Commit | Line | Data |
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afb4ecad JD |
1 | /* Session management module for systems which understand the X Session |
2 | management protocol. | |
8cabe764 GM |
3 | Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 |
4 | Free Software Foundation, Inc. | |
afb4ecad JD |
5 | |
6 | This file is part of GNU Emacs. | |
7 | ||
9ec0b715 | 8 | GNU Emacs is free software: you can redistribute it and/or modify |
afb4ecad | 9 | it under the terms of the GNU General Public License as published by |
9ec0b715 GM |
10 | the Free Software Foundation, either version 3 of the License, or |
11 | (at your option) any later version. | |
afb4ecad JD |
12 | |
13 | GNU Emacs is distributed in the hope that it will be useful, | |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | GNU General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
9ec0b715 | 19 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
afb4ecad JD |
20 | |
21 | #include <config.h> | |
22 | ||
23 | #ifdef HAVE_X_SM | |
24 | ||
25 | #include <X11/SM/SMlib.h> | |
231d6cfb JD |
26 | #include <X11/Xlib.h> |
27 | #include <X11/Xutil.h> | |
28 | ||
afb4ecad JD |
29 | #ifdef HAVE_UNISTD_H |
30 | #include <unistd.h> | |
31 | #endif | |
afb4ecad JD |
32 | |
33 | #include <sys/param.h> | |
656132eb | 34 | #include <stdio.h> |
afb4ecad | 35 | |
fa8459a3 | 36 | #include "lisp.h" |
afb4ecad JD |
37 | #include "systime.h" |
38 | #include "sysselect.h" | |
428a555e | 39 | #include "frame.h" |
afb4ecad | 40 | #include "termhooks.h" |
656132eb | 41 | #include "termopts.h" |
231d6cfb | 42 | #include "xterm.h" |
afb4ecad | 43 | |
afb4ecad JD |
44 | /* The user login name. */ |
45 | ||
46 | extern Lisp_Object Vuser_login_name; | |
47 | ||
3b8f9651 | 48 | /* This is the event used when SAVE_SESSION_EVENT occurs. */ |
afb4ecad JD |
49 | |
50 | static struct input_event emacs_event; | |
51 | ||
3b8f9651 | 52 | /* The descriptor that we use to check for data from the session manager. */ |
afb4ecad JD |
53 | |
54 | static int ice_fd = -1; | |
55 | ||
3b8f9651 | 56 | /* A flag that says if we are in shutdown interactions or not. */ |
afb4ecad JD |
57 | |
58 | static int doing_interact = False; | |
59 | ||
4f2f546e | 60 | /* The session manager object for the session manager connection. */ |
afb4ecad JD |
61 | |
62 | static SmcConn smc_conn; | |
63 | ||
4f2f546e JD |
64 | /* The client session id for this session. */ |
65 | ||
afb4ecad JD |
66 | static char *client_id; |
67 | ||
4f2f546e JD |
68 | /* The full path name to the Emacs program. */ |
69 | ||
afb4ecad JD |
70 | static char *emacs_program; |
71 | ||
4f2f546e | 72 | /* The client session id for this session as a lisp object. */ |
afb4ecad JD |
73 | |
74 | Lisp_Object Vx_session_id; | |
75 | ||
76 | /* The id we had the previous session. This is only available if we | |
4f2f546e | 77 | have been started by the session manager with SMID_OPT. */ |
afb4ecad JD |
78 | |
79 | Lisp_Object Vx_session_previous_id; | |
80 | ||
81 | /* The option we tell the session manager to start Emacs with when | |
4f2f546e | 82 | restarting Emacs. The client_id is appended. */ |
afb4ecad JD |
83 | |
84 | #define SMID_OPT "--smid=" | |
85 | ||
86 | ||
ca2417b9 | 87 | /* The option to start Emacs without the splash screen when |
