572 lines
18 KiB
C
572 lines
18 KiB
C
/* **********************************************************
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* Copyright 2007 - 2009 VMware, Inc. All rights reserved.
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* **********************************************************/
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/*
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* @VMKAPIMOD_LICENSE@
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*/
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/*
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***********************************************************************
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* Logging */ /**
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* \defgroup Logging Kernel Logging
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*
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* The logging interfaces provide a means of writing informational
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* and error messages to the kernel's logs.
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*
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* @{
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***********************************************************************
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*/
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#ifndef _VMKAPI_LOGGING_H_
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#define _VMKAPI_LOGGING_H_
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/** \cond never */
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#ifndef VMK_HEADER_INCLUDED_FROM_VMKAPI_H
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#error This vmkapi file should never be included directly but only via vmkapi.h
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#endif
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/** \endcond never */
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#include "base/vmkapi_const.h"
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#include "base/vmkapi_types.h"
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#include "base/vmkapi_status.h"
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#include "base/vmkapi_compiler.h"
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#include <stdarg.h>
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/** \brief Max length of log component name. */
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#define VMK_MAX_LOG_COMPONENT_NAME (32)
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/** \brief Opaque log component handle. */
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typedef struct vmk_LogComponent *vmk_LogComponentHandle;
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/** \brief Log handle guaranteed to be invalid. */
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#define VMK_INVALID_LOG_HANDLE NULL
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/** \brief Log urgency level. */
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typedef enum {
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VMK_LOG_URGENCY_NORMAL,
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VMK_LOG_URGENCY_WARNING,
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VMK_LOG_URGENCY_ALERT
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} vmk_LogUrgency ;
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/** \brief Types of log throttling */
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typedef enum {
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/** Log is not throttled. All messages will be logged. */
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VMK_LOG_THROTTLE_NONE=0,
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/**
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* An internal message count will be kept and messages will
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* only be logged as the count reaches certain wider-spaced values.
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*/
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VMK_LOG_THROTTLE_COUNT=1,
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/**
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* Messages will be logged depending on the return value
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* of a custom log throttling function.
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*/
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VMK_LOG_THROTTLE_CUSTOM=2,
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} vmk_LogThrottleType;
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/*
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***********************************************************************
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* vmk_LogThrottleFunc -- */ /**
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*
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* \ingroup Logging
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* \brief Custom throttling function for a log component.
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*
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* A log throttling function will be called each time an attempt to
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* log a message to a log component is made. If this function returns
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* VMK_TRUE, the message will be logged. Otherwise, the message will
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* not be logged.
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*
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* \param[in] arg Private data argument
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*
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* \return Whether or not the logger should log the current log message.
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* \retval VMK_TRUE Log the current message.
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* \retval VMK_FALSE Do not log the current message.
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*
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***********************************************************************
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*/
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typedef vmk_Bool (*vmk_LogThrottleFunc)(void *arg);
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/**
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* \brief Properties that define the type of throttling for
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* a particular log component.
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*/
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typedef struct vmk_LogThrottleProperties {
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/** Type of log throttling to use. */
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vmk_LogThrottleType type;
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/** Properties for the specified log throttling type. */
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union {
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/** Properties for a custom log throttler. */
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struct {
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/**
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* Throttling function to call on each message submitted to the
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* log component.
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*/
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vmk_LogThrottleFunc throttler;
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/**
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* Private data argument to pass to the log throttling function
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* on each call.
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*/
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void *arg;
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} custom;
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} info;
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}
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vmk_LogThrottleProperties;
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/*
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***********************************************************************
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* vmk_StatusToString -- */ /**
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*
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* \ingroup Logging
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* \brief Convert a status into a human readable text string
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*
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* \param[in] status Return status code to convert to a
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* human-readable string.
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*
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* \return Human-readable string that describes the supplied status.
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*
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***********************************************************************
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*/
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const char *vmk_StatusToString(
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VMK_ReturnStatus status);
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/*
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***********************************************************************
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* vmk_LogRegister -- */ /**
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*
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* \ingroup Logging
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* \brief Register a log component
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*
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* Should be used to create a new log component with a particular
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* string prepended to each message, that can have its log levels
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* controlled independently from other log components.
