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1 ;;; server.el --- Lisp code for GNU Emacs running as server process -*- lexical-binding: t -*-
3 ;; Copyright (C) 1986-1987, 1992, 1994-2012 Free Software Foundation, Inc.
5 ;; Author: William Sommerfeld <wesommer@athena.mit.edu>
6 ;; Maintainer: FSF
7 ;; Keywords: processes
9 ;; Changes by peck@sun.com and by rms.
10 ;; Overhaul by Karoly Lorentey <lorentey@elte.hu> for multi-tty support.
12 ;; This file is part of GNU Emacs.
14 ;; GNU Emacs 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 3 of the License, or
17 ;; (at your option) any later version.
19 ;; GNU Emacs 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 GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
27 ;;; Commentary:
29 ;; This Lisp code is run in Emacs when it is to operate as
30 ;; a server for other processes.
32 ;; Load this library and do M-x server-edit to enable Emacs as a server.
33 ;; Emacs opens up a socket for communication with clients. If there are no
34 ;; client buffers to edit, server-edit acts like (switch-to-buffer
35 ;; (other-buffer))
37 ;; When some other program runs "the editor" to edit a file,
38 ;; "the editor" can be the Emacs client program ../lib-src/emacsclient.
39 ;; This program transmits the file names to Emacs through
40 ;; the server subprocess, and Emacs visits them and lets you edit them.
42 ;; Note that any number of clients may dispatch files to Emacs to be edited.
44 ;; When you finish editing a Server buffer, again call server-edit
45 ;; to mark that buffer as done for the client and switch to the next
46 ;; Server buffer. When all the buffers for a client have been edited
47 ;; and exited with server-edit, the client "editor" will return
48 ;; to the program that invoked it.
50 ;; Your editing commands and Emacs's display output go to and from
51 ;; the terminal in the usual way. Thus, server operation is possible
52 ;; only when Emacs can talk to the terminal at the time you invoke
53 ;; the client. This is possible in four cases:
55 ;; 1. On a window system, where Emacs runs in one window and the
56 ;; program that wants to use "the editor" runs in another.
58 ;; 2. On a multi-terminal system, where Emacs runs on one terminal and the
59 ;; program that wants to use "the editor" runs on another.
61 ;; 3. When the program that wants to use "the editor" is running
62 ;; as a subprocess of Emacs.
64 ;; 4. On a system with job control, when Emacs is suspended, the program
65 ;; that wants to use "the editor" will stop and display
66 ;; "Waiting for Emacs...". It can then be suspended, and Emacs can be
67 ;; brought into the foreground for editing. When done editing, Emacs is
68 ;; suspended again, and the client program is brought into the foreground.
70 ;; The buffer local variable "server-buffer-clients" lists
71 ;; the clients who are waiting for this buffer to be edited.
72 ;; The global variable "server-clients" lists all the waiting clients,
73 ;; and which files are yet to be edited for each.
75 ;; Todo:
77 ;; - handle command-line-args-left.
78 ;; - move most of the args processing and decision making from emacsclient.c
79 ;; to here.
80 ;; - fix up handling of the client's environment (place it in the terminal?).
82 ;;; Code:
87 "Emacs running as a server process."
91 "If non-nil, use TCP sockets instead of local sockets."
104 "The name or IP address to use as host address of the server process.
105 If set, the server accepts remote connections; otherwise it is local."
111 ;;;###autoload
115 "The port number that the server process should listen on.
116 This variable only takes effect when the Emacs server is using
117 TCP instead of local sockets. A nil value means to use a random
118 port number."
124 ;;;###autoload
128 "Directory for server authentication files.
129 We only use this if `server-use-tcp' is non-nil.
130 Otherwise we use `server-socket-dir'.
132 NOTE: On FAT32 filesystems, directories are not secure;
133 files can be read and modified by any user or process.
134 It is strongly suggested to set `server-auth-dir' to a
135 directory residing in a NTFS partition instead."
139 ;;;###autoload
143 "If non-nil, raise frame when switching to a buffer."
