MEMCACHED_SERVER_COUNT(3)

📦
version 1.1.4 · 13 versions
, in fedora 43

✨ NAME ✨

memcached_server_count — the libmemcached Documentation situation, bestie 💖 (this is one of the libmemcached-awesome pages, and yes we're gonna go through literally every function on it)

🎀 SYNOPSIS 🎀

#include <libmemcached/memcached.h>

Compile and link with -lmemcached

uint32_t memcached_server_count(memcached_st *ptr)

Parameters

  • ptr — pointer to initialized memcached_st struct

Returns

number of configured servers

memcached_return_t memcached_server_add(memcached_st *ptr, const char *hostname, in_port_t port)

Parameters

  • ptr — pointer to initialized memcached_st struct
  • hostname — hostname or IP address of the TCP server to add
  • port — port of the TCP server

Returns

memcached_return_t indicating success

memcached_return_t memcached_server_add_udp(memcached_st *ptr, const char *hostname, in_port_t port)

Parameters

  • ptr — pointer to initialized memcached_st struct
  • hostname — hostname or IP address of the UDP server to add
  • port — port of the UDP server

Returns

memcached_return_t indicating success

memcached_return_t memcached_server_add_unix_socket(memcached_st *ptr, const char *socket)

Parameters

  • ptr — pointer to initialized memcached_st struct
  • socket — path to the UNIX socket of the server to add

Returns

memcached_return_t indicating success

memcached_return_t memcached_server_push(memcached_st *ptr, const memcached_server_st *list)

Parameters

  • ptr — pointer to initialized memcached_st struct
  • list — pre-configured list of servers to push

Returns

memcached_return_t indicating success

const memcached_instance_st *memcached_server_by_key(memcached_st *ptr, const char *key, size_t key_length, memcached_return_t *error)

Parameters

  • ptr — pointer to initialized memcached_st struct
  • key — key to hash and lookup a server
  • key_length — length of key without any terminating zero
  • error — pointer to memcached_return_t indicating success

Returns

the server instance to be used for storing/retrieving key

const memcached_instance_st *memcached_server_get_last_disconnect(const memcached_st *ptr)

Parameters

  • ptr — pointer to initialized memcached_st struct

Returns

the instance of the last server for which there was a connection problem

memcached_return_t memcached_server_cursor(const memcached_st *ptr, const memcached_server_fn *callback, void *context, uint32_t number_of_callbacks)

Parameters

  • ptr — pointer to initialized memcached_st struct
  • callback — list of memcached_server_fn to be called for each server instance
  • context — pointer to user supplied context for the callback
  • number_of_callbacks — number of callbacks supplied

Returns

memcached_return_t indicating success

typedef memcached_return_t (*memcached_server_fn)(const memcached_st *ptr, const memcached_instance_st *server, void *context)

Param ptr

pointer to the memcached_st struct

Param server

pointer to memcached_instance_st

Param context

pointer to user supplied context

Returns

memcached_return_t indicating success

🦋 DESCRIPTION 🦋

okok so here's the tea ☕ libmemcached is out here doing operations on a list of hosts, and the order of those hosts is literally what decides routing to keys. There are functions handed to you for adding keys to memcached_st structures. And if you wanna manipulate lists of servers, go look at memcached_server_st.

memcached_server_count() hands you a count of the current number of servers being used by a memcached_st structure. simple. iconic. 💅

memcached_server_add() pushes a single TCP server into the memcached_st structure. That server gets placed at the end. Duplicate servers are allowed, so like, duplication is not checked — she does not care. But heads up bestie: executing this function with the MEMCACHED_BEHAVIOR_USE_UDP behavior set will result in a MEMCACHED_INVALID_HOST_PROTOCOL. 😭

memcached_server_add_udp() pushes a single UDP server into the memcached_st structure. Also placed at the end. Duplicates allowed, duplication not checked. And the flip side of the vibe: executing this function without setting the MEMCACHED_BEHAVIOR_USE_UDP behavior will result in a MEMCACHED_INVALID_HOST_PROTOCOL. 🫠

memcached_server_add_unix_socket() pushes a single UNIX socket into the memcached_st structure. This UNIX socket is placed at the end. Duplicates allowed, duplication not checked. The length of the filename must be one character less than MEMCACHED_MAX_HOST_LENGTH. ⚠️ not a suggestion, that's the rule.

memcached_server_push() pushes an array of memcached_server_st into the memcached_st structure. These servers get placed at the end. Duplicates allowed, duplication not checked. A copy is made of the structure so the list you provided (and any operations on that list) are not saved. so go ahead and do whatever with your list afterwards, she's not watching 🧚

memcached_server_by_key() lets you provide a key and retrieve the server which would be used for assignment. cute little peek behind the curtain ✨

memcached_server_get_last_disconnect() returns a pointer to the last server for which there was a connection problem. Important nuance, don't misread it: it does not mean this particular server is currently dead. But if the library is reporting a server is dead, the returned server is a very good candidate. like, prime suspect energy 💀

memcached_server_cursor() takes a memcached_st and loops through the list of hosts currently in the cursor, calling the list of callback functions provided. You can optionally pass in a value via context which will be provided to each callback function. An error return from any callback will terminate the loop. Also: memcached_server_cursor() is passed the original caller memcached_st in its current state.

👑 RETURN VALUE 👑

Varies, see particular functions. (yes that's really it, she said read the individual functions, slay 🌈)

🔥 SEE ALSO 🔥

and that's the whole page, bestie!! this was libmemcached-awesome version 1.1, dated Jul 24, 2025 — go forth and configure your servers, no cap 💖🦋✨

📦 where this page comes from