Commit | Line | Data |
---|---|---|
efb859b4 | 1 | /* Client process that communicates with GNU Emacs acting as server. |
92b47a4a TTN |
2 | Copyright (C) 1986, 1987, 1994, 1999, 2000, 2001, 2002, 2003, 2004, |
3 | 2005 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 | |
364c38d3 LK |
19 | the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
20 | Boston, MA 02110-1301, 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 | ||
9628b887 | 44 | #include <signal.h> |
4d553a13 | 45 | #include <errno.h> |
9628b887 KL |
46 | |
47 | \f | |
8f9aaa0a | 48 | char *getenv (), *getwd (); |
5b9562c3 | 49 | char *(getcwd) (); |
8f9aaa0a | 50 | |
8f9aaa0a RS |
51 | #ifndef VERSION |
52 | #define VERSION "unspecified" | |
53 | #endif | |
54 | \f | |
55 | /* Name used to invoke this program. */ | |
56 | char *progname; | |
57 | ||
0a125897 KL |
58 | /* The first argument to main. */ |
59 | int main_argc; | |
60 | ||
61 | /* The second argument to main. */ | |
62 | char **main_argv; | |
63 | ||
749ae770 | 64 | /* Nonzero means don't wait for a response from Emacs. --no-wait. */ |
8f9aaa0a RS |
65 | int nowait = 0; |
66 | ||
30be2360 SM |
67 | /* Nonzero means args are expressions to be evaluated. --eval. */ |
68 | int eval = 0; | |
69 | ||
92071250 KL |
70 | /* Nonzero means don't open a new frame. --current-frame. */ |
71 | int current_frame = 0; | |
72 | ||
77134727 KL |
73 | /* Nonzero means open a new graphical frame. */ |
74 | int window_system = 0; | |
75 | ||
30be2360 SM |
76 | /* The display on which Emacs should work. --display. */ |
77 | char *display = NULL; | |
78 | ||
9628b887 | 79 | /* Nonzero means open a new Emacs frame on the current terminal. */ |
77134727 | 80 | int tty = 0; |
9628b887 | 81 | |
30be2360 SM |
82 | /* If non-NULL, the name of an editor to fallback to if the server |
83 | is not running. --alternate-editor. */ | |
84 | const char * alternate_editor = NULL; | |
85 | ||
3db926be | 86 | /* If non-NULL, the filename of the UNIX socket. */ |
254107e4 RS |
87 | char *socket_name = NULL; |
88 | ||
7f3bff3e AS |
89 | void print_help_and_exit (); |
90 | ||
8f9aaa0a RS |
91 | struct option longopts[] = |
92 | { | |
749ae770 | 93 | { "no-wait", no_argument, NULL, 'n' }, |
30be2360 | 94 | { "eval", no_argument, NULL, 'e' }, |
8f9aaa0a RS |
95 | { "help", no_argument, NULL, 'H' }, |
96 | { "version", no_argument, NULL, 'V' }, | |
b28c910d | 97 | { "tty", no_argument, NULL, 't' }, |
e5299d8d | 98 | { "current-frame", no_argument, NULL, 'c' }, |
3cf8c6aa | 99 | { "alternate-editor", required_argument, NULL, 'a' }, |
254107e4 | 100 | { "socket-name", required_argument, NULL, 's' }, |
30be2360 SM |
101 | { "display", required_argument, NULL, 'd' }, |
102 | { 0, 0, 0, 0 } | |
8f9aaa0a RS |
103 | }; |
104 | ||
105 | /* Decode the options from argv and argc. | |
5212210c | 106 | The global variable `optind' will say how many arguments we used up. */ |
8f9aaa0a | 107 | |
5212210c | 108 | void |
8f9aaa0a RS |
109 | decode_options (argc, argv) |
110 | int argc; | |
111 | char **argv; | |
112 | { | |
b6b6d6d2 | 113 | alternate_editor = getenv ("ALTERNATE_EDITOR"); |
77134727 | 114 | display = getenv ("DISPLAY"); |
8689463a | 115 | if (display && strlen (display) == 0) |
e5299d8d | 116 | display = NULL; |
0b0d3e0b | 117 | |
8f9aaa0a RS |
118 | while (1) |
119 | { | |
120 | int opt = getopt_long (argc, argv, | |
e5299d8d | 121 | "VHnea:s:d:tc", longopts, 0); |
8f9aaa0a RS |
122 | |
123 | if (opt == EOF) | |
124 | break; | |
125 | ||
126 | switch (opt) | |
127 | { | |
128 | case 0: | |
129 | /* If getopt returns 0, then it has already processed a | |
130 | long-named option. We should do nothing. */ | |
131 | break; | |
e69233c2 | 132 | |
97e3214d GM |
133 | case 'a': |
