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 display
= egetenv ("DISPLAY");
484 if (display
&& strlen (display
) == 0)
490 int opt
= getopt_long (argc
, argv
,
491 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
504 /* If getopt returns 0, then it has already processed a
505 long-named option. We should do nothing. */
509 alternate_editor
= optarg
;
512 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
514 socket_name
= optarg
;
519 server_file
= optarg
;
537 message (FALSE
, "emacsclient %s\n", VERSION
);
551 print_help_and_exit ();
555 message (TRUE
, "Try `%s --help' for more information\n", progname
);
563 #if !defined (WINDOWSNT) && !defined (HAVE_CARBON)
568 /* --no-wait implies --current-frame on ttys when there are file
569 arguments or expressions given. */
570 if (nowait
&& tty
&& argc
- optind
> 0)
585 print_help_and_exit ()
587 /* Spaces and tabs are significant in this message; they're chosen so the
588 message aligns properly both in a tty and in a Windows message box.
589 Please try to preserve them; otherwise the output is very hard to read
590 when using emacsclientw. */
592 "Usage: %s [OPTIONS] FILE...\n\
593 Tell the Emacs server to visit the specified files.\n\
594 Every FILE can be either just a FILENAME or [+LINE[:COLUMN]] FILENAME.\n\
596 The following OPTIONS are accepted:\n\
597 -V, --version Just print version info and return\n\
598 -H, --help Print this usage information message\n\
599 -t, --tty Open a new Emacs frame on the current terminal\n\
600 -c, --create-frame Create a new frame instead of trying to\n\
601 use the current Emacs frame\n\
602 -e, --eval Evaluate the FILE arguments as ELisp expressions\n\
603 -n, --no-wait Don't wait for the server to return\n"
605 "-d, --display=DISPLAY Visit the file in the given display\n"
607 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
608 "-s, --socket-name=FILENAME\n\
609 Set filename of the UNIX socket for communication\n"
611 "-f, --server-file=FILENAME\n\
612 Set filename of the TCP authentication file\n\
613 -a, --alternate-editor=EDITOR\n\
614 Editor to fallback to if the server is not running\n\
616 Report bugs to bug-gnu-emacs@gnu.org.\n", progname
);
621 Try to run a different command, or --if no alternate editor is
622 defined-- exit with an errorcode.
623 Uses argv, but gets it from the global variable main_argv.
628 if (alternate_editor
)
632 execvp (alternate_editor
, main_argv
+ i
);
633 message (TRUE
, "%s: error executing alternate editor \"%s\"\n",
634 progname
, alternate_editor
);
640 #if !defined (HAVE_SOCKETS) || !defined (HAVE_INET_SOCKETS)
649 message (TRUE
, "%s: Sorry, the Emacs server is supported only\n"
650 "on systems with Berkeley sockets.\n",
655 #else /* HAVE_SOCKETS && HAVE_INET_SOCKETS */
658 # include <winsock2.h>
660 # include <sys/types.h>
661 # include <sys/socket.h>
665 #define AUTH_KEY_LENGTH 64
666 #define SEND_BUFFER_SIZE 4096
668 extern char *strerror ();
671 /* Buffer to accumulate data to send in TCP connections. */
672 char send_buffer
[SEND_BUFFER_SIZE
+ 1];
673 int sblen
= 0; /* Fill pointer for the send buffer. */
674 /* Socket used to communicate with the Emacs server process. */
675 HSOCKET emacs_socket
= 0;
677 /* On Windows, the socket library was historically separate from the standard
678 C library, so errors are handled differently. */
680 sock_err_message (function_name
)
686 FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM
687 | FORMAT_MESSAGE_ALLOCATE_BUFFER
688 | FORMAT_MESSAGE_ARGUMENT_ARRAY
,
689 NULL
, WSAGetLastError (), 0, (LPTSTR
)&msg
, 0, NULL
);
691 message (TRUE
, "%s: %s: %s\n", progname
, function_name
