--- version: tip layout: manpage_v2 title: nng_stat_unit(3) ---

nng_stat_unit(3)

NAME

nng_stat_unit - get statistic unit

SYNOPSIS

#include <nng/nng.h>

typedef struct nng_stat nng_stat;

enum {
        NNG_UNIT_NONE,
        NNG_UNIT_BYTES,
        NNG_UNIT_MESSAGES,
        NNG_UNIT_MILLIS,
        NNG_UNIT_EVENTS
};

int nng_stat_unit(nng_stat *stat);

DESCRIPTION

The nng_stat_unit() function returns the unit of quantity measured by the statistic stat.

The returned value will be one of the following values:

NNG_UNIT_NONE

There are no particular units measured. In some cases there may be units, but the type of the unit will be obvious from the name (see nng_stat_name()) of the statistic.

NNG_UNIT_BYTES

The statistic is a count of bytes.

NNG_UNIT_MESSAGES

The statistic is a count of messages. Typically, one message corresponds to a single nng_msg structure.

NNG_UNIT_MILLIS

The statistic is a count of milliseconds.

NNG_STAT_EVENTS

The statistic is a count of some other type of event.

For statistics that are neither NNG_STAT_COUNTER nor NNG_STAT_LEVEL type (see nng_stat_type()), the unit will generally be NNG_UNIT_NONE.

Normally rates can be calculated for NNG_STAT_COUNTER values for any of these units, but for NNG_UNIT_MILLIS rate calculations are generally meaningless.

RETURN VALUES

The units measured by stat.

ERRORS

None.

SEE ALSO

libnng(3), nng_stats_get(3), nng_stat_name(3), nng_stat_type(3), nng_stat_value(3), nng_msg(5), nng_stat(5), nng(7)