134 | alternate_editor = optarg; | |
135 | break; | |
e69233c2 | 136 | |
254107e4 RS |
137 | case 's': |
138 | socket_name = optarg; | |
139 | break; | |
140 | ||
30be2360 SM |
141 | case 'd': |
142 | display = optarg; | |
143 | break; | |
144 | ||
8f9aaa0a RS |
145 | case 'n': |
146 | nowait = 1; | |
147 | break; | |
148 | ||
30be2360 SM |
149 | case 'e': |
150 | eval = 1; | |
151 | break; | |
152 | ||
8f9aaa0a | 153 | case 'V': |
20c396e8 | 154 | printf ("emacsclient %s\n", VERSION); |
65396510 | 155 | exit (EXIT_SUCCESS); |
8f9aaa0a | 156 | break; |
46cec291 | 157 | |
819b8f00 | 158 | case 't': |
77134727 | 159 | tty = 1; |
77134727 KL |
160 | break; |
161 | ||
e5299d8d | 162 | case 'c': |
92071250 | 163 | current_frame = 1; |
9628b887 | 164 | break; |
0b0d3e0b | 165 | |
8f9aaa0a | 166 | case 'H': |
8f9aaa0a | 167 | print_help_and_exit (); |
20c396e8 JB |
168 | break; |
169 | ||
170 | default: | |
171 | fprintf (stderr, "Try `%s --help' for more information\n", progname); | |
65396510 | 172 | exit (EXIT_FAILURE); |
20c396e8 | 173 | break; |
8f9aaa0a RS |
174 | } |
175 | } | |
9628b887 | 176 | |
92071250 KL |
177 | if (!tty && display) |
178 | window_system = 1; | |
179 | else | |
180 | tty = 1; | |
181 | ||
182 | /* `emacsclient --no-wait' should open a new permanent frame, then exit. | |
183 | Otherwise, --no-wait always implies --current-frame. */ | |
184 | if (nowait && argc - optind > 0) | |
185 | current_frame = 1; | |
186 | ||
187 | if (current_frame) | |
188 | { | |
189 | tty = 0; | |
190 | window_system = 0; | |
191 | } | |
192 | ||
193 | if (tty) | |
194 | window_system = 0; | |
8f9aaa0a RS |
195 | } |
196 | ||
7f3bff3e | 197 | void |
8f9aaa0a RS |
198 | print_help_and_exit () |
199 | { | |
20c396e8 JB |
200 | printf ( |
201 | "Usage: %s [OPTIONS] FILE...\n\ | |
30be2360 SM |
202 | Tell the Emacs server to visit the specified files.\n\ |
203 | Every FILE can be either just a FILENAME or [+LINE[:COLUMN]] FILENAME.\n\ | |
20c396e8 | 204 | \n\ |
30be2360 SM |
205 | The following OPTIONS are accepted:\n\ |
206 | -V, --version Just print a version info and return\n\ | |
207 | -H, --help Print this usage information message\n\ | |
819b8f00 | 208 | -t, --tty Open a new Emacs frame on the current terminal\n\ |
e5299d8d | 209 | -c, --current-frame Do not create a new frame; use the current Emacs frame\n\ |
30be2360 SM |
210 | -n, --no-wait Don't wait for the server to return\n\ |
211 | -e, --eval Evaluate the FILE arguments as ELisp expressions\n\ | |
212 | -d, --display=DISPLAY Visit the file in the given display\n\ | |
254107e4 RS |
213 | -s, --socket-name=FILENAME\n\ |
214 | Set the filename of the UNIX socket for communication\n\ | |
30be2360 SM |
215 | -a, --alternate-editor=EDITOR\n\ |
216 | Editor to fallback to if the server is not running\n\ | |
20c396e8 | 217 | \n\ |
30be2360 | 218 | Report bugs to bug-gnu-emacs@gnu.org.\n", progname); |
65396510 | 219 | exit (EXIT_SUCCESS); |
8f9aaa0a | 220 | } |
5212210c | 221 | |
9002956f KL |
222 | /* Like malloc but get fatal error if memory is exhausted. */ |
223 | ||
224 | long * | |
225 | xmalloc (size) | |
226 | unsigned int size; | |
227 | { | |
228 | long *result = (long *) malloc (size); | |
229 | if (result == NULL) | |
230 | { | |
231 | perror ("malloc"); | |
ab4b17be | 232 | exit (EXIT_FAILURE); |
9002956f KL |
233 | } |
234 | return result; | |
235 | } | |
236 | ||
237 | /* Like strdup but get a fatal error if memory is exhausted. */ | |
238 | ||
239 | char * | |
240 | xstrdup (const char *s) | |
241 | { | |
242 | char *result = strdup (s); | |
243 | if (result == NULL) | |
244 | { | |
245 | perror ("strdup"); | |
ab4b17be | 246 | exit (EXIT_FAILURE); |
9002956f KL |
247 | } |
248 | return result; | |
