3 * $Id: xwait.c,v 1.9 2002/01/13 14:44:59 mdw Exp $
5 * Wait until prodded by another X client
7 * (c) 1998 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of the Edgeware X tools collection.
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.
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.
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.
29 /*----- Revision history --------------------------------------------------*
32 * Revision 1.9 2002/01/13 14:44:59 mdw
33 * Make flags be unsigned.
35 * Revision 1.8 1999/08/20 07:29:55 mdw
36 * New command line syntax, and new atom protocol. Wait for multiple
37 * properties and listen for multiple (or all) values.
39 * Revision 1.7 1999/06/19 23:42:37 mdw
40 * Improve signal handling.
42 * Revision 1.6 1998/12/11 09:50:07 mdw
43 * Minor modifications to work with mLib and mgLib.
45 * Revision 1.5 1998/11/30 22:36:53 mdw
46 * Tidy up tabbing in help texts very slightly.
48 * Revision 1.4 1998/11/21 22:41:19 mdw
49 * Reap children which die before I get my signal handler installed.
51 * Revision 1.3 1998/11/21 22:30:27 mdw
52 * Support GNU-style long options throughout, and introduce proper help
53 * text to all programs. Update manual pages to match.
55 * Revision 1.2 1998/11/18 21:25:06 mdw
56 * Reap dead children as they arrive. The previous shell may have
57 * carelessly left them behind.
59 * Revision 1.1 1998/11/16 23:00:49 mdw
64 /*----- Header files ------------------------------------------------------*/
72 #include <sys/types.h>
77 #include <X11/Xutil.h>
79 #include <mLib/mdwopt.h>
80 #include <mLib/quis.h>
81 #include <mLib/report.h>
87 /*----- Data structures ---------------------------------------------------*/
89 typedef struct xwait_msg {
90 struct xwait_msg *next; /* Next message in the list */
91 Atom a; /* The message atom */
94 typedef struct xwait_atom {
95 struct xwait_atom *next; /* Next atom in the list */
96 Atom a; /* The actual atom */
97 xwait_msg *m; /* List of interesting messages */
100 /*----- Static variables --------------------------------------------------*/
102 static xwait_atom *atoms = 0;
105 /*----- Main code ---------------------------------------------------------*/
107 /* --- @sigchld@ --- */
109 static void sigchld(int sig)
112 while (waitpid(-1, 0, WNOHANG) > 0)
117 /* --- @opendisplay@ --- */
119 static void opendisplay(const char *d)
123 if ((dpy = XOpenDisplay(d)) == 0)
124 die(EXIT_FAILURE, "couldn't open display");
127 /* --- @addatom@ --- */
129 static xwait_atom *addatom(const char *a)
131 xwait_atom *xa = CREATE(xwait_atom);
134 xa->a = XInternAtom(dpy, a, False);
140 /* --- @addmsg@ --- */
142 static void addmsg(xwait_atom *xa, const char *a)
144 xwait_msg *xm = CREATE(xwait_msg);
147 xm->a = XInternAtom(dpy, a, False);
153 static void tidy(int sig)
156 int nsc = ScreenCount(dpy);
159 for (i = 0; i < nsc; i++) {
160 for (xa = atoms; xa; xa = xa->next)
161 XDeleteProperty(dpy, RootWindow(dpy, i), xa->a);
169 static void version(FILE *fp)
171 fprintf(fp, "%s (xtoys version " VERSION ")\n", QUIS);
174 static void usage(FILE *fp)
176 fprintf(fp, "Usage: %s [-f] [-d DISPLAY] [ATOM:MSG,MSG]...\n", QUIS);
179 int main(int argc, char *argv[])
189 /* --- Initialize mLib --- */
