Commit | Line | Data |
---|---|---|
efb859b4 | 1 | /* Client process that communicates with GNU Emacs acting as server. |
20c396e8 | 2 | Copyright (C) 1986, 1987, 1994, 1999, 2000, 2001, 2003 |
de073ce3 | 3 | Free Software Foundation, Inc. |
46cec291 RS |
4 | |
5 | This file is part of GNU Emacs. | |
6 | ||
7 | GNU Emacs is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
92af894f | 9 | the Free Software Foundation; either version 2, or (at your option) |
46cec291 RS |
10 | any later version. |
11 | ||
12 | GNU Emacs is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GNU Emacs; see the file COPYING. If not, write to | |
3b7ad313 EN |
19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
20 | Boston, MA 02111-1307, USA. */ | |
46cec291 RS |
21 | |
22 | ||
23 | #define NO_SHORTNAMES | |
e69233c2 PJ |
24 | |
25 | #ifdef HAVE_CONFIG_H | |
2f8fe2f4 | 26 | #include <config.h> |
e69233c2 PJ |
27 | #endif |
28 | ||
4e23f2ba | 29 | #undef signal |
46cec291 | 30 | |
e69233c2 | 31 | #include <ctype.h> |
8f9aaa0a RS |
32 | #include <stdio.h> |
33 | #include <getopt.h> | |
79f13bba DL |
34 | #ifdef HAVE_UNISTD_H |
35 | #include <unistd.h> | |
36 | #endif | |
8f9aaa0a | 37 | |
9f637eea GM |
38 | #ifdef VMS |
39 | # include "vms-pwd.h" | |
40 | #else | |
41 | # include <pwd.h> | |
42 | #endif /* not VMS */ | |
43 | ||
8f9aaa0a RS |
44 | char *getenv (), *getwd (); |
45 | char *getcwd (); | |
8f9aaa0a RS |
46 | |
47 | /* This is defined with -D from the compilation command, | |
48 | which extracts it from ../lisp/version.el. */ | |
49 | ||
50 | #ifndef VERSION | |
51 | #define VERSION "unspecified" | |
52 | #endif | |
53 | \f | |
54 | /* Name used to invoke this program. */ | |
55 | char *progname; | |
56 | ||
749ae770 | 57 | /* Nonzero means don't wait for a response from Emacs. --no-wait. */ |
8f9aaa0a RS |
58 | int nowait = 0; |
59 | ||
30be2360 SM |
60 | /* Nonzero means args are expressions to be evaluated. --eval. */ |
61 | int eval = 0; | |
62 | ||
63 | /* The display on which Emacs should work. --display. */ | |
64 | char *display = NULL; | |
65 | ||
66 | /* If non-NULL, the name of an editor to fallback to if the server | |
67 | is not running. --alternate-editor. */ | |
68 | const char * alternate_editor = NULL; | |
69 | ||
3db926be | 70 | /* If non-NULL, the filename of the UNIX socket. */ |
254107e4 RS |
71 | char *socket_name = NULL; |
72 | ||
7f3bff3e AS |
73 | void print_help_and_exit (); |
74 | ||
8f9aaa0a RS |
75 | struct option longopts[] = |
76 | { | |
749ae770 | 77 | { "no-wait", no_argument, NULL, 'n' }, |
30be2360 | 78 | { "eval", no_argument, NULL, 'e' }, |
8f9aaa0a RS |
79 | { "help", no_argument, NULL, 'H' }, |
80 | { "version", no_argument, NULL, 'V' }, | |
3cf8c6aa | 81 | { "alternate-editor", required_argument, NULL, 'a' }, |
254107e4 | 82 | { "socket-name", required_argument, NULL, 's' }, |
30be2360 SM |
83 | { "display", required_argument, NULL, 'd' }, |
84 | { 0, 0, 0, 0 } | |
8f9aaa0a RS |
