Commit | Line | Data |
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afb4ecad JD |
1 | /* Session management module for systems which understand the X Session |
2 | management protocol. | |
49f70d46 | 3 | Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 |
8cabe764 | 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> |
d7306fe6 | 35 | #include <setjmp.h> |
afb4ecad | 36 | |
fa8459a3 | 37 | #include "lisp.h" |
afb4ecad JD |
38 | #include "systime.h" |
39 | #include "sysselect.h" | |
428a555e | 40 | #include "frame.h" |
afb4ecad | 41 | #include "termhooks.h" |
656132eb | 42 | #include "termopts.h" |
231d6cfb | 43 | #include "xterm.h" |
afb4ecad | 44 | |
afb4ecad JD |
45 | /* The user login name. */ |
46 | ||
47 | extern Lisp_Object Vuser_login_name; | |
48 | ||
3b8f9651 | 49 | /* This is the event used when SAVE_SESSION_EVENT occurs. */ |
afb4ecad JD |
50 | |
51 | static struct input_event emacs_event; | |
52 | ||
3b8f9651 | 53 | /* The descriptor that we use to check for data from the session manager. */ |
afb4ecad | 54 | |
182659ae | 55 | static int ice_fd; |
afb4ecad | 56 | |
3b8f9651 | 57 | /* A flag that says if we are in shutdown interactions or not. */ |
afb4ecad | 58 | |
182659ae | 59 | static int doing_interact; |
afb4ecad | 60 | |
4f2f546e | 61 | /* The session manager object for the session manager connection. */ |
afb4ecad JD |
62 | |
63 | static SmcConn smc_conn; | |
64 | ||
4f2f546e JD |
65 | /* The client session id for this session. */ |
66 | ||
afb4ecad JD |
67 | static char *client_id; |
68 | ||
4f2f546e JD |
69 | /* The full path name to the Emacs program. */ |
70 | ||
afb4ecad JD |
71 | static char *emacs_program; |
72 | ||
4f2f546e | 73 | /* The client session id for this session as a lisp object. */ |
afb4ecad JD |
74 | |
75 | Lisp_Object Vx_session_id; | |
76 | ||
77 | /* The id we had the previous session. This is only available if we | |
4f2f546e | 78 | have been started by the session manager with SMID_OPT. */ |
afb4ecad JD |
79 | |
80 | Lisp_Object Vx_session_previous_id; | |
81 | ||
82 | /* The option we tell the session manager to start Emacs with when | |
4f2f546e | 83 | restarting Emacs. The client_id is appended. */ |
afb4ecad JD |
84 | |
85 | #define SMID_OPT "--smid=" | |
86 | ||
87 | ||
ca2417b9 | 88 | /* The option to start Emacs without the splash screen when |
4f2f546e | 89 | restarting Emacs. */ |
ca2417b9 JD |
90 | |
91 | #define NOSPLASH_OPT "--no-splash" | |
92 | ||
182659ae JD |
93 | static void |
94 | ice_connection_closed () | |
95 | { | |
96 | if (ice_fd >= 0) | |
97 | delete_keyboard_wait_descriptor (ice_fd); | |
98 | ice_fd = -1; | |
99 | } | |
100 | ||
ca2417b9 | 101 | |
afb4ecad JD |
102 | /* Handle any messages from the session manager. If no connection is |
103 | open to a session manager, just return 0. | |
a6950dfa | 104 | Otherwise returns 1 if SAVE_SESSION_EVENT is stored in buffer BUFP. */ |
4f2f546e | 105 | |
afb4ecad | 106 | int |
a6950dfa | 107 | x_session_check_input (bufp) |
afb4ecad | 108 | struct input_event *bufp; |
afb4ecad JD |
109 | { |
110 | SELECT_TYPE read_fds; | |
111 | EMACS_TIME tmout; | |
182659ae | 112 | int ret; |
7d0393cf | 113 | |
afb4ecad | 114 | if (ice_fd == -1) return 0; |
afb4ecad JD |
115 | FD_ZERO (&read_fds); |
116 | FD_SET (ice_fd, &read_fds); | |
7d0393cf | 117 | |
afb4ecad JD |