194 /* --- Parse options --- */
197 static struct option opt[] = {
198 { "help", 0, 0, 'h' },
199 { "usage", 0, 0, 'u' },
200 { "version", 0, 0, 'v' },
201 { "display", OPTF_ARGREQ, 0, 'd' },
202 { "atom", OPTF_ARGREQ, 0, 'a' },
203 { "msg", OPTF_ARGREQ, 0, 'm' },
204 { "force", 0, 0, 'f' },
208 int i = mdwopt(argc, argv, "d:a:m:f", opt, 0, 0, 0);
218 "Waits until signalled by `xtell' or `xshutdown'. Specifically, waits\n"
219 "until a property with name ATOM is written to the root window with\n"
224 "-h, --help Display this help text\n"
225 "-u, --usage Display a short usage summary\n"
226 "-v, --version Display the program's version number\n"
228 "-d, --display=DISPLAY Choose X display to connect to\n"
229 "-f, --force Run even if this property is waited for by another\n"
231 "-a, --atom=ATOM\t Choose property name to listen for [deprecated]\n"
232 "-m, --msg=MSG Choose value of property to wait for [deprecated]\n",
249 xa = addatom(optarg);
253 die(EXIT_FAILURE, "no atom currently defined");
266 /* --- Grind through remaining arguments in the new syntax --- */
268 while (optind < argc) {
269 char *p = strtok(argv[optind++], ":");
273 while ((p = strtok(0, ",")) != 0)
277 /* --- If there's nothing set, put in some defaults --- */
280 xa = addatom(XWAIT_DIE);
281 addmsg(xa, XWAIT_DIE_MSG);
284 /* --- Attach the atoms to the screens --- */
288 Atom ready = XInternAtom(dpy, "XWAIT_READY", False);
289 int nsc = ScreenCount(dpy);
291 /* --- First pass: make sure there's not a process already here --- */
293 if ((f & f_force) == 0) {
294 for (i = 0; i < nsc; i++) {
295 for (xa = atoms; xa; xa = xa->next) {
296 if (xatom_get(dpy, RootWindow(dpy, i), xa->a) != None)
297 die(EXIT_FAILURE, "already waiting for `%s'");
302 /* --- Second pass: set up listening to the property --- */
304 for (i = 0; i < nsc; i++) {
305 for (xa = atoms; xa; xa = xa->next)
306 xatom_set(dpy, RootWindow(dpy, i), xa->a, ready);
307 XSelectInput(dpy, RootWindow(dpy, i), PropertyChangeMask);
311 /* --- Set up a handler when children die --- *
313 * I don't fork any children? Why is this useful? Because I've been
314 * execed from a shell which started lots of background processes, and
315 * they'll zombie themselves otherwise.
321 sa.sa_handler = sigchld;
322 sigemptyset(&sa.sa_mask);
323 sigaddset(&sa.sa_mask, SIGCHLD);
324 sa.sa_flags = SA_NOCLDSTOP;
326 sa.sa_flags |= SA_RESTART;
328 sigaction(SIGCHLD, &sa, 0);
331 /* --- Now reap any which have been waiting around so far --- */
337 sigaddset(&ss, SIGCHLD);
338 sigprocmask(SIG_BLOCK, &ss, &oss);
340 sigprocmask(SIG_SETMASK, &oss, 0);
343 signal(SIGINT, tidy);
344 signal(SIGTERM, tidy);
346 /* --- Now wait for an event --- */
349 XNextEvent(dpy, &ev);
352 for (xa = atoms; xa; xa = xa->next) {
353 if (ev.xproperty.atom != xa->a)
355 a = xatom_get(dpy, ev.xproperty.window, xa->a);
360 for (xm = xa->m; xm; xm = xm->next) {
369 /* --- Finished: report the result if necessary --- */
373 fputs(XGetAtomName(dpy, xa->a), stdout);
374 if (!xa->m || xa->m->next)
375 printf(": %s\n", XGetAtomName(dpy, a));
378 } else if (!xa->m || xa->m->next)
379 printf("%s\n", XGetAtomName(dpy, a));
381 /* --- Go away --- */
387 /*----- That's all, folks -------------------------------------------------*/