Node:Low level options interfaces, Next:User level options interfaces, Up:Runtime Options

33.3.1 Low Level Options Interfaces

read-options-interface [setting]	Scheme Procedure
eval-options-interface [setting]	Scheme Procedure
print-options-interface [setting]	Scheme Procedure
debug-options-interface [setting]	Scheme Procedure
evaluator-traps-interface [setting]	Scheme Procedure
scm_read_options (setting)	C Function
scm_eval_options_interface (setting)	C Function
scm_print_options (setting)	C Function
scm_debug_options (setting)	C Function
scm_evaluator_traps (setting)	C Function

If one of these procedures is called with no arguments (or with setting == SCM_UNDEFINED in C code), it returns a list describing the current setting of the read, eval, print, debug or evaluator traps options respectively. The setting of a boolean option is indicated simply by the presence or absence of the option symbol in the list. The setting of a non-boolean option is indicated by the presence of the option symbol immediately followed by the option's current value. If called with a list argument, these procedures interpret the list as an option setting and modify the relevant options accordingly. [FIXME -- this glosses over a lot of details!] If called with any other argument, such as 'help, these procedures return a list of entries like (OPTION-SYMBOL DEFAULT-VALUE DOC-STRING), with each entry giving the default value and documentation for each option symbol in the relevant set of options.