, msg
);
695 message (TRUE
, "%s: %s: %s\n", progname
, function_name
, strerror (errno
));
700 /* Let's send the data to Emacs when either
701 - the data ends in "\n", or
702 - the buffer is full (but this shouldn't happen)
703 Otherwise, we just accumulate it. */
705 send_to_emacs (s
, data
)
711 int dlen
= strlen (data
);
712 if (dlen
+ sblen
>= SEND_BUFFER_SIZE
)
714 int part
= SEND_BUFFER_SIZE
- sblen
;
715 strncpy (&send_buffer
[sblen
], data
, part
);
717 sblen
= SEND_BUFFER_SIZE
;
721 strcpy (&send_buffer
[sblen
], data
);
728 if (sblen
== SEND_BUFFER_SIZE
729 || (sblen
> 0 && send_buffer
[sblen
-1] == '\n'))
731 int sent
= send (s
, send_buffer
, sblen
, 0);
733 strcpy (send_buffer
, &send_buffer
[sent
]);
740 /* In STR, insert a & before each &, each space, each newline, and
741 any initial -. Change spaces to underscores, too, so that the
742 return value never contains a space.
744 Does not change the string. Outputs the result to STREAM. */
746 quote_argument (s
, str
)
750 char *copy
= (char *) xmalloc (strlen (str
) * 2 + 1);
771 if (*p
== '&' || (*p
== '-' && p
== str
))
778 send_to_emacs (s
, copy
);
784 /* The inverse of quote_argument. Removes quoting in string STR by
785 modifying the string in place. Returns STR. */
788 unquote_argument (str
)
820 file_name_absolute_p (filename
)
821 const unsigned char *filename
;
823 /* Sanity check, it shouldn't happen. */
824 if (! filename
) return FALSE
;
826 /* /xxx is always an absolute path. */
827 if (filename
[0] == '/') return TRUE
;
829 /* Empty filenames (which shouldn't happen) are relative. */
830 if (filename
[0] == '\0') return FALSE
;
833 /* X:\xxx is always absolute. */
834 if (isalpha (filename
[0])
835 && filename
[1] == ':' && (filename
[2] == '\\' || filename
[2] == '/'))
838 /* Both \xxx and \\xxx\yyy are absolute. */
839 if (filename
[0] == '\\') return TRUE
;
842 FIXME: There's a corner case not dealt with, "x:y", where:
844 1) x is a valid drive designation (usually a letter in the A-Z range)
845 and y is a path, relative to the current directory on drive x. This
846 is absolute, *after* fixing the y part to include the current
849 2) x is a relative file name, and y is an NTFS stream name. This is a
850 correct relative path, but it is very unusual.
852 The trouble is that first case items are also valid examples of the
853 second case, i.e., "c:test" can be understood as drive:path or as
856 The "right" fix would involve checking whether
857 - the current drive/partition is NTFS,
858 - x is a valid (and accesible) drive designator,
859 - x:y already exists as a file:stream in the current directory,
860 - y already exists on the current directory of drive x,
861 - the auspices are favorable,
862 and then taking an "informed decision" based on the above.
864 Whatever the result, Emacs currently does a very bad job of dealing
865 with NTFS file:streams: it cannot visit them, and the only way to
866 create one is by setting `buffer-file-name' to point to it (either
867 manually or with emacsclient). So perhaps resorting to 1) and ignoring
868 2) for now is the right thing to do.
870 Anyway, something to decide After the Release.
878 /* Wrapper to make WSACleanup a cdecl, as required by atexit. */
880 __cdecl
close_winsock ()
885 /* Initialize the WinSock2 library. */
887 initialize_sockets ()
891 if (WSAStartup (MAKEWORD (2, 0), &wsaData
))
893 message (TRUE
, "%s: error initializing WinSock2\n", progname
);
897 atexit (close_winsock
);
899 #endif /* WINDOWSNT */
903 * Read the information needed to set up a TCP comm channel with
904 * the Emacs server: host, port, pid and authentication string.
