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gethostname.lisp (2112B) | |
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1 ;;;; -*- Mode: lisp; indent-tabs-mode: nil -*- | |
2 ;;; | |
3 ;;; gethostname.lisp --- A simple CFFI example. | |
4 ;;; | |
5 ;;; Copyright (C) 2005-2006, James Bielman <[email protected]> | |
6 ;;; | |
7 ;;; Permission is hereby granted, free of charge, to any person | |
8 ;;; obtaining a copy of this software and associated documentation | |
9 ;;; files (the "Software"), to deal in the Software without | |
10 ;;; restriction, including without limitation the rights to use, copy, | |
11 ;;; modify, merge, publish, distribute, sublicense, and/or sell copies | |
12 ;;; of the Software, and to permit persons to whom the Software is | |
13 ;;; furnished to do so, subject to the following conditions: | |
14 ;;; | |
15 ;;; The above copyright notice and this permission notice shall be | |
16 ;;; included in all copies or substantial portions of the Software. | |
17 ;;; | |
18 ;;; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
19 ;;; EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
20 ;;; MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
21 ;;; NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT | |
22 ;;; HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, | |
23 ;;; WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
24 ;;; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
25 ;;; DEALINGS IN THE SOFTWARE. | |
26 ;;; | |
27 | |
28 ;;;# CFFI Example: gethostname binding | |
29 ;;; | |
30 ;;; This is a very simple CFFI example that illustrates calling a C | |
31 ;;; function that fills in a user-supplied string buffer. | |
32 | |
33 (defpackage #:cffi-example-gethostname | |
34 (:use #:common-lisp #:cffi) | |
35 (:export #:gethostname)) | |
36 | |
37 (in-package #:cffi-example-gethostname) | |
38 | |
39 ;;; Define the Lisp function %GETHOSTNAME to call the C 'gethostname' | |
40 ;;; function, which will fill BUF with up to BUFSIZE characters of the | |
41 ;;; system's hostname. | |
42 (defcfun ("gethostname" %gethostname) :int | |
43 (buf :pointer) | |
44 (bufsize :int)) | |
45 | |
46 ;;; Define a Lispy interface to 'gethostname'. The utility macro | |
47 ;;; WITH-FOREIGN-POINTER-AS-STRING is used to allocate a temporary | |
48 ;;; buffer and return it as a Lisp string. | |
49 (defun gethostname () | |
50 (with-foreign-pointer-as-string ((buf bufsize) 255) | |
51 (%gethostname buf bufsize))) |