1 /* Client process that communicates with GNU Emacs acting as server.
2 Copyright (C) 1986, 1987, 1994, 1999, 2000, 2001, 2002, 2003, 2004,
3 2005, 2006, 2007, 2008 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 3, 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., 51 Franklin Street, Fifth Floor,
20 Boston, MA 02110-1301, USA. */
31 /* config.h defines these, which disables sockets altogether! */
38 # include <commctrl.h>
40 # define NO_SOCKETS_IN_FILE_SYSTEM
42 # define HSOCKET SOCKET
43 # define CLOSE_SOCKET closesocket
44 # define INITIALIZE() (initialize_sockets ())
46 #else /* !WINDOWSNT */
48 # include <sys/types.h>
50 # ifdef HAVE_INET_SOCKETS
51 # include <netinet/in.h>
54 # define INVALID_SOCKET -1
56 # define CLOSE_SOCKET close
59 #endif /* !WINDOWSNT */
76 #else /* not WINDOWSNT */
78 #endif /* not WINDOWSNT */
86 char *getenv (), *getwd ();
91 #define egetenv(VAR) w32_getenv(VAR)
93 #define egetenv(VAR) getenv(VAR)
97 #define VERSION "unspecified"
102 #define EXIT_SUCCESS 0
106 #define EXIT_FAILURE 1
121 /* Name used to invoke this program. */
124 /* The second argument to main. */
127 /* Nonzero means don't wait for a response from Emacs. --no-wait. */
130 /* Nonzero means args are expressions to be evaluated. --eval. */
133 /* Nonzero means don't open a new frame. Inverse of --create-frame. */
134 int current_frame
= 1;
136 /* Nonzero means open a new graphical frame. */
137 int window_system
= 0;
139 /* The display on which Emacs should work. --display. */
140 char *display
= NULL
;
142 /* Nonzero means open a new Emacs frame on the current terminal. */
145 /* If non-NULL, the name of an editor to fallback to if the server
146 is not running. --alternate-editor. */
147 const char *alternate_editor
= NULL
;
149 /* If non-NULL, the filename of the UNIX socket. */
150 char *socket_name
= NULL
;
152 /* If non-NULL, the filename of the authentication file. */
153 char *server_file
= NULL
;
155 /* PID of the Emacs server process. */
158 void print_help_and_exit () NO_RETURN
;
160 struct option longopts
[] =
162 { "no-wait", no_argument
, NULL
, 'n' },
163 { "eval", no_argument
, NULL
, 'e' },
164 { "help", no_argument
, NULL
, 'H' },
165 { "version", no_argument
, NULL
, 'V' },
166 { "tty", no_argument
, NULL
, 't' },
167 { "create-frame", no_argument
, NULL
, 'c' },
168 { "alternate-editor", required_argument
, NULL
, 'a' },
169 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
170 { "socket-name", required_argument
, NULL
, 's' },
172 { "server-file", required_argument
, NULL
, 'f' },
174 { "display", required_argument
, NULL
, 'd' },
180 /* Like malloc but get fatal error if memory is exhausted. */
186 long *result
= (long *) malloc (size
);
195 /* Like strdup but get a fatal error if memory is exhausted. */
198 xstrdup (const char *s
)
200 char *result
= strdup (s
);
210 #if !defined (HAVE_GET_CURRENT_DIR_NAME) || defined (BROKEN_GET_CURRENT_DIR_NAME)
213 #ifndef DIRECTORY_SEP
214 #define DIRECTORY_SEP '/'
216 #ifndef IS_DIRECTORY_SEP
217 #define IS_DIRECTORY_SEP(_c_) ((_c_) == DIRECTORY_SEP)
219 #ifndef IS_DEVICE_SEP
221 #define IS_DEVICE_SEP(_c_) 0
223 #define IS_DEVICE_SEP(_c_) ((_c_) == DEVICE_SEP)
227 #define IS_ANY_SEP(_c_) (IS_DIRECTORY_SEP (_c_))
231 /* Return the current working directory. Returns NULL on errors.