907 get_server_config (server
, authentication
)
908 struct sockaddr_in
*server
;
909 char *authentication
;
916 if (file_name_absolute_p (server_file
))
917 config
= fopen (server_file
, "rb");
920 char *home
= egetenv ("HOME");
924 char *path
= alloca (32 + strlen (home
) + strlen (server_file
));
925 sprintf (path
, "%s/.emacs.d/server/%s", home
, server_file
);
926 config
= fopen (path
, "rb");
929 if (!config
&& (home
= egetenv ("APPDATA")))
931 char *path
= alloca (32 + strlen (home
) + strlen (server_file
));
932 sprintf (path
, "%s/.emacs.d/server/%s", home
, server_file
);
933 config
= fopen (path
, "rb");
941 if (fgets (dotted
, sizeof dotted
, config
)
942 && (port
= strchr (dotted
, ':'))
943 && (pid
= strchr (port
, ' ')))
950 message (TRUE
, "%s: invalid configuration info\n", progname
);
954 server
->sin_family
= AF_INET
;
955 server
->sin_addr
.s_addr
= inet_addr (dotted
);
956 server
->sin_port
= htons (atoi (port
));
958 if (! fread (authentication
, AUTH_KEY_LENGTH
, 1, config
))
960 message (TRUE
, "%s: cannot read authentication info\n", progname
);
966 emacs_pid
= atoi (pid
);
975 struct sockaddr_in server
;
976 struct linger l_arg
= {1, 1};
977 char auth_string
[AUTH_KEY_LENGTH
+ 1];
979 if (! get_server_config (&server
, auth_string
))
980 return INVALID_SOCKET
;
982 if (server
.sin_addr
.s_addr
!= inet_addr ("127.0.0.1"))
983 message (FALSE
, "%s: connected to remote socket at %s\n",
984 progname
, inet_ntoa (server
.sin_addr
));
987 * Open up an AF_INET socket
989 if ((s
= socket (AF_INET
, SOCK_STREAM
, IPPROTO_TCP
)) < 0)
991 sock_err_message ("socket");
992 return INVALID_SOCKET
;
998 if (connect (s
, (struct sockaddr
*) &server
, sizeof server
) < 0)
1000 sock_err_message ("connect");
1001 return INVALID_SOCKET
;
1004 setsockopt (s
, SOL_SOCKET
, SO_LINGER
, (char *) &l_arg
, sizeof l_arg
);
1007 * Send the authentication
1009 auth_string
[AUTH_KEY_LENGTH
] = '\0';
1011 send_to_emacs (s
, "-auth ");
1012 send_to_emacs (s
, auth_string
);
1013 send_to_emacs (s
, "\n");
1019 /* Returns 1 if PREFIX is a prefix of STRING. */
1021 strprefix (char *prefix
, char *string
)
1023 return !strncmp (prefix
, string
, strlen (prefix
));
1027 #if !defined (NO_SOCKETS_IN_FILE_SYSTEM)
1029 /* Three possibilities:
1030 2 - can't be `stat'ed (sets errno)
1031 1 - isn't owned by us
1032 0 - success: none of the above */
1035 socket_status (socket_name
)
1038 struct stat statbfr
;
1040 if (stat (socket_name
, &statbfr
) == -1)
1043 if (statbfr
.st_uid
!= geteuid ())
1050 /* A signal handler that passes the signal to the Emacs process.
