1MEMCACHED_SERVER_CURSOR(3) libmemcached-awesome MEMCACHED_SERVER_CURSOR(3)
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6 memcached_server_cursor - libmemcached Documentation
7
9 #include <libmemcached/memcached.h>
10 Compile and link with -lmemcached
11 uint32_t memcached_server_count(memcached_st *ptr)
13 Parameters
15 ptr -- pointer to initialized memcached_st struct
16 Returns
18 number of configured servers
19 memcached_return_t memcached_server_add(memcached_st *ptr, const char
21 *hostname, in_port_t port)
22 Parameters
24 • ptr -- pointer to initialized memcached_st struct
26 • hostname -- hostname or IP address of the TCP server to
28 add
29 • port -- port of the TCP server
31 Returns
33 memcached_return_t indicating success
34 memcached_return_t memcached_server_add_udp(memcached_st *ptr, const
36 char *hostname, in_port_t port)
37 Parameters
39 • ptr -- pointer to initialized memcached_st struct
41 • hostname -- hostname or IP address of the UDP server to
43 add
44 • port -- port of the UDP server
46 Returns
48 memcached_return_t indicating success
49 memcached_return_t memcached_server_add_unix_socket(memcached_st *ptr,
51 const char *socket)
52 Parameters
54 • ptr -- pointer to initialized memcached_st struct
56 • socket -- path to the UNIX socket of the server to add
58 Returns
60 memcached_return_t indicating success
61 memcached_return_t memcached_server_push(memcached_st *ptr, const mem‐
63 cached_server_st *list)
64 Parameters
66 • ptr -- pointer to initialized memcached_st struct
68 • list -- pre-configured list of servers to push
70 Returns
72 memcached_return_t indicating success
73 const memcached_instance_st *memcached_server_by_key(memcached_st *ptr,
75 const char *key, size_t key_length, memcached_return_t *error)
76 Parameters
78 • ptr -- pointer to initialized memcached_st struct
80 • key -- key to hash and lookup a server
82 • key_length -- length of key without any terminating
84 zero
85 • error -- pointer to memcached_return_t indicating suc‐
87 cess
88 Returns
90 the server instance to be used for storing/retrieving key
91 const memcached_instance_st *memcached_server_get_last_disconnect(const
93 memcached_st *ptr)
94 Parameters
96 ptr -- pointer to initialized memcached_st struct
97 Returns
99 the instance of the last server for which there was a
100 connection problem
101 memcached_return_t memcached_server_cursor(const memcached_st *ptr,
103 const memcached_server_fn *callback, void *context, uint32_t num‐
104 ber_of_callbacks)
105 Parameters
107 • ptr -- pointer to initialized memcached_st struct
109 • callback -- list of memcached_server_fn to be called
111 for each server instance
112 • context -- pointer to user supplied context for the
114 callback
115 • number_of_callbacks -- number of callbacks supplied
117 Returns
119 memcached_return_t indicating success
120 typedef memcached_return_t (*memcached_server_fn)(const memcached_st
122 *ptr, const memcached_instance_st *server, void *context)
123 Param ptr
125 pointer to the memcached_st struct
126 Param server
128 pointer to memcached_instance_st
129 Param context
131 pointer to user supplied context
132 Returns
134 memcached_return_t indicating success
135
137 libmemcached performs operations on a list of hosts. The order of these
138 hosts determine routing to keys. Functions are provided to add keys to
139 memcached_st structures. To manipulate lists of servers see mem‐
140 cached_server_st.
141 memcached_server_count() provides you a count of the current number of
143 servers being used by a memcached_st structure.
144 memcached_server_add() pushes a single TCP server into the memcached_st
146 structure. This server will be placed at the end. Duplicate servers
147 are allowed, so duplication is not checked. Executing this function
148 with the MEMCACHED_BEHAVIOR_USE_UDP behavior set will result in a
149 MEMCACHED_INVALID_HOST_PROTOCOL.
150 memcached_server_add_udp() pushes a single UDP server into the
152 memcached_st structure. This server will be placed at the end. Dupli‐
153 cate servers are allowed, so duplication is not checked. Executing this
154 function without setting the MEMCACHED_BEHAVIOR_USE_UDP behavior will
155 result in a MEMCACHED_INVALID_HOST_PROTOCOL.
156 memcached_server_add_unix_socket() pushes a single UNIX socket into the
158 memcached_st structure. This UNIX socket will be placed at the end.
159 Duplicate servers are allowed, so duplication is not checked. The
160 length of the filename must be one character less than MEM‐
161 CACHED_MAX_HOST_LENGTH.
162 memcached_server_push() pushes an array of memcached_server_st into the
164 memcached_st structure. These servers will be placed at the end. Dupli‐
165 cate servers are allowed, so duplication is not checked. A copy is made
166 of structure so the list provided (and any operations on the list) are
167 not saved.
168 memcached_server_by_key() allows you to provide a key and retrieve the
170 server which would be used for assignment.
171 memcached_server_get_last_disconnect() returns a pointer to the last
173 server for which there was a connection problem. It does not mean this
174 particular server is currently dead but if the library is reporting a
175 server is, the returned server is a very good candidate.
176 memcached_server_cursor() takes a memcached_st and loops through the
178 list of hosts currently in the cursor calling the list of callback
179 functions provided. You can optionally pass in a value via context
180 which will be provided to each callback function. An error return from
181 any callback will terminate the loop. memcached_server_cursor() is
182 passed the original caller memcached_st in its current state.
183
185 Varies, see particular functions.
186
188 memcached(1) libmemcached(3) memcached_server_st(3) memcached_str‐
189 error(3)
1901.1 Nov 09, 2022 MEMCACHED_SERVER_CURSOR(3)