232 Any other returned value must be freed with free. This is used
233 only when get_current_dir_name is not defined on the system. */
235 get_current_dir_name ()
239 struct stat dotstat
, pwdstat
;
240 /* If PWD is accurate, use it instead of calling getwd. PWD is
241 sometimes a nicer name, and using it may avoid a fatal error if a
242 parent directory is searchable but not readable. */
243 if ((pwd
= egetenv ("PWD")) != 0
244 && (IS_DIRECTORY_SEP (*pwd
) || (*pwd
&& IS_DEVICE_SEP (pwd
[1])))
245 && stat (pwd
, &pwdstat
) == 0
246 && stat (".", &dotstat
) == 0
247 && dotstat
.st_ino
== pwdstat
.st_ino
248 && dotstat
.st_dev
== pwdstat
.st_dev
250 && strlen (pwd
) < MAXPATHLEN
254 buf
= (char *) xmalloc (strlen (pwd
) + 1);
262 size_t buf_size
= 1024;
263 buf
= (char *) xmalloc (buf_size
);
268 if (getcwd (buf
, buf_size
) == buf
)
272 int tmp_errno
= errno
;
278 buf
= (char *) realloc (buf
, buf_size
);
286 /* We need MAXPATHLEN here. */
287 buf
= (char *) xmalloc (MAXPATHLEN
+ 1);
290 if (getwd (buf
) == NULL
)
292 int tmp_errno
= errno
;
305 #define REG_ROOT "SOFTWARE\\GNU\\Emacs"
307 /* Retrieve an environment variable from the Emacs subkeys of the registry.
308 Return NULL if the variable was not found, or it was empty.
309 This code is based on w32_get_resource (w32.c). */
311 w32_get_resource (predefined
, key
, type
)
316 HKEY hrootkey
= NULL
;
320 if (RegOpenKeyEx (predefined
, REG_ROOT
, 0, KEY_READ
, &hrootkey
) == ERROR_SUCCESS
)
322 if (RegQueryValueEx (hrootkey
, key
, NULL
, NULL
, NULL
, &cbData
) == ERROR_SUCCESS
)
324 result
= (char *) xmalloc (cbData
);
326 if ((RegQueryValueEx (hrootkey
, key
, NULL
, type
, result
, &cbData
) != ERROR_SUCCESS
) ||
334 RegCloseKey (hrootkey
);
341 getenv wrapper for Windows
343 This is needed to duplicate Emacs's behavior, which is to look for enviroment
344 variables in the registry if they don't appear in the environment.
353 if (value
= getenv (envvar
))
354 /* Found in the environment. */
357 if (! (value
= w32_get_resource (HKEY_CURRENT_USER
, envvar
, &dwType
)) &&
358 ! (value
= w32_get_resource (HKEY_LOCAL_MACHINE
, envvar
, &dwType
)))
359 /* Not found in the registry. */
362 if (dwType
== REG_SZ
)
363 /* Registry; no need to expand. */
366 if (dwType
== REG_EXPAND_SZ
)
370 if (size
= ExpandEnvironmentStrings (value
, NULL
, 0))
372 char *buffer
= (char *) xmalloc (size
);
373 if (ExpandEnvironmentStrings (value
, buffer
, size
))
375 /* Found and expanded. */
380 /* Error expanding. */
385 /* Not the right type, or not correctly expanded. */
393 static int window_app
= -1;
394 char szTitle
[MAX_PATH
];
398 /* Checking for STDOUT does not work; it's a valid handle also in
399 nonconsole apps. Testing for the console title seems to work. */
400 window_app
= (GetConsoleTitleA (szTitle
, MAX_PATH
) == 0);
402 InitCommonControls();
409 execvp wrapper for Windows. Quotes arguments with embedded spaces.
411 This is necessary due to the broken implementation of exec* routines in
412 the Microsoft libraries: they concatenate the arguments together without
413 quoting special characters, and pass the result to CreateProcess, with
414 predictably bad results. By contrast, Posix execvp passes the arguments
415 directly into the argv array of the child process.
418 w32_execvp (path
, argv
)
424 /* Required to allow a .BAT script as alternate editor. */
425 argv
[0] = (char *) alternate_editor
;
427 for (i
= 0; argv
[i
]; i
++)
428 if (strchr (argv
[i
], ' '))
430 char *quoted
= alloca (strlen (argv
[i
]) + 3);
431 sprintf (quoted
, "\"%s\"", argv
[i
]);
435 return execvp (path
, argv
);
439 #define execvp w32_execvp
441 #endif /* WINDOWSNT */
443 /* Display a normal or error message.
444 On Windows, use a message box if compiled as a Windows app. */
446 message (int is_error
, char *message
, ...)
451 va_start (args
, message
);
452 vsprintf (msg
, message
, args
);
456 if (w32_window_app ())
459 MessageBox (NULL
, msg
, "Emacsclient ERROR", MB_ICONERROR
);
461 MessageBox (NULL
, msg
, "Emacsclient", MB_ICONINFORMATION
);
466 FILE *f
= is_error
? stderr
: stdout
;
473 /* Decode the options from argv and argc.
