char *capng_print_caps_text(capng_print_t where, capng_type_t which);
capng_print_caps_text will create a text string representation of the internal capability set specified. The representation can be sent to either stdout or a buffer by passing CAPNG_PRINT_STDOUT or CAPNG_PRINT_BUFFER respectively for the where parameter. If the option was for a buffer, this function will malloc a buffer that the caller must free.
The legal values for the which paramemeter is CAPNG_EFFECTIVE, CAPNG_PERMITTED, CAPNG_INHERITABLE, or CAPNG_BOUNDING_SET.
If CAPNG_PRINT_BUFFER was selected for where, this will be the text buffer and NULL on failure. If CAPNG_PRINT_STDOUT was selected then this value will be NULL no matter what.