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