474 The global variable `optind' will say how many arguments we used up. */
477 decode_options (argc
, argv
)
481 alternate_editor
= egetenv ("ALTERNATE_EDITOR");
483 /* We used to set `display' to $DISPLAY by default, but this changed the
484 default behavior and is sometimes inconvenient. So instead of forcing
485 users to say "--display ''" when they want to use Emacs's existing tty
486 or display connection, we force them to use "--display $DISPLAY" if
487 they want Emacs to connect to their current display. */
489 display
= egetenv ("DISPLAY");
494 int opt
= getopt_long (argc
, argv
,
495 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
508 /* If getopt returns 0, then it has already processed a
509 long-named option. We should do nothing. */
513 alternate_editor
= optarg
;
516 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
518 socket_name
= optarg
;
523 server_file
= optarg
;
526 /* We used to disallow this argument in w32, but it seems better
527 to allow it, for the occasional case where the user is
528 connecting with a w32 client to a server compiled with X11
530 #if 1 /* !defined WINDOWS */
545 message (FALSE
, "emacsclient %s\n", VERSION
);
559 print_help_and_exit ();
563 message (TRUE
, "Try `%s --help' for more information\n", progname
);
569 if (display
&& strlen (display
) == 0)
574 #if !defined (WINDOWSNT) && !defined (HAVE_CARBON)
579 /* --no-wait implies --current-frame on ttys when there are file
580 arguments or expressions given. */
581 if (nowait
&& tty
&& argc
- optind
> 0)
596 print_help_and_exit ()
598 /* Spaces and tabs are significant in this message; they're chosen so the
599 message aligns properly both in a tty and in a Windows message box.
600 Please try to preserve them; otherwise the output is very hard to read
601 when using emacsclientw. */
603 "Usage: %s [OPTIONS] FILE...\n\
604 Tell the Emacs server to visit the specified files.\n\
605 Every FILE can be either just a FILENAME or [+LINE[:COLUMN]] FILENAME.\n\
607 The following OPTIONS are accepted:\n\
608 -V, --version Just print version info and return\n\
609 -H, --help Print this usage information message\n\
610 -t, --tty Open a new Emacs frame on the current terminal\n\
611 -c, --create-frame Create a new frame instead of trying to\n\
612 use the current Emacs frame\n\
613 -e, --eval Evaluate the FILE arguments as ELisp expressions\n\
614 -n, --no-wait Don't wait for the server to return\n"
616 "-d, --display=DISPLAY Visit the file in the given display\n"
618 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
619 "-s, --socket-name=FILENAME\n\
620 Set filename of the UNIX socket for communication\n"
622 "-f, --server-file=FILENAME\n\
623 Set filename of the TCP authentication file\n\
624 -a, --alternate-editor=EDITOR\n\
625 Editor to fallback to if the server is not running\n\
627 Report bugs to bug-gnu-emacs@gnu.org.\n", progname
);
632 Try to run a different command, or --if no alternate editor is
633 defined-- exit with an errorcode.
634 Uses argv, but gets it from the global variable main_argv.
639 if (alternate_editor
)
643 execvp (alternate_editor
, main_argv
+ i
);
644 message (TRUE
, "%s: error executing alternate editor \"%s\"\n",
645 progname
, alternate_editor
);
651 #if !defined (HAVE_SOCKETS) || !defined (HAVE_INET_SOCKETS)
660 message (TRUE
, "%s: Sorry, the Emacs server is supported only\n"
661 "on systems with Berkeley sockets.\n",
666 #else /* HAVE_SOCKETS && HAVE_INET_SOCKETS */
669 # include <winsock2.h>
671 # include <sys/types.h>
672 # include <sys/socket.h>
676 #define AUTH_KEY_LENGTH 64
677 #define SEND_BUFFER_SIZE 4096
679 extern char *strerror ();
682 /* Buffer to accumulate data to send in TCP connections. */
683 char send_buffer
[SEND_BUFFER_SIZE
+ 1];
684 int sblen
= 0; /* Fill pointer for the send buffer. */
685 /* Socket used to communicate with the Emacs server process. */
686 HSOCKET emacs_socket
= 0;
688 /* On Windows, the socket library was historically separate from the standard
689 C library, so errors are handled differently. */
691 sock_err_message (function_name
)
697 FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM
698 | FORMAT_MESSAGE_ALLOCATE_BUFFER
699 | FORMAT_MESSAGE_ARGUMENT_ARRAY
,
700 NULL
, WSAGetLastError (), 0, (LPTSTR
)&msg
, 0, NULL
);
702 message (TRUE
, "%s: %s: %s\n", progname
, function_name
, msg
);
706 message (TRUE
, "%s: %s: %s\n", progname
, function_name
, strerror (errno
));
711 /* Let's send the data to Emacs when either
712 - the data ends in "\n", or
713 - the buffer is full (but this shouldn't happen)
714 Otherwise, we just accumulate it. */
716 send_to_emacs (s
, data
)
722 int dlen
= strlen (data
);
723 if (dlen
+ sblen
>= SEND_BUFFER_SIZE
)
725 int part
= SEND_BUFFER_SIZE
- sblen
;
726 strncpy (&send_buffer
[sblen
], data
, part
);
728 sblen
= SEND_BUFFER_SIZE
;
732 strcpy (&send_buffer
[sblen
], data
);
739 if (sblen
== SEND_BUFFER_SIZE
740 || (sblen
> 0 && send_buffer
[sblen
-1] == '\n'))
742 int sent
= send (s
, send_buffer
, sblen
, 0);
744 strcpy (send_buffer
, &send_buffer
[sent
]);
751 /* In STR, insert a & before each &, each space, each newline, and
752 any initial -. Change spaces to underscores, too, so that the
753 return value never contains a space.