149 "Hook run when visiting a file for the Emacs server."
154 "Hook run when switching to a buffer for the Emacs server."
159 "Hook run when done editing a buffer for the Emacs server."
167 "List of current server clients.
173 ;; Changing major modes should not erase this local.
177 "Specification of the window to use for selecting Emacs server buffers.
178 If nil, use the selected window.
179 If it is a function, it should take one argument (a buffer) and
180 display and select it. A common value is `pop-to-buffer'.
181 If it is a window, use that.
182 If it is a frame, use the frame's selected window.
184 It is not meaningful to set this to a specific frame or window with Custom.
185 Only programs can do so."
191 nil)
197 "Regexp matching names of temporary files.
198 These are deleted and reused after each edit by the programs that
199 invoke the Emacs server."
204 "Whether to kill buffers when done with them.
205 If non-nil, kill a buffer unless it already existed before editing
206 it with the Emacs server. If nil, kill only buffers as specified by
207 `server-temp-file-regexp'.
208 Please note that only buffers that still have a client are killed,
210 in this way."
219 "Non-nil means the buffer existed before the server was asked to visit it.
220 This means that the server should not kill the buffer when you say you
225 "The name of the Emacs server, if this Emacs process creates one.
226 The command `server-start' makes use of this. It should not be
227 changed while a server is running."
232 ;; We do not use `temporary-file-directory' here, because emacsclient
233 ;; does not read the init file.
237 "The directory in which to place the server socket.
241 "Return a list of clients with PROPERTY set to VALUE."
246 result))
249 "Create a client for process PROC, if it doesn't already have one.
250 New clients have no properties."
254 "Evaluate BODY with environment variables VARS set to those in ENV.
255 The environment variables are then restored to their previous values.
257 VARS should be a list of strings.
258 ENV should be in the same format as `process-environment'."
268 process-environment)))
272 "Delete PROC, including its buffers, terminals and frames.
273 If NOFRAME is non-nil, let the frames live.
274 Updates `server-clients'."
276 ;; Force a new lookup of client (prevents infinite recursion).
280 ;; Kill the client's buffers.
284 ;; Kill the buffer if necessary.
297 ;; Restore clients if user pressed C-g in `kill-buffer'.
300 ;; Delete the client's frames.
305 ;; Prevent `server-handle-delete-frame' from calling us
306 ;; recursively.
312 ;; Delete the client's tty, except on Windows (both GUI and console),
313 ;; where there's only one terminal and does not make sense to delete it.
316 ;; Only delete the terminal if it is non-nil.
320 ;; Delete the client's process.
330 "Buffer used internally by Emacs's server.
331 One use is to log the I/O for debugging purposes (see `server-log'),
332 the other is to provide a current buffer in which the process filter can
339 "If `server-log' is non-nil, log STRING to `server-buffer'.
340 If CLIENT is non-nil, add a description of it to the logged message."
349 string)
353 "The process sentinel for Emacs server connections."
354 ;; If this is a new client process, set the query-on-exit flag to nil
355 ;; for this process (it isn't inherited from the server process).
359 ;; Delete the associated connection file, if applicable.
360 ;; Although there's no 100% guarantee that the file is owned by the
361 ;; running Emacs instance, server-start uses server-running-p to check
362 ;; for possible servers before doing anything, so it *should* be ours.
371 ;; If the current frame is on `display' we're all set.
372 ;; Similarly if we are unable to open frames on other displays, there's
373 ;; nothing more we can do.
376 ;; Otherwise, look for an existing frame there and select it.
380 ;; If there's no frame on that display yet, create and select one.
384 display
385 ;; Make it display (and remember) some dummy buffer, so
386 ;; we can detect later if the frame is in use or not.
388 ;; This frame may be deleted later (see
389 ;; server-unselect-display) so we want it to be as
390 ;; unobtrusive as possible.
