Commit | Line | Data |
---|---|---|
efb859b4 | 1 | /* Client process that communicates with GNU Emacs acting as server. |
de073ce3 GM |
2 | Copyright (C) 1986, 1987, 1994, 1999, 2000, 2001 |
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': |
b4e94f42 | 125 | fprintf (stderr, "emacsclient %s\n", VERSION); |
8f9aaa0a RS |
126 | exit (1); |
127 | break; | |
46cec291 | 128 | |
8f9aaa0a RS |
129 | case 'H': |
130 | default: | |
131 | print_help_and_exit (); | |
132 | } | |
133 | } | |
8f9aaa0a RS |
134 | } |
135 | ||
7f3bff3e | 136 | void |
8f9aaa0a RS |
137 | print_help_and_exit () |
138 | { | |
139 | fprintf (stderr, | |
30be2360 SM |
140 | "Usage: %s [OPTIONS] FILE...\n\ |
141 | Tell the Emacs server to visit the specified files.\n\ | |
142 | Every FILE can be either just a FILENAME or [+LINE[:COLUMN]] FILENAME.\n\ | |
143 | The following OPTIONS are accepted:\n\ | |
144 | -V, --version Just print a version info and return\n\ | |
145 | -H, --help Print this usage information message\n\ | |
146 | -n, --no-wait Don't wait for the server to return\n\ | |
147 | -e, --eval Evaluate the FILE arguments as ELisp expressions\n\ | |
148 | -d, --display=DISPLAY Visit the file in the given display\n\ | |
149 | -a, --alternate-editor=EDITOR\n\ | |
150 | Editor to fallback to if the server is not running\n\ | |
151 | Report bugs to bug-gnu-emacs@gnu.org.\n", progname); | |
8f9aaa0a RS |
152 | exit (1); |
153 | } | |
5212210c | 154 | |
f1db6a73 | 155 | /* Return a copy of NAME, inserting a & |
3cf8c6aa | 156 | before each &, each space, each newline, and any initial -. |
5212210c RS |
157 | Change spaces to underscores, too, so that the |
158 | return value never contains a space. */ | |
159 | ||
160 | char * | |
161 | quote_file_name (name) | |
162 | char *name; | |
163 | { | |
164 | char *copy = (char *) malloc (strlen (name) * 2 + 1); | |
165 | char *p, *q; | |
166 | ||
167 | p = name; | |
168 | q = copy; | |
169 | while (*p) | |
170 | { | |
171 | if (*p == ' ') | |
172 | { | |
f1db6a73 | 173 | *q++ = '&'; |
5212210c RS |
174 | *q++ = '_'; |
175 | p++; | |
176 | } | |
3cf8c6aa SM |
177 | else if (*p == '\n') |
178 | { | |
179 | *q++ = '&'; | |
180 | *q++ = 'n'; | |
181 | p++; | |
182 | } | |
5212210c RS |
183 | else |
184 | { | |
f1db6a73 RS |
185 | if (*p == '&' || (*p == '-' && p == name)) |
186 | *q++ = '&'; | |
5212210c RS |
187 | *q++ = *p++; |
188 | } | |
189 | } | |
f1db6a73 | 190 | *q++ = 0; |
5212210c RS |
191 | |
192 | return copy; | |
193 | } | |
0c76956f | 194 | |
0c76956f RS |
195 | /* Like malloc but get fatal error if memory is exhausted. */ |
196 | ||
5497dfdb | 197 | long * |
0c76956f RS |
198 | xmalloc (size) |
199 | unsigned int size; | |
200 | { | |
5f32a712 | 201 | long *result = (long *) malloc (size); |
0c76956f RS |
202 | if (result == NULL) |
203 | { | |
204 | perror ("malloc"); | |
205 | exit (1); | |
206 | } | |
207 | return result; | |
208 | } | |
8f9aaa0a | 209 | \f |
97e3214d GM |
210 | /* |
211 | Try to run a different command, or --if no alternate editor is | |
212 | defined-- exit with an errorcode. | |
213 | */ | |
de073ce3 | 214 | void |
97e3214d GM |
215 | fail (argc, argv) |
216 | int argc; | |
