- unveil path perm-stringprocedure
unveils the path denoted by the string path using the permissions described by perm-string. This hides all parts of the filesystem from further filesystem-related operations, except for the specified path.
perm-string is a string of zero or more of the following characters giving the indicated permissions on path:
- Make path available for read operations.
- Make path available for write operations.
- Make path available for execute operations.
- Allow path to be created and removed.
This is equivalent to the C call unveil(path, perm-string). See the unveil(2) man page for more details.
Disable future calls to unveil. Any future calls will cause an error to be signaled. Equivalent to (unveil #f #f).
The following restricts the process to read/write access to the current directory only. It is wrapped in a cond-expand which ensures that it is only executed if unveil(2) support is available (currently, only on OpenBSD).
(import (chicken process-context)) (cond-expand (openbsd (begin (import (unveil)) (unveil (current-directory) "rw") (unveil-lock))) (else #t))
Wolfgang Corcoran-Mathe <wcm at sigwinch dot xyzzy without the zy>
- Initial release (2020-11-20)
- Improved errors (2020-11-22)
© 2020 Wolfgang Corcoran-Mathe
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