Commit | Line | Data |
---|---|---|
d953f306 | 1 | /* Communication subprocess for GNU Emacs acting as server. |
86af296b | 2 | Copyright (C) 1986, 1987, 1992, 1994 Free Software Foundation, Inc. |
d953f306 RS |
3 | |
4 | This file is part of GNU Emacs. | |
5 | ||
6 | GNU Emacs is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
d4327fec | 8 | the Free Software Foundation; either version 2, or (at your option) |
d953f306 RS |
9 | any later version. |
10 | ||
11 | GNU Emacs is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Emacs; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | ||
21 | /* The GNU Emacs edit server process is run as a subprocess of Emacs | |
22 | under control of the file lisp/server.el. | |
23 | This program accepts communication from client (program emacsclient.c) | |
24 | and passes their commands (consisting of keyboard characters) | |
25 | up to the Emacs which then executes them. */ | |
26 | ||
27 | #define NO_SHORTNAMES | |
18160b98 | 28 | #include <../src/config.h> |
d953f306 RS |
29 | #undef read |
30 | #undef write | |
31 | #undef open | |
32 | #undef close | |
5ed8e09c | 33 | #undef signal |
d953f306 | 34 | |
021eac48 | 35 | #if !defined (HAVE_SOCKETS) && !defined (HAVE_SYSVIPC) |
d953f306 RS |
36 | #include <stdio.h> |
37 | ||
38 | main () | |
39 | { | |
40 | fprintf (stderr, "Sorry, the Emacs server is supported only on systems\n"); | |
41 | fprintf (stderr, "with Berkeley sockets or System V IPC.\n"); | |
42 | exit (1); | |
43 | } | |
44 | ||
45 | #else /* HAVE_SOCKETS or HAVE_SYSVIPC */ | |
46 | ||
1e523e3d | 47 | #if defined (HAVE_SOCKETS) && ! defined (NO_SOCKETS_IN_FILE_SYSTEM) |
d953f306 RS |
48 | /* BSD code is very different from SYSV IPC code */ |
49 | ||
d953f306 | 50 | #include <sys/types.h> |
908d6b87 | 51 | #include <sys/file.h> |
d953f306 RS |
52 | #include <sys/socket.h> |
53 | #include <sys/signal.h> | |
54 | #include <sys/un.h> | |
55 | #include <stdio.h> | |
56 | #include <errno.h> | |
cbf5f47c | 57 | #include <sys/stat.h> |
d953f306 RS |
58 | |
59 | extern int errno; | |
60 | ||
b38bab94 KH |
61 | /* Copied from src/process.c */ |
62 | #ifdef FD_SET | |
63 | /* We could get this from param.h, but better not to depend on finding that. | |
64 | And better not to risk that it might define other symbols used in this | |
65 | file. */ | |
66 | #ifdef FD_SETSIZE | |
67 | #define MAXDESC FD_SETSIZE | |
68 | #else | |
69 | #define MAXDESC 64 | |
70 | #endif | |
71 | #define SELECT_TYPE fd_set | |
72 | #else /* no FD_SET */ | |
73 | #define MAXDESC 32 | |
74 | #define SELECT_TYPE int | |
75 | ||
76 | /* Define the macros to access a single-int bitmap of descriptors. */ | |
77 | #define FD_SET(n, p) (*(p) |= (1 << (n))) | |
78 | #define FD_CLR(n, p) (*(p) &= ~(1 << (n))) | |
79 | #define FD_ISSET(n, p) (*(p) & (1 << (n))) | |
80 | #define FD_ZERO(p) (*(p) = 0) | |
81 | #endif /* no FD_SET */ | |
82 | ||
d953f306 RS |
83 | main () |
84 | { | |
1464f5d5 | 85 | char system_name[32]; |
d953f306 RS |
86 | int s, infd, fromlen; |
87 | struct sockaddr_un server, fromunix; | |
88 | char *homedir; | |
89 | char *str, string[BUFSIZ], code[BUFSIZ]; | |
90 | FILE *infile; | |
91 | FILE **openfiles; | |
92 | int openfiles_size; | |
cbf5f47c | 93 | struct stat statbuf; |
d953f306 | 94 | |
f662f9b0 | 95 | #ifndef convex |
d953f306 | 96 | char *getenv (); |
f662f9b0 | 97 | #endif |
d953f306 RS |
98 | |
99 | openfiles_size = 20; | |
100 | openfiles = (FILE **) malloc (openfiles_size * sizeof (FILE *)); | |
101 | if (openfiles == 0) | |
102 | abort (); | |
103 | ||
104 | /* | |
105 | * Open up an AF_UNIX socket in this person's home directory | |