755 Does not change the string. Outputs the result to STREAM. */
757 quote_argument (s
, str
)
761 char *copy
= (char *) xmalloc (strlen (str
) * 2 + 1);
782 if (*p
== '&' || (*p
== '-' && p
== str
))
789 send_to_emacs (s
, copy
);
795 /* The inverse of quote_argument. Removes quoting in string STR by
796 modifying the string in place. Returns STR. */
799 unquote_argument (str
)
831 file_name_absolute_p (filename
)
832 const unsigned char *filename
;
834 /* Sanity check, it shouldn't happen. */
835 if (! filename
) return FALSE
;
837 /* /xxx is always an absolute path. */
838 if (filename
[0] == '/') return TRUE
;
840 /* Empty filenames (which shouldn't happen) are relative. */
841 if (filename
[0] == '\0') return FALSE
;
844 /* X:\xxx is always absolute. */
845 if (isalpha (filename
[0])
846 && filename
[1] == ':' && (filename
[2] == '\\' || filename
[2] == '/'))
849 /* Both \xxx and \\xxx\yyy are absolute. */
850 if (filename
[0] == '\\') return TRUE
;
853 FIXME: There's a corner case not dealt with, "x:y", where:
855 1) x is a valid drive designation (usually a letter in the A-Z range)
856 and y is a path, relative to the current directory on drive x. This
857 is absolute, *after* fixing the y part to include the current
860 2) x is a relative file name, and y is an NTFS stream name. This is a
861 correct relative path, but it is very unusual.
863 The trouble is that first case items are also valid examples of the
864 second case, i.e., "c:test" can be understood as drive:path or as
867 The "right" fix would involve checking whether
868 - the current drive/partition is NTFS,
869 - x is a valid (and accesible) drive designator,
870 - x:y already exists as a file:stream in the current directory,
871 - y already exists on the current directory of drive x,
872 - the auspices are favorable,
873 and then taking an "informed decision" based on the above.
875 Whatever the result, Emacs currently does a very bad job of dealing
876 with NTFS file:streams: it cannot visit them, and the only way to
877 create one is by setting `buffer-file-name' to point to it (either
878 manually or with emacsclient). So perhaps resorting to 1) and ignoring
879 2) for now is the right thing to do.
881 Anyway, something to decide After the Release.
889 /* Wrapper to make WSACleanup a cdecl, as required by atexit. */
891 __cdecl
close_winsock ()
896 /* Initialize the WinSock2 library. */
898 initialize_sockets ()
902 if (WSAStartup (MAKEWORD (2, 0), &wsaData
))
904 message (TRUE
, "%s: error initializing WinSock2\n", progname
);
908 atexit (close_winsock
);
910 #endif /* WINDOWSNT */
914 * Read the information needed to set up a TCP comm channel with
915 * the Emacs server: host, port, pid and authentication string.