118 | tmout.tv_sec = 0; |
119 | tmout.tv_usec = 0; | |
7d0393cf | 120 | |
afb4ecad JD |
121 | /* Reset this so wo can check kind after callbacks have been called by |
122 | IceProcessMessages. The smc_interact_CB sets the kind to | |
3b8f9651 | 123 | SAVE_SESSION_EVENT, but we don't know beforehand if that callback |
4f2f546e | 124 | will be called. */ |
3b8f9651 | 125 | emacs_event.kind = NO_EVENT; |
afb4ecad | 126 | |
182659ae JD |
127 | ret = select (ice_fd+1, &read_fds, |
128 | (SELECT_TYPE *)0, (SELECT_TYPE *)0, &tmout); | |
129 | ||
130 | if (ret < 0) | |
afb4ecad | 131 | { |
182659ae JD |
132 | ice_connection_closed (); |
133 | } | |
134 | else if (ret > 0 && FD_ISSET (ice_fd, &read_fds)) | |
135 | { | |
136 | ret = IceProcessMessages (SmcGetIceConnection (smc_conn), | |
137 | (IceReplyWaitInfo *)0, (Bool *)0); | |
138 | if (ret != IceProcessMessagesSuccess) | |
139 | { | |
140 | /* Either IO error or Connection closed. */ | |
141 | if (ret == IceProcessMessagesIOError) | |
142 | IceCloseConnection (SmcGetIceConnection (smc_conn)); | |
143 | ||
144 | ice_connection_closed (); | |
145 | } | |
afb4ecad | 146 | } |
7d0393cf | 147 | |
afb4ecad | 148 | /* Check if smc_interact_CB was called and we shall generate a |
4f2f546e | 149 | SAVE_SESSION_EVENT. */ |
182659ae JD |
150 | if (emacs_event.kind != NO_EVENT) |
151 | bcopy (&emacs_event, bufp, sizeof (struct input_event)); | |
afb4ecad | 152 | |
182659ae | 153 | return emacs_event.kind != NO_EVENT ? 1 : 0; |
afb4ecad JD |
154 | } |
155 | ||
4f2f546e JD |
156 | /* Return non-zero if we have a connection to a session manager. */ |
157 | ||
afb4ecad JD |
158 | int |
159 | x_session_have_connection () | |
160 | { | |
161 | return ice_fd != -1; | |
162 | } | |
163 | ||
164 | /* This is called when the session manager says it is OK to interact with the | |
3b8f9651 | 165 | user. Here we set the kind to SAVE_SESSION_EVENT so an event is generated. |
4f2f546e JD |
166 | Then lisp code can interact with the user. */ |
167 | ||
afb4ecad JD |
168 | static void |
169 | smc_interact_CB (smcConn, clientData) | |
170 | SmcConn smcConn; | |
171 | SmPointer clientData; | |
172 | { | |
173 | doing_interact = True; | |
3b8f9651 | 174 | emacs_event.kind = SAVE_SESSION_EVENT; |
0b9fc69a | 175 | emacs_event.arg = Qnil; |
afb4ecad JD |
176 | } |
177 | ||
f25dcaa0 | 178 | /* This is called when the session manager tells us to save ourselves. |
afb4ecad JD |
179 | We set the required properties so the session manager can restart us, |
180 | plus the current working directory property (not mandatory) so we | |
181 | are started in the correct directory. | |
182 | ||
183 | If this is a shutdown and we can request to interact with the user, | |
4f2f546e JD |
184 | we do so, because we don't know what the lisp code might do. */ |
185 | ||
afb4ecad JD |
186 | static void |
187 | smc_save_yourself_CB (smcConn, | |
188 | clientData, | |
189 | saveType, | |
190 | shutdown, | |
191 | interactStyle, | |
192 | fast) | |
193 | SmcConn smcConn; | |
194 | SmPointer clientData; | |
195 | int saveType; | |
196 | Bool shutdown; | |
197 | int interactStyle; | |
198 | Bool fast; | |
199 | { | |
200 | #define NR_PROPS 5 | |
7d0393cf | 201 | |
afb4ecad JD |
202 | SmProp *props[NR_PROPS]; |
203 | SmProp prop_ptr[NR_PROPS]; | |
7d0393cf | 204 | |
afb4ecad JD |
205 | SmPropValue values[20]; |