394 frame))))
398 ;; If the temporary frame is in use (displays something real), make it
399 ;; visible. If not (which can happen if the user's customizations call
400 ;; pop-to-buffer etc.), delete it to avoid preserving the connection after
401 ;; the last real frame is deleted.
403 ;; Rewritten to avoid inadvertently killing the current buffer after
404 ;; `delete-frame' removed FRAME (Bug#10729).
408 ;; The temp frame still only shows one buffer, and that is the
409 ;; internal temp buffer.
417 "Delete the client connection when the emacsclient frame is deleted.
418 \(To be used from `delete-frame-functions'.)"
421 proc
422 ;; See if this is the last frame for this client.
427 frame-num)))
432 "Notify the client process that its tty device is suspended."
435 proc)
442 "Remove &-quotation from ARG.
443 See `server-quote-arg' and `server-process-filter'."
451 arg t t))
454 "In ARG, insert a & before each &, each space, each newline, and -.
455 Change spaces to underscores, too, so that the return value never
456 contains a space.
458 See `server-unquote-arg' and `server-process-filter'."
466 arg t t))
469 "A wrapper around `process-send-string' for logging."
474 "Make sure DIR is a directory with no race-condition issues.
475 Creates the directory if necessary and makes sure:
476 - there's no symlink involved
477 - it's owned by us
478 - it's not readable/writable by anybody else."
485 ;; Check that it's safe for use.
493 'server
495 Directories on FAT32 filesystems are NOT secure against tampering.
496 See variable `server-auth-dir' for details."
502 ;; Files created on Windows by
503 ;; Administrator (RID=500) have
504 ;; the Administrators (RID=544)
505 ;; group recorded as the owner.
512 t)))
516 ;;;###autoload
518 "Allow this Emacs process to be a server for client processes.
519 This starts a server communications subprocess through which
521 job. To use the server, set up the program `emacsclient' in the
524 Optional argument LEAVE-DEAD (interactively, a prefix arg) means just
525 kill any existing server communications subprocess.
527 If a server is already running, restart it. If clients are
528 running, ask the user for confirmation first, unless optional
529 argument INHIBIT-PROMPT is non-nil.
535 ;; Ask the user before deleting existing clients---except
536 ;; when we can't get user input, which may happen when
537 ;; doing emacsclient --eval "(kill-emacs)" in daemon mode.
542 leave-dead)
549 ;; kill it dead!
551 ;; Delete the socket files made by previous server invocations.
553 ;; Remove any leftover socket or authentication file
559 'server
562 server-name)
563 "To start the server in this Emacs process, stop the existing
567 ;; If this Emacs already had a server, clear out associated status.
570 ;; Now any previous server is properly stopped.
575 ;; Make sure there is a safe directory in which to place the socket.
587 :name server-name
588 :server t
589 :noquery t
592 ;; We must receive file names without being decoded.
593 ;; Those are decoded by server-process-filter according
594 ;; to file-name-coding-system. Also don't get
595 ;; confused by CRs since we don't quote them.
597 ;; The other args depend on the kind of socket used.
604 :service server-file
611 ;; The auth key is a 64-byte string of random chars in the
612 ;; range `!'..`~'.
613 repeat 64
626 "Kill all connections to the current server.
627 This function is meant to be called from `kill-emacs-hook'."
630 ;;;###autoload
632 "Unconditionally delete connection file for server NAME.
633 If server is running, it is first stopped.
634 NAME defaults to `server-name'. With argument, ask for NAME."
641 server-auth-dir
642 server-socket-dir))))
651 "Test whether server NAME is running.
653 Return values:
654 nil the server is definitely not running.
655 t the server seems to be running.
656 something else we cannot determine whether it's running without using
657 commands which may have to wait for a long time."
667 t)
673 t)
676 ;;;###autoload
678 "Toggle Server mode.
679 With a prefix argument ARG, enable Server mode if ARG is
680 positive, and disable it otherwise. If called from Lisp, enable
681 Server mode if ARG is omitted or nil.
683 Server mode runs a process that accepts commands from the
684 `emacsclient' program. See Info node `Emacs server' and
685 `server-start' for details."
