Flags and Hooks

These flags and hooks are availble when MzScheme is used as an embedded interpreter:

• scheme_exit -- This pointer can be set to a function which takes an integer argument and returns void; the function will be used as the default exit handler. The default is NULL.
• scheme_console_printf -- This pointer can be set to a function that takes arguments like printf; the function will be called to display internal MzScheme warnings and messages. The default is NULL.
• scheme_check_for_break -- This points to a function of no arguments that returns an integer. It is used as the default user-break polling procedure in the main thread. (A non-zero return value indicates a user break.) The default is NULL.
• scheme_make_stdin, scheme_make_stdout, scheme_make_stderr, -- These pointers can be set to a function that takes no arguments and returns a Scheme port Scheme_Object * to be used as the starting standard input, output, and/or error port. The defaults are NULL.
• scheme_case_sensitive -- If this flag is set to a non-zero value before scheme_basic_env is called, then MzScheme will not ignore capitalization for synbols and global variable names. The value of this flag should not change once it is set. The default is zero.
• scheme_constant_builtins -- If this flag is set to a non-zero value before scheme_basic_env is called, then the standard MzScheme functions and syntax will be defined as constant globals. The default is zero.
• scheme_no_keywords -- If this flag is set to a non-zero value before scheme_basic_env is called, then no keywords are enforced; i.e., the names of the core syntactic forms and all ``#%'' names are available for local variable names. The default is zero.
• scheme_allow_set_undefined -- This flag determines the initial value of compile-allow-set!-undefined. The default is zero.
• scheme_allow_cond_auto_else -- This flag determines the initial value of compile-allow-cond-fallthrough. The default is non-zero.
• scheme_secure_primitive_exn -- If this flag is set to non-zero, then the structure type values and constructors for the primitive exception types will not be defined as global variables. The default is zero.
• scheme_escape_continuations_only -- If this flag is set to a non-zero value before scheme_basic_env is called, then call/cc will be remapped to call/ec; this is useful for speeding up Scheme evaluation when continuations are only used for escaping. The default is zero.