217 | char **argv; | |
218 | { | |
219 | if (alternate_editor) | |
220 | { | |
3cf8c6aa | 221 | int i = optind - 1; |
97e3214d | 222 | execvp (alternate_editor, argv + i); |
23431241 | 223 | return; |
97e3214d GM |
224 | } |
225 | else | |
226 | { | |
227 | exit (1); | |
228 | } | |
229 | } | |
230 | ||
231 | ||
97e3214d | 232 | \f |
30be2360 | 233 | #if !defined (HAVE_SOCKETS) || defined (NO_SOCKETS_IN_FILE_SYSTEM) |
46cec291 | 234 | |
de073ce3 | 235 | int |
46cec291 RS |
236 | main (argc, argv) |
237 | int argc; | |
238 | char **argv; | |
239 | { | |
240 | fprintf (stderr, "%s: Sorry, the Emacs server is supported only\n", | |
241 | argv[0]); | |
30be2360 | 242 | fprintf (stderr, "on systems with Berkeley sockets.\n"); |
97e3214d GM |
243 | |
244 | fail (argc, argv); | |
46cec291 RS |
245 | } |
246 | ||
30be2360 | 247 | #else /* HAVE_SOCKETS */ |
46cec291 RS |
248 | |
249 | #include <sys/types.h> | |
250 | #include <sys/socket.h> | |
251 | #include <sys/un.h> | |
efb859b4 | 252 | #include <sys/stat.h> |
46cec291 RS |
253 | #include <errno.h> |
254 | ||
92af894f | 255 | extern char *strerror (); |
46cec291 RS |
256 | extern int errno; |
257 | ||
9f637eea GM |
258 | /* Three possibilities: |
259 | 2 - can't be `stat'ed (sets errno) | |
260 | 1 - isn't owned by us | |
261 | 0 - success: none of the above */ | |
262 | ||
263 | static int | |
264 | socket_status (socket_name) | |
265 | char *socket_name; | |
266 | { | |
267 | struct stat statbfr; | |
268 | ||
269 | if (stat (socket_name, &statbfr) == -1) | |
270 | return 2; | |
271 | ||
272 | if (statbfr.st_uid != geteuid ()) | |
273 | return 1; | |
274 | ||
275 | return 0; | |
276 | } | |
277 | ||
340ff9de | 278 | int |
46cec291 RS |
279 | main (argc, argv) |
280 | int argc; | |
281 | char **argv; | |
282 | { | |
a2b3f2b5 RS |
283 | char *system_name; |
284 | int system_name_length; | |
3cf8c6aa | 285 | int s, i, needlf = 0; |
23a7488d | 286 | FILE *out, *in; |
46cec291 | 287 | struct sockaddr_un server; |
571512de | 288 | char *cwd, *str; |
46cec291 | 289 | char string[BUFSIZ]; |
8f9aaa0a RS |
290 | |
291 | progname = argv[0]; | |
46cec291 | 292 | |
8f9aaa0a | 293 | /* Process options. */ |
5212210c | 294 | decode_options (argc, argv); |
46cec291 | 295 | |
5212210c | 296 | if (argc - optind < 1) |
8f9aaa0a | 297 | print_help_and_exit (); |
46cec291 | 298 | |
e69233c2 | 299 | /* |
46cec291 RS |
300 | * Open up an AF_UNIX socket in this person's home directory |
301 | */ | |
302 | ||
303 | if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0) | |
304 | { | |
305 | fprintf (stderr, "%s: ", argv[0]); | |
306 | perror ("socket"); | |
97e3214d | 307 | fail (argc, argv); |
46cec291 | 308 | } |
e69233c2 | 309 | |
46cec291 | 310 | server.sun_family = AF_UNIX; |
c5fee545 | 311 | |
efb859b4 | 312 | { |
3ecdcd59 | 313 | char *dot; |
a2b3f2b5 RS |
314 | system_name_length = 32; |
315 | ||
316 | while (1) | |
317 | { | |
318 | system_name = (char *) xmalloc (system_name_length + 1); | |
319 | ||
320 | /* system_name must be null-terminated string. */ | |
321 | system_name[system_name_length] = '\0'; | |
322 | ||
323 | if (gethostname (system_name, system_name_length) == 0) | |
324 | break; | |
