1/* Part of XPCE --- The SWI-Prolog GUI toolkit 2 3 Author: Jan Wielemaker and Anjo Anjewierden 4 E-mail: jan@swi.psy.uva.nl 5 WWW: http://www.swi.psy.uva.nl/projects/xpce/ 6 Copyright (c) 2002-2011, University of Amsterdam 7 All rights reserved. 8 9 Redistribution and use in source and binary forms, with or without 10 modification, are permitted provided that the following conditions 11 are met: 12 13 1. Redistributions of source code must retain the above copyright 14 notice, this list of conditions and the following disclaimer. 15 16 2. Redistributions in binary form must reproduce the above copyright 17 notice, this list of conditions and the following disclaimer in 18 the documentation and/or other materials provided with the 19 distribution. 20 21 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 29 CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 31 ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 32 POSSIBILITY OF SUCH DAMAGE. 33*/ 34 35:- module('Xserver', 36 [ ensure_x_server/2 % +Display, +Depth 37 ]). 38:- use_module(library(pce)). 39 40 41%! ensure_x_server(+Display, +Depth) 42% 43% Ensure the existence of a graphics environment for XPCE. This 44% library uses the `head-less' server Xvfb if there is no X-server 45% in the environment. 46% 47% Currently this library deals with Windows (where no explicit 48% server is required) and Xfree using the Xfree socket naming 49% conventions. Please send platform-specific code to 50% info@swi-prolog.org 51 52ensure_x_server(_Display, _) :- 53 current_prolog_flag(windows, true), 54 !. % we have a display 55ensure_x_server(_Display, _) :- 56 getenv('DISPLAY', _), 57 !. % Existing X11 display 58ensure_x_server(Display, _) :- 59 atom_concat('/tmp/.X11-unix/X', Display, Socket), 60 catch(open(Socket, read, In), _, fail), 61 close(In), 62 export_environment(Display). 63ensure_x_server(Display, Depth) :- 64 print_message(informational, pce(xserver(start_Xvfb(Display, Depth)))), 65 xauthority(Display, Auth), 66 xlog(Display, Log), 67 mcookie(Cookie), 68 ignore(catch(delete_file(Auth), _, true)), 69 sformat(Cmd1, '/usr/bin/X11/xauth -f ~w add :~w . ~s > ~w 2>&1', 70 [ Auth, Display, Cookie, Log ]), 71 shell(Cmd1), 72 sformat(Cmd2, 'nohup /usr/bin/X11/Xvfb :~w -auth ~w -screen 0 640x480x~w >> ~w &', 73 [ Display, Auth, Depth, Log ]), 74 shell(Cmd2), 75 sleep(5), 76 export_environment(Display). 77 (Display, Auth) :- 79 atomic_list_concat(['/tmp/.X', Display, 'Authority'], Auth). 80xlog(Display, Log) :- 81 atomic_list_concat(['/tmp/.X', Display, 'Log'], Log). 82 (Cookie) :- 84 open(pipe(mcookie), read, Stream), 85 read_line_to_codes(Stream, Cookie). 86 87export_environment(Display) :- 88 xauthority(Display, Auth), 89 atom_concat(':', Display, Address), 90 setenv('DISPLAY', Address), 91 setenv('XAUTHORITY', Auth). 92 93 /******************************* 94 * MESSAGES * 95 *******************************/ 96:- multifile 97 prolog:message/3. 98 99% Catch messages. sgml/4 is generated by the SGML2PL binding. 100 101prologmessage(pce(xserver(start_Xvfb(Display, Depth)))) --> 102 [ 'XPCE: Starting Xvfb on display ~w using depth ~w'-[Display, Depth] 103 ]