249 | } | |
250 | ||
0b0d3e0b | 251 | /* In STR, insert a & before each &, each space, each newline, and |
a4cf2096 | 252 | any initial -. Change spaces to underscores, too, so that the |
0b0d3e0b KL |
253 | return value never contains a space. |
254 | ||
255 | Does not change the string. Outputs the result to STREAM. */ | |
5212210c | 256 | |
87209357 | 257 | void |
0b0d3e0b KL |
258 | quote_argument (str, stream) |
259 | char *str; | |
87209357 | 260 | FILE *stream; |
5212210c | 261 | { |
9002956f | 262 | char *copy = (char *) xmalloc (strlen (str) * 2 + 1); |
5212210c RS |
263 | char *p, *q; |
264 | ||
0b0d3e0b | 265 | p = str; |
5212210c RS |
266 | q = copy; |
267 | while (*p) | |
268 | { | |
269 | if (*p == ' ') | |
270 | { | |
f1db6a73 | 271 | *q++ = '&'; |
5212210c RS |
272 | *q++ = '_'; |
273 | p++; | |
274 | } | |
3cf8c6aa SM |
275 | else if (*p == '\n') |
276 | { | |
277 | *q++ = '&'; | |
278 | *q++ = 'n'; | |
279 | p++; | |
280 | } | |
5212210c RS |
281 | else |
282 | { | |
0b0d3e0b | 283 | if (*p == '&' || (*p == '-' && p == str)) |
f1db6a73 | 284 | *q++ = '&'; |
5212210c RS |
285 | *q++ = *p++; |
286 | } | |
287 | } | |
f1db6a73 | 288 | *q++ = 0; |
5212210c | 289 | |
60879731 | 290 | fprintf (stream, "%s", copy); |
87209357 EZ |
291 | |
292 | free (copy); | |
5212210c | 293 | } |
0c76956f | 294 | |
0b0d3e0b KL |
295 | |
296 | /* The inverse of quote_argument. Removes quoting in string STR by | |
297 | modifying the string in place. Returns STR. */ | |
298 | ||
299 | char * | |
300 | unquote_argument (str) | |
301 | char *str; | |
302 | { | |
303 | char *p, *q; | |
304 | ||
305 | if (! str) | |
306 | return str; | |
307 | ||
308 | p = str; | |
309 | q = str; | |
310 | while (*p) | |
311 | { | |
312 | if (*p == '&') | |
313 | { | |
314 | p++; | |
315 | if (*p == '&') | |
316 | *p = '&'; | |
317 | else if (*p == '_') | |
318 | *p = ' '; | |
319 | else if (*p == 'n') | |
320 | *p = '\n'; | |
321 | else if (*p == '-') | |
322 | *p = '-'; | |
323 | } | |
324 | *q++ = *p++; | |
325 | } | |
326 | *q = 0; | |
327 | return str; | |
328 | } | |
329 | ||
8f9aaa0a | 330 | \f |
97e3214d GM |
331 | /* |
332 | Try to run a different command, or --if no alternate editor is | |
333 | defined-- exit with an errorcode. | |
334 | */ | |
de073ce3 | 335 | void |
819b8f00 | 336 | fail (void) |
97e3214d GM |
337 | { |
338 | if (alternate_editor) | |
339 | { | |
3cf8c6aa | 340 | int i = optind - 1; |
0a125897 | 341 | execvp (alternate_editor, main_argv + i); |
23431241 | 342 | return; |
97e3214d GM |
343 | } |
344 | else | |
345 | { | |
65396510 | 346 | exit (EXIT_FAILURE); |
97e3214d GM |
347 | } |
348 | } | |
349 | ||
0b0d3e0b | 350 | /* The process id of Emacs. */ |
6548cf00 | 351 | int emacs_pid; |
9628b887 | 352 | |
0b0d3e0b KL |
353 | /* File handles for communicating with Emacs. */ |
354 | FILE *out, *in; | |
355 | ||
da8e1115 KL |
356 | /* A signal handler that passes the signal to the Emacs process. |
357 | Useful for SIGWINCH. */ | |
358 | ||
9628b887 | 359 | SIGTYPE |
428a555e | 360 | pass_signal_to_emacs (int signalnum) |
9628b887 KL |
361 | { |
362 | int old_errno = errno; | |
363 | ||
9f729af5 | 364 | if (emacs_pid) |
428a555e | 365 | kill (emacs_pid, signalnum); |
9f729af5 | 366 | |
428a555e | 367 | signal (signalnum, pass_signal_to_emacs); |
9f729af5 KL |
368 | errno = old_errno; |
369 | } | |
370 | ||
0b0d3e0b KL |
371 | /* Signal handler for SIGCONT; notify the Emacs process that it can |
372 | now resume our tty frame. */ | |
373 | ||
374 | SIGTYPE | |
375 | handle_sigcont (int signalnum) | |
376 | { | |
377 | int old_errno = errno; | |
378 | ||
379 | if (tcgetpgrp (1) == getpgrp ()) | |
380 | { | |
381 | /* We are in the foreground. */ | |
