1 /* Client process that communicates with GNU Emacs acting as server.
2 Copyright (C) 1986, 1987, 1994, 1999, 2000, 2001, 2003
3 Free Software Foundation, Inc.
5 This file is part of GNU Emacs.
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
9 the Free Software Foundation; either version 2, or (at your option)
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.
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
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
44 char *getenv (), *getwd ();
47 /* This is defined with -D from the compilation command,
48 which extracts it from ../lisp/version.el. */
51 #define VERSION "unspecified"
54 /* Name used to invoke this program. */
57 /* Nonzero means don't wait for a response from Emacs. --no-wait. */
60 /* Nonzero means args are expressions to be evaluated. --eval. */
63 /* The display on which Emacs should work. --display. */
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
;
70 /* If non-NULL, the filename of the UNIX socket. */
71 char *socket_name
= NULL
;
73 void print_help_and_exit ();
75 struct option longopts
[] =
77 { "no-wait", no_argument
, NULL
, 'n' },
78 { "eval", no_argument
, NULL
, 'e' },
79 { "help", no_argument
, NULL
, 'H' },
80 { "version", no_argument
, NULL
, 'V' },
81 { "alternate-editor", required_argument
, NULL
, 'a' },
82 { "socket-name", required_argument
, NULL
, 's' },
83 { "display", required_argument
, NULL
, 'd' },
87 /* Decode the options from argv and argc.
88 The global variable `optind' will say how many arguments we used up. */
91 decode_options (argc
, argv
)
97 int opt
= getopt_long (argc
, argv
,
98 "VHnea:s:d:", longopts
, 0);
103 alternate_editor
= getenv ("ALTERNATE_EDITOR");
108 /* If getopt returns 0, then it has already processed a
109 long-named option. We should do nothing. */
113 alternate_editor
= optarg
;
117 socket_name
= optarg
;
133 printf ("emacsclient %s\n", VERSION
);
138 print_help_and_exit ();
142 fprintf (stderr
, "Try `%s --help' for more information\n", progname
);
150 print_help_and_exit ()
153 "Usage: %s [OPTIONS] FILE...\n\
154 Tell the Emacs server to visit the specified files.\n\
155 Every FILE can be either just a FILENAME or [+LINE[:COLUMN]] FILENAME.\n\
157 The following OPTIONS are accepted:\n\
158 -V, --version Just print a version info and return\n\
159 -H, --help Print this usage information message\n\
160 -n, --no-wait Don't wait for the server to return\n\
161 -e, --eval Evaluate the FILE arguments as ELisp expressions\n\
162 -d, --display=DISPLAY Visit the file in the given display\n\
163 -s, --socket-name=FILENAME\n\
164 Set the filename of the UNIX socket for communication\n\
165 -a, --alternate-editor=EDITOR\n\
166 Editor to fallback to if the server is not running\n\
168 Report bugs to bug-gnu-emacs@gnu.org.\n", progname
);
172 /* In NAME, insert a & before each &, each space, each newline, and
173 any initial -. Change spaces to underscores, too, so that the
174 return value never contains a space. */
177 quote_file_name (name
, stream
)
181 char *copy
= (char *) malloc (strlen (name
) * 2 + 1);
202 if (*p
== '&' || (*p
== '-' && p
== name
))
209 fprintf (stream
, copy
);
214 /* Like malloc but get fatal error if memory is exhausted. */
220 long *result
= (long *) malloc (size
);
230 Try to run a different command, or --if no alternate editor is
231 defined-- exit with an errorcode.
