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Author image Daisuke Maki
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memcached_stat, memcached_stat_servername, memcached_stat_get_value, memcached_stat_get_keys - Get memcached statistics


C Client Library for memcached (libmemcached, -lmemcached)


  #include <memcached.h>

  memcached_stat_st *memcached_stat (memcached_st *ptr,
                                     char *args,
                                     memcached_return_t *error);

  memcached_return_t memcached_stat_servername (memcached_stat_st *stat,
                                                char *args, 
                                                const char *hostname,
                                                unsigned int port);

  char *
    memcached_stat_get_value (memcached_st *ptr,
                              memcached_stat_st *stat, 
                              const char *key,
                              memcached_return_t *error);

  char ** 
    memcached_stat_get_keys (memcached_st *ptr,
                             memcached_stat_st *stat, 
                             memcached_return_t *error);


libmemcached(3) has the ability to query a memcached 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() 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(1), is provided so that you do not have to write an application to do this.


Varies, see particular functions.

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


To find out more information please check: https://launchpad.net/libmemcached


Brian Aker, <brian@tangent.org>


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