206 | int val_idx = 0; | |
207 | int props_idx = 0; | |
7d0393cf | 208 | |
c187839d | 209 | char *cwd = NULL; |
afb4ecad JD |
210 | char *smid_opt; |
211 | ||
4f2f546e | 212 | /* How to start a new instance of Emacs. */ |
afb4ecad JD |
213 | props[props_idx] = &prop_ptr[props_idx]; |
214 | props[props_idx]->name = SmCloneCommand; | |
215 | props[props_idx]->type = SmLISTofARRAY8; | |
216 | props[props_idx]->num_vals = 1; | |
217 | props[props_idx]->vals = &values[val_idx++]; | |
218 | props[props_idx]->vals[0].length = strlen (emacs_program); | |
219 | props[props_idx]->vals[0].value = emacs_program; | |
220 | ++props_idx; | |
221 | ||
4f2f546e | 222 | /* The name of the program. */ |
afb4ecad JD |
223 | props[props_idx] = &prop_ptr[props_idx]; |
224 | props[props_idx]->name = SmProgram; | |
225 | props[props_idx]->type = SmARRAY8; | |
226 | props[props_idx]->num_vals = 1; | |
227 | props[props_idx]->vals = &values[val_idx++]; | |
d5db4077 KR |
228 | props[props_idx]->vals[0].length = strlen (SDATA (Vinvocation_name)); |
229 | props[props_idx]->vals[0].value = SDATA (Vinvocation_name); | |
afb4ecad | 230 | ++props_idx; |
7d0393cf | 231 | |
4f2f546e | 232 | /* How to restart Emacs (i.e.: /path/to/emacs --smid=xxxx --no-splash). */ |
afb4ecad JD |
233 | props[props_idx] = &prop_ptr[props_idx]; |
234 | props[props_idx]->name = SmRestartCommand; | |
235 | props[props_idx]->type = SmLISTofARRAY8; | |
4f2f546e | 236 | props[props_idx]->num_vals = 3; /* /path/to/emacs, --smid=xxx --no-splash */ |
afb4ecad JD |
237 | props[props_idx]->vals = &values[val_idx]; |
238 | props[props_idx]->vals[0].length = strlen (emacs_program); | |
239 | props[props_idx]->vals[0].value = emacs_program; | |
240 | ||
241 | smid_opt = xmalloc (strlen (SMID_OPT) + strlen (client_id) + 1); | |
242 | strcpy (smid_opt, SMID_OPT); | |
243 | strcat (smid_opt, client_id); | |
7d0393cf | 244 | |
afb4ecad JD |
245 | props[props_idx]->vals[1].length = strlen (smid_opt); |
246 | props[props_idx]->vals[1].value = smid_opt; | |
ca2417b9 JD |
247 | |
248 | props[props_idx]->vals[2].length = strlen (NOSPLASH_OPT); | |
249 | props[props_idx]->vals[2].value = NOSPLASH_OPT; | |
250 | val_idx += 3; | |
afb4ecad JD |
251 | ++props_idx; |
252 | ||
4f2f546e | 253 | /* User id. */ |
afb4ecad JD |
254 | props[props_idx] = &prop_ptr[props_idx]; |
255 | props[props_idx]->name = SmUserID; | |
256 | props[props_idx]->type = SmARRAY8; | |
257 | props[props_idx]->num_vals = 1; | |
258 | props[props_idx]->vals = &values[val_idx++]; | |
d5db4077 KR |
259 | props[props_idx]->vals[0].length = strlen (SDATA (Vuser_login_name)); |
260 | props[props_idx]->vals[0].value = SDATA (Vuser_login_name); | |
afb4ecad JD |
261 | ++props_idx; |
262 | ||
c187839d EZ |
263 | cwd = get_current_dir_name (); |
264 | ||
265 | if (cwd) | |
afb4ecad JD |
266 | { |
267 | props[props_idx] = &prop_ptr[props_idx]; | |
268 | props[props_idx]->name = SmCurrentDirectory; | |
269 | props[props_idx]->type = SmARRAY8; | |
270 | props[props_idx]->num_vals = 1; | |
271 | props[props_idx]->vals = &values[val_idx++]; | |
272 | props[props_idx]->vals[0].length = strlen (cwd); | |
273 | props[props_idx]->vals[0].value = cwd; | |
274 | ++props_idx; | |
275 | } | |
7d0393cf JB |
276 | |
277 | ||
afb4ecad JD |
278 | SmcSetProperties (smcConn, props_idx, props); |
279 | ||