4f2f546e | 88 | restarting Emacs. */ |
ca2417b9 JD |
89 | |
90 | #define NOSPLASH_OPT "--no-splash" | |
91 | ||
92 | ||
afb4ecad JD |
93 | /* Handle any messages from the session manager. If no connection is |
94 | open to a session manager, just return 0. | |
a6950dfa | 95 | Otherwise returns 1 if SAVE_SESSION_EVENT is stored in buffer BUFP. */ |
4f2f546e | 96 | |
afb4ecad | 97 | int |
a6950dfa | 98 | x_session_check_input (bufp) |
afb4ecad | 99 | struct input_event *bufp; |
afb4ecad JD |
100 | { |
101 | SELECT_TYPE read_fds; | |
102 | EMACS_TIME tmout; | |
7d0393cf | 103 | |
afb4ecad | 104 | if (ice_fd == -1) return 0; |
7d0393cf | 105 | |
afb4ecad JD |
106 | FD_ZERO (&read_fds); |
107 | FD_SET (ice_fd, &read_fds); | |
7d0393cf | 108 | |
afb4ecad JD |
109 | tmout.tv_sec = 0; |
110 | tmout.tv_usec = 0; | |
7d0393cf | 111 | |
afb4ecad JD |
112 | /* Reset this so wo can check kind after callbacks have been called by |
113 | IceProcessMessages. The smc_interact_CB sets the kind to | |
3b8f9651 | 114 | SAVE_SESSION_EVENT, but we don't know beforehand if that callback |
4f2f546e | 115 | will be called. */ |
3b8f9651 | 116 | emacs_event.kind = NO_EVENT; |
afb4ecad JD |
117 | |
118 | if (select (ice_fd+1, &read_fds, | |
119 | (SELECT_TYPE *)0, (SELECT_TYPE *)0, &tmout) < 0) | |
120 | { | |
121 | ice_fd = -1; | |
122 | return 0; | |
123 | } | |
7d0393cf | 124 | |
afb4ecad JD |
125 | |
126 | if (FD_ISSET (ice_fd, &read_fds)) | |
127 | IceProcessMessages (SmcGetIceConnection (smc_conn), | |
128 | (IceReplyWaitInfo *)0, (Bool *)0); | |
129 | ||
7d0393cf | 130 | |
afb4ecad | 131 | /* Check if smc_interact_CB was called and we shall generate a |
4f2f546e | 132 | SAVE_SESSION_EVENT. */ |
a6950dfa KS |
133 | if (emacs_event.kind == NO_EVENT) |
134 | return 0; | |
afb4ecad | 135 | |
a6950dfa KS |
136 | bcopy (&emacs_event, bufp, sizeof (struct input_event)); |
137 | return 1; | |
afb4ecad JD |
138 | } |
139 | ||
4f2f546e JD |
140 | /* Return non-zero if we have a connection to a session manager. */ |
141 | ||
afb4ecad JD |
142 | int |
143 | x_session_have_connection () | |
144 | { | |
145 | return ice_fd != -1; | |
146 | } | |
147 | ||
148 | /* This is called when the session manager says it is OK to interact with the | |
3b8f9651 | 149 | user. Here we set the kind to SAVE_SESSION_EVENT so an event is generated. |
4f2f546e JD |
150 | Then lisp code can interact with the user. */ |
151 | ||
afb4ecad JD |
152 | static void |
153 | smc_interact_CB (smcConn, clientData) | |
154 | SmcConn smcConn; | |
155 | SmPointer clientData; | |
156 | { | |
157 | doing_interact = True; | |
3b8f9651 | 158 | emacs_event.kind = SAVE_SESSION_EVENT; |
afb4ecad JD |
159 | } |
160 | ||
f25dcaa0 | 161 | /* This is called when the session manager tells us to save ourselves. |
afb4ecad JD |
162 | We set the required properties so the session manager can restart us, |
163 | plus the current working directory property (not mandatory) so we | |
164 | are started in the correct directory. | |
165 | ||
166 | If this is a shutdown and we can request to interact with the user, | |
4f2f546e JD |
167 | we do so, because we don't know what the lisp code might do. */ |
168 | ||
afb4ecad JD |
169 | static void |