85 | }; |
86 | ||
87 | /* Decode the options from argv and argc. | |
5212210c | 88 | The global variable `optind' will say how many arguments we used up. */ |
8f9aaa0a | 89 | |
5212210c | 90 | void |
8f9aaa0a RS |
91 | decode_options (argc, argv) |
92 | int argc; | |
93 | char **argv; | |
94 | { | |
95 | while (1) | |
96 | { | |
97 | int opt = getopt_long (argc, argv, | |
254107e4 | 98 | "VHnea:s:d:", longopts, 0); |
8f9aaa0a RS |
99 | |
100 | if (opt == EOF) | |
101 | break; | |
102 | ||
97e3214d | 103 | alternate_editor = getenv ("ALTERNATE_EDITOR"); |
e69233c2 | 104 | |
8f9aaa0a RS |
105 | switch (opt) |
106 | { | |
107 | case 0: | |
108 | /* If getopt returns 0, then it has already processed a | |
109 | long-named option. We should do nothing. */ | |
110 | break; | |
e69233c2 | 111 | |
97e3214d GM |
112 | case 'a': |
113 | alternate_editor = optarg; | |
114 | break; | |
e69233c2 | 115 | |
254107e4 RS |
116 | case 's': |
117 | socket_name = optarg; | |
118 | break; | |
119 | ||
30be2360 SM |
120 | case 'd': |
121 | display = optarg; | |
122 | break; | |
123 | ||
8f9aaa0a RS |
124 | case 'n': |
125 | nowait = 1; | |
126 | break; | |
127 | ||
30be2360 SM |
128 | case 'e': |
129 | eval = 1; | |
130 | break; | |
131 | ||
8f9aaa0a | 132 | case 'V': |
20c396e8 JB |
133 | printf ("emacsclient %s\n", VERSION); |
134 | exit (0); | |
8f9aaa0a | 135 | break; |
46cec291 | 136 | |
8f9aaa0a | 137 | case 'H': |
8f9aaa0a | 138 | print_help_and_exit (); |
20c396e8 JB |
139 | break; |
140 | ||
141 | default: | |
142 | fprintf (stderr, "Try `%s --help' for more information\n", progname); | |
143 | exit (1); | |
144 | break; | |
8f9aaa0a RS |
145 | } |
146 | } | |
8f9aaa0a RS |
147 | } |
148 | ||
7f3bff3e | 149 | void |
8f9aaa0a RS |
150 | print_help_and_exit () |
151 | { | |
20c396e8 JB |
152 | printf ( |
153 | "Usage: %s [OPTIONS] FILE...\n\ | |
30be2360 SM |
154 | Tell the Emacs server to visit the specified files.\n\ |
155 | Every FILE can be either just a FILENAME or [+LINE[:COLUMN]] FILENAME.\n\ | |
20c396e8 | 156 | \n\ |
30be2360 SM |
157 | The following OPTIONS are accepted:\n\ |
158 | -V, --version Just print a version info and return\n\ | |
159 | -H, --help Print this usage information message\n\ | |
160 | -n, --no-wait Don't wait for the server to return\n\ | |
161 | -e, --eval Evaluate the FILE arguments as ELisp expressions\n\ | |
162 | -d, --display=DISPLAY Visit the file in the given display\n\ | |
254107e4 RS |
163 | -s, --socket-name=FILENAME\n\ |
164 | Set the filename of the UNIX socket for communication\n\ | |
30be2360 SM |
165 | -a, --alternate-editor=EDITOR\n\ |
166 | Editor to fallback to if the server is not running\n\ | |
20c396e8 | 167 | \n\ |
30be2360 | 168 | Report bugs to bug-gnu-emacs@gnu.org.\n", progname); |
20c396e8 | 169 | exit (0); |
8f9aaa0a | 170 | } |
5212210c | 171 | |
f1db6a73 | 172 | /* Return a copy of NAME, inserting a & |
3cf8c6aa | 173 | before each &, each space, each newline, and any initial -. |