280 | xfree (smid_opt); | |
281 | ||
c2cd06e6 | 282 | free (cwd); |
c187839d | 283 | |
4f2f546e | 284 | /* See if we maybe shall interact with the user. */ |
afb4ecad JD |
285 | if (interactStyle != SmInteractStyleAny |
286 | || ! shutdown | |
287 | || saveType == SmSaveLocal | |
288 | || ! SmcInteractRequest (smcConn, SmDialogNormal, smc_interact_CB, 0)) | |
289 | { | |
4f2f546e | 290 | /* No interaction, we are done saving ourself. */ |
afb4ecad JD |
291 | SmcSaveYourselfDone (smcConn, True); |
292 | } | |
293 | } | |
294 | ||
4f2f546e JD |
295 | /* According to the SM specification, this shall close the connection. */ |
296 | ||
afb4ecad JD |
297 | static void |
298 | smc_die_CB (smcConn, clientData) | |
299 | SmcConn smcConn; | |
300 | SmPointer clientData; | |
301 | { | |
0b9fc69a JD |
302 | emacs_event.kind = SAVE_SESSION_EVENT; |
303 | emacs_event.arg = Qt; | |
afb4ecad JD |
304 | } |
305 | ||
306 | /* We don't use the next two but they are mandatory, leave them empty. | |
307 | According to the SM specification, we should not interact with the | |
308 | user between smc_save_yourself_CB is called and until smc_save_complete_CB | |
309 | is called. It seems like a lot of job to implement this and it doesn't | |
4f2f546e JD |
310 | even seem necessary. */ |
311 | ||
afb4ecad JD |
312 | static void |
313 | smc_save_complete_CB (smcConn, clientData) | |
314 | SmcConn smcConn; | |
315 | SmPointer clientData; | |
316 | { | |
317 | /* Empty */ | |
318 | } | |
319 | ||
320 | static void | |
321 | smc_shutdown_cancelled_CB (smcConn, clientData) | |
322 | SmcConn smcConn; | |
323 | SmPointer clientData; | |
324 | { | |
325 | /* Empty */ | |
326 | } | |
327 | ||
f25dcaa0 | 328 | /* Error handlers for SM and ICE. We don't want to exit Emacs just |
4f2f546e JD |
329 | because there is some error in the session management. */ |
330 | ||
afb4ecad JD |
331 | static void |
332 | smc_error_handler (smcConn, | |
333 | swap, | |
334 | offendingMinorOpcode, | |
335 | offendingSequence, | |
336 | errorClass, | |
337 | severity, | |
338 | values) | |
339 | SmcConn smcConn; | |
340 | Bool swap; | |
341 | int offendingMinorOpcode; | |
342 | unsigned long offendingSequence; | |
343 | int errorClass; | |
344 | int severity; | |
345 | SmPointer values; | |
346 | { | |
4f2f546e | 347 | /* Empty */ |
afb4ecad JD |
348 | } |
349 | ||
350 | static void | |
351 | ice_error_handler (iceConn, | |
352 | swap, | |
353 | offendingMinorOpcode, | |
354 | offendingSequence, | |
355 | errorClass, | |
356 | severity, | |
357 | values) | |
358 | IceConn iceConn; | |
359 | Bool swap; | |
360 | int offendingMinorOpcode; | |
361 | unsigned long offendingSequence; | |
362 | int errorClass; | |
363 | int severity; | |
364 | IcePointer values; | |
365 | { | |
4f2f546e | 366 | /* Empty */ |
afb4ecad JD |
367 | } |
368 | ||
369 | ||
370 | static void | |
371 | ice_io_error_handler (iceConn) | |
372 | IceConn iceConn; | |
373 | { | |
4f2f546e | 374 | /* Connection probably gone. */ |
182659ae | 375 | ice_connection_closed (); |
afb4ecad JD |
376 | } |
377 | ||
378 | /* This is called when the ICE connection is created or closed. The SM library | |
4f2f546e JD |
379 | uses ICE as it transport protocol. */ |
380 | ||
afb4ecad JD |
381 | static void |
382 | ice_conn_watch_CB (iceConn, clientData, opening, watchData) | |
383 | IceConn iceConn; | |
