NAME

       cmap_get - Retreive value from CMAP

SYNOPSIS

       #include <corosync/cmap.h>

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

       Also shortcuts for different types are defined

       cs_error_t cmap_get_int8 (cmap_handle_t handle, const char *key_name, int8_t *i8);

       cs_error_t cmap_get_uint8 (cmap_handle_t handle, const char *key_name, uint8_t *u8);

       cs_error_t cmap_get_int16 (cmap_handle_t handle, const char *key_name, int16_t *i16);

       cs_error_t cmap_get_uint16 (cmap_handle_t handle, const char *key_name, uint16_t *u16);

       cs_error_t cmap_get_int32 (cmap_handle_t handle, const char *key_name, int32_t *i32);

       cs_error_t cmap_get_uint32 (cmap_handle_t handle, const char *key_name, uint32_t *u32);

       cs_error_t cmap_get_int64 (cmap_handle_t handle, const char *key_name, int64_t *i64);

       cs_error_t cmap_get_uint64 (cmap_handle_t handle, const char *key_name, uint64_t *u64);

       cs_error_t cmap_get_float (cmap_handle_t handle, const char *key_name, float *flt);

       cs_error_t cmap_get_double (cmap_handle_t handle, const char *key_name, double *dbl);

       cs_error_t cmap_get_string (cmap_handle_t handle, const char *key_name, char **str);

DESCRIPTION

       The cmap_get function is used to retreive key from cmap  previously  set  by  cmap_set(3)  function.  The
       handle argument is connection to CMAP database obtained by calling cmap_initialize(3) function.  key_name
       is  name  of  key to get value from.  value is pointer to preallocated data used as storage for data, but
       can be also NULL, and then only value_len and/or type is  returned  (both  of  them  can  also  be  NULL,
       allowing  function to be used only for test of existence of key).  If value is not NULL, actual length of
       value in map is checked against *value_len.  If *value_len is shorter then length of value in map,  error
       CS_ERR_INVALID_PARAM  is  returned. After successful copy of value, *value_len is set to actual length of
       value in map. Parameter type is pointer to memory, where type of value is stored after successful return.
       Pointer can also be NULL and then nothing is stored. Type can be one of:

       CMAP_VALUETYPE_INT8 - 8-bit signed interger

       CMAP_VALUETYPE_UINT8 - 8-bit unsigned integer

       CMAP_VALUETYPE_INT16 - 16-bit signed interger

       CMAP_VALUETYPE_UINT16 - 16-bit unsigned integer

       CMAP_VALUETYPE_INT32 - 32-bit signed interger

       CMAP_VALUETYPE_UINT32 - 32-bit unsigned integer

       CMAP_VALUETYPE_INT64 - 64-bit signed interger

       CMAP_VALUETYPE_UINT64 - 64-bit unsigned integer

       CMAP_VALUETYPE_FLOAT - Float value

       CMAP_VALUETYPE_DOUBLE - Double value

       CMAP_VALUETYPE_STRING - C-style string

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

       Sortcut functions tests cmap type with it's own type. If type didn't match, CS_ERR_INVALID_PARAM error is
       returned. No conversions are done, so for example  cmap_get_int16  is  not  able  to  return  value  with
       CMAP_VALUETYPE_INT8 type.

       String shortcut function returns newly allocated memory and caller is responsible for freeing that.

RETURN VALUE

       This   call   returns   the   CS_OK   value   if  successful.  If  value  or  key_name  are  unspecified,
       CS_ERR_INVALID_PARAM is returned. Same error is also returned if value is specified,  and  *value_len  is
       too short for store of data. If key doesn't exists (it was not set by calling cmap_set(3) function first)
       CS_ERR_NOT_EXIST error is returned. For helper functions, CS_ERR_INVALID_PARAM is returned if type stored
       in cmap doesn't match with type of helper function.

SEE ALSO

       cmap_set(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

corosync Man Page                                  03/02/2012                                        CMAP_GET(3)