170 | smc_save_yourself_CB (smcConn, | |
171 | clientData, | |
172 | saveType, | |
173 | shutdown, | |
174 | interactStyle, | |
175 | fast) | |
176 | SmcConn smcConn; | |
177 | SmPointer clientData; | |
178 | int saveType; | |
179 | Bool shutdown; | |
180 | int interactStyle; | |
181 | Bool fast; | |
182 | { | |
183 | #define NR_PROPS 5 | |
7d0393cf | 184 | |
afb4ecad JD |
185 | SmProp *props[NR_PROPS]; |
186 | SmProp prop_ptr[NR_PROPS]; | |
7d0393cf | 187 | |
afb4ecad JD |
188 | SmPropValue values[20]; |
189 | int val_idx = 0; | |
190 | int props_idx = 0; | |
7d0393cf | 191 | |
c187839d | 192 | char *cwd = NULL; |
afb4ecad JD |
193 | char *smid_opt; |
194 | ||
4f2f546e | 195 | /* How to start a new instance of Emacs. */ |
afb4ecad JD |
196 | props[props_idx] = &prop_ptr[props_idx]; |
197 | props[props_idx]->name = SmCloneCommand; | |
198 | props[props_idx]->type = SmLISTofARRAY8; | |
199 | props[props_idx]->num_vals = 1; | |
200 | props[props_idx]->vals = &values[val_idx++]; | |
201 | props[props_idx]->vals[0].length = strlen (emacs_program); | |
202 | props[props_idx]->vals[0].value = emacs_program; | |
203 | ++props_idx; | |
204 | ||
4f2f546e | 205 | /* The name of the program. */ |
afb4ecad JD |
206 | props[props_idx] = &prop_ptr[props_idx]; |
207 | props[props_idx]->name = SmProgram; | |
208 | props[props_idx]->type = SmARRAY8; | |
209 | props[props_idx]->num_vals = 1; | |
210 | props[props_idx]->vals = &values[val_idx++]; | |
d5db4077 KR |
211 | props[props_idx]->vals[0].length = strlen (SDATA (Vinvocation_name)); |
212 | props[props_idx]->vals[0].value = SDATA (Vinvocation_name); | |
afb4ecad | 213 | ++props_idx; |
7d0393cf | 214 | |
4f2f546e | 215 | /* How to restart Emacs (i.e.: /path/to/emacs --smid=xxxx --no-splash). */ |
afb4ecad JD |
216 | props[props_idx] = &prop_ptr[props_idx]; |
217 | props[props_idx]->name = SmRestartCommand; | |
218 | props[props_idx]->type = SmLISTofARRAY8; | |
4f2f546e | 219 | props[props_idx]->num_vals = 3; /* /path/to/emacs, --smid=xxx --no-splash */ |
afb4ecad JD |
220 | props[props_idx]->vals = &values[val_idx]; |
221 | props[props_idx]->vals[0].length = strlen (emacs_program); | |
222 | props[props_idx]->vals[0].value = emacs_program; | |
223 | ||
224 | smid_opt = xmalloc (strlen (SMID_OPT) + strlen (client_id) + 1); | |
225 | strcpy (smid_opt, SMID_OPT); | |
226 | strcat (smid_opt, client_id); | |
7d0393cf | 227 | |
afb4ecad JD |
228 | props[props_idx]->vals[1].length = strlen (smid_opt); |
229 | props[props_idx]->vals[1].value = smid_opt; | |
ca2417b9 JD |
230 | |
231 | props[props_idx]->vals[2].length = strlen (NOSPLASH_OPT); | |
232 | props[props_idx]->vals[2].value = NOSPLASH_OPT; | |
233 | val_idx += 3; | |
afb4ecad JD |
234 | ++props_idx; |
235 | ||
4f2f546e | 236 | /* User id. */ |
afb4ecad JD |
237 | props[props_idx] = &prop_ptr[props_idx]; |
238 | props[props_idx]->name = SmUserID; | |
239 | props[props_idx]->type = SmARRAY8; | |
240 | props[props_idx]->num_vals = 1; | |
241 | props[props_idx]->vals = &values[val_idx++]; | |
d5db4077 KR |
242 | props[props_idx]->vals[0].length = strlen (SDATA (Vuser_login_name)); |
243 | props[props_idx]->vals[0].value = SDATA (Vuser_login_name); | |
afb4ecad JD |
244 | ++props_idx; |
245 | ||
c187839d EZ |
246 | cwd = get_current_dir_name (); |
