Thanks for the tip Eli, that seems like what I'm looking for. I can't actually figure out how to use it for files though; when I write -------------------- (make-evaluator 'racket (string->path "aplusb.scm")) -------------------- I get the error message -------------------- open-input-file: `read' access denied for aplusb.scm" -------------------- even though I definitely have read access to this file. If I try -------------------- (define aplusb (open-input-file "aplusb.scm")) (make-evaluator 'racket aplusb) -------------------- then the error message is -------------------- exception raised by error display handler: directory-exists?: `exists' access denied for /; original exception raised: module: illegal use (not at top-level) -------------------- It works fine when I give the second argument as a string or an s-expression but that wouldn't work well for the intended application. Have I misunderstood the documentation? <div class="gmail_quote">On Fri, Sep 17, 2010 at 4:32 AM, bbi5291 <<a href="mailto:bbi5291@gmail.com">bbi5291@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">Consider the simple Racket program -------------------- #lang racket (+ (read) (read)) -------------------- When this is compiled using raco, the executable produced works exactly as intended, reading two integers on standard input and printing their sum. However, when I run the C program -------------------- #include <unistd.h> int main() { execl("aplusb","aplusb",(char*)0); } -------------------- where "aplusb" is the name of the Racket program, it exits immediately with the errors: -------------------- with-input-from-file: expects type <path or string> as 1st argument, given: #f; other arguments were: #<procedure> === context === embedded-load -------------------- How can I fix this problem? I am using Racket v5.0.1 on Ubuntu 9.10 (i386). </blockquote></div>