686 :global t
689 ;; Fixme: Should this check for an existing server socket and do
690 ;; nothing if there is one (for multiple Emacs sessions)?
692 \f
694 "Eval EXPR and send the result back to client PROC."
695 ;; While we're running asynchronously (from a process filter), it is likely
696 ;; that the emacsclient command was run in response to a user
697 ;; action, so the user probably knows that Emacs is processing this
698 ;; emacsclient request, so if we get a C-g it's likely that the user
699 ;; intended it to interrupt us rather than interrupt whatever Emacs
700 ;; was doing before it started handling the process filter.
701 ;; Hence `with-local-quit' (bug#6585).
715 "Send a `-print QTEXT' command to client PROC.
716 QTEXT must be already quoted.
717 This handles splitting the command if it would be bigger than
718 `server-msg-size'."
720 part)
722 ;; We have to split the string
724 ;; Don't split in the middle of a quote sequence
726 ;; There is an uneven number of & at the end
742 ;; For tgetent(3); list according to ncurses(3).
747 ;; rxvt wants these
752 ;; Ignore nowait here; we always need to
753 ;; clean up opened ttys when the client dies.
755 ;; This is a leftover from an earlier
756 ;; attempt at making it possible for process
757 ;; run in the server process to use the
758 ;; environment of the client process.
759 ;; It has no effect now and to make it work
760 ;; we'd need to decide how to make
761 ;; process-environment interact with client
762 ;; envvars, and then to change the
763 ;; C functions `child_setup' and
764 ;; `getenv_internal' accordingly.
767 ;; ttys don't use the `display' parameter, but callproc.c does to set
768 ;; the DISPLAY environment on subprocesses.
775 ;; Display *scratch* by default.
778 frame))
785 ;; This emacs does not support X.
788 nil)
789 ;; Flag frame as client-created, but use a dummy client.
790 ;; This will prevent the frame from being deleted when
791 ;; emacsclient quits while also preventing
792 ;; `server-save-buffers-kill-terminal' from unexpectedly
793 ;; killing emacs on that frame.
795 ;; This is a leftover, see above.
802 frame)
811 ;; Display *scratch* by default.
813 frame)))
817 ;; If we're running isearch, we must abort it to allow Emacs to
818 ;; display the buffer and switch to it.
823 ;; Signaled by isearch-cancel.
826 ;; We're inside a minibuffer already, so if the emacs-client is trying
827 ;; to open a frame on a new display, we might end up with an unusable
828 ;; frame because input from that display will be blocked (until exiting
829 ;; the minibuffer). Better exit this minibuffer right away.
830 ;; Similarly with recursive-edits such as the splash screen.
834 ;; We use various special properties on process objects:
835 ;; - `env' stores the info about the environment of the emacsclient process.
836 ;; - `continuation' is a no-arg function that we need to execute. It contains
837 ;; commands we wanted to execute in some earlier invocation of the process
838 ;; filter but that we somehow were unable to process at that time
839 ;; (e.g. because we first need to throw to the toplevel).
847 "Process a request from the server to edit some files.
848 PROC is the server process. STRING consists of a sequence of
849 commands prefixed by a dash. Some commands have arguments;
850 these are &-quoted and need to be decoded by `server-unquote-arg'.
851 The filter parses and executes these commands.
853 To illustrate the protocol, here is an example command that
854 emacsclient sends to create a new X frame (note that the whole
855 sequence is sent on a single line):
857 -env HOME=/home/lorentey
858 -env DISPLAY=:0.0
859 ... lots of other -env commands
860 -display :0.0
861 -window-system
863 The following commands are accepted by the server:
865 `-auth AUTH-STRING'
866 Authenticate the client using the secret authentication string
867 AUTH-STRING.
869 `-env NAME=VALUE'
870 An environment variable on the client side.
872 `-dir DIRNAME'
873 The current working directory of the client process.
875 `-current-frame'
876 Forbid the creation of new frames.
878 `-frame-parameters ALIST'
879 Set the parameters of the created frame.
881 `-nowait'
882 Request that the next frame created should not be
883 associated with this client.