238 if (alternate_editor
)
241 execvp (alternate_editor
, argv
+ i
);
252 #if !defined (HAVE_SOCKETS) || defined (NO_SOCKETS_IN_FILE_SYSTEM)
259 fprintf (stderr
, "%s: Sorry, the Emacs server is supported only\n",
261 fprintf (stderr
, "on systems with Berkeley sockets.\n");
266 #else /* HAVE_SOCKETS */
268 #include <sys/types.h>
269 #include <sys/socket.h>
271 #include <sys/stat.h>
274 extern char *strerror ();
277 /* Three possibilities:
278 2 - can't be `stat'ed (sets errno)
279 1 - isn't owned by us
280 0 - success: none of the above */
283 socket_status (socket_name
)
288 if (stat (socket_name
, &statbfr
) == -1)
291 if (statbfr
.st_uid
!= geteuid ())
303 int system_name_length
;
304 int s
, i
, needlf
= 0;
306 struct sockaddr_un server
;
312 /* Process options. */
313 decode_options (argc
, argv
);
315 if ((argc
- optind
< 1) && !eval
)
317 fprintf (stderr
, "%s: file name or argument required\n", progname
);
318 fprintf (stderr
, "Try `%s --help' for more information\n", progname
);
323 * Open up an AF_UNIX socket in this person's home directory
326 if ((s
= socket (AF_UNIX
, SOCK_STREAM
, 0)) < 0)
328 fprintf (stderr
, "%s: ", argv
[0]);
333 server
.sun_family
= AF_UNIX
;
337 system_name_length
= 32;
341 system_name
= (char *) xmalloc (system_name_length
+ 1);
343 /* system_name must be null-terminated string. */
344 system_name
[system_name_length
] = '\0';
346 if (gethostname (system_name
, system_name_length
) == 0)
350 system_name_length
*= 2;
353 /* We always use the non-dotted host name, for simplicity. */
354 dot
= index (system_name
, '.');
364 socket_name
= alloca (system_name_length
+ 100);
365 sprintf (socket_name
, "/tmp/emacs%d-%s/server",
366 (int) geteuid (), system_name
);
369 if (strlen (socket_name
) < sizeof (server
.sun_path
))
370 strcpy (server
.sun_path
, socket_name
);
372 fprintf (stderr
, "%s: socket-name %s too long",
373 argv
[0], socket_name
);
375 /* See if the socket exists, and if it's owned by us. */
376 sock_status
= socket_status (server
.sun_path
);
379 /* Failing that, see if LOGNAME or USER exist and differ from
380 our euid. If so, look for a socket based on the UID
381 associated with the name. This is reminiscent of the logic
382 that init_editfns uses to set the global Vuser_full_name. */
384 char *user_name
= (char *) getenv ("LOGNAME");
386 user_name
= (char *) getenv ("USER");
390 struct passwd
*pw
= getpwnam (user_name
);
391 if (pw
&& (pw
->pw_uid
!= geteuid ()))
393 /* We're running under su, apparently. */
394 sprintf (server
.sun_path
, "/tmp/emacs%d-%s/server",
395 (int) pw
->pw_uid
, system_name
);
396 sock_status
= socket_status (server
.sun_path
);
404 /* There's a socket, but it isn't owned by us. This is OK if
408 fprintf (stderr
, "%s: Invalid socket owner\n", argv
[0]);
417 "%s: can't find socket; have you started the server?\n\
418 To start the server in Emacs, type \"M-x server-start\".\n",
421 fprintf (stderr
, "%s: can't stat %s: %s\n",
422 argv
[0], server
.sun_path
, strerror (errno
));
428 if (connect (s
, (struct sockaddr
*) &server
, strlen (server
.sun_path
) + 2)
431 fprintf (stderr
, "%s: ", argv
[0]);
436 /* We use the stream OUT to send our command to the server. */
437 if ((out
= fdopen (s
, "r+")) == NULL
)
439 fprintf (stderr
, "%s: ", argv
[0]);
444 /* We use the stream IN to read the response.
445 We used to use just one stream for both output and input
446 on the socket, but reversing direction works nonportably:
447 on some systems, the output appears as the first input;
448 on other systems it does not. */
449 if ((in
= fdopen (s
, "r+")) == NULL
)
451 fprintf (stderr
, "%s: ", argv
[0]);
457 cwd
= getcwd (string
, sizeof string
);
459 cwd
= getwd (string
);
463 /* getwd puts message in STRING if it fails. */
466 fprintf (stderr
, "%s: %s (%s)\n", argv
[0],
467 "Cannot get current working directory", strerror (errno
));
469 fprintf (stderr
, "%s: %s (%s)\n", argv
[0], string
, strerror (errno
));
475 fprintf (out
, "-nowait ");
478 fprintf (out
, "-eval ");
482 fprintf (out
, "-display ");
483 quote_file_name (display
, out
);
487 if ((argc
- optind
> 0))
489 for (i
= optind
; i
< argc
; i
++)
492 ; /* Don't prepend any cwd or anything like that. */
493 else if (*argv
[i
] == '+')
495 char *p
= argv
[i
] + 1;
496 while (isdigit ((unsigned char) *p
) || *p
== ':') p
++;
499 quote_file_name (cwd
, out
);
503 else if (*argv
[i
] != '/')
505 quote_file_name (cwd
, out
);
509 quote_file_name (argv
[i
], out
);
515 while ((str
= fgets (string
, BUFSIZ
, stdin
)))
517 quote_file_name (str
, out
);
525 /* Maybe wait for an answer. */
531 printf ("Waiting for Emacs...");
536 /* Now, wait for an answer and print any messages. */
537 while ((str
= fgets (string
, BUFSIZ
, in
)))
542 needlf
= str
[0] == '\0' ? needlf
: str
[strlen (str
) - 1] != '\n';
552 #endif /* HAVE_SOCKETS */
554 #ifndef HAVE_STRERROR
559 extern char *sys_errlist
[];
562 if (errnum
>= 0 && errnum
< sys_nerr
)
563 return sys_errlist
[errnum
];
564 return (char *) "Unknown error";
567 #endif /* ! HAVE_STRERROR */
569 /* arch-tag: f39bb9c4-73eb-477e-896d-50832e2ca9a7
570 (do not change this comment) */