NAME

       cmap_get - Retrieve 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 retrieve 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 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_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

       Shortcut  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 interrupted by a signal

       CS_ERR_NOT_SUPPORTED The requested protocol/functionality not supported

       CS_ERR_MESSAGE_ERROR Incorrect auth message received

       CS_ERR_NO_MEMORY Not enough memory to complete the requested task