247 | ||
248 | if (cwd) | |
afb4ecad JD |
249 | { |
250 | props[props_idx] = &prop_ptr[props_idx]; | |
251 | props[props_idx]->name = SmCurrentDirectory; | |
252 | props[props_idx]->type = SmARRAY8; | |
253 | props[props_idx]->num_vals = 1; | |
254 | props[props_idx]->vals = &values[val_idx++]; | |
255 | props[props_idx]->vals[0].length = strlen (cwd); | |
256 | props[props_idx]->vals[0].value = cwd; | |
257 | ++props_idx; | |
258 | } | |
7d0393cf JB |
259 | |
260 | ||
afb4ecad JD |
261 | SmcSetProperties (smcConn, props_idx, props); |
262 | ||
263 | xfree (smid_opt); | |
264 | ||
c2cd06e6 | 265 | free (cwd); |
c187839d | 266 | |
4f2f546e | 267 | /* See if we maybe shall interact with the user. */ |
afb4ecad JD |
268 | if (interactStyle != SmInteractStyleAny |
269 | || ! shutdown | |
270 | || saveType == SmSaveLocal | |
271 | || ! SmcInteractRequest (smcConn, SmDialogNormal, smc_interact_CB, 0)) | |
272 | { | |
4f2f546e | 273 | /* No interaction, we are done saving ourself. */ |
afb4ecad JD |
274 | SmcSaveYourselfDone (smcConn, True); |
275 | } | |
276 | } | |
277 | ||
4f2f546e JD |
278 | /* According to the SM specification, this shall close the connection. */ |
279 | ||
afb4ecad JD |
280 | static void |
281 | smc_die_CB (smcConn, clientData) | |
282 | SmcConn smcConn; | |
283 | SmPointer clientData; | |
284 | { | |
285 | SmcCloseConnection (smcConn, 0, 0); | |
286 | ice_fd = -1; | |
287 | } | |
288 | ||
289 | /* We don't use the next two but they are mandatory, leave them empty. | |
290 | According to the SM specification, we should not interact with the | |
291 | user between smc_save_yourself_CB is called and until smc_save_complete_CB | |
292 | is called. It seems like a lot of job to implement this and it doesn't | |
4f2f546e JD |
293 | even seem necessary. */ |
294 | ||
afb4ecad JD |
295 | static void |
296 | smc_save_complete_CB (smcConn, clientData) | |
297 | SmcConn smcConn; | |
298 | SmPointer clientData; | |
299 | { | |
300 | /* Empty */ | |
301 | } | |
302 | ||
303 | static void | |
304 | smc_shutdown_cancelled_CB (smcConn, clientData) | |
305 | SmcConn smcConn; | |
306 | SmPointer clientData; | |
307 | { | |
308 | /* Empty */ | |
309 | } | |
310 | ||
f25dcaa0 | 311 | /* Error handlers for SM and ICE. We don't want to exit Emacs just |
4f2f546e JD |
312 | because there is some error in the session management. */ |
313 | ||
afb4ecad JD |
314 | static void |
315 | smc_error_handler (smcConn, | |
316 | swap, | |
317 | offendingMinorOpcode, | |
318 | offendingSequence, | |
319 | errorClass, | |
320 | severity, | |
321 | values) | |
322 | SmcConn smcConn; | |
323 | Bool swap; | |
324 | int offendingMinorOpcode; | |
325 | unsigned long offendingSequence; | |
326 | int errorClass; | |
327 | int severity; | |
328 | SmPointer values; | |
329 | { | |
4f2f546e | 330 | /* Empty */ |
afb4ecad JD |
331 | } |
332 | ||
333 | static void | |
334 | ice_error_handler (iceConn, | |
335 | swap, | |
336 | offendingMinorOpcode, | |
337 | offendingSequence, | |
338 | errorClass, | |
339 | severity, | |
340 | values) | |
341 | IceConn iceConn; | |
342 | Bool swap; | |
343 | int offendingMinorOpcode; | |
344 | unsigned long offendingSequence; | |
345 | int errorClass; | |
346 | int severity; | |
