Mercurial > hg > xemacs-beta
annotate lisp/multicast.el @ 5250:db84c9d41437
Apply GIF colormap fix from Adam Sjogren for issues 150 and 713
| author | Vin Shelton <acs@xemacs.org> |
|---|---|
| date | Thu, 26 Aug 2010 22:45:58 -0400 |
| parents | 9058351b0236 |
| children | f00192e1cd49 91b3aa59f49b |
| rev | line source |
|---|---|
| 261 | 1 ;;; multicast.el --- lisp frontend for multicast connections in XEmacs |
| 2 | |
| 404 | 3 ;; Copyright (C) 1997-2000 Didier Verna. |
| 853 | 4 ;; Copyright (C) 2002 Ben Wing. |
| 261 | 5 |
| 404 | 6 ;; Author: Didier Verna <didier@xemacs.org> |
| 7 ;; Maintainer: Didier Verna <didier@xemacs.org> | |
| 8 ;; Created: Thu Dec 4 16:37:39 1997 | |
| 261 | 9 ;; Last Revision: Mon Jan 19 19:10:50 1998 |
| 10 ;; Current Version: 0.4 | |
| 11 ;; Keywords: dumped comm processes | |
| 12 | |
| 404 | 13 ;; This file is part of XEmacs. |
| 261 | 14 |
| 15 ;; XEmacs is free software; you can redistribute it and/or modify | |
| 16 ;; it under the terms of the GNU General Public License as published by | |
| 17 ;; the Free Software Foundation; either version 2 of the License, or | |
| 404 | 18 ;; (at your option) any later version. |
| 261 | 19 |
| 20 ;; XEmacs is distributed in the hope that it will be useful, | |
| 21 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 22 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 404 | 23 ;; GNU General Public License for more details. |
| 261 | 24 |
| 25 ;; You should have received a copy of the GNU General Public License | |
|
5235
9058351b0236
Fix up very old FSF address in three Lisp files.
Stephen J. Turnbull <stephen@xemacs.org>
parents:
853
diff
changeset
|
26 ;; along with XEmacs; see the file COPYING. If not, write to |
|
9058351b0236
Fix up very old FSF address in three Lisp files.
Stephen J. Turnbull <stephen@xemacs.org>
parents:
853
diff
changeset
|
27 ;; the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, |
|
9058351b0236
Fix up very old FSF address in three Lisp files.
Stephen J. Turnbull <stephen@xemacs.org>
parents:
853
diff
changeset
|
28 ;; Boston, MA 02110-1301, USA. |
| 261 | 29 |
| 30 ;;; Commentary: | |
| 31 | |
| 32 ;; This file just contains a lisp frontend to the internal function | |
| 33 ;; open-multicast-group-internal written in C and belonging to process.c | |
| 34 ;; Well, nothing much to say about it ... read the doc string. | |
| 35 | |
| 36 | |
| 37 ;;; Change Log: | |
| 38 | |
| 39 ;; Rev. of Mon Jan 19 19:04:44 1998 : packaging cleanup | |
| 40 ;; Rev. of Thu Dec 11 13:54:26 1997 : updated the docstring | |
| 41 ;; Rev. of Mon Dec 8 15:28:47 1997 : Improved the doc string | |
| 42 ;; Rev. of Thu Dec 4 16:38:09 1997 : Initial Version. | |
| 43 | |
| 44 | |
| 45 ;;; Code: | |
| 46 | |
| 47 (defun open-multicast-group (name buffer address) | |
| 48 "Open a multicast connection on the specified address. | |
| 444 | 49 Returns a process object to represent the connection. |
| 261 | 50 Input and output work as for subprocesses; `delete-process' closes it. |
| 51 NAME is a name for the process. It is modified if necessary to make it unique. | |
| 52 BUFFER is the buffer (or buffer-name) to associate with the process. | |
| 53 Process output goes at the end of that buffer, unless you specify an output | |
| 54 stream or filter function to handle the output. | |
| 55 BUFFER may be also nil, meaning that this process is not associated with any | |
| 853 | 56 buffer. |
| 261 | 57 ADDRESS specifies a standard multicast address \"dest/port/ttl\": |
| 58 dest is an internet address between 224.0.0.0 and 239.255.255.255 | |
| 59 port is a communication port like in traditional unicast | |