382 | fprintf (out, "-resume \n"); | |
383 | fflush (out); | |
384 | fsync (fileno (out)); | |
385 | } | |
386 | else | |
387 | { | |
388 | /* We are in the background; cancel the continue. */ | |
389 | kill (getpid (), SIGSTOP); | |
390 | } | |
c6c53c3e KL |
391 | |
392 | signal (signalnum, handle_sigcont); | |
0b0d3e0b KL |
393 | errno = old_errno; |
394 | } | |
395 | ||
396 | /* Signal handler for SIGTSTP; notify the Emacs process that we are | |
397 | going to sleep. Normally the suspend is initiated by Emacs via | |
398 | server-handle-suspend-tty, but if the server gets out of sync with | |
399 | reality, we may get a SIGTSTP on C-z. Handling this signal and | |
400 | notifying Emacs about it should get things under control again. */ | |
401 | ||
402 | SIGTYPE | |
403 | handle_sigtstp (int signalnum) | |
404 | { | |
405 | int old_errno = errno; | |
406 | sigset_t set; | |
407 | ||
408 | if (out) | |
409 | { | |
410 | fprintf (out, "-suspend \n"); | |
411 | fflush (out); | |
412 | fsync (fileno (out)); | |
413 | } | |
414 | ||
415 | /* Unblock this signal and call the default handler by temprarily | |
416 | changing the handler and resignalling. */ | |
417 | sigprocmask (SIG_BLOCK, NULL, &set); | |
418 | sigdelset (&set, signalnum); | |
419 | signal (signalnum, SIG_DFL); | |
420 | kill (getpid (), signalnum); | |
421 | sigprocmask (SIG_SETMASK, &set, NULL); /* Let's the above signal through. */ | |
422 | signal (signalnum, handle_sigtstp); | |
423 | ||
424 | errno = old_errno; | |
425 | } | |
426 | ||
da8e1115 | 427 | /* Set up signal handlers before opening a frame on the current tty. */ |
0b0d3e0b | 428 | |
4d553a13 KL |
429 | void |
430 | init_signals (void) | |
9628b887 KL |
431 | { |
432 | /* Set up signal handlers. */ | |
428a555e | 433 | signal (SIGWINCH, pass_signal_to_emacs); |
4ca927b4 KL |
434 | |
435 | /* Don't pass SIGINT and SIGQUIT to Emacs, because it has no way of | |
436 | deciding which terminal the signal came from. C-g is now a | |
437 | normal input event on secondary terminals. */ | |
438 | #if 0 | |
428a555e KL |
439 | signal (SIGINT, pass_signal_to_emacs); |
440 | signal (SIGQUIT, pass_signal_to_emacs); | |
4ca927b4 | 441 | #endif |
0b0d3e0b KL |
442 | |
443 | signal (SIGCONT, handle_sigcont); | |
444 | signal (SIGTSTP, handle_sigtstp); | |
445 | signal (SIGTTOU, handle_sigtstp); | |
9628b887 KL |
446 | } |
447 | ||
97e3214d | 448 | \f |
30be2360 | 449 | #if !defined (HAVE_SOCKETS) || defined (NO_SOCKETS_IN_FILE_SYSTEM) |
46cec291 | 450 | |
de073ce3 | 451 | int |
46cec291 RS |
452 | main (argc, argv) |
453 | int argc; | |
454 | char **argv; | |
455 | { | |
456 | fprintf (stderr, "%s: Sorry, the Emacs server is supported only\n", | |
457 | argv[0]); | |
30be2360 | 458 | fprintf (stderr, "on systems with Berkeley sockets.\n"); |
97e3214d | 459 | |
819b8f00 | 460 | fail (); |
46cec291 RS |
461 | } |
462 | ||
30be2360 | 463 | #else /* HAVE_SOCKETS */ |
46cec291 RS |
464 | |
465 | #include <sys/types.h> | |
466 | #include <sys/socket.h> | |
467 | #include <sys/un.h> | |
efb859b4 | 468 | #include <sys/stat.h> |
46cec291 RS |
469 | #include <errno.h> |
470 | ||
92af894f | 471 | extern char *strerror (); |
46cec291 RS |
472 | extern int errno; |
473 | ||
9f637eea GM |
474 | /* Three possibilities: |
475 | 2 - can't be `stat'ed (sets errno) | |
476 | 1 - isn't owned by us | |
477 | 0 - success: none of the above */ | |
478 | ||
479 | static int | |
480 | socket_status (socket_name) | |
481 | char *socket_name; | |
482 | { | |
483 | struct stat statbfr; | |
484 | ||
485 | if (stat (socket_name, &statbfr) == -1) | |
486 | return 2; | |
487 | ||
488 | if (statbfr.st_uid != geteuid ()) | |
489 | return 1; | |
490 | ||
491 | return 0; | |
492 | } | |