347 | IcePointer values; | |
348 | { | |
4f2f546e | 349 | /* Empty */ |
afb4ecad JD |
350 | } |
351 | ||
352 | ||
353 | static void | |
354 | ice_io_error_handler (iceConn) | |
355 | IceConn iceConn; | |
356 | { | |
4f2f546e | 357 | /* Connection probably gone. */ |
afb4ecad JD |
358 | ice_fd = -1; |
359 | } | |
360 | ||
361 | /* This is called when the ICE connection is created or closed. The SM library | |
4f2f546e JD |
362 | uses ICE as it transport protocol. */ |
363 | ||
afb4ecad JD |
364 | static void |
365 | ice_conn_watch_CB (iceConn, clientData, opening, watchData) | |
366 | IceConn iceConn; | |
367 | IcePointer clientData; | |
368 | Bool opening; | |
369 | IcePointer *watchData; | |
370 | { | |
371 | if (! opening) | |
372 | { | |
373 | ice_fd = -1; | |
374 | return; | |
375 | } | |
7d0393cf | 376 | |
afb4ecad | 377 | ice_fd = IceConnectionNumber (iceConn); |
afb4ecad | 378 | #ifdef F_SETOWN |
afb4ecad | 379 | fcntl (ice_fd, F_SETOWN, getpid ()); |
afb4ecad | 380 | #endif /* ! defined (F_SETOWN) */ |
afb4ecad JD |
381 | |
382 | #ifdef SIGIO | |
383 | if (interrupt_input) | |
384 | init_sigio (ice_fd); | |
385 | #endif /* ! defined (SIGIO) */ | |
386 | } | |
387 | ||
231d6cfb | 388 | /* Create the client leader window. */ |
4f2f546e | 389 | |
231d6cfb JD |
390 | static void |
391 | create_client_leader_window (dpyinfo, client_id) | |
392 | struct x_display_info *dpyinfo; | |
393 | char *client_id; | |
394 | { | |
395 | Window w; | |
396 | XClassHint class_hints; | |
397 | Atom sm_id; | |
398 | ||
399 | w = XCreateSimpleWindow (dpyinfo->display, | |
400 | dpyinfo->root_window, | |
401 | -1, -1, 1, 1, | |
402 | CopyFromParent, CopyFromParent, CopyFromParent); | |
403 | ||
404 | class_hints.res_name = (char *) SDATA (Vx_resource_name); | |
405 | class_hints.res_class = (char *) SDATA (Vx_resource_class); | |
406 | XSetClassHint (dpyinfo->display, w, &class_hints); | |
407 | XStoreName (dpyinfo->display, w, class_hints.res_name); | |
408 | ||
409 | sm_id = XInternAtom (dpyinfo->display, "SM_CLIENT_ID", False); | |
410 | XChangeProperty (dpyinfo->display, w, sm_id, XA_STRING, 8, PropModeReplace, | |
411 | client_id, strlen (client_id)); | |
412 | ||
413 | dpyinfo->client_leader_window = w; | |
414 | } | |
415 | ||
4f2f546e JD |
416 | /* Try to open a connection to the session manager. */ |
417 | ||
afb4ecad | 418 | void |
231d6cfb JD |
419 | x_session_initialize (dpyinfo) |
420 | struct x_display_info *dpyinfo; | |
afb4ecad JD |
421 | { |
422 | #define SM_ERRORSTRING_LEN 512 | |
423 | char errorstring[SM_ERRORSTRING_LEN]; | |
424 | char* previous_id = NULL; | |
425 | SmcCallbacks callbacks; | |
426 | int name_len = 0; | |
7d0393cf | 427 | |
afb4ecad | 428 | /* Check if we where started by the session manager. If so, we will |
4f2f546e | 429 | have a previous id. */ |
afb4ecad | 430 | if (! EQ (Vx_session_previous_id, Qnil) && STRINGP (Vx_session_previous_id)) |
d5db4077 | 431 | previous_id = SDATA (Vx_session_previous_id); |
afb4ecad | 432 | |
4f2f546e | 433 | /* Construct the path to the Emacs program. */ |
afb4ecad | 434 | if (! EQ (Vinvocation_directory, Qnil)) |
d5db4077 KR |
435 | name_len += strlen (SDATA (Vinvocation_directory)); |
436 | name_len += strlen (SDATA (Vinvocation_name)); | |
afb4ecad JD |
