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1 /* Client process that communicates with GNU Emacs acting as server.
2 Copyright (C) 1986, 1987, 1994 Free Software Foundation, Inc.
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
8 the Free Software Foundation; either version 2, or (at your option)
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, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
20
21
22 #define NO_SHORTNAMES
23 #include <../src/config.h>
24 #undef read
25 #undef write
26 #undef open
27 #undef close
28 #undef signal
29
30
31 #if !defined (HAVE_SOCKETS) && !defined (HAVE_SYSVIPC)
32 #include <stdio.h>
33
34 main (argc, argv)
35 int argc;
36 char **argv;
37 {
38 fprintf (stderr, "%s: Sorry, the Emacs server is supported only\n",
39 argv[0]);
40 fprintf (stderr, "on systems with Berkeley sockets or System V IPC.\n");
41 exit (1);
42 }
43
44 #else /* HAVE_SOCKETS or HAVE_SYSVIPC */
45
46 #if defined (HAVE_SOCKETS) && ! defined (NO_SOCKETS_IN_FILE_SYSTEM)
47 /* BSD code is very different from SYSV IPC code */
48
49 #include <sys/types.h>
50 #include <sys/socket.h>
51 #include <sys/un.h>
52 #include <sys/stat.h>
53 #include <stdio.h>
54 #include <errno.h>
55
56 extern char *strerror ();
57 extern int errno;
58
59 int
60 main (argc, argv)
61 int argc;
62 char **argv;
63 {
64 char system_name[32];
65 int s, i;
66 FILE *out;
67 struct sockaddr_un server;
68 char *homedir, *cwd, *str;
69 char string[BUFSIZ];
70
71 char *getenv (), *getwd ();
72 char *getcwd ();
73 int geteuid ();
74
75 if (argc < 2)
76 {
77 fprintf (stderr, "Usage: %s [+linenumber] filename\n", argv[0]);
78 exit (1);
79 }
80
81 /*
82 * Open up an AF_UNIX socket in this person's home directory
83 */
84
85 if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
86 {
87 fprintf (stderr, "%s: ", argv[0]);
88 perror ("socket");
89 exit (1);
90 }
91 server.sun_family = AF_UNIX;
92 #ifndef SERVER_HOME_DIR
93 {
94 struct stat statbfr;
95
96 gethostname (system_name, sizeof (system_name));
97 sprintf (server.sun_path, "/tmp/esrv%d-%s", geteuid (), system_name);
98
99 if (stat (server.sun_path, &statbfr) == -1)
100 {
101 if (errno == ENOENT)
102 fprintf (stderr,
103 "%s: can't find socket; have you started the server?\n",
104 argv[0]);
105 else
106 fprintf (stderr, "%s: can't stat %s: %s\n",
107 argv[0], server.sun_path, strerror (errno));
108 exit (1);
109 }
110 if (statbfr.st_uid != geteuid ())
111 {
112 fprintf (stderr, "%s: Invalid socket owner\n", argv[0]);
113 exit (1);
114 }
115 }
116 #else
117 if ((homedir = getenv ("HOME")) == NULL)
118 {
119 fprintf (stderr, "%s: No home directory\n", argv[0]);
120 exit (1);
121 }
122 strcpy (server.sun_path, homedir);
123 strcat (server.sun_path, "/.emacs-server-");
124 gethostname (system_name, sizeof (system_name));
125 strcat (server.sun_path, system_name);
126 #endif
127
128 if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2)
129 < 0)
130 {
131 fprintf (stderr, "%s: ", argv[0]);
132 perror ("connect");
133 exit (1);
134 }
135 if ((out = fdopen (s, "r+")) == NULL)
136 {
137 fprintf (stderr, "%s: ", argv[0]);
138 perror ("fdopen");
139 exit (1);
140 }
141
142 #ifdef BSD
143 cwd = getwd (string);
144 #else
145 cwd = getcwd (string, sizeof string);
146 #endif
147 if (cwd == 0)
148 {
149 /* getwd puts message in STRING if it fails. */
150 fprintf (stderr, "%s: %s (%s)\n", argv[0], string, strerror (errno));
151 exit (1);
152 }
153
154 for (i = 1; i < argc; i++)
155 {
156 if (*argv[i] == '+')
157 {
158 char *p = argv[i] + 1;
159 while (*p >= '0' && *p <= '9') p++;
160 if (*p != 0)
161 fprintf (out, "%s/", cwd);
162 }
163 else if (*argv[i] != '/')
164 fprintf (out, "%s/", cwd);
165 fprintf (out, "%s ", argv[i]);
166 }
167 fprintf (out, "\n");
168 fflush (out);
169
170 printf ("Waiting for Emacs...");
171 fflush (stdout);
172
173 rewind (out); /* re-read the output */
174 str = fgets (string, BUFSIZ, out);
175 printf ("\n");
176
177 /* Now, wait for an answer and print any messages. */
178