493 | ||
4d553a13 KL |
494 | /* Returns 1 if PREFIX is a prefix of STRING. */ |
495 | static int | |
496 | strprefix (char *prefix, char *string) | |
497 | { | |
498 | int i; | |
499 | if (! prefix) | |
500 | return 1; | |
501 | ||
502 | if (!string) | |
503 | return 0; | |
0b0d3e0b | 504 | |
4d553a13 KL |
505 | for (i = 0; prefix[i]; i++) |
506 | if (!string[i] || string[i] != prefix[i]) | |
507 | return 0; | |
508 | return 1; | |
509 | } | |
510 | ||
340ff9de | 511 | int |
46cec291 RS |
512 | main (argc, argv) |
513 | int argc; | |
514 | char **argv; | |
515 | { | |
3cf8c6aa | 516 | int s, i, needlf = 0; |
46cec291 | 517 | struct sockaddr_un server; |
571512de | 518 | char *cwd, *str; |
46cec291 | 519 | char string[BUFSIZ]; |
8f9aaa0a | 520 | |
0a125897 KL |
521 | main_argc = argc; |
522 | main_argv = argv; | |
8f9aaa0a | 523 | progname = argv[0]; |
46cec291 | 524 | |
8f9aaa0a | 525 | /* Process options. */ |
5212210c | 526 | decode_options (argc, argv); |
46cec291 | 527 | |
77134727 | 528 | if ((argc - optind < 1) && !eval && !tty && !window_system) |
20c396e8 JB |
529 | { |
530 | fprintf (stderr, "%s: file name or argument required\n", progname); | |
531 | fprintf (stderr, "Try `%s --help' for more information\n", progname); | |
65396510 | 532 | exit (EXIT_FAILURE); |
20c396e8 | 533 | } |
46cec291 | 534 | |
e69233c2 | 535 | /* |
46cec291 RS |
536 | * Open up an AF_UNIX socket in this person's home directory |
537 | */ | |
538 | ||
539 | if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0) | |
540 | { | |
541 | fprintf (stderr, "%s: ", argv[0]); | |
542 | perror ("socket"); | |
819b8f00 | 543 | fail (); |
46cec291 | 544 | } |
e69233c2 | 545 | |
46cec291 | 546 | server.sun_family = AF_UNIX; |
c5fee545 | 547 | |
c5fee545 | 548 | { |
9f637eea | 549 | int sock_status = 0; |
5c9659d3 | 550 | int default_sock = !socket_name; |
b80bf66e | 551 | int saved_errno = 0; |
0b0d3e0b | 552 | |
d3a6748c | 553 | char *server_name = "server"; |
0b0d3e0b | 554 | |
d3a6748c KL |
555 | if (socket_name && !index (socket_name, '/') && !index (socket_name, '\\')) |
556 | { /* socket_name is a file name component. */ | |
557 | server_name = socket_name; | |
558 | socket_name = NULL; | |
559 | default_sock = 1; /* Try both UIDs. */ | |
560 | } | |
efb859b4 | 561 | |
d3a6748c | 562 | if (default_sock) |
254107e4 | 563 | { |
d3a6748c KL |
564 | socket_name = alloca (100 + strlen (server_name)); |
565 | sprintf (socket_name, "/tmp/emacs%d/%s", | |
566 | (int) geteuid (), server_name); | |
254107e4 RS |
567 | } |
568 | ||
569 | if (strlen (socket_name) < sizeof (server.sun_path)) | |
570 | strcpy (server.sun_path, socket_name); | |
571 | else | |
819b8f00 KL |
572 | { |
573 | fprintf (stderr, "%s: socket-name %s too long", | |
574 | argv[0], socket_name); | |
575 | fail (); | |
576 | } | |
efb859b4 | 577 | |
9f637eea GM |
578 | /* See if the socket exists, and if it's owned by us. */ |
579 | sock_status = socket_status (server.sun_path); | |
152b6e83 | 580 | saved_errno = errno; |
5c9659d3 | 581 | if (sock_status && default_sock) |
efb859b4 | 582 | { |
9f637eea GM |
583 | /* Failing that, see if LOGNAME or USER exist and differ from |
584 | our euid. If so, look for a socket based on the UID | |
585 | associated with the name. This is reminiscent of the logic | |
586 | that init_editfns uses to set the global Vuser_full_name. */ | |
e69233c2 | 587 | |
9f637eea | 588 | char *user_name = (char *) getenv ("LOGNAME"); |
293f9f2a | 589 | |
9f637eea GM |
590 | if (!user_name) |
591 | user_name = (char *) getenv ("USER"); | |
e69233c2 | 592 | |
9f637eea GM |
593 | if (user_name) |
594 | { | |
595 | struct passwd *pw = getpwnam (user_name); | |
293f9f2a | 596 | |
9f637eea GM |