5212210c RS |
174 | Change spaces to underscores, too, so that the |
175 | return value never contains a space. */ | |
176 | ||
177 | char * | |
178 | quote_file_name (name) | |
179 | char *name; | |
180 | { | |
181 | char *copy = (char *) malloc (strlen (name) * 2 + 1); | |
182 | char *p, *q; | |
183 | ||
184 | p = name; | |
185 | q = copy; | |
186 | while (*p) | |
187 | { | |
188 | if (*p == ' ') | |
189 | { | |
f1db6a73 | 190 | *q++ = '&'; |
5212210c RS |
191 | *q++ = '_'; |
192 | p++; | |
193 | } | |
3cf8c6aa SM |
194 | else if (*p == '\n') |
195 | { | |
196 | *q++ = '&'; | |
197 | *q++ = 'n'; | |
198 | p++; | |
199 | } | |
5212210c RS |
200 | else |
201 | { | |
f1db6a73 RS |
202 | if (*p == '&' || (*p == '-' && p == name)) |
203 | *q++ = '&'; | |
5212210c RS |
204 | *q++ = *p++; |
205 | } | |
206 | } | |
f1db6a73 | 207 | *q++ = 0; |
5212210c RS |
208 | |
209 | return copy; | |
210 | } | |
0c76956f | 211 | |
0c76956f RS |
212 | /* Like malloc but get fatal error if memory is exhausted. */ |
213 | ||
5497dfdb | 214 | long * |
0c76956f RS |
215 | xmalloc (size) |
216 | unsigned int size; | |
217 | { | |
5f32a712 | 218 | long *result = (long *) malloc (size); |
0c76956f RS |
219 | if (result == NULL) |
220 | { | |
221 | perror ("malloc"); | |
222 | exit (1); | |
223 | } | |
224 | return result; | |
225 | } | |
8f9aaa0a | 226 | \f |
97e3214d GM |
227 | /* |
228 | Try to run a different command, or --if no alternate editor is | |
229 | defined-- exit with an errorcode. | |
230 | */ | |
de073ce3 | 231 | void |
97e3214d GM |
232 | fail (argc, argv) |
233 | int argc; | |
234 | char **argv; | |
235 | { | |
236 | if (alternate_editor) | |
237 | { | |
3cf8c6aa | 238 | int i = optind - 1; |
97e3214d | 239 | execvp (alternate_editor, argv + i); |
23431241 | 240 | return; |
97e3214d GM |
241 | } |
242 | else | |
243 | { | |
244 | exit (1); | |
245 | } | |
246 | } | |
247 | ||
248 | ||
97e3214d | 249 | \f |
30be2360 | 250 | #if !defined (HAVE_SOCKETS) || defined (NO_SOCKETS_IN_FILE_SYSTEM) |
46cec291 | 251 | |
de073ce3 | 252 | int |
46cec291 RS |
253 | main (argc, argv) |
254 | int argc; | |
255 | char **argv; | |
256 | { | |
257 | fprintf (stderr, "%s: Sorry, the Emacs server is supported only\n", | |
258 | argv[0]); | |
30be2360 | 259 | fprintf (stderr, "on systems with Berkeley sockets.\n"); |
97e3214d GM |
260 | |
261 | fail (argc, argv); | |
46cec291 RS |
262 | } |
263 | ||
30be2360 | 264 | #else /* HAVE_SOCKETS */ |
46cec291 RS |
265 | |
266 | #include <sys/types.h> | |
267 | #include <sys/socket.h> | |
268 | #include <sys/un.h> | |
efb859b4 | 269 | #include <sys/stat.h> |
46cec291 RS |
270 | #include <errno.h> |
271 | ||
92af894f | 272 | extern char *strerror (); |
46cec291 RS |
273 | extern int errno; |
274 | ||
9f637eea GM |
275 | /* Three possibilities: |
276 | 2 - can't be `stat'ed (sets errno) | |
277 | 1 - isn't owned by us | |
278 | 0 - success: none of the above */ | |
279 | ||
280 | static int | |
