NAME¶

pmem_log_set_threshold - set the logging threshold value

SYNOPSIS¶

    #include <libpmem.h>


    enum pmem_log_level {


        PMEM_LOG_LEVEL_HARK,


        PMEM_LOG_LEVEL_FATAL,


        PMEM_LOG_LEVEL_ERROR,


        PMEM_LOG_LEVEL_WARNING,


        PMEM_LOG_LEVEL_NOTICE,


        PMEM_LOG_LEVEL_INFO,


        PMEM_LOG_LEVEL_DEBUG


    };


    enum pmem_log_threshold {


        PMEM_LOG_THRESHOLD,


        PMEM_LOG_THRESHOLD_AUX


    };


    int pmem_log_set_threshold(enum pmem_log_threshold threshold,


        enum pmem_log_level value);
    

DESCRIPTION¶

pmem_log_set_threshold() sets the logging threshold value.

Available thresholds are:

•

PMEM_LOG_THRESHOLD - the main threshold used to filter out undesired logging messages. Messages less severe than indicated by this threshold’s value are ignored so they won’t make it to the logging function (please see pmem_log_set_function(3)). The default value is PMEM_LOG_WARNING.

•

PMEM_LOG_THRESHOLD_AUX - the auxiliary threshold intended for use inside the logging function (please see pmem_log_get_threshold(3)). A custom logging function may or may not take this threshold into consideration depending on the developer’s needs. For the default logging function behaviour please see pmem_log_set_function(3). The initial value of this threshold is PMEM_LOG_LEVEL_HARK.

Available threshold values are defined by enum pmem_log_level. They are listed in descending order of severity:

•

PMEM_LOG_LEVEL_HARK - only basic library info. Shall be used to effectively suppress the logging since it is used just for a few messages when the program is started and whenever a new logging function is set. Please see pmem_log_set_function(3).

•

PMEM_LOG_LEVEL_FATAL - an error that causes the program to stop working immediately. Sorry.

•

PMEM_LOG_LEVEL_ERROR - an error that causes the current operation to fail

•

PMEM_LOG_LEVEL_WARNING - an unexpected situation that does NOT cause the current operation to fail

•

PMEM_LOG_LEVEL_NOTICE - non-massive info mainly related to public API function completions

•

PMEM_LOG_LEVEL_INFO - massive info e.g. every write operation indication

•

PMEM_LOG_LEVEL_DEBUG - debug info e.g. write operation dump

RETURN VALUE¶

pmem_log_set_threshold() function returns 0 on success or returns a non-zero value and sets errno on failure. On failure, the threshold value remains unchanged.

ERRORS¶

pmem_log_set_threshold() can set the following errno values on fail:

•

EINVAL - threshold is not PMEM_LOG_THRESHOLD nor PMEM_LOG_THRESHOLD_AUX

•

EINVAL - value is not defined by enum pmem_log_level type

•

EAGAIN - multiple threads attempted to change the threshold value concurrently. A retry may fix the problem. This error is not expected when the function is called from just one thread at a time.

SEE ALSO¶

pmem_log_get_threshold(3), pmem_log_set_function(3).