1051 Useful for SIGWINCH. */
1054 pass_signal_to_emacs (int signalnum
)
1056 int old_errno
= errno
;
1059 kill (emacs_pid
, signalnum
);
1061 signal (signalnum
, pass_signal_to_emacs
);
1065 /* Signal handler for SIGCONT; notify the Emacs process that it can
1066 now resume our tty frame. */
1069 handle_sigcont (int signalnum
)
1071 int old_errno
= errno
;
1073 if (tcgetpgrp (1) == getpgrp ())
1075 /* We are in the foreground. */
1076 send_to_emacs (emacs_socket
, "-resume \n");
1080 /* We are in the background; cancel the continue. */
1081 kill (getpid (), SIGSTOP
);
1084 signal (signalnum
, handle_sigcont
);
1088 /* Signal handler for SIGTSTP; notify the Emacs process that we are
1089 going to sleep. Normally the suspend is initiated by Emacs via
1090 server-handle-suspend-tty, but if the server gets out of sync with
1091 reality, we may get a SIGTSTP on C-z. Handling this signal and
1092 notifying Emacs about it should get things under control again. */
1095 handle_sigtstp (int signalnum
)
1097 int old_errno
= errno
;
1101 send_to_emacs (emacs_socket
, "-suspend \n");
1103 /* Unblock this signal and call the default handler by temprarily
1104 changing the handler and resignalling. */
1105 sigprocmask (SIG_BLOCK
, NULL
, &set
);
1106 sigdelset (&set
, signalnum
);
1107 signal (signalnum
, SIG_DFL
);
1108 kill (getpid (), signalnum
);
1109 sigprocmask (SIG_SETMASK
, &set
, NULL
); /* Let's the above signal through. */
1110 signal (signalnum
, handle_sigtstp
);
1114 /* Set up signal handlers before opening a frame on the current tty. */
1119 /* Set up signal handlers. */
1120 signal (SIGWINCH
, pass_signal_to_emacs
);
1122 /* Don't pass SIGINT and SIGQUIT to Emacs, because it has no way of
1123 deciding which terminal the signal came from. C-g is now a
1124 normal input event on secondary terminals. */
1126 signal (SIGINT
, pass_signal_to_emacs
);
1127 signal (SIGQUIT
, pass_signal_to_emacs
);
1130 signal (SIGCONT
, handle_sigcont
);
1131 signal (SIGTSTP
, handle_sigtstp
);
1132 signal (SIGTTOU
, handle_sigtstp
);
1140 struct sockaddr_un server
;
1143 * Open up an AF_UNIX socket in this person's home directory
1146 if ((s
= socket (AF_UNIX
, SOCK_STREAM
, 0)) < 0)
1148 message (TRUE
, "%s: socket: %s\n", progname
, strerror (errno
));
1149 return INVALID_SOCKET
;
1152 server
.sun_family
= AF_UNIX
;
1155 int sock_status
= 0;
1156 int default_sock
= !socket_name
;
1157 int saved_errno
= 0;
1158 char *server_name
= "server";
1160 if (socket_name
&& !index (socket_name
, '/') && !index (socket_name
, '\\'))
1161 { /* socket_name is a file name component. */
1162 server_name
= socket_name
;
1164 default_sock
= 1; /* Try both UIDs. */
1169 socket_name
= alloca (100 + strlen (server_name
));
1170 sprintf (socket_name
, "/tmp/emacs%d/%s",
1171 (int) geteuid (), server_name
);
1174 if (strlen (socket_name
) < sizeof (server
.sun_path
))
1175 strcpy (server
.sun_path
, socket_name
);
1178 message (TRUE
, "%s: socket-name %s too long\n",
1179 progname
, socket_name
);
1183 /* See if the socket exists, and if it's owned by us. */
1184 sock_status
= socket_status (server
.sun_path
);
1185 saved_errno
= errno
;
1186 if (sock_status
&& default_sock
)
1188 /* Failing that, see if LOGNAME or USER exist and differ from
1189 our euid. If so, look for a socket based on the UID
1190 associated with the name. This is reminiscent of the logic
1191 that init_editfns uses to set the global Vuser_full_name. */
