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MEMCACHED_STAT_GET_VALUE(3) libmemcached-awesome MEMCACHED_STAT_GET_VALUE(3)

NAME

memcached_stat_get_value - libmemcached Documentation

Get memcached statistics

SYNOPSIS

#include <libmemcached/memcached.h>
Compile and link with -lmemcached


  • server -- pointer to the memcached_instance_st being stat'ed
  • key -- the current key
  • key_length -- the length of the key without any terminating zero
  • value -- the value read
  • value_length -- the length of the value without any terminating zero
  • context -- pointer to the user supplied context

memcached_return_t indicating success


  • ptr -- pointer to an initialized memcached_st struct
  • args -- particular state object to query
  • error -- pointer to memcached_return_t indicating success

array of memcached_stat_st objects for all available servers


  • stat -- pointer to a memcached_stat_st struct to fill
  • args -- particular state object to query
  • hostname -- the hostname or IP address of the server to stat
  • port -- the port of the server to stat

memcached_return_t indicating success


  • ptr -- pointer to initialized memcached_st struct
  • stat -- pointer to initialized memcached_stat_st struct
  • key -- the statistic to query
  • error -- pointer to memcached_return_t indicating success

string value of the statistic


  • ptr -- pointer to initialized memcached_st struct
  • stat -- pointer to initialized memcached_stat_st struct
  • error -- pointer to memcached_return_t indicating success

array of default keys probably available in the statistics


  • ptr -- pointer to initialized memcached_st struct
  • args -- particular state object to query
  • func -- memcached_stat_fn callback
  • context -- pointer to user supplied context

memcached_return_t indication success


DESCRIPTION

libmemcached has the ability to query a memcached(1) server (or collection of servers) for their current state. Queries to find state return a memcached_stat_st structure. You are responsible for freeing this structure. While it is possible to access the structure directly it is not advisable. memcached_stat_get_value() has been provided to query the structure.

memcached_stat_execute() uses the servers found in memcached_stat_st and executes a "stat" command on each server. args is an optional argument that can be passed in to modify the behavior of "stats". You will need to supply a callback function that will be supplied each pair of values returned by the memcached server.

memcached_stat() fetches an array of memcached_stat_st structures containing the state of all available memcached servers. The return value must be freed by the calling application. If called with the MEMCACHED_BEHAVIOR_USE_UDP behavior set, a NULL value is returned and the error parameter is set to MEMCACHED_NOT_SUPPORTED.

memcached_stat_servername() can be used standalone without a memcached_st to obtain the state of a particular server. "args" is used to define a particular state object (a list of these are not provided for by either the memcached_stat_get_keys() call nor are they defined in the memcached protocol). You must specify the hostname and port of the server you want to obtain information on.

memcached_stat_get_value() returns the value of a particular state key. You specify the key you wish to obtain. The key must be null terminated.

memcached_stat_get_keys() returns a list of keys that the server has state objects on. You are responsible for freeing this list.

A command line tool, memstat, is provided so that you do not have to write an application to do this.

RETURN VALUE

Varies, see particular functions.

Any method returning a memcached_stat_st expects you to free the memory allocated for it.

SEE ALSO

memcached(1) libmemcached(3) memcached_strerror(3)

November 12, 2021 1.1