[racket] Setting umask from within Racket

Hello everyone,

Is there a way to set the umask of the process from within Racket? Or to
specify the mode of a newly created file? I've been looking through the
documentation, but I'm not finding anything along these lines. I was hoping
that I could do something like the following from within my program:

(parameterize ([umask #o007])
  (display-to-file 5 "test-file"))

Or like this:

(display-to-file 5 "test-file" #:perms #o660)

I could change the permissions of the file with
file-or-directory-permissions after creating the file, but what I really
want to do is create the file with those permissions from the start. Is
there a good way to accomplish this? Am I missing something in the
documentation?

Thanks!

- Cody
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