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1 | /* -*-c-*- |
2 | * |
47747dbe |
3 | * $Id: xwait.c,v 1.10 2004/04/08 01:36:29 mdw Exp $ |
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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 | |
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29 | /*----- Header files ------------------------------------------------------*/ |
30 | |
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31 | #include <errno.h> |
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32 | #include <signal.h> |
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33 | #include <stdio.h> |
34 | #include <stdlib.h> |
35 | #include <string.h> |
36 | |
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37 | #include <sys/types.h> |
38 | #include <sys/wait.h> |
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39 | #include <unistd.h> |
40 | |
41 | #include <X11/Xlib.h> |
42 | #include <X11/Xutil.h> |
43 | |
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44 | #include <mLib/mdwopt.h> |
45 | #include <mLib/quis.h> |
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46 | #include <mLib/report.h> |
47 | #include <mLib/sub.h> |
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48 | |
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49 | #include "xatom.h" |
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50 | #include "xwait.h" |
51 | |
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52 | /*----- Data structures ---------------------------------------------------*/ |
53 | |
54 | typedef struct xwait_msg { |
55 | struct xwait_msg *next; /* Next message in the list */ |
56 | Atom a; /* The message atom */ |
57 | } xwait_msg; |
58 | |
59 | typedef struct xwait_atom { |
60 | struct xwait_atom *next; /* Next atom in the list */ |
61 | Atom a; /* The actual atom */ |
62 | xwait_msg *m; /* List of interesting messages */ |
63 | } xwait_atom; |
64 | |
65 | /*----- Static variables --------------------------------------------------*/ |
66 | |
67 | static xwait_atom *atoms = 0; |
68 | static Display *dpy; |
69 | |
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70 | /*----- Main code ---------------------------------------------------------*/ |
71 | |
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72 | /* --- @sigchld@ --- */ |
73 | |
74 | static void sigchld(int sig) |
75 | { |
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76 | int e = errno; |
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77 | while (waitpid(-1, 0, WNOHANG) > 0) |
78 | ; |
7b50dab0 |
79 | errno = e; |
203d0643 |
80 | } |
81 | |
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82 | /* --- @opendisplay@ --- */ |
83 | |
84 | static void opendisplay(const char *d) |
85 | { |
86 | if (dpy) |
87 | return; |
88 | if ((dpy = XOpenDisplay(d)) == 0) |
89 | die(EXIT_FAILURE, "couldn't open display"); |
90 | } |
91 | |
92 | /* --- @addatom@ --- */ |
93 | |
94 | static xwait_atom *addatom(const char *a) |
95 | { |
96 | xwait_atom *xa = CREATE(xwait_atom); |
97 | opendisplay(0); |
98 | xa->next = atoms; |
99 | xa->a = XInternAtom(dpy, a, False); |
100 | xa->m = 0; |
101 | atoms = xa; |
102 | return (xa); |
103 | } |
104 | |
105 | /* --- @addmsg@ --- */ |
106 | |
107 | static void addmsg(xwait_atom *xa, const char *a) |
108 | { |
109 | xwait_msg *xm = CREATE(xwait_msg); |
110 | opendisplay(0); |
111 | xm->next = xa->m; |
112 | xm->a = XInternAtom(dpy, a, False); |
113 | xa->m = xm; |
114 | } |
115 | |
116 | /* --- @tidy@ --- */ |
117 | |
118 | static void tidy(int sig) |
119 | { |
120 | int i; |
121 | int nsc = ScreenCount(dpy); |
122 | xwait_atom *xa; |
123 | |
124 | for (i = 0; i < nsc; i++) { |
125 | for (xa = atoms; xa; xa = xa->next) |
126 | XDeleteProperty(dpy, RootWindow(dpy, i), xa->a); |
127 | } |
128 | XCloseDisplay(dpy); |
129 | exit(0); |
130 | } |
131 | |
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132 | /* --- @main@ --- */ |
133 | |
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134 | static void version(FILE *fp) |
135 | { |
136 | fprintf(fp, "%s (xtoys version " VERSION ")\n", QUIS); |
137 | } |
138 | |
139 | static void usage(FILE *fp) |
140 | { |
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141 | fprintf(fp, "Usage: %s [-f] [-d DISPLAY] [ATOM:MSG,MSG]...\n", QUIS); |
f3b35b6b |
142 | } |
143 | |