384 | IcePointer clientData; | |
385 | Bool opening; | |
386 | IcePointer *watchData; | |
387 | { | |
388 | if (! opening) | |
389 | { | |
182659ae | 390 | ice_connection_closed (); |
afb4ecad JD |
391 | return; |
392 | } | |
7d0393cf | 393 | |
afb4ecad | 394 | ice_fd = IceConnectionNumber (iceConn); |
afb4ecad | 395 | #ifdef F_SETOWN |
afb4ecad | 396 | fcntl (ice_fd, F_SETOWN, getpid ()); |
afb4ecad | 397 | #endif /* ! defined (F_SETOWN) */ |
afb4ecad JD |
398 | |
399 | #ifdef SIGIO | |
400 | if (interrupt_input) | |
401 | init_sigio (ice_fd); | |
402 | #endif /* ! defined (SIGIO) */ | |
182659ae JD |
403 | |
404 | add_keyboard_wait_descriptor (ice_fd); | |
afb4ecad JD |
405 | } |
406 | ||
231d6cfb | 407 | /* Create the client leader window. */ |
4f2f546e | 408 | |
231d6cfb JD |
409 | static void |
410 | create_client_leader_window (dpyinfo, client_id) | |
411 | struct x_display_info *dpyinfo; | |
412 | char *client_id; | |
413 | { | |
414 | Window w; | |
415 | XClassHint class_hints; | |
416 | Atom sm_id; | |
417 | ||
418 | w = XCreateSimpleWindow (dpyinfo->display, | |
419 | dpyinfo->root_window, | |
420 | -1, -1, 1, 1, | |
421 | CopyFromParent, CopyFromParent, CopyFromParent); | |
422 | ||
423 | class_hints.res_name = (char *) SDATA (Vx_resource_name); | |
424 | class_hints.res_class = (char *) SDATA (Vx_resource_class); | |
425 | XSetClassHint (dpyinfo->display, w, &class_hints); | |
426 | XStoreName (dpyinfo->display, w, class_hints.res_name); | |
427 | ||
428 | sm_id = XInternAtom (dpyinfo->display, "SM_CLIENT_ID", False); | |
429 | XChangeProperty (dpyinfo->display, w, sm_id, XA_STRING, 8, PropModeReplace, | |
430 | client_id, strlen (client_id)); | |
431 | ||
432 | dpyinfo->client_leader_window = w; | |
433 | } | |
434 | ||
4f2f546e JD |
435 | /* Try to open a connection to the session manager. */ |
436 | ||
afb4ecad | 437 | void |
231d6cfb JD |
438 | x_session_initialize (dpyinfo) |
439 | struct x_display_info *dpyinfo; | |
afb4ecad JD |
440 | { |
441 | #define SM_ERRORSTRING_LEN 512 | |
442 | char errorstring[SM_ERRORSTRING_LEN]; | |
443 | char* previous_id = NULL; | |
444 | SmcCallbacks callbacks; | |
445 | int name_len = 0; | |
7d0393cf | 446 | |
182659ae JD |
447 | ice_fd = -1; |
448 | doing_interact = False; | |
449 | ||
afb4ecad | 450 | /* Check if we where started by the session manager. If so, we will |
4f2f546e | 451 | have a previous id. */ |
afb4ecad | 452 | if (! EQ (Vx_session_previous_id, Qnil) && STRINGP (Vx_session_previous_id)) |
d5db4077 | 453 | previous_id = SDATA (Vx_session_previous_id); |
afb4ecad | 454 | |
4f2f546e | 455 | /* Construct the path to the Emacs program. */ |
afb4ecad | 456 | if (! EQ (Vinvocation_directory, Qnil)) |
d5db4077 KR |
457 | name_len += strlen (SDATA (Vinvocation_directory)); |
458 | name_len += strlen (SDATA (Vinvocation_name)); | |
afb4ecad JD |
459 | |
460 | /* This malloc will not be freed, but it is only done once, and hopefully | |
4f2f546e | 461 | not very large */ |
afb4ecad JD |
462 | emacs_program = xmalloc (name_len + 1); |
463 | emacs_program[0] = '\0'; | |
464 | ||
465 | if (! EQ (Vinvocation_directory, Qnil)) | |
d5db4077 KR |
466 | strcpy (emacs_program, SDATA (Vinvocation_directory)); |
467 | strcat (emacs_program, SDATA (Vinvocation_name)); | |
7d0393cf | 468 | |
afb4ecad | 469 | /* The SM protocol says all callbacks are mandatory, so set up all |