918 get_server_config (server
, authentication
)
919 struct sockaddr_in
*server
;
920 char *authentication
;
927 if (file_name_absolute_p (server_file
))
928 config
= fopen (server_file
, "rb");
931 char *home
= egetenv ("HOME");
935 char *path
= alloca (32 + strlen (home
) + strlen (server_file
));
936 sprintf (path
, "%s/.emacs.d/server/%s", home
, server_file
);
937 config
= fopen (path
, "rb");
940 if (!config
&& (home
= egetenv ("APPDATA")))
942 char *path
= alloca (32 + strlen (home
) + strlen (server_file
));
943 sprintf (path
, "%s/.emacs.d/server/%s", home
, server_file
);
944 config
= fopen (path
, "rb");
952 if (fgets (dotted
, sizeof dotted
, config
)
953 && (port
= strchr (dotted
, ':'))
954 && (pid
= strchr (port
, ' ')))
961 message (TRUE
, "%s: invalid configuration info\n", progname
);
965 server
->sin_family
= AF_INET
;
966 server
->sin_addr
.s_addr
= inet_addr (dotted
);
967 server
->sin_port
= htons (atoi (port
));
969 if (! fread (authentication
, AUTH_KEY_LENGTH
, 1, config
))
971 message (TRUE
, "%s: cannot read authentication info\n", progname
);
977 emacs_pid
= atoi (pid
);
986 struct sockaddr_in server
;
987 struct linger l_arg
= {1, 1};
988 char auth_string
[AUTH_KEY_LENGTH
+ 1];
990 if (! get_server_config (&server
, auth_string
))
991 return INVALID_SOCKET
;
993 if (server
.sin_addr
.s_addr
!= inet_addr ("127.0.0.1"))
994 message (FALSE
, "%s: connected to remote socket at %s\n",
995 progname
, inet_ntoa (server
.sin_addr
));
998 * Open up an AF_INET socket
1000 if ((s
= socket (AF_INET
, SOCK_STREAM
, IPPROTO_TCP
)) < 0)
1002 sock_err_message ("socket");
1003 return INVALID_SOCKET
;
1009 if (connect (s
, (struct sockaddr
*) &server
, sizeof server
) < 0)
1011 sock_err_message ("connect");
1012 return INVALID_SOCKET
;
1015 setsockopt (s
, SOL_SOCKET
, SO_LINGER
, (char *) &l_arg
, sizeof l_arg
);
1018 * Send the authentication
1020 auth_string
[AUTH_KEY_LENGTH
] = '\0';
1022 send_to_emacs (s
, "-auth ");
1023 send_to_emacs (s
, auth_string
);
1024 send_to_emacs (s
, " ");
1030 /* Returns 1 if PREFIX is a prefix of STRING. */
1032 strprefix (char *prefix
, char *string
)
1034 return !strncmp (prefix
, string
, strlen (prefix
));
1038 #if !defined (NO_SOCKETS_IN_FILE_SYSTEM)
1040 /* Three possibilities:
1041 2 - can't be `stat'ed (sets errno)
1042 1 - isn't owned by us
1043 0 - success: none of the above */
1046 socket_status (socket_name
)
1049 struct stat statbfr
;
1051 if (stat (socket_name
, &statbfr
) == -1)
1054 if (statbfr
.st_uid
!= geteuid ())
1061 /* A signal handler that passes the signal to the Emacs process.
1062 Useful for SIGWINCH. */
1065 pass_signal_to_emacs (int signalnum
)
1067 int old_errno
= errno
;
1070 kill (emacs_pid
, signalnum
);
1072 signal (signalnum
, pass_signal_to_emacs
);
1076 /* Signal handler for SIGCONT; notify the Emacs process that it can
1077 now resume our tty frame. */
1080 handle_sigcont (int signalnum
)
1082 int old_errno
= errno
;
1084 if (tcgetpgrp (1) == getpgrp ())
1086 /* We are in the foreground. */
1087 send_to_emacs (emacs_socket
, "-resume \n");
1091 /* We are in the background; cancel the continue. */
1092 kill (getpid (), SIGSTOP
);
1095 signal (signalnum
, handle_sigcont
);
1099 /* Signal handler for SIGTSTP; notify the Emacs process that we are
1100 going to sleep. Normally the suspend is initiated by Emacs via
1101 server-handle-suspend-tty, but if the server gets out of sync with
1102 reality, we may get a SIGTSTP on C-z. Handling this signal and
1103 notifying Emacs about it should get things under control again. */
1106 handle_sigtstp (int signalnum
)
1108 int old_errno
= errno
;
1112 send_to_emacs (emacs_socket
, "-suspend \n");
1114 /* Unblock this signal and call the default handler by temporarily
1115 changing the handler and resignalling. */
1116 sigprocmask (SIG_BLOCK
, NULL
, &set