437 | |
438 | /* This malloc will not be freed, but it is only done once, and hopefully | |
4f2f546e | 439 | not very large */ |
afb4ecad JD |
440 | emacs_program = xmalloc (name_len + 1); |
441 | emacs_program[0] = '\0'; | |
442 | ||
443 | if (! EQ (Vinvocation_directory, Qnil)) | |
d5db4077 KR |
444 | strcpy (emacs_program, SDATA (Vinvocation_directory)); |
445 | strcat (emacs_program, SDATA (Vinvocation_name)); | |
7d0393cf | 446 | |
afb4ecad | 447 | /* The SM protocol says all callbacks are mandatory, so set up all |
4f2f546e | 448 | here and in the mask passed to SmcOpenConnection. */ |
afb4ecad JD |
449 | callbacks.save_yourself.callback = smc_save_yourself_CB; |
450 | callbacks.save_yourself.client_data = 0; | |
451 | callbacks.die.callback = smc_die_CB; | |
452 | callbacks.die.client_data = 0; | |
453 | callbacks.save_complete.callback = smc_save_complete_CB; | |
454 | callbacks.save_complete.client_data = 0; | |
455 | callbacks.shutdown_cancelled.callback = smc_shutdown_cancelled_CB; | |
456 | callbacks.shutdown_cancelled.client_data = 0; | |
457 | ||
4f2f546e | 458 | /* Set error handlers. */ |
afb4ecad JD |
459 | SmcSetErrorHandler (smc_error_handler); |
460 | IceSetErrorHandler (ice_error_handler); | |
461 | IceSetIOErrorHandler (ice_io_error_handler); | |
462 | ||
4f2f546e | 463 | /* Install callback for when connection status changes. */ |
afb4ecad JD |
464 | IceAddConnectionWatch (ice_conn_watch_CB, 0); |
465 | ||
466 | /* Open the connection to the session manager. A failure is not | |
f25dcaa0 | 467 | critical, it usually means that no session manager is running. |
4f2f546e | 468 | The errorstring is here for debugging. */ |
afb4ecad JD |
469 | smc_conn = SmcOpenConnection (NULL, NULL, 1, 0, |
470 | (SmcSaveYourselfProcMask| | |
471 | SmcDieProcMask| | |
472 | SmcSaveCompleteProcMask| | |
473 | SmcShutdownCancelledProcMask), | |
474 | &callbacks, | |
475 | previous_id, | |
476 | &client_id, | |
477 | SM_ERRORSTRING_LEN, | |
478 | errorstring); | |
479 | ||
480 | if (smc_conn != 0) | |
231d6cfb JD |
481 | { |
482 | Vx_session_id = make_string (client_id, strlen (client_id)); | |
483 | ||
484 | #ifdef USE_GTK | |
485 | /* GTK creats a leader window by itself, but we need to tell | |
486 | it about our client_id. */ | |
487 | gdk_set_sm_client_id (client_id); | |
488 | #else | |
489 | create_client_leader_window (dpyinfo, client_id); | |
490 | #endif | |
491 | } | |
afb4ecad JD |
492 | } |
493 | ||
d51abf22 KL |
494 | /* Ensure that the session manager is not contacted again. */ |
495 | ||
496 | void | |
497 | x_session_close () | |
498 | { | |
499 | ice_fd = -1; | |
500 | } | |
501 | ||
afb4ecad JD |
502 | |
503 | DEFUN ("handle-save-session", Fhandle_save_session, | |
504 | Shandle_save_session, 1, 1, "e", | |
505 | doc: /* Handle the save_yourself event from a session manager. | |
7d0393cf | 506 | A session manager can tell Emacs that the window system is shutting down |
afb4ecad JD |
507 | by sending Emacs a save_yourself message. Emacs executes this function when |
508 | such an event occurs. This function then executes `emacs-session-save'. | |
509 | After that, this function informs the session manager that it can continue | |
510 | or abort shutting down the window system depending on the return value | |
