DOKK / manpages / debian 12 / liblog4c-doc / log4c_ROLLINGPOLICY_ROLLOVER_ERR_CAN_LOG.3.en
rollingpolicy.h(3) log4c rollingpolicy.h(3)

rollingpolicy.h - Log4c rolling policy interface. Defines the interface for managing and providing rolling policies.

#include <stdio.h>
#include <log4c/defs.h>
#include <log4c/layout.h>


struct log4c_rollingpolicy_type
log4c rollingpolicy type. Defines the interface a specific policy must provide to the rollingfile appender.


#define ROLLINGPOLICY_ROLLOVER_ERR_CAN_LOG 0x05


typedef struct __log4c_rollingpolicy log4c_rollingpolicy_t
typedef struct log4c_rollingpolicy_type log4c_rollingpolicy_type_t
log4c rollingpolicy type. Defines the interface a specific policy must provide to the rollingfile appender.


log4c_rollingpolicy_t * log4c_rollingpolicy_get (const char *policy_name)
const log4c_rollingpolicy_type_t * log4c_rollingpolicy_type_set (const log4c_rollingpolicy_type_t *a_type)
void log4c_rollingpolicy_set_udata (log4c_rollingpolicy_t *policyp, void *udatap)
int log4c_rollingpolicy_init (log4c_rollingpolicy_t *policyp, rollingfile_udata_t *rfup)
int log4c_rollingpolicy_fini (log4c_rollingpolicy_t *policyp)
int log4c_rollingpolicy_is_triggering_event (log4c_rollingpolicy_t *policyp, const log4c_logging_event_t *evtp, long current_file_size)
const log4c_rollingpolicy_type_t * log4c_rollingpolicy_set_type (log4c_rollingpolicy_t *a_rollingpolicy, const log4c_rollingpolicy_type_t *a_type)
const log4c_rollingpolicy_type_t * log4c_rollingpolicy_type_get (const char *a_name)
void * log4c_rollingpolicy_get_udata (const log4c_rollingpolicy_t *policyp)
rollingfile_udata_t * log4c_rollingpolicy_get_rfudata (const log4c_rollingpolicy_t *policyp)

Log4c rolling policy interface. Defines the interface for managing and providing rolling policies.

A rolling policy is used to confogure a rollingfile appender to tell it when to trigger a rolover event.

Effect a rollover according to policyp on the given file stream.

Parameters

policyp pointer to the rolling policy
fp filestream to rollover.

Returns

zero if successful, non-zero otherwise. The policy can return an indication that something went wrong but that the rollingfile appender can stull go ahead and log by returning an error code <= ROLLINGPOLICY_ROLLOVER_ERR_CAN_LOG. Anything greater than means that the rolling file appender will not try to log it's message.

log4c rollingpolicy type

log4c rollingpolicy type. Defines the interface a specific policy must provide to the rollingfile appender. Attributes description:

  • name rollingpolicy type name
  • init() init the rollingpolicy
  • is_triggering_event()
  • rollover()

Call the un initialization code of a rolling policy. This will call the fini routine of the particular rollingpolicy type to allow it to free up resources. If the call to fini in the rollingpolicy type fails then the rollingpolicy is not uninitialized. Try again later model...

Parameters

policyp pointer to the rolling policy

Returns

zero if successful, non-zero otherwise.

log4c_rollingpolicy_t * log4c_rollingpolicy_get (const char * policy_name)

Get a new rolling policy

Parameters

policy_name a name for the policy

Returns

a new rolling policy, otherwise NULL.

Get the rollingfile appender associated with this policy.

Parameters

policyp pointer to the rolling policy

Returns

pointer to the rolling file appender associated with this policy

Get the rolling policy configuration.

Parameters

policyp pointer to the rolling policy

Returns

pointer to the rolling policy configuration.

Call the initialization code of a rolling policy.

Parameters

policyp pointer to the rolling policy
rfup the rolling appender user data this policy is used with

Returns

zero if successful, non-zero otherwise.

Determine if a logging event should trigger a rollover according to the given policy.

Parameters

policyp pointer to the rolling policy
evtp the logging event pointer.
current_file_size the size of the current file being logged to.

Returns

non-zero if rollover required, zero otherwise.

const log4c_rollingpolicy_type_t * log4c_rollingpolicy_set_type (log4c_rollingpolicy_t * a_rollingpolicy, const log4c_rollingpolicy_type_t * a_type)

sets the rolling policy type

Parameters

a_rollingpolicy the log4c_rollingpolicy_t object
a_type the new rollingpolicy type

Returns

the previous appender type

Configure a rolling policy with a specific policy.

Parameters

policyp pointer to the rolling policy
udatap a specific policy type, for example sizewin.

Returns

zero if successful, non-zero otherwise.

const log4c_rollingpolicy_type_t * log4c_rollingpolicy_type_get (const char * a_name)

Get a pointer to an existing rollingpolicy type.

Parameters

a_name the name of the rollingpolicy type to return.

Returns

a pointer to an existing rollingpolicy type, or NULL if no rollingpolicy type with the specified name exists.

const log4c_rollingpolicy_type_t * log4c_rollingpolicy_type_set (const log4c_rollingpolicy_type_t * a_type)

Use this function to register a rollingpolicy type with log4c. Once this is done you may refer to this type by name both programmatically and in the log4c configuration file.

Parameters

a_type a pointer to the new rollingpolicy type to register.

Returns

a pointer to the previous rollingpolicy type of same name.

Example code fragment:

const log4c_rollingpolicy_type_t log4c_rollingpolicy_type_sizewin = {


  "sizewin",


  sizewin_init,


  sizewin_is_triggering_event,


  sizewin_rollover
};
log4c_rollingpolicy_type_set(&log4c_rollingpolicy_type_sizewin);

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Thu Jan 19 2023 Version 1.2.4