106 | */ | |
107 | ||
108 | if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0) | |
109 | { | |
ccd318fb | 110 | perror_1 ("socket"); |
d953f306 RS |
111 | exit (1); |
112 | } | |
113 | server.sun_family = AF_UNIX; | |
1464f5d5 JB |
114 | #ifndef SERVER_HOME_DIR |
115 | gethostname (system_name, sizeof (system_name)); | |
116 | sprintf (server.sun_path, "/tmp/esrv%d-%s", geteuid (), system_name); | |
117 | ||
118 | if (unlink (server.sun_path) == -1 && errno != ENOENT) | |
119 | { | |
ccd318fb | 120 | perror_1 ("unlink"); |
1464f5d5 JB |
121 | exit (1); |
122 | } | |
123 | #else | |
124 | if ((homedir = getenv ("HOME")) == NULL) | |
ccd318fb RS |
125 | fatal_error ("No home directory\n"); |
126 | ||
d953f306 | 127 | strcpy (server.sun_path, homedir); |
021eac48 RS |
128 | strcat (server.sun_path, "/.emacs-server-"); |
129 | gethostname (system_name, sizeof (system_name)); | |
130 | strcat (server.sun_path, system_name); | |
d953f306 RS |
131 | /* Delete anyone else's old server. */ |
132 | unlink (server.sun_path); | |
1464f5d5 JB |
133 | #endif |
134 | ||
2fdfe079 | 135 | if (bind (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2) < 0) |
d953f306 | 136 | { |
ccd318fb | 137 | perror_1 ("bind"); |
d953f306 RS |
138 | exit (1); |
139 | } | |
140 | /* Only this user can send commands to this Emacs. */ | |
cbf5f47c KH |
141 | if (stat (server.sun_path, &statbuf) < 0) |
142 | { | |
143 | perror_1 ("bind"); | |
144 | exit (1); | |
145 | } | |
146 | ||
147 | chmod (server.sun_path, statbuf.st_mode & 0600); | |
d953f306 RS |
148 | /* |
149 | * Now, just wait for everything to come in.. | |
150 | */ | |
151 | if (listen (s, 5) < 0) | |
152 | { | |
ccd318fb | 153 | perror_1 ("listen"); |
d953f306 RS |
154 | exit (1); |
155 | } | |
156 | ||
157 | /* Disable sigpipes in case luser kills client... */ | |
158 | signal (SIGPIPE, SIG_IGN); | |
159 | for (;;) | |
160 | { | |
b38bab94 | 161 | SELECT_TYPE rmask; |
86af296b RM |
162 | FD_ZERO (&rmask); |
163 | FD_SET (0, &rmask); | |
164 | FD_SET (s, &rmask); | |
b38bab94 | 165 | if (select (s + 1, &rmask, 0, 0, 0) < 0) |
ccd318fb | 166 | perror_1 ("select"); |
86af296b | 167 | if (FD_ISSET (s, &rmask)) /* client sends list of filenames */ |
d953f306 RS |
168 | { |
169 | fromlen = sizeof (fromunix); | |
170 | fromunix.sun_family = AF_UNIX; | |
b38bab94 | 171 | infd = accept (s, (struct sockaddr *) &fromunix, &fromlen); |
d953f306 RS |
172 | if (infd < 0) |
173 | { | |
174 | if (errno == EMFILE || errno == ENFILE) | |
ccd318fb | 175 | fprintf (stderr, "Error: too many clients.\n"); |
d953f306 | 176 | else |
ccd318fb | 177 | perror_1 ("accept"); |
d953f306 RS |
178 | continue; |
179 | } | |
180 | ||
181 | if (infd >= openfiles_size) | |
182 | { | |
183 | openfiles_size *= 2; | |
184 | openfiles = (FILE **) realloc (openfiles, | |
185 | openfiles_size * sizeof (FILE *)); | |
186 | if (openfiles == 0) | |
187 | abort (); | |
188 | } | |
189 | ||
190 | infile = fdopen (infd, "r+"); /* open stream */ | |
191 | if (infile == NULL) | |
192 | { | |
ccd318fb | 193 | fprintf (stderr, "Error: too many clients.\n"); |
d953f306 RS |
194 | write (infd, "Too many clients.\n", 18); |
195 | close (infd); /* Prevent descriptor leak.. */ | |
196 | continue; | |
197 | } | |
198 | str = fgets (string, BUFSIZ, infile); | |
199 | if (str == NULL) | |
200 | { | |
ccd318fb | 201 | perror_1 ("fgets"); |
d953f306 RS |
202 | close (infd); /* Prevent descriptor leak.. */ |
203 | continue; | |
204 | } | |
205 | openfiles[infd] = infile; | |
206 | printf ("Client: %d %s", infd, string); | |
207 | /* If what we read did not end in a newline, | |