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*
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* \pre The supplied module should have a heap associated with it.
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*
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* \param[in] name Log component name.
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* \param[in] module Module the log component belongs to.
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* \param[in] defaultLevel Default log level.
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* \param[in] throttleProps User-defined throttling properties or
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* NULL to indicate that no throttling is
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* desired.
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* \param[out] handle Handle to the newly created log component.
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*
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* \retval VMK_BAD_PARAM Bad LogThrottleType specified in
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* the throttle properties.
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* \retval VMK_NO_MEMORY Not enough memory on the module or
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* vmkernel heap to create the new
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* log component.
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* \retval VMK_INVALID_MODULE Supplied module ID is invalid.
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* \retval VMK_EXISTS A log component with the same name has
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* already been registered.
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*
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***********************************************************************
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*/
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VMK_ReturnStatus vmk_LogRegister(
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const char *name,
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vmk_ModuleID module,
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vmk_int32 defaultLevel,
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const vmk_LogThrottleProperties *throttleProps,
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vmk_LogComponentHandle *handle);
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/*
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***********************************************************************
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* vmk_LogUnregister -- */ /**
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*
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* \ingroup Logging
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* \brief Unregister a log component
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*
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* Should be used to unregister an existing logging component
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*
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* \note Should be called before the module heap is destroyed.
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*
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* \param[in] handle Pointer to handle for log component to be
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* unregistered.
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*
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* \retval VMK_NOT_FOUND Supplied log component is invalid/unregisterd.
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*
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***********************************************************************
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*/
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VMK_ReturnStatus vmk_LogUnregister(
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vmk_LogComponentHandle *handle);
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/*
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***********************************************************************
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* vmk_LogGetName -- */ /**
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*
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* \ingroup Logging
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* \brief Get log component name
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*
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* \param[in] handle Log component handle.
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*
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* \return The name associated with the supplied log component handle.
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*
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***********************************************************************
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*/
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const char * vmk_LogGetName(
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vmk_LogComponentHandle handle);
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/*
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***********************************************************************
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* vmk_LogGetCurrentLogLevel -- */ /**
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*
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* \ingroup Logging
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* \brief Get current log level of the given component
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*
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* \param[in] handle Log component handle.
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*
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* \return Current log level of the given component returned.
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*
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***********************************************************************
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*/
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vmk_int32 vmk_LogGetCurrentLogLevel(
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vmk_LogComponentHandle handle);
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/*
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***********************************************************************
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* vmk_LogDebug -- */ /**
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*
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* \ingroup Logging
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* \brief Log a message to a logging component on debug builds only.
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*
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* Should be used to log information messages and non-error conditions.
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*
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* Messages are logged only if the component's log level is greater
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* than or equal to the minimum log level specified.
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*
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* \param[in] handle Log component handle,
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* \param[in] min Minimum log level required to print the message,
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* \param[in] fmt Format string,
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* \param[in] args List of message arguments,
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*
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***********************************************************************
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*/
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#ifndef VMX86_LOG
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#define vmk_LogDebug(handle, min, fmt, args...)
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#else
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#define vmk_LogDebug(handle, min, fmt, args...) \
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vmk_LogLevel(VMK_LOG_URGENCY_NORMAL, handle, min, \
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"%s: %s: " fmt "\n", vmk_LogGetName(handle), \
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__FUNCTION__, ##args)
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#endif
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/*
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***********************************************************************
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* vmk_Log -- */ /**
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*
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* \ingroup Logging
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* \brief Log message to a logging component at its current log level.
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*
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* Should be used to log information messages and non-error conditions.
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*
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* \param[in] handle Log component handle.
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* \param[in] fmt Format string.
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* \param[in] args List of message arguments.
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*
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***********************************************************************
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*/
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#define vmk_Log(handle, fmt, args...) \
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vmk_LogLevel(VMK_LOG_URGENCY_NORMAL, \
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handle, vmk_LogGetCurrentLogLevel(handle), \
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"%s: %s: " fmt "\n", vmk_LogGetName(handle), \
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__FUNCTION__, ##args)
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/*
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***********************************************************************
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* vmk_Warning -- */ /**
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*
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* \ingroup Logging
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* \brief Log a warning message to a logging component at its current
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* log level.
