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All functions return -1 if an error occurs. Typically, the functions will return 0 on success, but the data exchange functions (cs_get, cs_put, cs_more) follow special rules. Consult their descriptions.
When a function (including the data exchange functions) reports an error condition, use the function cs_errno() to determine the cause of the problem. The function
works like perror(2) and prints the message argument, along with a system message, to stderr. Use the character array
to get hold of the message, if you want to process it differently. The function
Returns an error message from the lower layer, if one has been provided.