208 | it means there is more. Keep reading from the socket | |
209 | and outputting to Emacs, until we get the newline. */ | |
210 | while (string[strlen (string) - 1] != '\n') | |
211 | { | |
212 | if (fgets (string, BUFSIZ, infile) == 0) | |
213 | break; | |
214 | printf ("%s", string); | |
215 | } | |
216 | fflush (stdout); | |
217 | fflush (infile); | |
218 | continue; | |
219 | } | |
86af296b | 220 | else if (FD_ISSET (0, &rmask)) /* emacs sends codeword, fd, and string message */ |
d953f306 RS |
221 | { |
222 | /* Read command codeword and fd */ | |
223 | clearerr (stdin); | |
224 | scanf ("%s %d%*c", code, &infd); | |
225 | if (ferror (stdin) || feof (stdin)) | |
ccd318fb | 226 | fatal_error ("server: error reading from standard input\n"); |
d953f306 RS |
227 | |
228 | /* Transfer text from Emacs to the client, up to a newline. */ | |
229 | infile = openfiles[infd]; | |
230 | while (1) | |
231 | { | |
232 | if (fgets (string, BUFSIZ, stdin) == 0) | |
233 | break; | |
234 | fprintf (infile, "%s", string); | |
235 | if (string[strlen (string) - 1] == '\n') | |
236 | break; | |
237 | } | |
238 | fflush (infile); | |
239 | ||
240 | /* If command is close, close connection to client. */ | |
241 | if (strncmp (code, "Close:", 6) == 0) | |
242 | if (infd > 2) | |
243 | { | |
244 | fclose (infile); | |
245 | close (infd); | |
246 | } | |
247 | continue; | |
248 | } | |
249 | } | |
250 | } | |
251 | ||
252 | #else /* This is the SYSV IPC section */ | |
253 | ||
254 | #include <sys/types.h> | |
255 | #include <sys/signal.h> | |
256 | #include <sys/ipc.h> | |
257 | #include <sys/msg.h> | |
258 | #include <setjmp.h> | |
b8a0f2d8 | 259 | #include <errno.h> |
021eac48 RS |
260 | #include <sys/utsname.h> |
261 | ||
262 | struct utsname system_name; | |
b8a0f2d8 RS |
263 | |
264 | #ifndef errno | |
265 | extern int errno; | |
266 | #endif | |
d953f306 RS |
267 | |
268 | jmp_buf msgenv; | |
269 | ||
d4327fec | 270 | SIGTYPE |
d953f306 RS |
271 | msgcatch () |
272 | { | |
273 | longjmp (msgenv, 1); | |
274 | } | |
275 | ||
276 | ||
277 | /* "THIS has to be fixed. Remember, stderr may not exist...-rlk." | |
278 | Incorrect. This program runs as an inferior of Emacs. | |
279 | Its stderr always exists--rms. */ | |
280 | #include <stdio.h> | |
281 | ||
282 | main () | |
283 | { | |
2f317998 | 284 | int s, infd, fromlen, ioproc; |
d953f306 RS |
285 | key_t key; |
286 | struct msgbuf * msgp = | |
287 | (struct msgbuf *) malloc (sizeof *msgp + BUFSIZ); | |
288 | struct msqid_ds msg_st; | |
289 | int p; | |
290 | char *homedir, *getenv (); | |
291 | char string[BUFSIZ]; | |
292 | FILE *infile; | |
293 | ||
294 | /* | |
021eac48 | 295 | * Create a message queue using ~/.emacs-server as the path for ftok |
d953f306 RS |
296 | */ |
297 | if ((homedir = getenv ("HOME")) == NULL) | |
ccd318fb RS |
298 | fatal_error ("No home directory\n"); |
299 | ||
d953f306 | 300 | strcpy (string, homedir); |
021eac48 RS |
301 | #ifndef HAVE_LONG_FILE_NAMES |
302 | /* If file names are short, we can't fit the host name. */ | |
303 | strcat (string, "/.emacs-server"); | |
304 | #else | |
305 | strcat (string, "/.emacs-server-"); | |
306 | uname (&system_name); | |
307 | strcat (string, system_name.nodename); | |
308 | #endif | |
d953f306 RS |
309 | creat (string, 0600); |
310 | key = ftok (string, 1); /* unlikely to be anyone else using it */ | |
311 | s = msgget (key, 0600 | IPC_CREAT); | |
312 | if (s == -1) | |
313 | { | |
ccd318fb | 314 | perror_1 ("msgget"); |
d953f306 RS |
315 | exit (1); |
316 | } | |
317 | ||
318 | /* Fork so we can close connection even if parent dies */ | |
319 | p = fork (); | |
