Misc.

system string

STKLOS Procedure

Sends the given string to the system shell /bin/sh. The result of system is the integer status code the shell returns.

exec str	STKLOS Procedure
exec-list str	STKLOS Procedure

These procedures execute the command given in str. The command given in str is passed to /bin/sh. Exec returns a strings which contains all the characters that the command str has printed on it's standard output, whereas exec-list returns a list of the lines which constitute the output of str. (exec "echo A; echo B") => "A\nB\n" (exec-list "echo A; echo B") => ("A" "B")

exit	STKLOS Procedure
exit ret-code	STKLOS Procedure

Exits the program with the specified integer return code. If ret-code is omitted, the program terminates with a return code of 0.

die message	STKLOS Procedure
die message status	STKLOS Procedure

Die prints the given message on the current error port and exits the program with the status value. If status is omitted, it defaults to 1.

address-of obj

R5RS

Returns the address of the object obj as an integer.

gc

R5RS

Returns the address of the object obj as an integer.

void	STKLOS Procedure
void arg1 ...	STKLOS Procedure

Returns the special void object. If arguments are passed to void, they are evalued and simply ignored.

error str obj ...	STKLOS Procedure
error name str obj ...	STKLOS Procedure

error is used to signal an error to the user. The second form of error takes a symbol as first parameter; it is generally used for the name of the procedure which raises the error. Note: The specification string may follow the "tilde conventions" of format (see format); in this case this procedure builds an error message according to the specification given in str. Otherwise, this procedure is conform to the error procedure defined in SRFI-23 and str is printed with the display procedure, whereas the objs are printed with the write procedure. Hereafter, are some calls of the error procedure using a formatted string (error "bad integer ~A" "a") -| bad integer a (error 'vector-ref "bad integer ~S" "a") -| vector-ref: bad integer "a" (error 'foo "~A is not between ~A and ~A" "bar" 0 5) -| foo: bar is not between 0 and 5 and some conform to SRFI-23 (error "bad integer" "a") -| bad integer "a" (error 'vector-ref "bad integer" "a") -| vector-ref: bad integer "a" (error "bar" "is not between" 0 "and" 5) -| bar "is not between" 0 "and" 5

apropos obj	STKLOS Procedure
apropos obj module	STKLOS Procedure

Apropos returns a list of symbols whose print name contains the characters of obj as a substring . The given obj can be a string or symbol. This function returns the list of matched symbols which can be accessed from the given module (defaults to the current module if not provided).

trace f-name ...

STKLOS Syntax

Invoking trace with one or more function names causes the functions named to be traced. Henceforth, whenever such a function is invoked, information about the call and the returned values, if any, will be printed on the current error port. Calling trace with no argument returns the list of traced functions.

untrace f-name ...

STKLOS Syntax

Invoking untrace with one or more function names causes the functions named not to be traced anymore. Calling untrace with no argument will print the list of traced functions on the current error port.

pretty-print sexpr :key port width	STKLOS Procedure
pp sexpr :key port width	STKLOS Procedure

This function tries to obtain a pretty-printed representation of sexpr. The pretty-printed form is written on port with lines which are no more long than width characters. If port is omitted if defaults to the current error port. As a special convention, if port is #t, output goes to the current output port and if port is #f, the output is returned as a string by pretty-print. Note that pp is another name for pretty-print.