597 | if (pw && (pw->pw_uid != geteuid ())) |
598 | { | |
599 | /* We're running under su, apparently. */ | |
0734b0d0 SM |
600 | socket_name = alloca (100 + strlen (server_name)); |
601 | sprintf (socket_name, "/tmp/emacs%d/%s", | |
602 | (int) pw->pw_uid, server_name); | |
5c9659d3 SM |
603 | |
604 | if (strlen (socket_name) < sizeof (server.sun_path)) | |
605 | strcpy (server.sun_path, socket_name); | |
606 | else | |
607 | { | |
608 | fprintf (stderr, "%s: socket-name %s too long", | |
609 | argv[0], socket_name); | |
65396510 | 610 | exit (EXIT_FAILURE); |
5c9659d3 SM |
611 | } |
612 | ||
9f637eea | 613 | sock_status = socket_status (server.sun_path); |
b80bf66e | 614 | saved_errno = errno; |
9f637eea | 615 | } |
293f9f2a RS |
616 | else |
617 | errno = saved_errno; | |
9f637eea | 618 | } |
efb859b4 | 619 | } |
e69233c2 | 620 | |
9f637eea GM |
621 | switch (sock_status) |
622 | { | |
623 | case 1: | |
624 | /* There's a socket, but it isn't owned by us. This is OK if | |
625 | we are root. */ | |
626 | if (0 != geteuid ()) | |
627 | { | |
628 | fprintf (stderr, "%s: Invalid socket owner\n", argv[0]); | |
819b8f00 | 629 | fail (); |
9f637eea GM |
630 | } |
631 | break; | |
e69233c2 | 632 | |
9f637eea GM |
633 | case 2: |
634 | /* `stat' failed */ | |
152b6e83 | 635 | if (saved_errno == ENOENT) |
9f637eea | 636 | fprintf (stderr, |
9002956f | 637 | "%s: can't find socket; have you started the server?\n\ |
45adde32 | 638 | To start the server in Emacs, type \"M-x server-start\".\n", |
9f637eea GM |
639 | argv[0]); |
640 | else | |
9002956f | 641 | fprintf (stderr, "%s: can't stat %s: %s\n", |
152b6e83 | 642 | argv[0], server.sun_path, strerror (saved_errno)); |
819b8f00 | 643 | fail (); |
9f637eea GM |
644 | break; |
645 | } | |
efb859b4 | 646 | } |
46cec291 | 647 | |
4e23f2ba JB |
648 | if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2) |
649 | < 0) | |
46cec291 RS |
650 | { |
651 | fprintf (stderr, "%s: ", argv[0]); | |
652 | perror ("connect"); | |
819b8f00 | 653 | fail (); |
46cec291 | 654 | } |
23a7488d | 655 | |
9002956f | 656 | /* We use the stream OUT to send our commands to the server. */ |
46cec291 RS |
657 | if ((out = fdopen (s, "r+")) == NULL) |
658 | { | |
659 | fprintf (stderr, "%s: ", argv[0]); | |
660 | perror ("fdopen"); | |
819b8f00 | 661 | fail (); |
46cec291 RS |
662 | } |
663 | ||
9002956f | 664 | /* We use the stream IN to read the responses. |
23a7488d RS |
665 | We used to use just one stream for both output and input |
666 | on the socket, but reversing direction works nonportably: | |
667 | on some systems, the output appears as the first input; | |
668 | on other systems it does not. */ | |
669 | if ((in = fdopen (s, "r+")) == NULL) | |
670 | { | |
671 | fprintf (stderr, "%s: ", argv[0]); | |
672 | perror ("fdopen"); | |
819b8f00 | 673 | fail (); |
23a7488d RS |
674 | } |
675 | ||
38732dba | 676 | #ifdef HAVE_GETCWD |
ee6a193c | 677 | cwd = getcwd (string, sizeof string); |
38732dba RS |
678 | #else |
679 | cwd = getwd (string); | |
ee6a193c | 680 | #endif |
46cec291 RS |
681 | if (cwd == 0) |
682 | { | |
683 | /* getwd puts message in STRING if it fails. */ | |
bb5618fe | 684 | |
38732dba | 685 | #ifdef HAVE_GETCWD |
bb5618fe | 686 | fprintf (stderr, "%s: %s (%s)\n", argv[0], |
9002956f | 687 | "cannot get current working directory", strerror (errno)); |
38732dba | 688 | #else |
bb5618fe | 689 | fprintf (stderr, "%s: %s (%s)\n", argv[0], string, strerror (errno)); |
bd252662 | 690 | #endif |
819b8f00 | 691 | fail (); |
46cec291 RS |
692 | } |
693 | ||
a9298135 KL |
694 | /* First of all, send our version number for verification. */ |
695 | fprintf (out, "-version %s ", VERSION); | |
0b0d3e0b | 696 | |
9002956f KL |
697 | /* Send over our environment. */ |