179 while (str = fgets (string, BUFSIZ, out))
180 printf ("%s", str);
181
182 return 0;
183 }
184
185 #else /* This is the SYSV IPC section */
186
187 #include <sys/types.h>
188 #include <sys/ipc.h>
189 #include <sys/msg.h>
190 #include <sys/utsname.h>
191 #include <stdio.h>
192
193 char *getwd (), *getcwd (), *getenv ();
194 struct utsname system_name;
195
196 main (argc, argv)
197 int argc;
198 char **argv;
199 {
200 int s;
201 key_t key;
202 /* Size of text allocated in MSGP. */
203 int size_allocated = BUFSIZ;
204 /* Amount of text used in MSGP. */
205 int used;
206 struct msgbuf *msgp
207 = (struct msgbuf *) malloc (sizeof (struct msgbuf) + size_allocated);
208 struct msqid_ds * msg_st;
209 char *homedir, buf[BUFSIZ];
210 char gwdirb[BUFSIZ];
211 char *cwd;
212 char *temp;
213 char *progname = argv[0];
214
215 if (argc < 2)
216 {
217 fprintf (stderr, "Usage: %s [+linenumber] filename\n", argv[0]);
218 exit (1);
219 }
220
221 /*
222 * Create a message queue using ~/.emacs-server as the path for ftok
223 */
224 if ((homedir = getenv ("HOME")) == NULL)
225 {
226 fprintf (stderr, "%s: No home directory\n", argv[0]);
227 exit (1);
228 }
229 strcpy (buf, homedir);
230 #ifndef HAVE_LONG_FILE_NAMES
231 /* If file names are short, we can't fit the host name. */
232 strcat (buf, "/.emacs-server");
233 #else
234 strcat (buf, "/.emacs-server-");
235 uname (&system_name);
236 strcat (buf, system_name.nodename);
237 #endif
238 creat (buf, 0600);
239 key = ftok (buf, 1); /* unlikely to be anyone else using it */
240 s = msgget (key, 0600 | IPC_CREAT);
241 if (s == -1)
242 {
243 fprintf (stderr, "%s: ", argv[0]);
244 perror ("msgget");
245 exit (1);
246 }
247
248 /* Determine working dir, so we can prefix it to all the arguments. */
249 #ifdef BSD
250 temp = getwd (gwdirb);
251 #else
252 temp = getcwd (gwdirb, sizeof gwdirb);
253 #endif
254
255 cwd = gwdirb;
256 if (temp != 0)
257 {
258 /* On some systems, cwd can look like `@machine/...';
259 ignore everything before the first slash in such a case. */
260 while (*cwd && *cwd != '/')
261 cwd++;
262 strcat (cwd, "/");
263 }
264 else
265 {
266 fprintf (stderr, "%s: %s\n", argv[0], cwd);
267 exit (1);
268 }
269
270 msgp->mtext[0] = 0;
271 used = 0;
272 argc--; argv++;
273 while (argc)
274 {
275 int need_cwd = 0;
276 char *modified_arg = argv[0];
277 if (*modified_arg == '+')
278 {
279 char *p = modified_arg + 1;
280 while (*p >= '0' && *p <= '9') p++;
281 if (*p != 0)
282 need_cwd = 1;
283 }
284 else if (*modified_arg != '/')
285 need_cwd = 1;
286
287 if (need_cwd)
288 used += strlen (cwd);
289 used += strlen (modified_arg) + 1;
290 while (used + 2 > size_allocated)
291 {
292 size_allocated *= 2;
293 msgp = (struct msgbuf *) realloc (msgp,
294 (sizeof (struct msgbuf)
295 + size_allocated));
296 }
297
298 if (need_cwd)
299 strcat (msgp->mtext, cwd);
300
301 strcat (msgp->mtext, modified_arg);
302 strcat (msgp->mtext, " ");
303 argv++; argc--;
304 }
305 strcat (msgp->mtext, "\n");
306 #ifdef HPUX /* HPUX has a bug. */
307 if (strlen (msgp->mtext) >= 512)
308 {
309 fprintf (stderr, "%s: args too long for msgsnd\n", progname);
310 exit (1);
311 }
312 #endif
313 msgp->mtype = 1;
314 if (msgsnd (s, msgp, strlen (msgp->mtext)+1, 0) < 0)
315 {
316 fprintf (stderr, "%s: ", progname);
317 perror ("msgsnd");
318 exit (1);
319 }
320 /*
321 * Now, wait for an answer
322 */
323 printf ("Waiting for Emacs...");
324 fflush (stdout);
325
326 msgrcv (s, msgp, BUFSIZ, getpid (), 0); /* wait for anything back */
327 strcpy (buf, msgp->mtext);
328
329 printf ("\n");
330 if (*buf)
331 printf ("%s\n", buf);
332 exit (0);
333 }
334
335 #endif /* HAVE_SYSVIPC */
336
337 #endif /* HAVE_SOCKETS or HAVE_SYSVIPC */
338 \f
339 #ifndef HAVE_STRERROR
340 char *
341 strerror (errnum)
342 int errnum;
343 {
344 extern char *sys_errlist[];
345 extern int sys_nerr;
346
347 if (errnum >= 0 && errnum < sys_nerr)
348 return sys_errlist[errnum];
349 return (char *) "Unknown error";
350 }
351
352 #endif /* ! HAVE_STRERROR */