sam_data_restore man page
sam_data_restore — Restore previously saved user data
cs_error_t sam_data_restore (void *data, size_t size);
The sam_data_restore function is used to restore data, previously saved by calling sam_data_store(3). Such data survives between instances.
The data parameter is pointer to memory initialized by caller. Stored data are copied there. This also means, that caller is responsible for freeing memory.
The size parameter is length of data. This one must be at least same length as previously stored data otherwise error is returned. Parameter can be larger but only stored data size bytes are changed.
Use sam_data_getsize(3) to find out length of stored data.
This call return CS_OK value if successful, otherwise and error is returned.
component was not initialized by calling sam_initialize(3) or it was finalized.
data parameter is NULL or size is less then currently stored data length
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
sam_data_getsize(3), sam_data_store(3), sam_overview(8).