git.m6w6.name Git - m6w6/libmemcached/blob - docs/memcached_stats.rst

   1 ==================================================
   2 Working with statistical information from a server
   3 ==================================================
   4
   5
   6 Get memcached statistics
   7
   8 .. index:: object: memcached_st
   9
  10
  11 --------
  12 SYNOPSIS
  13 --------
  14
  15 #include <libmemcached/memcached.h>
  16
  17 .. c:type:: memcached_stat_st
  18
  19 .. c:type:: memcached_return_t (*memcached_stat_fn)(memcached_server_instance_st server, const char *key, size_t key_length, const char *value, size_t value_length, void *context)
  20
  21 .. c:function:: memcached_stat_st *memcached_stat (memcached_st *ptr, char *args, memcached_return_t *error)
  22
  23 .. c:function:: memcached_return_t memcached_stat_servername (memcached_stat_st *stat, char *args, const char *hostname, in_port_t port)
  24
  25 .. c:function:: char * memcached_stat_get_value (memcached_st *ptr, memcached_stat_st *stat, const char *key, memcached_return_t *error)
  26
  27 .. c:function:: char ** memcached_stat_get_keys (memcached_st *ptr, memcached_stat_st *stat, memcached_return_t *error)
  28
  29 .. c:function:: memcached_return_t memcached_stat_execute (memcached_st *memc, const char *args, memcached_stat_fn func, void *context)
  30
  31 Compile and link with -lmemcached
  32
  33 -----------
  34 DESCRIPTION
  35 -----------
  36
  37
  38 libmemcached(3) has the ability to query a memcached server (or collection
  39 of servers) for their current state. Queries to find state return a
  40 :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.
  41
  42 :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
  43 the memcached server.
  44
  45 :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`.
  46
  47 :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
  48 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
  49 obtain information on.
  50
  51 :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.
  52
  53 :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.
  54
  55 A command line tool, memstat(1), is provided so that you do not have to write
  56 an application to do this.
  57
  58
  59 ------
  60 RETURN
  61 ------
  62
  63
  64 Varies, see particular functions.
  65
  66 Any method returning a :c:type:`memcached_stat_st` expects you to free the
  67 memory allocated for it.
  68
  69
  70 ----
  71 HOME
  72 ----
  73
  74
  75 To find out more information please check:
  76 `http://libmemcached.org/ <http://libmemcached.org/>`_
  77
  78
  79 ------
  80 AUTHOR
  81 ------
  82
  83
  84 Brian Aker, <brian@tangent.org>
  85
  86
  87 --------
  88 SEE ALSO
  89 --------
  90
  91
  92 :manpage:`memcached(1)` :manpage:`libmemcached(3)` :manpage:`memcached_strerror(3)`
  93