320 | if (setjmp (msgenv)) | |
321 | { | |
322 | msgctl (s, IPC_RMID, 0); | |
b8a0f2d8 RS |
323 | if (p > 0) |
324 | kill (p, SIGKILL); | |
d953f306 RS |
325 | exit (0); |
326 | } | |
327 | signal (SIGTERM, msgcatch); | |
328 | signal (SIGINT, msgcatch); | |
b8a0f2d8 | 329 | signal (SIGHUP, msgcatch); |
9e3891de | 330 | if (p > 0) |
d953f306 | 331 | { |
9e3891de RS |
332 | /* This is executed in the original process that did the fork above. */ |
333 | /* Get pid of Emacs itself. */ | |
d953f306 RS |
334 | p = getppid (); |
335 | setpgrp (); /* Gnu kills process group on exit */ | |
336 | while (1) | |
337 | { | |
9e3891de | 338 | /* Is Emacs still alive? */ |
d953f306 RS |
339 | if (kill (p, 0) < 0) |
340 | { | |
341 | msgctl (s, IPC_RMID, 0); | |
342 | exit (0); | |
343 | } | |
344 | sleep (10); | |
345 | } | |
346 | } | |
347 | ||
2f317998 RS |
348 | /* This is executed in the child made by forking above. |
349 | Call it c1. Make another process, ioproc. */ | |
350 | ||
351 | ioproc = fork (); | |
352 | if (ioproc == 0) | |
353 | { | |
354 | /* In process ioproc, wait for text from Emacs, | |
355 | and send it to the process c1. | |
356 | This way, c1 only has to wait for one source of input. */ | |
357 | while (fgets (msgp->mtext, BUFSIZ, stdin)) | |
358 | { | |
359 | msgp->mtype = 1; | |
360 | msgsnd (s, msgp, strlen (msgp->mtext) + 1, 0); | |
361 | } | |
362 | exit (1); | |
363 | } | |
364 | ||
365 | /* In the process c1, | |
366 | listen for messages from clients and pass them to Emacs. */ | |
d953f306 RS |
367 | while (1) |
368 | { | |
369 | if ((fromlen = msgrcv (s, msgp, BUFSIZ - 1, 1, 0)) < 0) | |
370 | { | |
b8a0f2d8 RS |
371 | #ifdef EINTR |
372 | if (errno == EINTR) | |
373 | continue; | |
374 | #endif | |
ccd318fb | 375 | perror_1 ("msgrcv"); |
1464f5d5 | 376 | exit (1); |
d953f306 RS |
377 | } |
378 | else | |
379 | { | |
380 | msgctl (s, IPC_STAT, &msg_st); | |
2f317998 RS |
381 | |
382 | /* Distinguish whether the message came from a client, or from | |
383 | ioproc. */ | |
384 | if (msg_st.msg_lspid == ioproc) | |
385 | { | |
386 | char code[BUFSIZ]; | |
387 | int inproc; | |
388 | ||
389 | /* Message from ioproc: tell a client we are done. */ | |
390 | msgp->mtext[strlen (msgp->mtext)-1] = 0; | |
391 | sscanf (msgp->mtext, "%s %d", code, &inproc); | |
392 | msgp->mtype = inproc; | |
393 | msgsnd (s, msgp, strlen (msgp->mtext) + 1, 0); | |
394 | continue; | |
395 | } | |
396 | ||
397 | /* This is a request from a client: copy to stdout | |
398 | so that Emacs will get it. Include msg_lspid | |
399 | so server.el can tell us where to send the reply. */ | |
d953f306 RS |
400 | strncpy (string, msgp->mtext, fromlen); |
401 | string[fromlen] = 0; /* make sure */ | |
402 | /* Newline is part of string.. */ | |
2f317998 | 403 | printf ("Client: %d %s", msg_st.msg_lspid, string); |
d953f306 | 404 | fflush (stdout); |
d953f306 RS |
405 | } |
406 | } | |
407 | } | |
408 | ||
409 | #endif /* HAVE_SYSVIPC */ | |
410 | ||
411 | #endif /* HAVE_SOCKETS or HAVE_SYSVIPC */ | |
ccd318fb RS |
412 | \f |
413 | /* This is like perror but puts `Error: ' at the beginning. */ | |
414 | ||
415 | perror_1 (string) | |
416 | char *string; | |
417 | { | |
418 | char *copy = (char *) malloc (strlen (string) + 8); | |
419 | if (copy == 0) | |
420 | fatal_error ("Virtual memory exhausted"); | |
421 | ||
422 | strcpy (copy, "Error: "); | |
423 | strcat (copy, string); | |
424 | perror (copy); | |
425 | } | |
426 | ||
427 | fatal_error (string) | |
428 | char *string; | |
429 | { | |
430 | fprintf (stderr, "%s", "Error: "); | |
431 | fprintf (stderr, string); | |
432 | exit (1); | |
433 | } |