885 `-display DISPLAY'
886 Set the display name to open X frames on.
888 `-position LINE[:COLUMN]'
889 Go to the given line and column number
890 in the next file opened.
892 `-file FILENAME'
893 Load the given file in the current frame.
895 `-eval EXPR'
896 Evaluate EXPR as a Lisp expression and return the
897 result in -print commands.
899 `-window-system'
900 Open a new X frame.
902 `-tty DEVICENAME TYPE'
903 Open a new tty frame at the client.
905 `-suspend'
906 Suspend this tty frame. The client sends this string in
907 response to SIGTSTP and SIGTTOU. The server must cease all I/O
908 on this tty until it gets a -resume command.
910 `-resume'
911 Resume this tty frame. The client sends this string when it
912 gets the SIGCONT signal and it is the foreground process on its
913 controlling tty.
915 `-ignore COMMENT'
916 Do nothing, but put the comment in the server log.
917 Useful for debugging.
920 The following commands are accepted by the client:
922 `-emacs-pid PID'
923 Describes the process id of the Emacs process;
924 used to forward window change signals to it.
926 `-window-system-unsupported'
927 Signals that the server does not support creating X frames;
928 the client must try again with a tty frame.
930 `-print STRING'
931 Print STRING on stdout. Used to send values
932 returned by -eval.
934 `-print-nonl STRING'
935 Print STRING on stdout. Used to continue a
936 preceding -print command that would be too big to send
937 in a single message.
939 `-error DESCRIPTION'
940 Signal an error and delete process PROC.
942 `-suspend'
943 Suspend this terminal, i.e., stop the client process.
944 Sent when the user presses C-z."
946 ;; First things first: let's check the authentication
957 ;; Before calling `delete-process', give emacsclient time to
958 ;; receive the error string and shut down on its own.
961 ;; We return immediately
970 ;; Send our pid
974 ;; Save for later any partial line that remains.
978 ;; In earlier versions of server.el (where we used an `emacsserver'
979 ;; process), there could be multiple lines. Nowadays this is not
980 ;; supported any more.
985 default-file-name-coding-system)))
986 nowait ; t if emacsclient does not want to wait for us.
987 frame ; Frame opened for the client (if any).
988 display ; Open frame on this display.
989 parent-id ; Window ID for XEmbed
990 dontkill ; t if client should not be killed.
991 commands
992 dir
993 use-current-frame
994 frame-parameters ;parameters for newly created frame
995 tty-name ; nil, `window-system', or the tty name.
996 tty-type ; string.
997 files
998 filepos
999 args-left)
1000 ;; Remove this line from STRING.
1006 ;; -version CLIENT-VERSION: obsolete at birth.
1009 ;; -nowait: Emacsclient won't wait for a result.
1012 ;; -current-frame: Don't create frames.
1015 ;; -frame-parameters: Set frame parameters
1022 ;; -display DISPLAY:
1023 ;; Open X frames on the given display instead of the default.
1028 ;; -parent-id ID:
1029 ;; Open X frame within window ID, via XEmbed.
1034 ;; -window-system: Open a new X frame.
1039 ;; -resume: Resume a suspended tty frame.
1046 commands)))
1048 ;; -suspend: Suspend the client's frame. (In case we
1049 ;; get out of sync, and a C-z sends a SIGTSTP to
1050 ;; emacsclient.)
1057 commands)))
1059 ;; -ignore COMMENT: Noop; useful for debugging emacsclient.
1060 ;; (The given comment appears in the server log.)
1065 ;; -tty DEVICE-NAME TYPE: Open a new tty frame at the client.
1071 ;; On Windows, emacsclient always asks for a tty frame.
1072 ;; If running a GUI server, force the frame type to GUI.
1076 ;; -position LINE[:COLUMN]: Set point to the given
1077 ;; position in the next file.
1088 ;; -file FILENAME: Load the given file.