4f2f546e | 470 | here and in the mask passed to SmcOpenConnection. */ |
afb4ecad JD |
471 | callbacks.save_yourself.callback = smc_save_yourself_CB; |
472 | callbacks.save_yourself.client_data = 0; | |
473 | callbacks.die.callback = smc_die_CB; | |
474 | callbacks.die.client_data = 0; | |
475 | callbacks.save_complete.callback = smc_save_complete_CB; | |
476 | callbacks.save_complete.client_data = 0; | |
477 | callbacks.shutdown_cancelled.callback = smc_shutdown_cancelled_CB; | |
478 | callbacks.shutdown_cancelled.client_data = 0; | |
479 | ||
4f2f546e | 480 | /* Set error handlers. */ |
afb4ecad JD |
481 | SmcSetErrorHandler (smc_error_handler); |
482 | IceSetErrorHandler (ice_error_handler); | |
483 | IceSetIOErrorHandler (ice_io_error_handler); | |
484 | ||
4f2f546e | 485 | /* Install callback for when connection status changes. */ |
afb4ecad JD |
486 | IceAddConnectionWatch (ice_conn_watch_CB, 0); |
487 | ||
488 | /* Open the connection to the session manager. A failure is not | |
f25dcaa0 | 489 | critical, it usually means that no session manager is running. |
4f2f546e | 490 | The errorstring is here for debugging. */ |
afb4ecad JD |
491 | smc_conn = SmcOpenConnection (NULL, NULL, 1, 0, |
492 | (SmcSaveYourselfProcMask| | |
493 | SmcDieProcMask| | |
494 | SmcSaveCompleteProcMask| | |
495 | SmcShutdownCancelledProcMask), | |
496 | &callbacks, | |
497 | previous_id, | |
498 | &client_id, | |
499 | SM_ERRORSTRING_LEN, | |
500 | errorstring); | |
501 | ||
502 | if (smc_conn != 0) | |
231d6cfb JD |
503 | { |
504 | Vx_session_id = make_string (client_id, strlen (client_id)); | |
505 | ||
506 | #ifdef USE_GTK | |
507 | /* GTK creats a leader window by itself, but we need to tell | |
508 | it about our client_id. */ | |
509 | gdk_set_sm_client_id (client_id); | |
510 | #else | |
511 | create_client_leader_window (dpyinfo, client_id); | |
512 | #endif | |
513 | } | |
afb4ecad JD |
514 | } |
515 | ||
d51abf22 KL |
516 | /* Ensure that the session manager is not contacted again. */ |
517 | ||
518 | void | |
519 | x_session_close () | |
520 | { | |
182659ae | 521 | ice_connection_closed (); |
d51abf22 KL |
522 | } |
523 | ||
afb4ecad JD |
524 | |
525 | DEFUN ("handle-save-session", Fhandle_save_session, | |
526 | Shandle_save_session, 1, 1, "e", | |
527 | doc: /* Handle the save_yourself event from a session manager. | |
7d0393cf | 528 | A session manager can tell Emacs that the window system is shutting down |
afb4ecad JD |
529 | by sending Emacs a save_yourself message. Emacs executes this function when |
530 | such an event occurs. This function then executes `emacs-session-save'. | |
531 | After that, this function informs the session manager that it can continue | |
532 | or abort shutting down the window system depending on the return value | |
533 | from `emacs-session-save' If the return value is non-nil the session manager | |
534 | is told to abort the window system shutdown. | |
535 | ||
536 | Do not call this function yourself. */) | |
537 | (event) | |
538 | Lisp_Object event; | |
539 | { | |
0b9fc69a JD |
540 | int kill_emacs = CONSP (event) && CONSP (XCDR (event)) |
541 | && EQ (Qt, XCAR (XCDR (event))); | |
542 | ||
afb4ecad JD |
543 | /* Check doing_interact so that we don't do anything if someone called |
544 | this at the wrong time. */ | |
