for logging.
+ *
+ * @returns Number of bytes written.
+ * @param   pszFormat   Format string.
+ * @param   args        Optional arguments specified in the format string.
+ */
+RTDECL(size_t)  RTLogComPrintfV(const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(1, 0);
+
+/**
+ * Write log buffer to a debugger (RTLOGDEST_DEBUGGER).
+ *
+ * @param   pach        What to write.
+ * @param   cb          How much to write.
+ * @remark  When linking statically, this function can be replaced by defining your own.
+ */
+RTDECL(void) RTLogWriteDebugger(const char *pach, size_t cb);
+
+/**
+ * Write log buffer to a user defined output stream (RTLOGDEST_USER).
+ *
+ * @param   pach        What to write.
+ * @param   cb          How much to write.
+ * @remark  When linking statically, this function can be replaced by defining your own.
+ */
+RTDECL(void) RTLogWriteUser(const char *pach, size_t cb);
+
+/**
+ * Write log buffer to a parent VMM (hypervisor).
+ *
+ * @param   pach        What to write.
+ * @param   cb          How much to write.
+ * @param   fRelease    Set if targeting the release log, clear if debug log.
+ *
+ * @note    Currently only available on AMD64 and x86.
+ */
+RTDECL(void) RTLogWriteVmm(const char *pach, size_t cb, bool fRelease);
+
+/**
+ * Write log buffer to stdout (RTLOGDEST_STDOUT).
+ *
+ * @param   pach        What to write.
+ * @param   cb          How much to write.
+ * @remark  When linking statically, this function can be replaced by defining your own.
+ */
+RTDECL(void) RTLogWriteStdOut(const char *pach, size_t cb);
+
+/**
+ * Write log buffer to stdout (RTLOGDEST_STDERR).
+ *
+ * @param   pach        What to write.
+ * @param   cb          How much to write.
+ * @remark  When linking statically, this function can be replaced by defining your own.
+ */
+RTDECL(void) RTLogWriteStdErr(const char *pach, size_t cb);
+
+#ifdef VBOX
+
+/**
+ * Prints a formatted string to the backdoor port.
+ *
+ * @returns Number of bytes written.
+ * @param   pszFormat   Format string.
+ * @param   ...         Optional arguments specified in the format string.
+ */
+RTDECL(size_t) RTLogBackdoorPrintf(const char *pszFormat, ...) RT_IPRT_FORMAT_ATTR(1, 2);
+
+/**
+ * Prints a formatted string to the backdoor port.
+ *
+ * @returns Number of bytes written.
+ * @param   pszFormat   Format string.
+ * @param   args        Optional arguments specified in the format string.
+ */
+RTDECL(size_t)  RTLogBackdoorPrintfV(const char *pszFormat, va_list args) RT_IPRT_FORMAT_ATTR(1, 0);
+
+#endif /* VBOX */
+
+RT_C_DECLS_END
+
+/** @} */
+
+#endif /* !IPRT_INCLUDED_log_h */
+