Logging

Logging — Message and error logging.

Synopsis

int                 (*librdf_log_level_func)            (void *user_data,
                                                         const char *message,
                                                         va_list arguments);
int                 (*librdf_log_func)                  (void *user_data,
                                                         librdf_log_message *message);
enum                librdf_log_level;
enum                librdf_log_facility;
int                 librdf_log_message_code             (librdf_log_message *message);
librdf_log_level    librdf_log_message_level            (librdf_log_message *message);
librdf_log_facility librdf_log_message_facility         (librdf_log_message *message);
const char *        librdf_log_message_message          (librdf_log_message *message);
raptor_locator *    librdf_log_message_locator          (librdf_log_message *message);

Description

Provides structured access to debug, information, warning and error messages from the libraries. Structured information is most often used from errors such as parsing where file or URI and line numbers can be returned via a raptor_locator object pointer found by librdf_log_message_locator() on the librdf_log_message.

Details

librdf_log_level_func ()

int                 (*librdf_log_level_func)            (void *user_data,
                                                         const char *message,
                                                         va_list arguments);

Handler for one log level, for the warning and error levels ONLY. Used by librdf_world_set_warning and librdf_world_set_error.

user_data :

User data pointer

message :

Log message.

arguments :

Message arguments.

Returns :

non-zero to indicate log message has been handled

librdf_log_func ()

int                 (*librdf_log_func)                  (void *user_data,
                                                         librdf_log_message *message);

Handler for all log levels.

user_data :

User data pointer

message :

Log message structure pointer.

Returns :

non-zero to indicate log message has been handled

enum librdf_log_level

typedef enum {
  LIBRDF_LOG_NONE = 0,
  LIBRDF_LOG_DEBUG,
  LIBRDF_LOG_INFO,
  LIBRDF_LOG_WARN,
  LIBRDF_LOG_ERROR,
  LIBRDF_LOG_FATAL,
  LIBRDF_LOG_LAST=LIBRDF_LOG_FATAL
} librdf_log_level;

Indicates the level of the log message.

LIBRDF_LOG_NONE

No level

LIBRDF_LOG_DEBUG

Debug.

LIBRDF_LOG_INFO

Information.

LIBRDF_LOG_WARN

Warning.

LIBRDF_LOG_ERROR

Recoverable error. Program can continue.

LIBRDF_LOG_FATAL

Fatal error. Program will abort if this is not caught.

LIBRDF_LOG_LAST

Internal, never returned.

enum librdf_log_facility

typedef enum {
  LIBRDF_FROM_NONE = 0,
  LIBRDF_FROM_CONCEPTS,
  LIBRDF_FROM_DIGEST,
  LIBRDF_FROM_FILES,
  LIBRDF_FROM_HASH,
  LIBRDF_FROM_INIT,
  LIBRDF_FROM_ITERATOR,
  LIBRDF_FROM_LIST,
  LIBRDF_FROM_MODEL,
  LIBRDF_FROM_NODE,
  LIBRDF_FROM_PARSER,
  LIBRDF_FROM_QUERY,
  LIBRDF_FROM_SERIALIZER,
  LIBRDF_FROM_STATEMENT,
  LIBRDF_FROM_STORAGE,
  LIBRDF_FROM_STREAM,
  LIBRDF_FROM_URI,
  LIBRDF_FROM_UTF8,
  LIBRDF_FROM_MEMORY,
  LIBRDF_FROM_RAPTOR,
  LIBRDF_FROM_LAST=LIBRDF_FROM_RAPTOR
} librdf_log_facility;

Indicates the part of the system that generated the log message.

LIBRDF_FROM_NONE

Associated with no part.

LIBRDF_FROM_CONCEPTS

Concepts

LIBRDF_FROM_DIGEST

Digest

LIBRDF_FROM_FILES

Files

LIBRDF_FROM_HASH

Hash

LIBRDF_FROM_INIT

Init

LIBRDF_FROM_ITERATOR

Iterator

LIBRDF_FROM_LIST

List

LIBRDF_FROM_MODEL

Model

LIBRDF_FROM_NODE

Node

LIBRDF_FROM_PARSER

Parser

LIBRDF_FROM_QUERY

Query

LIBRDF_FROM_SERIALIZER

Serializer

LIBRDF_FROM_STATEMENT

Statement

LIBRDF_FROM_STORAGE

Storage

LIBRDF_FROM_STREAM

Stream

LIBRDF_FROM_URI

URI

LIBRDF_FROM_UTF8

UTF8

LIBRDF_FROM_MEMORY

Memory

LIBRDF_FROM_RAPTOR

Raptor library (parser or serializer; Raptor 2.0.0+).

LIBRDF_FROM_LAST

Internal, never returned.

librdf_log_message_code ()

int                 librdf_log_message_code             (librdf_log_message *message);

Retrieve error code from log message.

message :

log message

Returns :

int error code

librdf_log_message_level ()

librdf_log_level    librdf_log_message_level            (librdf_log_message *message);

Retrieve severity of log message.

The log message severity level is defined in rdf_log.h as values of enum librdf_log_level

message :

log message

Returns :

severity level

librdf_log_message_facility ()

librdf_log_facility librdf_log_message_facility         (librdf_log_message *message);

Retrieve facility that generated the message.

The log message facility is defined in rdf_log.h as values of enum librdf_log_facility

message :

log message

Returns :

ID of Redland facility that generated the log message.

librdf_log_message_message ()

const char *        librdf_log_message_message          (librdf_log_message *message);

Retrieve text message from log entry.

The string returned is shared and must be copied by the caller if required to be retained.

message :

log message

Returns :

shared pointer to the log message string

librdf_log_message_locator ()

raptor_locator *    librdf_log_message_locator          (librdf_log_message *message);

Retrieve locator of log entry.

message :

log message

Returns :

pointer to an appropriate raptor_locator* or NULL if not available


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