698 | { | |
699 | extern char **environ; | |
700 | int i; | |
701 | for (i = 0; environ[i]; i++) | |
702 | { | |
703 | char *name = xstrdup (environ[i]); | |
704 | char *value = strchr (name, '='); | |
705 | if (value && strlen (value) > 1) | |
706 | { | |
707 | *value++ = 0; | |
708 | fprintf (out, "-env "); | |
709 | quote_argument (name, out); | |
710 | fprintf (out, " "); | |
711 | quote_argument (value, out); | |
712 | fprintf (out, " "); | |
713 | fflush (out); | |
714 | } | |
715 | free (name); | |
716 | } | |
717 | } | |
718 | ||
6afdd335 | 719 | retry: |
5212210c RS |
720 | if (nowait) |
721 | fprintf (out, "-nowait "); | |
292d74a3 | 722 | |
92071250 KL |
723 | if (current_frame) |
724 | fprintf (out, "-current-frame "); | |
725 | ||
30be2360 | 726 | if (display) |
87209357 EZ |
727 | { |
728 | fprintf (out, "-display "); | |
0b0d3e0b | 729 | quote_argument (display, out); |
87209357 EZ |
730 | fprintf (out, " "); |
731 | } | |
30be2360 | 732 | |
77134727 | 733 | if (tty) |
9628b887 | 734 | { |
4d553a13 | 735 | char *tty_name = ttyname (fileno (stdin)); |
2fc0cf2a | 736 | char *type = getenv ("TERM"); |
0b0d3e0b | 737 | |
4d553a13 | 738 | if (! tty_name) |
2fc0cf2a KL |
739 | { |
740 | fprintf (stderr, "%s: could not get terminal name\n", progname); | |
741 | fail (); | |
742 | } | |
743 | ||
744 | if (! type) | |
745 | { | |
746 | fprintf (stderr, "%s: please set the TERM variable to your terminal type\n", | |
747 | progname); | |
748 | fail (); | |
749 | } | |
750 | ||
751 | if (! strcmp (type, "eterm")) | |
752 | { | |
753 | /* This causes nasty, MULTI_KBOARD-related input lockouts. */ | |
754 | fprintf (stderr, "%s: opening a frame in an Emacs term buffer" | |
755 | " is not supported\n", progname); | |
756 | fail (); | |
757 | } | |
0b0d3e0b | 758 | |
4d553a13 | 759 | init_signals (); |
0b0d3e0b | 760 | |
819b8f00 | 761 | fprintf (out, "-tty "); |
0b0d3e0b | 762 | quote_argument (tty_name, out); |
9628b887 | 763 | fprintf (out, " "); |
0b0d3e0b | 764 | quote_argument (type, out); |
9628b887 KL |
765 | fprintf (out, " "); |
766 | } | |
77134727 KL |
767 | |
768 | if (window_system) | |
769 | fprintf (out, "-window-system "); | |
0b0d3e0b | 770 | |
87209357 | 771 | if ((argc - optind > 0)) |
5212210c | 772 | { |
87209357 | 773 | for (i = optind; i < argc; i++) |
46cec291 | 774 | { |
0b0d3e0b KL |
775 | int relative = 0; |
776 | ||
87209357 | 777 | if (eval) |
0b0d3e0b KL |
778 | { |
779 | /* Don't prepend any cwd or anything like that. */ | |
780 | fprintf (out, "-eval "); | |
781 | quote_argument (argv[i], out); | |
782 | fprintf (out, " "); | |
783 | continue; | |
784 | } | |
785 | ||
786 | if (*argv[i] == '+') | |
787 | { | |
87209357 EZ |
788 | char *p = argv[i] + 1; |
789 | while (isdigit ((unsigned char) *p) || *p == ':') p++; | |
0b0d3e0b KL |
790 | if (*p == 0) |
791 | { | |
792 | fprintf (out, "-position "); | |
793 | quote_argument (argv[i], out); | |
794 | fprintf (out, " "); | |
795 | continue; | |
796 | } | |
797 | else | |
798 | relative = 1; | |
799 | } | |
800 | else if (*argv[i] != '/') | |
801 | relative = 1; | |
802 | ||
803 | fprintf (out, "-file "); | |
804 | if (relative) | |
805 | { | |
806 | quote_argument (cwd, out); | |
807 | fprintf (out, "/"); | |
808 | } | |
809 | quote_argument (argv[i], out); | |
810 | fprintf (out, " "); | |
811 | } | |
46cec291 | 812 | } |
87209357 EZ |
813 | else |
814 | { | |
77134727 | 815 | if (!tty && !window_system) |
9628b887 KL |
816 | { |
817 | while ((str = fgets (string, BUFSIZ, stdin))) | |
818 | { | |
0b0d3e0b KL |
819 | if (eval) |
820 | fprintf (out, "-eval "); | |
821 | else | |
822 | fprintf (out, "-file "); | |
823 | quote_argument (str, out); | |
9628b887 KL |
