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MEMCACHED_FETCH(3) libmemcached-awesome MEMCACHED_FETCH(3)

NAME

memcached_fetch - Retrieving data from the server

SYNOPSIS

#include <libmemcached/memcached.h>
Compile and link with -lmemcached

Deprecated since version 0.50: Use memcached_fetch_result() <#_CPPv422memcached_fetch_resultP12memcached_stP19memcached_result_stP18memcached_return_t> instead.


DESCRIPTION

memcached_fetch() is used to fetch an individual value from the server. memcached_mget() <#_CPPv414memcached_mgetP12memcached_stPPCKcPK6size_t6size_t> must always be called before using this method. You must pass in a key and its length to fetch the object.

You must supply three pointer variables which will give you the state of the returned object:

  • A uint32_t pointer to contain whatever flags you stored with the value,
  • a size_t pointer which will be filled with size of of the object, and
  • a memcached_return_t <#_CPPv418memcached_return_t> pointer to hold any error.



The object will be returned upon success and NULL will be returned on failure.

MEMCACHED_END <#_CPPv4N18memcached_return_t13MEMCACHED_ENDE> is returned by the error value when all objects that have been found are returned. The final value upon MEMCACHED_END <#_CPPv4N18memcached_return_t13MEMCACHED_ENDE> is a NULL pointer.

Values returned by memcached_fetch() must be freed by the caller.

All of the above functions are not tested when the MEMCACHED_BEHAVIOR_USE_UDP <#_CPPv4N20memcached_behavior_t26MEMCACHED_BEHAVIOR_USE_UDPE> has been set. Executing any of these functions with this behavior on will result in MEMCACHED_NOT_SUPPORTED <#_CPPv4N18memcached_return_t23MEMCACHED_NOT_SUPPORTEDE> being returned, or for those functions which do not return a memcached_return_t <#_CPPv418memcached_return_t>, the error function parameter will be set to MEMCACHED_NOT_SUPPORTED <#_CPPv4N18memcached_return_t23MEMCACHED_NOT_SUPPORTEDE>.

RETURN VALUE

memcached_fetch() sets error to to MEMCACHED_END <#_CPPv4N18memcached_return_t13MEMCACHED_ENDE> upon successful conclusion.

MEMCACHED_NOTFOUND <#_CPPv4N18memcached_return_t18MEMCACHED_NOTFOUNDE> will be return if no keys at all were found.

MEMCACHED_KEY_TOO_BIG <#_CPPv4N18memcached_return_t21MEMCACHED_KEY_TOO_BIGE> is set to error whenever memcached_fetch() was used and the key was set larger then MEMCACHED_MAX_KEY, which was the largest key allowed for the original memcached ascii server.

SEE ALSO

memcached(1) <https://linux.die.net/man/1/memcached> libmemcached(3) <https://linux.die.net/man/3/libmemcached> memcached_strerror(3) <https://linux.die.net/man/3/memcached_strerror> memcached_fetch_result(3) <https://linux.die.net/man/3/memcached_fetch_result>

January 17, 2026 1.1