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144 | int main(int argc, char *argv[]) |
145 | { |
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146 | Atom a; |
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147 | XEvent ev; |
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148 | unsigned f = 0; |
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149 | xwait_atom *xa = 0; |
150 | xwait_msg *xm = 0; |
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151 | |
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152 | #define f_force 1u |
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153 | |
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154 | /* --- Initialize mLib --- */ |
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155 | |
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156 | ego(argv[0]); |
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157 | sub_init(); |
158 | |
159 | /* --- Parse options --- */ |
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160 | |
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161 | for (;;) { |
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162 | static struct option opt[] = { |
163 | { "help", 0, 0, 'h' }, |
164 | { "usage", 0, 0, 'u' }, |
165 | { "version", 0, 0, 'v' }, |
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166 | { "display", OPTF_ARGREQ, 0, 'd' }, |
167 | { "atom", OPTF_ARGREQ, 0, 'a' }, |
168 | { "msg", OPTF_ARGREQ, 0, 'm' }, |
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169 | { "force", 0, 0, 'f' }, |
170 | { 0, 0, 0, 0 } |
171 | }; |
172 | |
fa64e430 |
173 | int i = mdwopt(argc, argv, "huvd:a:m:f", opt, 0, 0, 0); |
90b2c5d4 |
174 | if (i < 0) |
175 | break; |
176 | switch (i) { |
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177 | case 'h': |
178 | version(stdout); |
179 | fputs("\n", stdout); |
180 | usage(stdout); |
181 | fputs( |
182 | "\n" |
183 | "Waits until signalled by `xtell' or `xshutdown'. Specifically, waits\n" |
184 | "until a property with name ATOM is written to the root window with\n" |
185 | "contents MSG.\n" |
186 | "\n" |
187 | "Options:\n" |
188 | "\n" |
189 | "-h, --help Display this help text\n" |
190 | "-u, --usage Display a short usage summary\n" |
191 | "-v, --version Display the program's version number\n" |
192 | "\n" |
193 | "-d, --display=DISPLAY Choose X display to connect to\n" |
194 | "-f, --force Run even if this property is waited for by another\n" |
195 | " process\n" |
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196 | "-a, --atom=ATOM\t Choose property name to listen for [deprecated]\n" |
197 | "-m, --msg=MSG Choose value of property to wait for [deprecated]\n", |
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198 | stdout); |
199 | exit(0); |
200 | break; |
201 | case 'u': |
202 | usage(stdout); |
203 | exit(0); |
204 | break; |
205 | case 'v': |
206 | version(stdout); |
207 | exit(0); |
208 | break; |
209 | |
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210 | case 'd': |
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211 | opendisplay(optarg); |
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212 | break; |
213 | case 'a': |
25c93171 |
214 | xa = addatom(optarg); |
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215 | break; |
216 | case 'm': |
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217 | if (!xa) |
218 | die(EXIT_FAILURE, "no atom currently defined"); |
219 | addmsg(xa, optarg); |
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220 | break; |
221 | case 'f': |
222 | f |= f_force; |
223 | break; |
224 | default: |
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225 | usage(stderr); |
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226 | exit(EXIT_FAILURE); |
227 | break; |
228 | } |
229 | } |
230 | |
25c93171 |
231 | /* --- Grind through remaining arguments in the new syntax --- */ |
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232 | |
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233 | while (optind < argc) { |
234 | char *p = strtok(argv[optind++], ":"); |
235 | if (!p) |
236 | continue; |
237 | xa = addatom(p); |
238 | while ((p = strtok(0, ",")) != 0) |
239 | addmsg(xa, p); |
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240 | } |
241 | |
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242 | /* --- If there's nothing set, put in some defaults --- */ |
