606321a61538c2392426b449f20df384c59be29d
3 * $Id: xwait.c,v 1.10 2004/04/08 01:36:29 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 /*----- Header files ------------------------------------------------------*/
37 #include <sys/types.h>
42 #include <X11/Xutil.h>
44 #include <mLib/mdwopt.h>
45 #include <mLib/quis.h>
46 #include <mLib/report.h>
52 /*----- Data structures ---------------------------------------------------*/
54 typedef struct xwait_msg
{
55 struct xwait_msg
*next
; /* Next message in the list */
56 Atom a
; /* The message atom */
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 */
65 /*----- Static variables --------------------------------------------------*/
67 static xwait_atom
*atoms
= 0;
70 /*----- Main code ---------------------------------------------------------*/
72 /* --- @sigchld@ --- */
74 static void sigchld(int sig
)
77 while (waitpid(-1, 0, WNOHANG
) > 0)
82 /* --- @opendisplay@ --- */
84 static void opendisplay(const char *d
)
88 if ((dpy
= XOpenDisplay(d
)) == 0)
89 die(EXIT_FAILURE
, "couldn't open display");
92 /* --- @addatom@ --- */
94 static xwait_atom
*addatom(const char *a
)
96 xwait_atom
*xa
= CREATE(xwait_atom
);
99 xa
->a
= XInternAtom(dpy
, a
, False
);
105 /* --- @addmsg@ --- */
107 static void addmsg(xwait_atom
*xa
, const char *a
)
109 xwait_msg
*xm
= CREATE(xwait_msg
);
112 xm
->a
= XInternAtom(dpy
, a
, False
);
118 static void tidy(int sig
)
121 int nsc
= ScreenCount(dpy
);
124 for (i
= 0; i
< nsc
; i
++) {
125 for (xa
= atoms
; xa
; xa
= xa
->next
)
126 XDeleteProperty(dpy
, RootWindow(dpy
, i
), xa
->a
);
134 static void version(FILE *fp
)
136 fprintf(fp
, "%s (xtoys version " VERSION
")\n", QUIS
);
139 static void usage(FILE *fp
)
141 fprintf(fp
, "Usage: %s [-f] [-d DISPLAY] [ATOM:MSG,MSG]...\n", QUIS
);
144 int main(int argc
, char *argv
[])
154 /* --- Initialize mLib --- */
159 /* --- Parse options --- */
162 static struct option opt
[] = {
163 { "help", 0, 0, 'h' },
164 { "usage", 0, 0, 'u' },
165 { "version", 0, 0, 'v' },
166 { "display", OPTF_ARGREQ
, 0, 'd' },
167 { "atom", OPTF_ARGREQ
, 0, 'a' },
168 { "msg", OPTF_ARGREQ
, 0, 'm' },
169 { "force", 0, 0, 'f' },
173 int i
= mdwopt(argc
, argv
, "huvd:a:m:f", opt
, 0, 0, 0);
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"
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"
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"
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",
214 xa
= addatom(optarg
);
218 die(EXIT_FAILURE
, "no atom currently defined");
231 /* --- Grind through remaining arguments in the new syntax --- */
233 while (optind
< argc
) {
234 char *p
= strtok(argv
[optind
++], ":");
238 while ((p
= strtok(0, ",")) != 0)
242 /* --- If there's nothing set, put in some defaults --- */
245 xa
= addatom(XWAIT_DIE
);
246 addmsg(xa
, XWAIT_DIE_MSG
);
249 /* --- Attach the atoms to the screens --- */
253 Atom ready
= XInternAtom(dpy
, "XWAIT_READY", False
);
254 int nsc
= ScreenCount(dpy
);
256 /* --- First pass: make sure there's not a process already here --- */
258 if ((f
& f_force
) == 0) {
259 for (i
= 0; i
< nsc
; i
++) {
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'");
267 /* --- Second pass: set up listening to the property --- */
269 for (i
= 0; i
< nsc
; i
++) {
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
);
276 /* --- Set up a handler when children die --- *
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.
286 sa
.sa_handler
= sigchld
;
287 sigemptyset(&sa
.sa_mask
);
288 sigaddset(&sa
.sa_mask
, SIGCHLD
);
289 sa
.sa_flags
= SA_NOCLDSTOP
;
291 sa
.sa_flags
|= SA_RESTART
;
293 sigaction(SIGCHLD
, &sa
, 0);
296 /* --- Now reap any which have been waiting around so far --- */
302 sigaddset(&ss
, SIGCHLD
);
303 sigprocmask(SIG_BLOCK
, &ss
, &oss
);
305 sigprocmask(SIG_SETMASK
, &oss
, 0);
308 signal(SIGINT
, tidy
);
309 signal(SIGTERM
, tidy
);
311 /* --- Now wait for an event --- */
314 XNextEvent(dpy
, &ev
);
317 for (xa
= atoms
; xa
; xa
= xa
->next
) {
318 if (ev
.xproperty
.atom
!= xa
->a
)
320 a
= xatom_get(dpy
, ev
.xproperty
.window
, xa
->a
);
325 for (xm
= xa
->m
; xm
; xm
= xm
->next
) {
334 /* --- Finished: report the result if necessary --- */
338 fputs(XGetAtomName(dpy
, xa
->a
), stdout
);
339 if (!xa
->m
|| xa
->m
->next
)
340 printf(": %s\n", XGetAtomName(dpy
, a
));
343 } else if (!xa
->m
|| xa
->m
->next
)
344 printf("%s\n", XGetAtomName(dpy
, a
));
346 /* --- Go away --- */
352 /*----- That's all, folks -------------------------------------------------*/