================================================== Working with statistical information from a server ================================================== Get memcached statistics .. index:: object: memcached_st -------- SYNOPSIS -------- #include .. c:type:: memcached_stat_st .. c:type:: memcached_return_t (*memcached_stat_fn)(const memcached_instance_st * server, const char *key, size_t key_length, const char *value, size_t value_length, void *context) .. c:function:: memcached_stat_st *memcached_stat (memcached_st *ptr, char *args, memcached_return_t *error) .. c:function:: memcached_return_t memcached_stat_servername (memcached_stat_st *stat, char *args, const char *hostname, in_port_t port) .. c:function:: char * memcached_stat_get_value (memcached_st *ptr, memcached_stat_st *stat, const char *key, memcached_return_t *error) .. c:function:: char ** memcached_stat_get_keys (memcached_st *ptr, memcached_stat_st *stat, memcached_return_t *error) .. c:function:: memcached_return_t memcached_stat_execute (memcached_st *memc, const char *args, memcached_stat_fn func, void *context) Compile and link with -lmemcached ----------- DESCRIPTION ----------- libmemcached(3) has the ability to query a memcached server (or collection of servers) for their current state. Queries to find state return a :c:type:`memcached_stat_st` structure. You are responsible for freeing this structure. While it is possible to access the structure directly it is not advisable. :c:func:`memcached_stat_get_value` has been provided to query the structure. :c:func:`memcached_stat_execute` uses the servers found in :c:type:`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. :c:func:`memcached_stat` fetches an array of :c:type:`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 :c:type:`MEMCACHED_BEHAVIOR_USE_UDP` behavior set, a NULL value is returned and the error parameter is set to :c:type:`MEMCACHED_NOT_SUPPORTED`. :c:func:`memcached_stat_servername` can be used standalone without a :c:type:`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 :c:func:`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. :c:func:`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. :c:func:`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. ------ RETURN ------ Varies, see particular functions. Any method returning a :c:type:`memcached_stat_st` expects you to free the memory allocated for it. ---- HOME ---- To find out more information please check: `http://libmemcached.org/ `_ ------ AUTHOR ------ Brian Aker, -------- SEE ALSO -------- :manpage:`memcached(1)` :manpage:`libmemcached(3)` :manpage:`memcached_strerror(3)`