90b2c5d4 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: xwait.c,v 1.1 1998/11/16 23:00:49 mdw Exp $ |
4 | * |
5 | * Wait until prodded by another X client |
6 | * |
7 | * (c) 1998 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of the Edgeware X tools collection. |
13 | * |
14 | * X tools is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * X tools is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with X tools; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: xwait.c,v $ |
32 | * Revision 1.1 1998/11/16 23:00:49 mdw |
33 | * Initial versions. |
34 | * |
35 | */ |
36 | |
37 | /*----- Header files ------------------------------------------------------*/ |
38 | |
39 | #include <stdio.h> |
40 | #include <stdlib.h> |
41 | #include <string.h> |
42 | |
43 | #include <unistd.h> |
44 | |
45 | #include <X11/Xlib.h> |
46 | #include <X11/Xutil.h> |
47 | |
48 | #include "xwait.h" |
49 | |
50 | /*----- Main code ---------------------------------------------------------*/ |
51 | |
52 | int main(int argc, char *argv[]) |
53 | { |
54 | char *display = 0; |
55 | Display *dpy; |
56 | Atom xwait_die; |
57 | XEvent ev; |
58 | char *atom = XWAIT_DIE; |
59 | char *msg = XWAIT_DIE_MSG; |
60 | unsigned f = 0; |
61 | |
62 | enum { |
63 | f_force = 1 |
64 | }; |
65 | |
66 | /* --- Parse options --- */ |
67 | |
68 | for (;;) { |
69 | int i = getopt(argc, argv, "d:a:m:f"); |
70 | if (i < 0) |
71 | break; |
72 | switch (i) { |
73 | case 'd': |
74 | display = optarg; |
75 | break; |
76 | case 'a': |
77 | atom = optarg; |
78 | break; |
79 | case 'm': |
80 | msg = optarg; |
81 | break; |
82 | case 'f': |
83 | f |= f_force; |
84 | break; |
85 | default: |
86 | fprintf(stderr, |
87 | "Usage: xwait [-f] [-d DISPLAY] [-a ATOM] [-m MSG]\n"); |
88 | exit(EXIT_FAILURE); |
89 | break; |
90 | } |
91 | } |
92 | |
93 | /* --- Connect to the X display --- */ |
94 | |
95 | dpy = XOpenDisplay(display); |
96 | if (!dpy) { |
97 | fprintf(stderr, "xwait: couldn't open display\n"); |
98 | exit(EXIT_FAILURE); |
99 | } |
100 | |
101 | /* --- Fetch the property name atom --- */ |
102 | |
103 | xwait_die = XInternAtom(dpy, atom, False); |
104 | |
105 | /* --- Mark ourselves as listening to all the screens --- */ |
106 | |
107 | { |
108 | int i; |
109 | int nsc = ScreenCount(dpy); |
110 | |
111 | /* --- First pass: make sure there's not a process already here --- */ |
112 | |
113 | if ((f & f_force) == 0) { |
114 | for (i = 0; i < nsc; i++) { |
115 | Window win = RootWindow(dpy, i); |
116 | XTextProperty prop; |
117 | |
118 | if (XGetTextProperty(dpy, win, &prop, xwait_die)) { |
119 | fprintf(stderr, "xwait: already waiting for `%s'\n", atom); |
120 | exit(EXIT_FAILURE); |
121 | } |
122 | } |
123 | } |
124 | |
125 | /* --- Second pass: set up listening to the property --- */ |
126 | |
127 | for (i = 0; i < nsc; i++) { |
128 | Window win = RootWindow(dpy, i); |
129 | XTextProperty prop; |
130 | char *imsg = "XWAIT_READY"; |
131 | |
132 | XStringListToTextProperty(&imsg, 1, &prop); |
133 | XSetTextProperty(dpy, win, &prop, xwait_die); |
134 | XSelectInput(dpy, win, PropertyChangeMask); |
135 | } |
136 | } |
137 | |
138 | /* --- Now wait for an event --- */ |
139 | |
140 | for (;;) { |
141 | XNextEvent(dpy, &ev); |
142 | switch (ev.type) { |
143 | case PropertyNotify: |
144 | if (ev.xproperty.atom == xwait_die) { |
145 | XTextProperty prop; |
146 | char **sl; |
147 | int c; |
148 | |
149 | if (XGetTextProperty(dpy, ev.xproperty.window, &prop, xwait_die)) { |
150 | XTextPropertyToStringList(&prop, &sl, &c); |
151 | if (strcmp(sl[0], msg) == 0) |
152 | goto exit; |
153 | XFreeStringList(sl); |
154 | } |
155 | } |
156 | } |
157 | } |
158 | |
159 | /* --- Finished: remove the property from all the screens --- */ |
160 | |
161 | exit: |
162 | { |
163 | int i; |
164 | int nsc = ScreenCount(dpy); |
165 | |
166 | for (i = 0; i < nsc; i++) |
167 | XDeleteProperty(dpy, RootWindow(dpy, i), xwait_die); |
168 | } |
169 | |
170 | /* --- Go away --- */ |
171 | |
172 | XCloseDisplay(dpy); |
173 | return (0); |
174 | } |
175 | |
176 | /*----- That's all, folks -------------------------------------------------*/ |