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243 | |
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244 | if (!atoms) { |
245 | xa = addatom(XWAIT_DIE); |
246 | addmsg(xa, XWAIT_DIE_MSG); |
247 | } |
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248 | |
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249 | /* --- Attach the atoms to the screens --- */ |
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250 | |
251 | { |
252 | int i; |
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253 | Atom ready = XInternAtom(dpy, "XWAIT_READY", False); |
90b2c5d4 |
254 | int nsc = ScreenCount(dpy); |
255 | |
256 | /* --- First pass: make sure there's not a process already here --- */ |
257 | |
258 | if ((f & f_force) == 0) { |
259 | for (i = 0; i < nsc; i++) { |
25c93171 |
260 | for (xa = atoms; xa; xa = xa->next) { |
261 | if (xatom_get(dpy, RootWindow(dpy, i), xa->a) != None) |
262 | die(EXIT_FAILURE, "already waiting for `%s'"); |
90b2c5d4 |
263 | } |
264 | } |
265 | } |
266 | |
267 | /* --- Second pass: set up listening to the property --- */ |
268 | |
269 | for (i = 0; i < nsc; i++) { |
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270 | for (xa = atoms; xa; xa = xa->next) |
271 | xatom_set(dpy, RootWindow(dpy, i), xa->a, ready); |
272 | XSelectInput(dpy, RootWindow(dpy, i), PropertyChangeMask); |
90b2c5d4 |
273 | } |
274 | } |
275 | |
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276 | /* --- Set up a handler when children die --- * |
277 | * |
278 | * I don't fork any children? Why is this useful? Because I've been |
279 | * execed from a shell which started lots of background processes, and |
280 | * they'll zombie themselves otherwise. |
281 | */ |
282 | |
283 | { |
284 | struct sigaction sa; |
285 | |
286 | sa.sa_handler = sigchld; |
287 | sigemptyset(&sa.sa_mask); |
288 | sigaddset(&sa.sa_mask, SIGCHLD); |
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289 | sa.sa_flags = SA_NOCLDSTOP; |
290 | #ifdef SA_RESTART |
291 | sa.sa_flags |= SA_RESTART; |
292 | #endif |
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293 | sigaction(SIGCHLD, &sa, 0); |
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294 | } |
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295 | |
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296 | /* --- Now reap any which have been waiting around so far --- */ |
297 | |
298 | { |
299 | sigset_t ss, oss; |
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300 | |
301 | sigemptyset(&ss); |
302 | sigaddset(&ss, SIGCHLD); |
303 | sigprocmask(SIG_BLOCK, &ss, &oss); |
304 | sigchld(SIGCHLD); |
305 | sigprocmask(SIG_SETMASK, &oss, 0); |
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306 | } |
307 | |
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308 | signal(SIGINT, tidy); |
309 | signal(SIGTERM, tidy); |
310 | |
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311 | /* --- Now wait for an event --- */ |
312 | |
313 | for (;;) { |
314 | XNextEvent(dpy, &ev); |
315 | switch (ev.type) { |
316 | case PropertyNotify: |
25c93171 |
317 | for (xa = atoms; xa; xa = xa->next) { |
318 | if (ev.xproperty.atom != xa->a) |
319 | continue; |
320 | a = xatom_get(dpy, ev.xproperty.window, xa->a); |
321 | if (a == None) |
322 | continue; |
323 | if (xa->m == 0) |
324 | goto exit; |
325 | for (xm = xa->m; xm; xm = xm->next) { |
326 | if (a == xm->a) |
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327 | goto exit; |
90b2c5d4 |
328 | } |
329 | } |
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330 | break; |
90b2c5d4 |
331 | } |
332 | } |
333 | |
25c93171 |
334 | /* --- Finished: report the result if necessary --- */ |
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335 | |
336 | exit: |
25c93171 |
337 | if (atoms->next) { |
338 | fputs(XGetAtomName(dpy, xa->a), stdout); |
339 | if (!xa->m || xa->m->next) |
340 | printf(": %s\n", XGetAtomName(dpy, a)); |
341 | else |
342 | fputc('\n', stdout); |
343 | } else if (!xa->m || xa->m->next) |
344 | printf("%s\n", XGetAtomName(dpy, a)); |
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345 | |
346 | /* --- Go away --- */ |
347 | |
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348 | tidy(0); |
90b2c5d4 |
349 | return (0); |
350 | } |
351 | |
352 | /*----- That's all, folks -------------------------------------------------*/ |