1099 ;; -eval EXPR: Evaluate a Lisp expression.
1107 commands)
1110 ;; -env NAME=VALUE: An environment variable.
1113 ;; XXX Variables should be encoded as in getenv/setenv.
1117 ;; -dir DIRNAME: The cwd of the emacsclient process.
1124 ;; Unknown command.
1131 ;; We can't use the Emacs daemon's
1132 ;; terminal frame.
1136 terminal-frame)))))
1141 parent-id
1142 frame-parameters))
1143 ;; When resuming on a tty, tty-name is nil.
1148 proc 'continuation
1151 ;; Use the same cwd as the emacsclient, if possible, so
1152 ;; relative file names work correctly, even in `eval'.
1155 dir default-directory)))
1157 dontkill frame tty-name)))))
1163 ;; condition-case
1167 ;; This is run from timers and process-filters, i.e. "asynchronously".
1168 ;; But w.r.t the user, this is not really asynchronous since the timer
1169 ;; is run after 0s and the process-filter is run in response to the
1170 ;; user running `emacsclient'. So it is OK to override the
1171 ;; inhibit-quit flag, which is good since `commands' (as well as
1172 ;; find-file-noselect via the major-mode) can run arbitrary code,
1173 ;; including code that needs to wait.
1182 ;; Delete the client if necessary.
1185 ;; Client requested nowait; return immediately.
1189 ;; This client is empty; get rid of it immediately.
1194 nil)
1217 ;; Before calling `delete-process', give emacsclient time to
1218 ;; receive the error string and shut down on its own.
1223 "Move point to the position indicated in LINE-COL.
1224 LINE-COL should be a pair (LINE . COL)."
1233 "Find FILES and return a list of buffers created.
1234 FILES is an alist whose elements are (FILENAME . FILEPOS)
1235 where FILEPOS can be nil or a pair (LINENUMBER . COLUMNNUMBER).
1236 PROC is the client that requested this operation.
1237 NOWAIT non-nil means this client is not waiting for the results,
1238 so don't mark these buffers specially, just visit them normally."
1239 ;; Bind last-nonmenu-event to force use of keyboard, not mouse, for queries.
1241 ;; Restore the current buffer afterward, but not using save-excursion,
1242 ;; because we don't want to save point in this buffer
1243 ;; if it happens to be one of those specified by the server.
1246 ;; If there is an existing buffer modified or the file is
1247 ;; modified, revert it. If there is an existing buffer with
1248 ;; deleted file, offer to write it.
1250 minibuffer-auto-raise))
1259 ;; separately for each file, in sync with post-command hooks,
1260 ;; with the new buffer current:
1274 ;; hooks may be specific to current buffer:
1277 ;; When the buffer is killed, inform the clients.
1284 client-record))
1291 This buries the buffer, then returns a list of the form (NEXT-BUFFER KILLED).
1292 NEXT-BUFFER is another server buffer, as a suggestion for what to select next,
1293 or nil. KILLED is t if we killed BUFFER (typically, because it was visiting
1294 a temp file).
1295 FOR-KILLING if non-nil indicates that we are called from `kill-buffer'."
1304 ;; Delete all dead buffers from PROC.
1310 ;; If client now has no pending buffers,
1311 ;; tell it that it is done, and forget it entirely.
1315 ;; `server-delete-client' might delete the client's
1316 ;; frames, which might change the current buffer. We
1317 ;; don't want that (bug#640).
1322 ;; We may or may not kill this buffer;
1323 ;; if we do, do not call server-buffer-done recursively
1324 ;; from kill-buffer-hook.
1329 ;; Notice whether server-done-hook killed the buffer.
1332 ;; Don't bother killing or burying the buffer
1333 ;; when we are called from kill-buffer.
1336 server-kill-new-buffers
1341 ;; Prevent kill-buffer from prompting (Bug#3696).
1356 "Return non-nil if BUFFER contains a file considered temporary.
1357 These are files whose names suggest they are repeatedly
1358 reused to pass information to another program.