281 | socket_status (socket_name) | |
282 | char *socket_name; | |
283 | { | |
284 | struct stat statbfr; | |
285 | ||
286 | if (stat (socket_name, &statbfr) == -1) | |
287 | return 2; | |
288 | ||
289 | if (statbfr.st_uid != geteuid ()) | |
290 | return 1; | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
340ff9de | 295 | int |
46cec291 RS |
296 | main (argc, argv) |
297 | int argc; | |
298 | char **argv; | |
299 | { | |
a2b3f2b5 RS |
300 | char *system_name; |
301 | int system_name_length; | |
3cf8c6aa | 302 | int s, i, needlf = 0; |
23a7488d | 303 | FILE *out, *in; |
46cec291 | 304 | struct sockaddr_un server; |
571512de | 305 | char *cwd, *str; |
46cec291 | 306 | char string[BUFSIZ]; |
8f9aaa0a RS |
307 | |
308 | progname = argv[0]; | |
46cec291 | 309 | |
8f9aaa0a | 310 | /* Process options. */ |
5212210c | 311 | decode_options (argc, argv); |
46cec291 | 312 | |
5212210c | 313 | if (argc - optind < 1) |
20c396e8 JB |
314 | { |
315 | fprintf (stderr, "%s: file name or argument required\n", progname); | |
316 | fprintf (stderr, "Try `%s --help' for more information\n", progname); | |
317 | exit (1); | |
318 | } | |
46cec291 | 319 | |
e69233c2 | 320 | /* |
46cec291 RS |
321 | * Open up an AF_UNIX socket in this person's home directory |
322 | */ | |
323 | ||
324 | if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0) | |
325 | { | |
326 | fprintf (stderr, "%s: ", argv[0]); | |
327 | perror ("socket"); | |
97e3214d | 328 | fail (argc, argv); |
46cec291 | 329 | } |
e69233c2 | 330 | |
46cec291 | 331 | server.sun_family = AF_UNIX; |
c5fee545 | 332 | |
efb859b4 | 333 | { |
3ecdcd59 | 334 | char *dot; |
a2b3f2b5 RS |
335 | system_name_length = 32; |
336 | ||
337 | while (1) | |
338 | { | |
339 | system_name = (char *) xmalloc (system_name_length + 1); | |
340 | ||
341 | /* system_name must be null-terminated string. */ | |
342 | system_name[system_name_length] = '\0'; | |
343 | ||
344 | if (gethostname (system_name, system_name_length) == 0) | |
345 | break; | |
346 | ||
347 | free (system_name); | |
348 | system_name_length *= 2; | |
349 | } | |
3ecdcd59 SM |
350 | |
351 | /* We always use the non-dotted host name, for simplicity. */ | |
352 | dot = index (system_name, '.'); | |
353 | if (dot) | |
354 | *dot = '\0'; | |
c5fee545 KH |
355 | } |
356 | ||
c5fee545 | 357 | { |
9f637eea | 358 | int sock_status = 0; |
efb859b4 | 359 | |
254107e4 RS |
360 | if (! socket_name) |
361 | { | |
362 | socket_name = alloca (system_name_length + 100); | |
363 | sprintf (socket_name, "/tmp/emacs%d-%s/server", | |
364 | (int) geteuid (), system_name); | |
365 | } | |
366 | ||
367 | if (strlen (socket_name) < sizeof (server.sun_path)) | |
368 | strcpy (server.sun_path, socket_name); | |
369 | else | |
370 | fprintf (stderr, "%s: socket-name %s too long", | |
371 | argv[0], socket_name); | |
efb859b4 | 372 | |
9f637eea GM |
373 | /* See if the socket exists, and if it's owned by us. */ |
374 | sock_status = socket_status (server.sun_path); | |