325 | ||
326 | free (system_name); | |
327 | system_name_length *= 2; | |
328 | } | |
3ecdcd59 SM |
329 | |
330 | /* We always use the non-dotted host name, for simplicity. */ | |
331 | dot = index (system_name, '.'); | |
332 | if (dot) | |
333 | *dot = '\0'; | |
c5fee545 KH |
334 | } |
335 | ||
c5fee545 | 336 | { |
9f637eea | 337 | int sock_status = 0; |
efb859b4 | 338 | |
23431241 | 339 | sprintf (server.sun_path, "/tmp/esrv%d-%s", (int) geteuid (), system_name); |
efb859b4 | 340 | |
9f637eea GM |
341 | /* See if the socket exists, and if it's owned by us. */ |
342 | sock_status = socket_status (server.sun_path); | |
343 | if (sock_status) | |
efb859b4 | 344 | { |
9f637eea GM |
345 | /* Failing that, see if LOGNAME or USER exist and differ from |
346 | our euid. If so, look for a socket based on the UID | |
347 | associated with the name. This is reminiscent of the logic | |
348 | that init_editfns uses to set the global Vuser_full_name. */ | |
e69233c2 | 349 | |
9f637eea GM |
350 | char *user_name = (char *) getenv ("LOGNAME"); |
351 | if (!user_name) | |
352 | user_name = (char *) getenv ("USER"); | |
e69233c2 | 353 | |
9f637eea GM |
354 | if (user_name) |
355 | { | |
356 | struct passwd *pw = getpwnam (user_name); | |
357 | if (pw && (pw->pw_uid != geteuid ())) | |
358 | { | |
359 | /* We're running under su, apparently. */ | |
360 | sprintf (server.sun_path, "/tmp/esrv%d-%s", | |
23431241 | 361 | (int) pw->pw_uid, system_name); |
9f637eea GM |
362 | sock_status = socket_status (server.sun_path); |
363 | } | |
364 | } | |
efb859b4 | 365 | } |
e69233c2 | 366 | |
9f637eea GM |
367 | switch (sock_status) |
368 | { | |
369 | case 1: | |
370 | /* There's a socket, but it isn't owned by us. This is OK if | |
371 | we are root. */ | |
372 | if (0 != geteuid ()) | |
373 | { | |
374 | fprintf (stderr, "%s: Invalid socket owner\n", argv[0]); | |
375 | fail (argc, argv); | |
376 | } | |
377 | break; | |
e69233c2 | 378 | |
9f637eea GM |
379 | case 2: |
380 | /* `stat' failed */ | |
381 | if (errno == ENOENT) | |
382 | fprintf (stderr, | |
45adde32 SE |
383 | "%s: can't find socket; have you started the server?\n\ |
384 | To start the server in Emacs, type \"M-x server-start\".\n", | |
9f637eea GM |
385 | argv[0]); |
386 | else | |
387 | fprintf (stderr, "%s: can't stat %s: %s\n", | |
388 | argv[0], server.sun_path, strerror (errno)); | |
389 | fail (argc, argv); | |
390 | break; | |
391 | } | |
efb859b4 | 392 | } |
46cec291 | 393 | |
4e23f2ba JB |
394 | if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2) |
395 | < 0) | |
46cec291 RS |
396 | { |
397 | fprintf (stderr, "%s: ", argv[0]); | |
398 | perror ("connect"); | |
97e3214d | 399 | fail (argc, argv); |
46cec291 | 400 | } |
23a7488d RS |
401 | |
402 | /* We use the stream OUT to send our command to the server. */ | |
46cec291 RS |
403 | if ((out = fdopen (s, "r+")) == NULL) |
404 | { | |
405 | fprintf (stderr, "%s: ", argv[0]); | |
406 | perror ("fdopen"); | |
97e3214d | 407 | fail (argc, argv); |
46cec291 RS |
408 | } |
409 | ||
23a7488d RS |
410 | /* We use the stream IN to read the response. |
411 | We used to use just one stream for both output and input | |