1193 char *user_name
= (char *) egetenv ("LOGNAME");
1196 user_name
= (char *) egetenv ("USER");
1200 struct passwd
*pw
= getpwnam (user_name
);
1202 if (pw
&& (pw
->pw_uid
!= geteuid ()))
1204 /* We're running under su, apparently. */
1205 socket_name
= alloca (100 + strlen (server_name
));
1206 sprintf (socket_name
, "/tmp/emacs%d/%s",
1207 (int) pw
->pw_uid
, server_name
);
1209 if (strlen (socket_name
) < sizeof (server
.sun_path
))
1210 strcpy (server
.sun_path
, socket_name
);
1213 message (TRUE
, "%s: socket-name %s too long\n",
1214 progname
, socket_name
);
1215 exit (EXIT_FAILURE
);
1218 sock_status
= socket_status (server
.sun_path
);
1219 saved_errno
= errno
;
1222 errno
= saved_errno
;
1226 switch (sock_status
)
1229 /* There's a socket, but it isn't owned by us. This is OK if
1231 if (0 != geteuid ())
1233 message (TRUE
, "%s: Invalid socket owner\n", progname
);
1234 return INVALID_SOCKET
;
1240 if (saved_errno
== ENOENT
)
1242 "%s: can't find socket; have you started the server?\n\
1243 To start the server in Emacs, type \"M-x server-start\".\n",
1246 message (TRUE
, "%s: can't stat %s: %s\n",
1247 progname
, server
.sun_path
, strerror (saved_errno
));
1248 return INVALID_SOCKET
;
1252 if (connect (s
, (struct sockaddr
*) &server
, strlen (server
.sun_path
) + 2)
1255 message (TRUE
, "%s: connect: %s\n", progname
, strerror (errno
));
1256 return INVALID_SOCKET
;
1261 #endif /* ! NO_SOCKETS_IN_FILE_SYSTEM */
1270 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
1271 /* Explicit --socket-name argument. */
1274 s
= set_local_socket ();
1275 if ((s
!= INVALID_SOCKET
) || alternate_editor
)
1277 message (TRUE
, "%s: error accessing socket \"%s\"\n",
1278 progname
, socket_name
);
1279 exit (EXIT_FAILURE
);
1283 /* Explicit --server-file arg or EMACS_SERVER_FILE variable. */
1285 server_file
= egetenv ("EMACS_SERVER_FILE");
1289 s
= set_tcp_socket ();
1290 if ((s
!= INVALID_SOCKET
) || alternate_editor
)
1293 message (TRUE
, "%s: error accessing server file \"%s\"\n",
1294 progname
, server_file
);
1295 exit (EXIT_FAILURE
);
1298 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
1299 /* Implicit local socket. */
1300 s
= set_local_socket ();
1301 if (s
!= INVALID_SOCKET
)
1305 /* Implicit server file. */
1306 server_file
= "server";
1307 s
= set_tcp_socket ();
1308 if ((s
!= INVALID_SOCKET
) || alternate_editor
)
1311 /* No implicit or explicit socket, and no alternate editor. */
1312 message (TRUE
, "%s: No socket or alternate editor. Please use:\n\n"
1313 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
1316 "\t--server-file (or environment variable EMACS_SERVER_FILE)\n\
1317 \t--alternate-editor (or environment variable ALTERNATE_EDITOR)\n",
1319 exit (EXIT_FAILURE
);
1323 FARPROC set_fg
; /* Pointer to AllowSetForegroundWindow. */
1324 FARPROC get_wc
; /* Pointer to RealGetWindowClassA. */
1327 w32_find_emacs_process (hWnd
, lParam
)
1334 /* Reject any window not of class "Emacs". */
1335 if (! get_wc (hWnd
, class, sizeof (class))
1336 || strcmp (class, "Emacs"))
1339 /* We only need the process id, not the thread id. */
1340 (void) GetWindowThreadProcessId (hWnd
, &pid
);
1342 /* Not the one we're looking for. */
1343 if (pid
!= (DWORD
) emacs_pid
) return TRUE
;
1345 /* OK, let's raise it. */
1348 /* Stop enumeration. */
1353 * Search for a window of class "Emacs" and owned by a process with
1354 * process id = emacs_pid. If found, allow it to grab the focus.