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*
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* Should be used to log abnormal conditions.
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*
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* \param[in] handle Log component handle.
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* \param[in] fmt Format string.
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* \param[in] args List of message arguments.
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*
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***********************************************************************
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*/
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#define vmk_Warning(handle, fmt, args...) \
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vmk_LogLevel(VMK_LOG_URGENCY_WARNING, \
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handle, vmk_LogGetCurrentLogLevel(handle), \
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"%s: %s: " fmt "\n", vmk_LogGetName(handle), \
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__FUNCTION__, ##args)
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/*
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***********************************************************************
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* vmk_Alert -- */ /**
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*
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* \ingroup Logging
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* \brief Log an alert message to a logging component at its current
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* log level.
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*
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* Should be used to notify users of system alerts.
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*
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* \param[in] handle Log component handle.
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* \param[in] fmt Format string.
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* \param[in] args List of message arguments.
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*
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***********************************************************************
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*/
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#define vmk_Alert(handle, fmt, args...) \
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vmk_LogLevel(VMK_LOG_URGENCY_ALERT, \
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handle, vmk_LogGetCurrentLogLevel(handle), \
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"%s: %s: " fmt "\n", vmk_LogGetName(handle), \
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__FUNCTION__, ##args)
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/*
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***********************************************************************
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* vmk_LogDebugMessage -- */ /**
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*
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* \ingroup Logging
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* \brief Log an information message to the vmkernel log unconditionally
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* on debug builds only.
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*
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* Should be used to log information messages and non-error conditions
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* when no log component is available.
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*
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* \param[in] fmt Format string.
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* \param[in] args List of message arguments.
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*
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***********************************************************************
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*/
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#ifndef VMX86_LOG
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#define vmk_LogDebugMessage(fmt, args...)
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#else
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#define vmk_LogDebugMessage(fmt, args...) \
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vmk_LogNoLevel(VMK_LOG_URGENCY_NORMAL, fmt "\n", ##args)
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#endif
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/*
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***********************************************************************
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* vmk_LogMessage -- */ /**
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*
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* \ingroup Logging
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* \brief Log an information message to the vmkernel log unconditionally.
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*
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* Should be used to log information messages and non-error conditions
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* when no log component is available.
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*
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* \param[in] fmt Format string.
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* \param[in] args List of message arguments.
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*
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***********************************************************************
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*/
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#define vmk_LogMessage(fmt, args...) \
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vmk_LogNoLevel(VMK_LOG_URGENCY_NORMAL, fmt "\n", ##args)
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/*
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***********************************************************************
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* vmk_WarningMessage -- */ /**
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*
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* \ingroup Logging
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* \brief Log a warning or error message to the vmkernel log
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* unconditionally.
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*
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* Should be used to log abnormal conditions when no log component is
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* available.
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*
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* \param[in] fmt Format string.
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* \param[in] args List of message arguments.
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*
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***********************************************************************
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*/
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#define vmk_WarningMessage(fmt, args...) \
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vmk_LogNoLevel(VMK_LOG_URGENCY_WARNING, fmt "\n", ##args)
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/*
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***********************************************************************
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* vmk_AlertMessage -- */ /**
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*
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* \ingroup Logging
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* \brief Log a system alert to the vmkernel log and the console
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* unconditionally.
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*
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* Should be used to log severe problems when no log component is
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* available.
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*
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* \param[in] fmt Format string.
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* \param[in] args List of message arguments.
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*
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***********************************************************************
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*/
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#define vmk_AlertMessage(fmt, args...) \
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vmk_LogNoLevel(VMK_LOG_URGENCY_ALERT, fmt "\n", ##args)
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/*
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***********************************************************************
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* vmk_LogSetCurrentLogLevel -- */ /**
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*
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* \ingroup Logging
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* \brief Set current log level of a given log component
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*
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* \param[in] handle Log component handle to modify.
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* \param[in] level Log level to set component to.
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*
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***********************************************************************
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*/
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VMK_ReturnStatus vmk_LogSetCurrentLogLevel(
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vmk_LogComponentHandle handle,
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vmk_int32 level);
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/*
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***********************************************************************
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* vmk_vLogLevel -- */ /**
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*
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* \ingroup Logging
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* \brief Log a message using a log component
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*
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* Output a log message to the vmkernel log if the current log level
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* on the given log component is equal to or greater than the given
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* log level.
