You can edit this page using wiki syntax for markup.

Article contents:== unveil This egg provides [[https://man.openbsd.org/unveil|unveil(2)]] support for CHICKEN on systems that provide it. {{unveil}} is a system call which allows the programmer to restrict a process's access to parts of the filesystem. [[toc:]] == Procedures <procedure>(unveil path perm-string) → unspecified</procedure> {{unveil}}s 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'': ; r : Make ''path'' available for read operations. ; w : Make ''path'' available for write operations. ; x : Make ''path'' available for execute operations. ; c : Allow ''path'' to be created and removed. This is equivalent to the C call {{unveil(path, perm-string)}}. See the {{unveil(2)}} [[https://man.openbsd.org/unveil|man page]] for more details. <procedure>(unveil-lock) → unspecified</procedure> Disable future calls to {{unveil}}. Any future calls will cause an error to be signaled. Equivalent to {{(unveil #f #f)}}. == Example 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)) == About This Egg === Maintainer Wolfgang Corcoran-Mathe <wcm at sigwinch dot xyzzy without the zy> === Dependencies None. === Repository [[https://github.com/Zipheir/unveil-chicken|GitHub]] === Version History ; 0.1 : Initial release (2020-11-20) ; 0.2 : Improved errors (2020-11-22) == License ISC License © 2020 Wolfgang Corcoran-Mathe Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. Description of your changes:

I would like to authenticate

Spam control

What do you get when you add 8 to 16?