1361 /* It shouldn't happen when dealing with TCP sockets. */
1362 if (!emacs_pid
) return;
1364 if (!(hUser32
= LoadLibrary ("user32.dll"))) return;
1366 /* Modern Windows restrict which processes can set the foreground window.
1367 emacsclient can allow Emacs to grab the focus by calling the function
1368 AllowSetForegroundWindow. Unfortunately, older Windows (W95, W98 and
1369 NT) lack this function, so we have to check its availability. */
1370 if ((set_fg
= GetProcAddress (hUser32
, "AllowSetForegroundWindow"))
1371 && (get_wc
= GetProcAddress (hUser32
, "RealGetWindowClassA")))
1372 EnumWindows (w32_find_emacs_process
, (LPARAM
) 0);
1374 FreeLibrary (hUser32
);
1383 int i
, rl
, needlf
= 0;
1385 char string
[BUFSIZ
+1];
1390 /* Process options. */
1391 decode_options (argc
, argv
);
1393 if ((argc
- optind
< 1) && !eval
&& !tty
&& !window_system
)
1395 message (TRUE
, "%s: file name or argument required\n"
1396 "Try `%s --help' for more information\n",
1397 progname
, progname
);
1398 exit (EXIT_FAILURE
);
1401 if ((emacs_socket
= set_socket ()) == INVALID_SOCKET
)
1405 cwd
= get_current_dir_name ();
1408 /* getwd puts message in STRING if it fails. */
1409 message (TRUE
, "%s: %s\n", progname
,
1410 "Cannot get current working directory");
1418 /* Send over our environment. */
1421 extern char **environ
;
1423 for (i
= 0; environ
[i
]; i
++)
1425 char *name
= xstrdup (environ
[i
]);
1426 char *value
= strchr (name
, '=');
1427 send_to_emacs (emacs_socket
, "-env ");
1428 quote_argument (emacs_socket
, environ
[i
]);
1429 send_to_emacs (emacs_socket
, " ");
1433 /* Send over our current directory. */
1436 send_to_emacs (emacs_socket
, "-dir ");
1437 quote_argument (emacs_socket
, cwd
);
1438 send_to_emacs (emacs_socket
, "/");
1439 send_to_emacs (emacs_socket
, " ");
1444 send_to_emacs (emacs_socket
, "-nowait ");
1447 send_to_emacs (emacs_socket
, "-current-frame ");
1451 send_to_emacs (emacs_socket
, "-display ");
1452 quote_argument (emacs_socket
, display
);
1453 send_to_emacs (emacs_socket
, " ");
1458 char *type
= egetenv ("TERM");
1459 char *tty_name
= NULL
;
1461 tty_name
= ttyname (fileno (stdin
));
1466 message (TRUE
, "%s: could not get terminal name\n", progname
);
1472 message (TRUE
, "%s: please set the TERM variable to your terminal type\n",
1477 if (! strcmp (type
, "eterm"))
1479 /* This causes nasty, MULTI_KBOARD-related input lockouts. */
1480 message (TRUE
, "%s: opening a frame in an Emacs term buffer"
1481 " is not supported\n", progname
);
1484 #if !defined (NO_SOCKETS_IN_FILE_SYSTEM)
1488 send_to_emacs (emacs_socket
, "-tty ");
1489 quote_argument (emacs_socket
, tty_name
);
1490 send_to_emacs (emacs_socket
, " ");
1491 quote_argument (emacs_socket
, type
);
1492 send_to_emacs (emacs_socket
, " ");
1496 send_to_emacs (emacs_socket
, "-window-system ");
1498 if ((argc
- optind
> 0))
1500 for (i
= optind
; i
< argc
; i
++)
1506 /* Don't prepend cwd or anything like that. */