);
1117 sigdelset (&set
, signalnum
);
1118 signal (signalnum
, SIG_DFL
);
1119 kill (getpid (), signalnum
);
1120 sigprocmask (SIG_SETMASK
, &set
, NULL
); /* Let's the above signal through. */
1121 signal (signalnum
, handle_sigtstp
);
1125 /* Set up signal handlers before opening a frame on the current tty. */
1130 /* Set up signal handlers. */
1131 signal (SIGWINCH
, pass_signal_to_emacs
);
1133 /* Don't pass SIGINT and SIGQUIT to Emacs, because it has no way of
1134 deciding which terminal the signal came from. C-g is now a
1135 normal input event on secondary terminals. */
1137 signal (SIGINT
, pass_signal_to_emacs
);
1138 signal (SIGQUIT
, pass_signal_to_emacs
);
1141 signal (SIGCONT
, handle_sigcont
);
1142 signal (SIGTSTP
, handle_sigtstp
);
1143 signal (SIGTTOU
, handle_sigtstp
);
1151 struct sockaddr_un server
;
1154 * Open up an AF_UNIX socket in this person's home directory
1157 if ((s
= socket (AF_UNIX
, SOCK_STREAM
, 0)) < 0)
1159 message (TRUE
, "%s: socket: %s\n", progname
, strerror (errno
));
1160 return INVALID_SOCKET
;
1163 server
.sun_family
= AF_UNIX
;
1166 int sock_status
= 0;
1167 int default_sock
= !socket_name
;
1168 int saved_errno
= 0;
1169 char *server_name
= "server";
1171 if (socket_name
&& !index (socket_name
, '/') && !index (socket_name
, '\\'))
1172 { /* socket_name is a file name component. */
1173 server_name
= socket_name
;
1175 default_sock
= 1; /* Try both UIDs. */
1180 socket_name
= alloca (100 + strlen (server_name
));
1181 sprintf (socket_name
, "/tmp/emacs%d/%s",
1182 (int) geteuid (), server_name
);
1185 if (strlen (socket_name
) < sizeof (server
.sun_path
))
1186 strcpy (server
.sun_path
, socket_name
);
1189 message (TRUE
, "%s: socket-name %s too long\n",
1190 progname
, socket_name
);
1194 /* See if the socket exists, and if it's owned by us. */
1195 sock_status
= socket_status (server
.sun_path
);
1196 saved_errno
= errno
;
1197 if (sock_status
&& default_sock
)
1199 /* Failing that, see if LOGNAME or USER exist and differ from
1200 our euid. If so, look for a socket based on the UID
1201 associated with the name. This is reminiscent of the logic
1202 that init_editfns uses to set the global Vuser_full_name. */
1204 char *user_name
= (char *) egetenv ("LOGNAME");
1207 user_name
= (char *) egetenv ("USER");
1211 struct passwd
*pw
= getpwnam (user_name
);
1213 if (pw
&& (pw
->pw_uid
!= geteuid ()))
1215 /* We're running under su, apparently. */
1216 socket_name
= alloca (100 + strlen (server_name
));
1217 sprintf (socket_name
, "/tmp/emacs%d/%s",
1218 (int) pw
->pw_uid
, server_name
);
1220 if (strlen (socket_name
) < sizeof (server
.sun_path
))
1221 strcpy (server
.sun_path
, socket_name
);
1224 message (TRUE
, "%s: socket-name %s too long\n",
1225 progname
, socket_name
);
1226 exit (EXIT_FAILURE
);
1229 sock_status
= socket_status (server
.sun_path
);
1230 saved_errno
= errno
;
1233 errno
= saved_errno
;
1237 switch (sock_status
)
1240 /* There's a socket, but it isn't owned by us. This is OK if
1242 if (0 != geteuid ())
1244 message (TRUE
, "%s: Invalid socket owner\n", progname
);
1245 return INVALID_SOCKET
;
1251 if (saved_errno
== ENOENT
)
1253 "%s: can't find socket; have you started the server?\n\
1254 To start the server in Emacs, type \"M-x server-start\".\n",
1257 message (TRUE
, "%s: can't stat %s: %s\n",
1258 progname
, server
.sun_path
, strerror (saved_errno
));
1259 return INVALID_SOCKET
;
1263 if (connect (s
, (struct sockaddr
*) &server
, strlen (server
.sun_path
) + 2)
1266 message (TRUE
, "%s: connect: %s\n", progname
, strerror (errno
));
1267 return INVALID_SOCKET
;
1272 #endif /* ! NO_SOCKETS_IN_FILE_SYSTEM */
1281 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
1282 /* Explicit --socket-name argument. */
1285 s
= set_local_socket ();
1286 if ((s
!= INVALID_SOCKET
) || alternate_editor
)