| 60 ttl is the time-to-live (15 for site, 63 for region and 127 for world). | |
| 61 | |
| 62 WARNING: it is *strongly* recommended to avoid using groups beginning with | |
| 404 | 63 224 or 239. Such groups are considered 'admin' groups, and may |
| 853 | 64 behave in a surprising way ... |
| 65 | |
| 66 The read/write coding systems used for process I/O on the process are | |
| 67 determined as follows: | |
| 68 | |
| 69 1. `coding-system-for-read', `coding-system-for-write', if non-nil. | |
| 70 (Intended as a temporary overriding mechanism for use by Lisp | |
| 71 code.) | |
| 72 2. The matching value for the port from `network-coding-system-alist', | |
| 73 if any, and if non-nil. The value may be either a single coding | |
| 74 system, used for both read and write; or a cons of read/write; or a | |
| 75 function, called to get one of the other two values. | |
| 76 3. The value of `default-network-coding-system', which should be a cons | |
| 77 of read/write coding systems, if the values are non-nil. | |
| 78 4. The coding system `undecided' for read, and `raw-text' for write. | |
| 79 | |
| 80 Note that the processes of determining the read and write coding systems | |
| 81 proceed essentially independently one from the other, as in `start-process'. | |
| 82 | |
| 83 You can change the coding systems later on using | |
| 84 `set-process-coding-system', `set-process-input-coding-system', or | |
| 85 `set-process-output-coding-system'." | |
| 261 | 86 (let (dest port ttl) |
| 87 ;; We check only the general form of the multicast address. | |
| 88 ;; The rest will be handled by the internal function. | |
| 89 (string-match "^\\([0-9\\.]+\\)/\\([0-9]+\\)/\\([0-9]+\\)$" address) | |
| 90 (and (not (and (= (match-beginning 0) 0) | |
| 91 (= (match-end 0) (length address)))) | |
| 92 (error "malformed multicast address: %s" address)) | |
| 93 (and (not (setq dest (match-string 1 address))) | |
| 94 (error "invalid destination specification.")) | |
| 95 (and (= 0 (setq port (string-to-int (match-string 2 address)))) | |
| 96 (error "invalid port specification.")) | |
| 97 (and (= 0 (setq ttl (string-to-int (match-string 3 address)))) | |
| 98 (error "invalid ttl specification.")) | |
| 853 | 99 (let (cs-r cs-w) |
| 100 (let (ret) | |
| 101 (catch 'found | |
| 102 (let ((alist network-coding-system-alist) | |
| 103 (case-fold-search nil) | |
| 104 pattern) | |
| 105 (while alist | |
| 106 (setq pattern (car (car alist))) | |
| 107 (and | |
| 108 (cond ((numberp pattern) | |
| 109 (and (numberp port) | |
| 110 (eq pattern port))) | |
| 111 ((stringp pattern) | |
| 112 (or (and (stringp port) | |
| 113 (string-match pattern port)) | |
| 114 (and (numberp port) | |
| 115 (string-match pattern | |
| 116 (number-to-string port)))))) | |
| 117 (throw 'found (setq ret (cdr (car alist))))) | |
| 118 (setq alist (cdr alist)) | |
| 119 ))) | |
| 120 (if (functionp ret) | |
| 121 (setq ret (funcall ret 'open-multicast-group port))) | |
| 122 (cond ((consp ret) | |
| 123 (setq cs-r (car ret) | |
| 124 cs-w (cdr ret))) | |
| 125 ((and ret (find-coding-system ret)) | |
| 126 (setq cs-r ret | |
| 127 cs-w ret)))) | |
| 128 (let ((coding-system-for-read | |
| 129 (or coding-system-for-read cs-r | |
| 130 (car default-network-coding-system) | |
| 131 'undecided)) | |
| 132 (coding-system-for-write | |
| 133 (or coding-system-for-write cs-w | |
| 134 (cdr default-network-coding-system) | |
| 135 'raw-text))) | |
| 136 (declare-fboundp (open-multicast-group-internal name buffer dest port | |
| 137 ttl)))))) | |
| 404 | 138 |
| 261 | 139 ;;; multicast.el ends here |