0b9fc69a | 545 | if (doing_interact && ! kill_emacs) |
afb4ecad JD |
546 | { |
547 | Bool cancel_shutdown = False; | |
548 | ||
549 | cancel_shutdown = ! EQ (call0 (intern ("emacs-session-save")), Qnil); | |
550 | ||
551 | SmcInteractDone (smc_conn, cancel_shutdown); | |
552 | SmcSaveYourselfDone (smc_conn, True); | |
553 | ||
554 | doing_interact = False; | |
555 | } | |
0b9fc69a JD |
556 | else if (kill_emacs) |
557 | { | |
558 | /* We should not do user interaction here, but it is not easy to | |
559 | prevent. Fix this in next version. */ | |
560 | Fkill_emacs (Qnil); | |
ad4ace7a | 561 | |
0b9fc69a JD |
562 | /* This will not be reached, but we want kill-emacs-hook to be run. */ |
563 | SmcCloseConnection (smc_conn, 0, 0); | |
564 | ice_connection_closed (); | |
565 | } | |
566 | ||
ad4ace7a | 567 | return Qnil; |
afb4ecad | 568 | } |
0b9fc69a | 569 | |
afb4ecad JD |
570 | |
571 | \f | |
572 | /*********************************************************************** | |
573 | Initialization | |
574 | ***********************************************************************/ | |
575 | void | |
576 | syms_of_xsmfns () | |
577 | { | |
578 | DEFVAR_LISP ("x-session-id", &Vx_session_id, | |
579 | doc: /* The session id Emacs got from the session manager for this session. | |
580 | Changing the value does not change the session id used by Emacs. | |
581 | The value is nil if no session manager is running. | |
582 | See also `x-session-previous-id', `emacs-save-session-functions', | |
583 | `emacs-session-save' and `emacs-session-restore'." */); | |
584 | Vx_session_id = Qnil; | |
585 | ||
586 | DEFVAR_LISP ("x-session-previous-id", &Vx_session_previous_id, | |
587 | doc: /* The previous session id Emacs got from session manager. | |
7d0393cf | 588 | If Emacs is running on a window system that has a session manager, the |
fbcdaefb | 589 | session manager gives Emacs a session id. It is feasible for Emacs Lisp |
7d0393cf JB |
590 | code to use the session id to save configuration in, for example, a file |
591 | with a file name based on the session id. If Emacs is running when the | |
592 | window system is shut down, the session manager remembers that Emacs was | |
afb4ecad JD |
593 | running and saves the session id Emacs had. |
594 | ||
7d0393cf JB |
595 | When the window system is started again, the session manager restarts |
596 | Emacs and hands Emacs the session id it had the last time it was | |
597 | running. This is now the previous session id and the value of this | |
598 | variable. If configuration was saved in a file as stated above, the | |
afb4ecad JD |
599 | previous session id shall be used to reconstruct the file name. |
600 | ||
7d0393cf | 601 | The session id Emacs has while it is running is in the variable |
afb4ecad JD |
602 | `x-session-id'. The value of this variable and `x-session-id' may be the |
603 | same, depending on how the session manager works. | |
604 | ||
605 | See also `emacs-save-session-functions', `emacs-session-save' and | |
606 | `emacs-session-restore'." */); | |
607 | Vx_session_previous_id = Qnil; | |
7d0393cf | 608 | |
afb4ecad JD |
609 | defsubr (&Shandle_save_session); |
610 | } | |
611 | ||
612 | #endif /* HAVE_X_SM */ | |
ab5796a9 MB |
613 | |
614 | /* arch-tag: 56a2c58c-adfa-430a-b772-130abd29fd2e | |
615 | (do not change this comment) */ |