table of contents
| MEMCACHED_STAT_GET_VALUE(3) | libmemcached-awesome | MEMCACHED_STAT_GET_VALUE(3) |
NAME¶
memcached_stat_get_value - libmemcached Documentation
Get memcached statistics
SYNOPSIS¶
- #include <libmemcached/memcached.h>
- Compile and link with -lmemcached
- server -- pointer to the memcached_instance_st being stat'ed
- key -- the current key
- key_length -- the length of the key without any terminating zero
- value -- the value read
- value_length -- the length of the value without any terminating zero
- context -- pointer to the user supplied context
- Returns
- memcached_return_t indicating success
- ptr -- pointer to an initialized memcached_st struct
- args -- particular state object to query
- error -- pointer to memcached_return_t indicating success
- Returns
- array of memcached_stat_st objects for all available servers
- stat -- pointer to a memcached_stat_st struct to fill
- args -- particular state object to query
- hostname -- the hostname or IP address of the server to stat
- port -- the port of the server to stat
- Returns
- memcached_return_t indicating success
- ptr -- pointer to initialized memcached_st struct
- stat -- pointer to initialized memcached_stat_st struct
- key -- the statistic to query
- error -- pointer to memcached_return_t indicating success
- Returns
- string value of the statistic
- ptr -- pointer to initialized memcached_st struct
- stat -- pointer to initialized memcached_stat_st struct
- error -- pointer to memcached_return_t indicating success
- Returns
- array of default keys probably available in the statistics
- ptr -- pointer to initialized memcached_st struct
- args -- particular state object to query
- func -- memcached_stat_fn callback
- context -- pointer to user supplied context
- Returns
- memcached_return_t indication success
DESCRIPTION¶
libmemcached has the ability to query a memcached(1) server (or collection of servers) for their current state. Queries to find state return a memcached_stat_st structure. You are responsible for freeing this structure. While it is possible to access the structure directly it is not advisable. memcached_stat_get_value() has been provided to query the structure.
memcached_stat_execute() uses the servers found in 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.
memcached_stat() fetches an array of 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 MEMCACHED_BEHAVIOR_USE_UDP behavior set, a NULL value is returned and the error parameter is set to MEMCACHED_NOT_SUPPORTED.
memcached_stat_servername() can be used standalone without a 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 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.
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.
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, is provided so that you do not have to write an application to do this.
RETURN VALUE¶
Varies, see particular functions.
Any method returning a memcached_stat_st expects you to free the memory allocated for it.
SEE ALSO¶
| November 12, 2021 | 1.1 |