412 | on the socket, but reversing direction works nonportably: | |
413 | on some systems, the output appears as the first input; | |
414 | on other systems it does not. */ | |
415 | if ((in = fdopen (s, "r+")) == NULL) | |
416 | { | |
417 | fprintf (stderr, "%s: ", argv[0]); | |
418 | perror ("fdopen"); | |
97e3214d | 419 | fail (argc, argv); |
23a7488d RS |
420 | } |
421 | ||
38732dba | 422 | #ifdef HAVE_GETCWD |
ee6a193c | 423 | cwd = getcwd (string, sizeof string); |
38732dba RS |
424 | #else |
425 | cwd = getwd (string); | |
ee6a193c | 426 | #endif |
46cec291 RS |
427 | if (cwd == 0) |
428 | { | |
429 | /* getwd puts message in STRING if it fails. */ | |
bd252662 | 430 | fprintf (stderr, "%s: %s (%s)\n", argv[0], |
38732dba | 431 | #ifdef HAVE_GETCWD |
bd252662 | 432 | "Cannot get current working directory", |
38732dba RS |
433 | #else |
434 | string, | |
bd252662 RS |
435 | #endif |
436 | strerror (errno)); | |
97e3214d | 437 | fail (argc, argv); |
46cec291 RS |
438 | } |
439 | ||
5212210c RS |
440 | if (nowait) |
441 | fprintf (out, "-nowait "); | |
292d74a3 | 442 | |
30be2360 SM |
443 | if (eval) |
444 | fprintf (out, "-eval "); | |
445 | ||
446 | if (display) | |
447 | fprintf (out, "-display %s ", quote_file_name (display)); | |
448 | ||
5212210c RS |
449 | for (i = optind; i < argc; i++) |
450 | { | |
30be2360 SM |
451 | if (eval) |
452 | ; /* Don't prepend any cwd or anything like that. */ | |
453 | else if (*argv[i] == '+') | |
46cec291 RS |
454 | { |
455 | char *p = argv[i] + 1; | |
cb1cdedd | 456 | while (isdigit ((unsigned char) *p) || *p == ':') p++; |
46cec291 | 457 | if (*p != 0) |
0343a017 | 458 | fprintf (out, "%s/", quote_file_name (cwd)); |
46cec291 RS |
459 | } |
460 | else if (*argv[i] != '/') | |
0343a017 | 461 | fprintf (out, "%s/", quote_file_name (cwd)); |
5212210c RS |
462 | |
463 | fprintf (out, "%s ", quote_file_name (argv[i])); | |
46cec291 RS |
464 | } |
465 | fprintf (out, "\n"); | |
466 | fflush (out); | |
467 | ||
292d74a3 RS |
468 | /* Maybe wait for an answer. */ |
469 | if (nowait) | |
470 | return 0; | |
471 | ||
30be2360 SM |
472 | if (!eval) |
473 | { | |
474 | printf ("Waiting for Emacs..."); | |
475 | needlf = 2; | |
476 | } | |
46cec291 RS |
477 | fflush (stdout); |
478 | ||
3cf8c6aa | 479 | /* Now, wait for an answer and print any messages. */ |
e69233c2 | 480 | while ((str = fgets (string, BUFSIZ, in))) |
3cf8c6aa SM |
481 | { |
482 | if (needlf == 2) | |
483 | printf ("\n"); | |
484 | printf ("%s", str); | |
485 | needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n'; | |
486 | } | |
487 | ||
488 | if (needlf) | |
489 | printf ("\n"); | |
490 | fflush (stdout); | |
23a7488d | 491 | |
340ff9de | 492 | return 0; |
46cec291 RS |
493 | } |
494 | ||
30be2360 | 495 | #endif /* HAVE_SOCKETS */ |
27711600 RM |
496 | \f |
497 | #ifndef HAVE_STRERROR | |
498 | char * | |
499 | strerror (errnum) | |
500 | int errnum; | |
501 | { | |
502 | extern char *sys_errlist[]; | |
503 | extern int sys_nerr; | |
504 | ||
505 | if (errnum >= 0 && errnum < sys_nerr) | |
506 | return sys_errlist[errnum]; | |
507 | return (char *) "Unknown error"; | |
508 | } | |
509 | ||
510 | #endif /* ! HAVE_STRERROR */ |