511 | from `emacs-session-save' If the return value is non-nil the session manager | |
512 | is told to abort the window system shutdown. | |
513 | ||
514 | Do not call this function yourself. */) | |
515 | (event) | |
516 | Lisp_Object event; | |
517 | { | |
518 | /* Check doing_interact so that we don't do anything if someone called | |
519 | this at the wrong time. */ | |
520 | if (doing_interact) | |
521 | { | |
522 | Bool cancel_shutdown = False; | |
523 | ||
524 | cancel_shutdown = ! EQ (call0 (intern ("emacs-session-save")), Qnil); | |
525 | ||
526 | SmcInteractDone (smc_conn, cancel_shutdown); | |
527 | SmcSaveYourselfDone (smc_conn, True); | |
528 | ||
529 | doing_interact = False; | |
530 | } | |
ad4ace7a JD |
531 | |
532 | return Qnil; | |
afb4ecad JD |
533 | } |
534 | ||
535 | \f | |
536 | /*********************************************************************** | |
537 | Initialization | |
538 | ***********************************************************************/ | |
539 | void | |
540 | syms_of_xsmfns () | |
541 | { | |
542 | DEFVAR_LISP ("x-session-id", &Vx_session_id, | |
543 | doc: /* The session id Emacs got from the session manager for this session. | |
544 | Changing the value does not change the session id used by Emacs. | |
545 | The value is nil if no session manager is running. | |
546 | See also `x-session-previous-id', `emacs-save-session-functions', | |
547 | `emacs-session-save' and `emacs-session-restore'." */); | |
548 | Vx_session_id = Qnil; | |
549 | ||
550 | DEFVAR_LISP ("x-session-previous-id", &Vx_session_previous_id, | |
551 | doc: /* The previous session id Emacs got from session manager. | |
7d0393cf | 552 | If Emacs is running on a window system that has a session manager, the |
fbcdaefb | 553 | session manager gives Emacs a session id. It is feasible for Emacs Lisp |
7d0393cf JB |
554 | code to use the session id to save configuration in, for example, a file |
555 | with a file name based on the session id. If Emacs is running when the | |
556 | window system is shut down, the session manager remembers that Emacs was | |
afb4ecad JD |
557 | running and saves the session id Emacs had. |
558 | ||
7d0393cf JB |
559 | When the window system is started again, the session manager restarts |
560 | Emacs and hands Emacs the session id it had the last time it was | |
561 | running. This is now the previous session id and the value of this | |
562 | variable. If configuration was saved in a file as stated above, the | |
afb4ecad JD |
563 | previous session id shall be used to reconstruct the file name. |
564 | ||
7d0393cf | 565 | The session id Emacs has while it is running is in the variable |
afb4ecad JD |
566 | `x-session-id'. The value of this variable and `x-session-id' may be the |
567 | same, depending on how the session manager works. | |
568 | ||
569 | See also `emacs-save-session-functions', `emacs-session-save' and | |
570 | `emacs-session-restore'." */); | |
571 | Vx_session_previous_id = Qnil; | |
7d0393cf | 572 | |
afb4ecad JD |
573 | defsubr (&Shandle_save_session); |
574 | } | |
575 | ||
576 | #endif /* HAVE_X_SM */ | |
ab5796a9 MB |
577 | |
578 | /* arch-tag: 56a2c58c-adfa-430a-b772-130abd29fd2e | |
579 | (do not change this comment) */ |