1507 send_to_emacs (emacs_socket
, "-eval ");
1508 quote_argument (emacs_socket
, argv
[i
]);
1509 send_to_emacs (emacs_socket
, " ");
1513 if (*argv
[i
] == '+')
1515 char *p
= argv
[i
] + 1;
1516 while (isdigit ((unsigned char) *p
) || *p
== ':') p
++;
1519 send_to_emacs (emacs_socket
, "-position ");
1520 quote_argument (emacs_socket
, argv
[i
]);
1521 send_to_emacs (emacs_socket
, " ");
1527 else if (! file_name_absolute_p (argv
[i
]))
1530 send_to_emacs (emacs_socket
, "-file ");
1533 quote_argument (emacs_socket
, cwd
);
1534 send_to_emacs (emacs_socket
, "/");
1536 quote_argument (emacs_socket
, argv
[i
]);
1537 send_to_emacs (emacs_socket
, " ");
1542 if (!tty
&& !window_system
)
1544 while ((str
= fgets (string
, BUFSIZ
, stdin
)))
1547 send_to_emacs (emacs_socket
, "-eval ");
1549 send_to_emacs (emacs_socket
, "-file ");
1550 quote_argument (emacs_socket
, str
);
1552 send_to_emacs (emacs_socket
, " ");
1556 send_to_emacs (emacs_socket
, "\n");
1558 /* Wait for an answer. */
1559 if (!eval
&& !tty
&& !nowait
)
1561 printf ("Waiting for Emacs...");
1567 /* Now, wait for an answer and print any messages. */
1568 while ((rl
= recv (emacs_socket
, string
, BUFSIZ
, 0)) > 0)
1573 p
= string
+ strlen (string
) - 1;
1574 while (p
> string
&& *p
== '\n')
1577 if (strprefix ("-emacs-pid ", string
))
1579 /* -emacs-pid PID: The process id of the Emacs process. */
1580 emacs_pid
= strtol (string
+ strlen ("-emacs-pid"), NULL
, 10);
1582 else if (strprefix ("-window-system-unsupported ", string
))
1584 /* -window-system-unsupported: Emacs was compiled without X
1585 support. Try again on the terminal. */
1591 else if (strprefix ("-print ", string
))
1593 /* -print STRING: Print STRING on the terminal. */
1594 str
= unquote_argument (string
+ strlen ("-print "));
1598 needlf
= str
[0] == '\0' ? needlf
: str
[strlen (str
) - 1] != '\n';
1600 else if (strprefix ("-error ", string
))
1602 /* -error DESCRIPTION: Signal an error on the terminal. */
1603 str
= unquote_argument (string
+ strlen ("-error "));
1606 fprintf (stderr
, "*ERROR*: %s", str
);
1607 needlf
= str
[0] == '\0' ? needlf
: str
[strlen (str
) - 1] != '\n';
1610 else if (strprefix ("-suspend ", string
))
1612 /* -suspend: Suspend this terminal, i.e., stop the process. */
1621 /* Unknown command. */
1624 printf ("*ERROR*: Unknown message: %s", string
);
1625 needlf
= string
[0] == '\0' ? needlf
: string
[strlen (string
) - 1] != '\n';
1634 CLOSE_SOCKET (emacs_socket
);
1635 return EXIT_SUCCESS
;
1638 #endif /* HAVE_SOCKETS && HAVE_INET_SOCKETS */
1641 #ifndef HAVE_STRERROR
1646 extern char *sys_errlist
[];
1647 extern int sys_nerr
;
1649 if (errnum
>= 0 && errnum
< sys_nerr
)
1650 return sys_errlist
[errnum
];
1651 return (char *) "Unknown error";
1654 #endif /* ! HAVE_STRERROR */
1656 /* arch-tag: f39bb9c4-73eb-477e-896d-50832e2ca9a7
1657 (do not change this comment) */
1659 /* emacsclient.c ends here */