375 | if (sock_status) | |
efb859b4 | 376 | { |
9f637eea GM |
377 | /* Failing that, see if LOGNAME or USER exist and differ from |
378 | our euid. If so, look for a socket based on the UID | |
379 | associated with the name. This is reminiscent of the logic | |
380 | that init_editfns uses to set the global Vuser_full_name. */ | |
e69233c2 | 381 | |
9f637eea GM |
382 | char *user_name = (char *) getenv ("LOGNAME"); |
383 | if (!user_name) | |
384 | user_name = (char *) getenv ("USER"); | |
e69233c2 | 385 | |
9f637eea GM |
386 | if (user_name) |
387 | { | |
388 | struct passwd *pw = getpwnam (user_name); | |
389 | if (pw && (pw->pw_uid != geteuid ())) | |
390 | { | |
391 | /* We're running under su, apparently. */ | |
392 | sprintf (server.sun_path, "/tmp/esrv%d-%s", | |
23431241 | 393 | (int) pw->pw_uid, system_name); |
9f637eea GM |
394 | sock_status = socket_status (server.sun_path); |
395 | } | |
396 | } | |
efb859b4 | 397 | } |
e69233c2 | 398 | |
9f637eea GM |
399 | switch (sock_status) |
400 | { | |
401 | case 1: | |
402 | /* There's a socket, but it isn't owned by us. This is OK if | |
403 | we are root. */ | |
404 | if (0 != geteuid ()) | |
405 | { | |
406 | fprintf (stderr, "%s: Invalid socket owner\n", argv[0]); | |
407 | fail (argc, argv); | |
408 | } | |
409 | break; | |
e69233c2 | 410 | |
9f637eea GM |
411 | case 2: |
412 | /* `stat' failed */ | |
413 | if (errno == ENOENT) | |
414 | fprintf (stderr, | |
45adde32 SE |
415 | "%s: can't find socket; have you started the server?\n\ |
416 | To start the server in Emacs, type \"M-x server-start\".\n", | |
9f637eea GM |
417 | argv[0]); |
418 | else | |
419 | fprintf (stderr, "%s: can't stat %s: %s\n", | |
420 | argv[0], server.sun_path, strerror (errno)); | |
421 | fail (argc, argv); | |
422 | break; | |
423 | } | |
efb859b4 | 424 | } |
46cec291 | 425 | |
4e23f2ba JB |
426 | if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2) |
427 | < 0) | |
46cec291 RS |
428 | { |
429 | fprintf (stderr, "%s: ", argv[0]); | |
430 | perror ("connect"); | |
97e3214d | 431 | fail (argc, argv); |
46cec291 | 432 | } |
23a7488d RS |
433 | |
434 | /* We use the stream OUT to send our command to the server. */ | |
46cec291 RS |
435 | if ((out = fdopen (s, "r+")) == NULL) |
436 | { | |
437 | fprintf (stderr, "%s: ", argv[0]); | |
438 | perror ("fdopen"); | |
97e3214d | 439 | fail (argc, argv); |
46cec291 RS |
440 | } |
441 | ||
23a7488d RS |
442 | /* We use the stream IN to read the response. |
443 | We used to use just one stream for both output and input | |
444 | on the socket, but reversing direction works nonportably: | |
445 | on some systems, the output appears as the first input; | |
446 | on other systems it does not. */ | |
447 | if ((in = fdopen (s, "r+")) == NULL) | |
448 | { | |
449 | fprintf (stderr, "%s: ", argv[0]); | |
450 | perror ("fdopen"); | |
97e3214d | 451 | fail (argc, argv); |
23a7488d RS |
452 | } |
453 | ||
38732dba | 454 | #ifdef HAVE_GETCWD |