1360 The variable `server-temp-file-regexp' controls which filenames
1361 are considered temporary."
1367 This kills or buries the buffer, then returns a list
1368 of the form (NEXT-BUFFER KILLED). NEXT-BUFFER is another server buffer,
1369 as a suggestion for what to select next, or nil.
1370 KILLED is t if we killed BUFFER, which happens if it was created
1371 specifically for the clients and did not exist before their request for it."
1374 ;; For a temp file, save, and do make a non-numeric backup
1375 ;; (unless make-backup-files is nil).
1380 buffer-file-name
1385 ;; Ask before killing a server buffer.
1386 ;; It was suggested to release its client instead,
1387 ;; but I think that is dangerous--the client would proceed
1388 ;; using whatever is on disk in that file. -- rms.
1390 "Ask before killing a server buffer."
1397 res)
1402 "Ask before exiting Emacs if it has live clients."
1409 live-client)
1413 "Remove the current buffer from its clients' buffer list.
1414 Designed to be added to `kill-buffer-hook'."
1415 ;; Prevent infinite recursion if user has made server-done-hook
1416 ;; call kill-buffer.
1422 \f
1426 The buffer is also killed if it did not exist before the clients asked for it.
1429 Temporary files such as MH <draft> files are always saved and backed up,
1430 no questions asked. (The variable `make-backup-files', if nil, still
1431 inhibits a backup; you can set it locally in a particular buffer to
1432 prevent a backup for it.) The variable `server-temp-file-regexp' controls
1433 which filenames are considered temporary.
1435 If invoked with a prefix argument, or if there is no server process running,
1447 "Switch to another buffer, preferably one that has a client.
1448 Arg NEXT-BUFFER is a suggestion; if it is a live buffer, use it.
1450 KILLED-ONE is t in a recursive call if we have already killed one
1451 temp-file server buffer. This means we should avoid the final
1453 done that.
1455 FILEPOS specifies a new buffer position for NEXT-BUFFER, if we
1456 visit NEXT-BUFFER in an existing window. If non-nil, it should
1457 be a cons cell (LINENUMBER . COLUMNNUMBER)."
1463 ;; Only look at frameless clients, or those in the selected
1464 ;; frame.
1471 ;; (switch-to-buffer (other-buffer))
1474 ;; If NEXT-BUFFER is a dead buffer, remove the server records for it
1475 ;; and try the next surviving server buffer.
1477 ;; OK, we know next-buffer is live, let's display and select it.
1482 ;; The buffer is already displayed: just reuse the
1483 ;; window. If FILEPOS is non-nil, use it to replace the
1484 ;; window's own value of point.
1490 ;; Otherwise, let's find an appropriate window.
1499 ;; Move to a non-dedicated window, if we have one.
1510 ;; After all the above, we might still have ended up with
1511 ;; a minibuffer/dedicated-window (if there's no other).
1516 ;;;###autoload
1518 ;; Called from save-buffers-kill-terminal in files.el.
1519 "Offer to save each buffer, then kill the current client.
1520 With ARG non-nil, silently save all file-visiting buffers, then kill.
1522 If emacsclient was started with a list of filenames to edit, then
1523 only these files will be asked to be saved."
1526 ;; Nowait frames have no client buffer list.
1530 ;; If we're the last frame standing, kill Emacs.
1534 ;; If client is bufferless, emulate a normal Emacs exit
1535 ;; and offer to save all buffers. Otherwise, offer to
1536 ;; save only the buffers belonging to the client.
1540 t))
1547 "Unload the server library."
1554 ;; continue standard unloading
1555 nil)
1558 "Contact the Emacs server named SERVER and evaluate FORM there.
1559 Returns the result of the evaluation, or signals an error if it
1560 cannot contact the specified server. For example:
1567 address port secret process)
1584 :host address
1598 ;; If the result is nil, there's nothing in the buffer. If the
1599 ;; result is non-nil, it's after "-print ".
1611 \f
1614 ;;; server.el ends here