cmap_set (3) - Linux Manuals

cmap_set: Store value in CMAP


cmap_set - Store value in CMAP


#include <corosync/cmap.h>

cs_error_t cmap_set (cmap_handle_t handle, const char *key_name, const void *value, size_t value_len, cmap_value_types_t type);

Also shortcuts for different types are defined

cs_error_t cmap_set_int8(cmap_handle_t handle, const char *key_name, int8_t value);

cs_error_t cmap_set_uint8(cmap_handle_t handle, const char *key_name, uint8_t value);

cs_error_t cmap_set_int16(cmap_handle_t handle, const char *key_name, int16_t value);

cs_error_t cmap_set_uint16(cmap_handle_t handle, const char *key_name, uint16_t value);

cs_error_t cmap_set_int32(cmap_handle_t handle, const char *key_name, int32_t value);

cs_error_t cmap_set_uint32(cmap_handle_t handle, const char *key_name, uint32_t value);

cs_error_t cmap_set_int64(cmap_handle_t handle, const char *key_name, int64_t value);

cs_error_t cmap_set_uint64(cmap_handle_t handle, const char *key_name, uint64_t value);

cs_error_t cmap_set_float(cmap_handle_t handle, const char *key_name, float value);

cs_error_t cmap_set_double(cmap_handle_t handle, const char *key_name, double value);

cs_error_t cmap_set_string(cmap_handle_t handle, const char *key_name, const char *value);


The cmap_set function is used to store key inside cmap. The handle argument is connection to CMAP database obtained by calling cmap_initialize(3) function. key_name is name of key to set value. Key name is limited by minimal (CMAP_KEYNAME_MINLEN, currently 3) and maximal (CMAP_KEYNAME_MAXLEN, currently 255) length. Also key can contain only limited set of characters expressed by regexp [a-zA-Z0-9._-/:]*. value is pointer to allocated data which will be stored inside CMAP. Length of value (number of bytes) is supplied as value_len parameter. Last parameter is type which gives type of value. It may be one of:

CMAP_VALUETYPE_INT8 - 8-bit signed integer

CMAP_VALUETYPE_UINT8 - 8-bit unsigned integer

CMAP_VALUETYPE_INT16 - 16-bit signed integer

CMAP_VALUETYPE_UINT16 - 16-bit unsigned integer

CMAP_VALUETYPE_INT32 - 32-bit signed integer

CMAP_VALUETYPE_UINT32 - 32-bit unsigned integer

CMAP_VALUETYPE_INT64 - 64-bit signed integer

CMAP_VALUETYPE_UINT64 - 64-bit unsigned integer




CMAP_VALUETYPE_BINARY - Binary data, byte with zero value has no special meaning


This call returns the CS_OK value if successful. If value or key_name are unspecified, CS_ERR_INVALID_PARAM is returned. Too short or too long key_name returns CS_ERR_NAME_TOO_LONG error code. Some of keys may be tagged read-only directly in corosync and seting such key will result in CS_ERR_ACCESS error.


cmap_get(3), cmap_initialize(3), cmap_overview(8)

CS_ERR_TRY_AGAIN Resource temporarily unavailable

CS_ERR_INVALID_PARAM Invalid argument

CS_ERR_ACCESS Permission denied

CS_ERR_LIBRARY The connection failed

CS_ERR_INTERRUPT System call inturrupted by a signal

CS_ERR_NOT_SUPPORTED The requested protocol/functuality not supported

CS_ERR_MESSAGE_ERROR Incorrect auth message received

CS_ERR_NO_MEMORY Not enough memory to completed the requested task