1288 message (TRUE
, "%s: error accessing socket \"%s\"\n",
1289 progname
, socket_name
);
1290 exit (EXIT_FAILURE
);
1294 /* Explicit --server-file arg or EMACS_SERVER_FILE variable. */
1296 server_file
= egetenv ("EMACS_SERVER_FILE");
1300 s
= set_tcp_socket ();
1301 if ((s
!= INVALID_SOCKET
) || alternate_editor
)
1304 message (TRUE
, "%s: error accessing server file \"%s\"\n",
1305 progname
, server_file
);
1306 exit (EXIT_FAILURE
);
1309 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
1310 /* Implicit local socket. */
1311 s
= set_local_socket ();
1312 if (s
!= INVALID_SOCKET
)
1316 /* Implicit server file. */
1317 server_file
= "server";
1318 s
= set_tcp_socket ();
1319 if ((s
!= INVALID_SOCKET
) || alternate_editor
)
1322 /* No implicit or explicit socket, and no alternate editor. */
1323 message (TRUE
, "%s: No socket or alternate editor. Please use:\n\n"
1324 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
1327 "\t--server-file (or environment variable EMACS_SERVER_FILE)\n\
1328 \t--alternate-editor (or environment variable ALTERNATE_EDITOR)\n",
1330 exit (EXIT_FAILURE
);
1334 FARPROC set_fg
; /* Pointer to AllowSetForegroundWindow. */
1335 FARPROC get_wc
; /* Pointer to RealGetWindowClassA. */
1338 w32_find_emacs_process (hWnd
, lParam
)
1345 /* Reject any window not of class "Emacs". */
1346 if (! get_wc (hWnd
, class, sizeof (class))
1347 || strcmp (class, "Emacs"))
1350 /* We only need the process id, not the thread id. */
1351 (void) GetWindowThreadProcessId (hWnd
, &pid
);
1353 /* Not the one we're looking for. */
1354 if (pid
!= (DWORD
) emacs_pid
) return TRUE
;
1356 /* OK, let's raise it. */
1359 /* Stop enumeration. */
1364 * Search for a window of class "Emacs" and owned by a process with
1365 * process id = emacs_pid. If found, allow it to grab the focus.
1372 /* It shouldn't happen when dealing with TCP sockets. */
1373 if (!emacs_pid
) return;
1375 if (!(hUser32
= LoadLibrary ("user32.dll"))) return;
1377 /* Modern Windows restrict which processes can set the foreground window.
1378 emacsclient can allow Emacs to grab the focus by calling the function
1379 AllowSetForegroundWindow. Unfortunately, older Windows (W95, W98 and
1380 NT) lack this function, so we have to check its availability. */
1381 if ((set_fg
= GetProcAddress (hUser32
, "AllowSetForegroundWindow"))
1382 && (get_wc
= GetProcAddress (hUser32
, "RealGetWindowClassA")))
1383 EnumWindows (w32_find_emacs_process
, (LPARAM
) 0);
1385 FreeLibrary (hUser32
);
1394 int i
, rl
, needlf
= 0;
1396 char string
[BUFSIZ
+1];
1401 /* Process options. */
1402 decode_options (argc
, argv
);
1404 if ((argc
- optind
< 1) && !eval
&& !tty
&& !window_system
)
1406 message (TRUE
, "%s: file name or argument required\n"
1407 "Try `%s --help' for more information\n",
1408 progname
, progname
);
1409 exit (EXIT_FAILURE
);
1412 if ((emacs_socket
= set_socket ()) == INVALID_SOCKET
)
1416 cwd
= get_current_dir_name ();
1419 /* getwd puts message in STRING if it fails. */
1420 message (TRUE
, "%s: %s\n", progname
,
1421 "Cannot get current working directory");
1429 /* Send over our environment. */
1432 extern char **environ
;
1434 for (i
= 0; environ
[i
]; i
++)
1436 char *name
= xstrdup (environ
[i
]);
1437 char *value
= strchr (name
, '=');
1438 send_to_emacs (emacs_socket
, "-env ");
1439 quote_argument (emacs_socket
, environ
[i
]);
1440 send_to_emacs (emacs_socket
, " ");
1444 /* Send over our current directory. */
1447 send_to_emacs (emacs_socket
, "-dir ");
1448 quote_argument (emacs_socket
, cwd
);
1449 send_to_emacs (emacs_socket
, "/");
1450 send_to_emacs (emacs_socket
, " ");
1455 send_to_emacs (emacs_socket
, "-nowait ");
1458 send_to_emacs (emacs_socket
, "-current-frame ");
1462 send_to_emacs (emacs_socket
, "-display ");
1463 quote_argument (emacs_socket
, display
);
1464 send_to_emacs (emacs_socket