824 | } |
825 | fprintf (out, " "); | |
826 | } | |
87209357 | 827 | } |
0b0d3e0b | 828 | |
46cec291 RS |
829 | fprintf (out, "\n"); |
830 | fflush (out); | |
0b0d3e0b | 831 | fsync (fileno (out)); |
46cec291 | 832 | |
fc2040c0 KL |
833 | /* Wait for an answer. */ |
834 | if (!eval && !tty && !nowait) | |
30be2360 SM |
835 | { |
836 | printf ("Waiting for Emacs..."); | |
837 | needlf = 2; | |
838 | } | |
46cec291 | 839 | fflush (stdout); |
0b0d3e0b | 840 | fsync (1); |
46cec291 | 841 | |
3cf8c6aa | 842 | /* Now, wait for an answer and print any messages. */ |
e69233c2 | 843 | while ((str = fgets (string, BUFSIZ, in))) |
3cf8c6aa | 844 | { |
0b0d3e0b KL |
845 | char *p = str + strlen (str) - 1; |
846 | while (p > str && *p == '\n') | |
847 | *p-- = 0; | |
848 | ||
a9298135 KL |
849 | if (strprefix ("-good-version ", str)) |
850 | { | |
6afdd335 | 851 | /* -good-version: The versions match. */ |
a9298135 | 852 | } |
a9298135 | 853 | else if (strprefix ("-emacs-pid ", str)) |
4d553a13 | 854 | { |
6afdd335 | 855 | /* -emacs-pid PID: The process id of the Emacs process. */ |
77134727 KL |
856 | emacs_pid = strtol (string + strlen ("-emacs-pid"), NULL, 10); |
857 | } | |
6afdd335 KL |
858 | else if (strprefix ("-window-system-unsupported ", str)) |
859 | { | |
860 | /* -window-system-unsupported: Emacs was compiled without X | |
861 | support. Try again on the terminal. */ | |
862 | window_system = 0; | |
863 | nowait = 0; | |
864 | tty = 1; | |
865 | goto retry; | |
866 | } | |
77134727 KL |
867 | else if (strprefix ("-print ", str)) |
868 | { | |
6afdd335 | 869 | /* -print STRING: Print STRING on the terminal. */ |
0b0d3e0b KL |
870 | str = unquote_argument (str + strlen ("-print ")); |
871 | if (needlf) | |
77134727 | 872 | printf ("\n"); |
0b0d3e0b KL |
873 | printf ("%s", str); |
874 | needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n'; | |
77134727 KL |
875 | } |
876 | else if (strprefix ("-error ", str)) | |
877 | { | |
6afdd335 | 878 | /* -error DESCRIPTION: Signal an error on the terminal. */ |
0b0d3e0b KL |
879 | str = unquote_argument (str + strlen ("-error ")); |
880 | if (needlf) | |
881 | printf ("\n"); | |
882 | printf ("*ERROR*: %s", str); | |
883 | needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n'; | |
884 | } | |
885 | else if (strprefix ("-suspend ", str)) | |
886 | { | |
6afdd335 | 887 | /* -suspend: Suspend this terminal, i.e., stop the process. */ |
0b0d3e0b | 888 | if (needlf) |
77134727 | 889 | printf ("\n"); |
0b0d3e0b KL |
890 | needlf = 0; |
891 | kill (0, SIGSTOP); | |
4d553a13 KL |
892 | } |
893 | else | |
894 | { | |
6afdd335 | 895 | /* Unknown command. */ |
0b0d3e0b | 896 | if (needlf) |
4d553a13 | 897 | printf ("\n"); |
77134727 | 898 | printf ("*ERROR*: Unknown message: %s", str); |
4d553a13 KL |
899 | needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n'; |
900 | } | |
3cf8c6aa SM |
901 | } |
902 | ||
903 | if (needlf) | |
904 | printf ("\n"); | |
905 | fflush (stdout); | |
0b0d3e0b | 906 | fsync (1); |
23a7488d | 907 | |
65396510 | 908 | return EXIT_SUCCESS; |
46cec291 RS |
909 | } |
910 | ||
30be2360 | 911 | #endif /* HAVE_SOCKETS */ |
27711600 RM |
912 | \f |
913 | #ifndef HAVE_STRERROR | |
914 | char * | |
915 | strerror (errnum) | |
916 | int errnum; | |
917 | { | |
918 | extern char *sys_errlist[]; | |
919 | extern int sys_nerr; | |
920 | ||
921 | if (errnum >= 0 && errnum < sys_nerr) | |
922 | return sys_errlist[errnum]; | |
923 | return (char *) "Unknown error"; | |
924 | } | |
925 | ||
926 | #endif /* ! HAVE_STRERROR */ | |
ab5796a9 MB |
927 | |
928 | /* arch-tag: f39bb9c4-73eb-477e-896d-50832e2ca9a7 | |
929 | (do not change this comment) */ | |
65396510 TTN |
930 | |
931 | /* emacsclient.c ends here */ |