| ;;; examples/safe/evil.scm -- Evil Scheme file to be run in a safe | |
| ;;; environment. | |
| ;;; Commentary: | |
| ;;; This is an example file to be evaluated by the `safe' program in | |
| ;;; this directory. This program, unlike the `untrusted.scm' (which | |
| ;;; is untrusted, but a really nice fellow though), tries to do evil | |
| ;;; things and will thus break in a safe environment. | |
| ;;; | |
| ;;; *Note* that the files in this directory are only suitable for | |
| ;;; demonstration purposes, if you have to implement safe evaluation | |
| ;;; mechanisms in important environments, you will have to do more | |
| ;;; than shown here -- for example disabling input/output operations. | |
| ;;; Author: Martin Grabmueller | |
| ;;; Date: 2001-05-30 | |
| ;;; Code: | |
| (define passwd (open-input-file "/etc/passwd")) | |
| (let lp ((ch (read-char passwd))) | |
| (if (not (eof-object? ch)) | |
| (lp (read-char passwd)))) | |
| ;;; End of file. | |