, " ");
1469 char *type
= egetenv ("TERM");
1470 char *tty_name
= NULL
;
1472 tty_name
= ttyname (fileno (stdin
));
1477 message (TRUE
, "%s: could not get terminal name\n", progname
);
1483 message (TRUE
, "%s: please set the TERM variable to your terminal type\n",
1488 if (! strcmp (type
, "eterm"))
1490 /* This causes nasty, MULTI_KBOARD-related input lockouts. */
1491 message (TRUE
, "%s: opening a frame in an Emacs term buffer"
1492 " is not supported\n", progname
);
1495 #if !defined (NO_SOCKETS_IN_FILE_SYSTEM)
1499 send_to_emacs (emacs_socket
, "-tty ");
1500 quote_argument (emacs_socket
, tty_name
);
1501 send_to_emacs (emacs_socket
, " ");
1502 quote_argument (emacs_socket
, type
);
1503 send_to_emacs (emacs_socket
, " ");
1507 send_to_emacs (emacs_socket
, "-window-system ");
1509 if ((argc
- optind
> 0))
1511 for (i
= optind
; i
< argc
; i
++)
1517 /* Don't prepend cwd or anything like that. */
1518 send_to_emacs (emacs_socket
, "-eval ");
1519 quote_argument (emacs_socket
, argv
[i
]);
1520 send_to_emacs (emacs_socket
, " ");
1524 if (*argv
[i
] == '+')
1526 char *p
= argv
[i
] + 1;
1527 while (isdigit ((unsigned char) *p
) || *p
== ':') p
++;
1530 send_to_emacs (emacs_socket
, "-position ");
1531 quote_argument (emacs_socket
, argv
[i
]);
1532 send_to_emacs (emacs_socket
, " ");
1538 else if (! file_name_absolute_p (argv
[i
]))
1541 send_to_emacs (emacs_socket
, "-file ");
1544 quote_argument (emacs_socket
, cwd
);
1545 send_to_emacs (emacs_socket
, "/");
1547 quote_argument (emacs_socket
, argv
[i
]);
1548 send_to_emacs (emacs_socket
, " ");
1553 if (!tty
&& !window_system
)
1555 while ((str
= fgets (string
, BUFSIZ
, stdin
)))
1558 send_to_emacs (emacs_socket
, "-eval ");
1560 send_to_emacs (emacs_socket
, "-file ");
1561 quote_argument (emacs_socket
, str
);
1563 send_to_emacs (emacs_socket
, " ");
1567 send_to_emacs (emacs_socket
, "\n");
1569 /* Wait for an answer. */
1570 if (!eval
&& !tty
&& !nowait
)
1572 printf ("Waiting for Emacs...");
1578 /* Now, wait for an answer and print any messages. */
1579 while ((rl
= recv (emacs_socket
, string
, BUFSIZ
, 0)) > 0)
1584 p
= string
+ strlen (string
) - 1;
1585 while (p
> string
&& *p
== '\n')
1588 if (strprefix ("-emacs-pid ", string
))
1590 /* -emacs-pid PID: The process id of the Emacs process. */
1591 emacs_pid
= strtol (string
+ strlen ("-emacs-pid"), NULL
, 10);
1593 else if (strprefix ("-window-system-unsupported ", string
))
1595 /* -window-system-unsupported: Emacs was compiled without X
1596 support. Try again on the terminal. */
1602 else if (strprefix ("-print ", string
))
1604 /* -print STRING: Print STRING on the terminal. */
1605 str
= unquote_argument (string
+ strlen ("-print "));
1609 needlf
= str
[0] == '\0' ? needlf
: str
[strlen (str
) - 1] != '\n';
1611 else if (strprefix ("-error ", string
))
1613 /* -error DESCRIPTION: Signal an error on the terminal. */
1614 str
= unquote_argument (string
+ strlen ("-error "));
1617 fprintf (stderr
, "*ERROR*: %s", str
);
1618 needlf
= str
[0] == '\0' ? needlf
: str
[strlen (str
) - 1] != '\n';
1621 else if (strprefix ("-suspend ", string
))
1623 /* -suspend: Suspend this terminal, i.e., stop the process. */
1632 /* Unknown command. */
1635 printf ("*ERROR*: Unknown message: %s", string
);
1636 needlf
= string
[0] == '\0' ? needlf
: string
[strlen (string
) - 1] != '\n';
1645 CLOSE_SOCKET (emacs_socket
);
1646 return EXIT_SUCCESS
;
1649 #endif /* HAVE_SOCKETS && HAVE_INET_SOCKETS */
1652 #ifndef HAVE_STRERROR
1657 extern char *sys_errlist
[];
1658 extern int sys_nerr
;
1660 if (errnum
>= 0 && errnum
< sys_nerr
)
1661 return sys_errlist
[errnum
];
1662 return (char *) "Unknown error";
1665 #endif /* ! HAVE_STRERROR */
1667 /* arch-tag: f39bb9c4-73eb-477e-896d-50832e2ca9a7
1668 (do not change this comment) */
1670 /* emacsclient.c ends here */