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*
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* \param[in] urgency How urgent the message is.
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* \param[in] handle Log component handle.
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* \param[in] level Minimum log level the component must be set to
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* in order to print the message.
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* \param[in] fmt Format string.
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* \param[in] ap List of message arguments.
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*
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***********************************************************************
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*/
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VMK_ReturnStatus vmk_vLogLevel(
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vmk_LogUrgency urgency,
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vmk_LogComponentHandle handle,
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vmk_int32 level,
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const char *fmt,
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va_list ap);
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/*
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***********************************************************************
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* vmk_LogLevel -- */ /**
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*
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* \ingroup Logging
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* \brief Log a message using a log component
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*
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* Output a log message to the vmkernel log if the current log level
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* on the given log component is equal to or greater than the given
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* log level.
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*
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* \param[in] urgency How urgent the message is.
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* \param[in] handle Log component handle.
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* \param[in] level Minimum log level the component must be set to
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* in order to print the message.
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* \param[in] fmt Format string.
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*
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***********************************************************************
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*/
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VMK_ReturnStatus vmk_LogLevel(
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vmk_LogUrgency urgency,
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vmk_LogComponentHandle handle,
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vmk_int32 level,
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const char *fmt,
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...)
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VMK_ATTRIBUTE_PRINTF(4,5);
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/*
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***********************************************************************
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* vmk_vLogNoLevel -- */ /**
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*
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* \ingroup Logging
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* \brief Log an information message to the vmkernel log
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* unconditionally with a va_list.
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*
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* Should be used to log information messages and non-error conditions
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* when no log component is available.
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*
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* \param[in] urgency How urgent the message is.
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* \param[in] fmt Format string.
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* \param[in] ap List of message arguments.
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*
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***********************************************************************
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*/
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VMK_ReturnStatus vmk_vLogNoLevel(
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vmk_LogUrgency urgency,
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const char *fmt,
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va_list ap);
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/*
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***********************************************************************
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* vmk_LogNoLevel -- */ /**
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*
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* \ingroup Logging
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* \brief Log an information message to the vmkernel log
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* unconditionally with variable arguments.
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*
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* Should be used to log information messages and non-error conditions
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* when no log component is available.
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*
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* \param[in] urgency How urgent the message is.
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* \param[in] fmt Format string.
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*
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***********************************************************************
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*/
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VMK_ReturnStatus vmk_LogNoLevel(
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vmk_LogUrgency urgency,
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const char *fmt,
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...)
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VMK_ATTRIBUTE_PRINTF(2,3);
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/*
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***********************************************************************
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* vmk_LogFindLogComponentByName -- */ /**
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*
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* \ingroup Logging
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* \brief Get a log component by the given log component name and
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* the module ID.
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*
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* \param[in] id Module ID that registered the log component
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* \param[in] name Log component name
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* \param[out] handle Returns log component handle of the specified
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* name and the module ID.
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*
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* \retval VMK_NOT_FOUND The given log component name does not exist.
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*
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***********************************************************************
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*/
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VMK_ReturnStatus vmk_LogFindLogComponentByName(
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vmk_ModuleID id,
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const char *name,
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vmk_LogComponentHandle *handle);
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/*
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***********************************************************************
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* vmk_LogBacktrace -- */ /**
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*
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* \ingroup Logging
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* \brief Write the current stack backtrace to a log component.
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*
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* This routine logs at the component's current logging level and
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* at NORMAL urgency.
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*
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* \param[in] handle Log component to write the backtrace to.
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*
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***********************************************************************
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*/
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VMK_ReturnStatus vmk_LogBacktrace(
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vmk_LogComponentHandle handle);
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/*
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***********************************************************************
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* vmk_LogBacktraceMessage -- */ /**
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*
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* \ingroup Logging
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* \brief Write the current stack backtrace to the vmkernel log.
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*
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* Should be used to log the backtrace when no logging component
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* is available.
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*
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***********************************************************************
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*/
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VMK_ReturnStatus vmk_LogBacktraceMessage(void);
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#endif /* _VMKAPI_LOGGING_H_ */
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/** @} */
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