ee6a193c | 455 | cwd = getcwd (string, sizeof string); |
38732dba RS |
456 | #else |
457 | cwd = getwd (string); | |
ee6a193c | 458 | #endif |
46cec291 RS |
459 | if (cwd == 0) |
460 | { | |
461 | /* getwd puts message in STRING if it fails. */ | |
bb5618fe | 462 | |
38732dba | 463 | #ifdef HAVE_GETCWD |
bb5618fe JB |
464 | fprintf (stderr, "%s: %s (%s)\n", argv[0], |
465 | "Cannot get current working directory", strerror (errno)); | |
38732dba | 466 | #else |
bb5618fe | 467 | fprintf (stderr, "%s: %s (%s)\n", argv[0], string, strerror (errno)); |
bd252662 | 468 | #endif |
97e3214d | 469 | fail (argc, argv); |
46cec291 RS |
470 | } |
471 | ||
5212210c RS |
472 | if (nowait) |
473 | fprintf (out, "-nowait "); | |
292d74a3 | 474 | |
30be2360 SM |
475 | if (eval) |
476 | fprintf (out, "-eval "); | |
477 | ||
478 | if (display) | |
479 | fprintf (out, "-display %s ", quote_file_name (display)); | |
480 | ||
5212210c RS |
481 | for (i = optind; i < argc; i++) |
482 | { | |
30be2360 SM |
483 | if (eval) |
484 | ; /* Don't prepend any cwd or anything like that. */ | |
485 | else if (*argv[i] == '+') | |
46cec291 RS |
486 | { |
487 | char *p = argv[i] + 1; | |
cb1cdedd | 488 | while (isdigit ((unsigned char) *p) || *p == ':') p++; |
46cec291 | 489 | if (*p != 0) |
0343a017 | 490 | fprintf (out, "%s/", quote_file_name (cwd)); |
46cec291 RS |
491 | } |
492 | else if (*argv[i] != '/') | |
0343a017 | 493 | fprintf (out, "%s/", quote_file_name (cwd)); |
5212210c RS |
494 | |
495 | fprintf (out, "%s ", quote_file_name (argv[i])); | |
46cec291 RS |
496 | } |
497 | fprintf (out, "\n"); | |
498 | fflush (out); | |
499 | ||
292d74a3 RS |
500 | /* Maybe wait for an answer. */ |
501 | if (nowait) | |
502 | return 0; | |
503 | ||
30be2360 SM |
504 | if (!eval) |
505 | { | |
506 | printf ("Waiting for Emacs..."); | |
507 | needlf = 2; | |
508 | } | |
46cec291 RS |
509 | fflush (stdout); |
510 | ||
3cf8c6aa | 511 | /* Now, wait for an answer and print any messages. */ |
e69233c2 | 512 | while ((str = fgets (string, BUFSIZ, in))) |
3cf8c6aa SM |
513 | { |
514 | if (needlf == 2) | |
515 | printf ("\n"); | |
516 | printf ("%s", str); | |
517 | needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n'; | |
518 | } | |
519 | ||
520 | if (needlf) | |
521 | printf ("\n"); | |
522 | fflush (stdout); | |
23a7488d | 523 | |
340ff9de | 524 | return 0; |
46cec291 RS |
525 | } |
526 | ||
30be2360 | 527 | #endif /* HAVE_SOCKETS */ |
27711600 RM |
528 | \f |
529 | #ifndef HAVE_STRERROR | |
530 | char * | |
531 | strerror (errnum) | |
532 | int errnum; | |
533 | { | |
534 | extern char *sys_errlist[]; | |
535 | extern int sys_nerr; | |
536 | ||
537 | if (errnum >= 0 && errnum < sys_nerr) | |
538 | return sys_errlist[errnum]; | |
539 | return (char *) "Unknown error"; | |
540 | } | |
541 | ||
542 | #endif /* ! HAVE_STRERROR */ | |
ab5796a9 MB |
543 | |
544 | /* arch-tag: f39bb9c4-73eb-477e-896d-50832e2ca9a7 | |
545 | (do not change this comment) */ |