/* Client process that communicates with GNU Emacs acting as server. Copyright (C) 1986, 1987, 1994, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. This file is part of GNU Emacs. GNU Emacs is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. GNU Emacs is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Emacs. If not, see . */ #ifdef HAVE_CONFIG_H #include #endif #ifdef WINDOWSNT /* config.h defines these, which disables sockets altogether! */ # undef _WINSOCKAPI_ # undef _WINSOCK_H # include # include # include # include # define NO_SOCKETS_IN_FILE_SYSTEM # define HSOCKET SOCKET # define CLOSE_SOCKET closesocket # define INITIALIZE() (initialize_sockets ()) #else /* !WINDOWSNT */ # include # ifdef HAVE_INET_SOCKETS # include # endif # define INVALID_SOCKET -1 # define HSOCKET int # define CLOSE_SOCKET close # define INITIALIZE() #endif /* !WINDOWSNT */ #undef signal #include #include #include #include "getopt.h" #ifdef HAVE_UNISTD_H #include #endif #ifdef WINDOWSNT # include #else /* not WINDOWSNT */ # include #endif /* not WINDOWSNT */ #include #include #include char *getenv (), *getwd (); char *(getcwd) (); #ifdef WINDOWSNT char *w32_getenv (); #define egetenv(VAR) w32_getenv(VAR) #else #define egetenv(VAR) getenv(VAR) #endif #ifndef VERSION #define VERSION "unspecified" #endif #ifndef EXIT_SUCCESS #define EXIT_SUCCESS 0 #endif #ifndef EXIT_FAILURE #define EXIT_FAILURE 1 #endif #ifndef FALSE #define FALSE 0 #endif #ifndef TRUE #define TRUE 1 #endif #ifndef NO_RETURN #define NO_RETURN #endif /* Name used to invoke this program. */ char *progname; /* The second argument to main. */ char **main_argv; /* Nonzero means don't wait for a response from Emacs. --no-wait. */ int nowait = 0; /* Nonzero means args are expressions to be evaluated. --eval. */ int eval = 0; /* Nonzero means don't open a new frame. Inverse of --create-frame. */ int current_frame = 1; /* Nonzero means open a new graphical frame. */ int window_system = 0; /* The display on which Emacs should work. --display. */ char *display = NULL; /* Nonzero means open a new Emacs frame on the current terminal. */ int tty = 0; /* If non-NULL, the name of an editor to fallback to if the server is not running. --alternate-editor. */ const char *alternate_editor = NULL; /* If non-NULL, the filename of the UNIX socket. */ char *socket_name = NULL; /* If non-NULL, the filename of the authentication file. */ char *server_file = NULL; /* PID of the Emacs server process. */ int emacs_pid = 0; void print_help_and_exit () NO_RETURN; struct option longopts[] = { { "no-wait", no_argument, NULL, 'n' }, { "eval", no_argument, NULL, 'e' }, { "help", no_argument, NULL, 'H' }, { "version", no_argument, NULL, 'V' }, { "tty", no_argument, NULL, 't' }, { "create-frame", no_argument, NULL, 'c' }, { "alternate-editor", required_argument, NULL, 'a' }, #ifndef NO_SOCKETS_IN_FILE_SYSTEM { "socket-name", required_argument, NULL, 's' }, #endif { "server-file", required_argument, NULL, 'f' }, #ifndef WINDOWSNT { "display", required_argument, NULL, 'd' }, #endif { 0, 0, 0, 0 } }; /* Like malloc but get fatal error if memory is exhausted. */ long * xmalloc (size) unsigned int size; { long *result = (long *) malloc (size); if (result == NULL) { perror ("malloc"); exit (EXIT_FAILURE); } return result; } /* Like strdup but get a fatal error if memory is exhausted. */ char * xstrdup (const char *s) { char *result = strdup (s); if (result == NULL) { perror ("strdup"); exit (EXIT_FAILURE); } return result; } /* From sysdep.c */ #if !defined (HAVE_GET_CURRENT_DIR_NAME) || defined (BROKEN_GET_CURRENT_DIR_NAME) /* From lisp.h */ #ifndef DIRECTORY_SEP #define DIRECTORY_SEP '/' #endif #ifndef IS_DIRECTORY_SEP #define IS_DIRECTORY_SEP(_c_) ((_c_) == DIRECTORY_SEP) #endif #ifndef IS_DEVICE_SEP #ifndef DEVICE_SEP #define IS_DEVICE_SEP(_c_) 0 #else #define IS_DEVICE_SEP(_c_) ((_c_) == DEVICE_SEP) #endif #endif #ifndef IS_ANY_SEP #define IS_ANY_SEP(_c_) (IS_DIRECTORY_SEP (_c_)) #endif /* Return the current working directory. Returns NULL on errors. Any other returned value must be freed with free. This is used only when get_current_dir_name is not defined on the system. */ char* get_current_dir_name () { char *buf; char *pwd; struct stat dotstat, pwdstat; /* If PWD is accurate, use it instead of calling getwd. PWD is sometimes a nicer name, and using it may avoid a fatal error if a parent directory is searchable but not readable. */ if ((pwd = egetenv ("PWD")) != 0 && (IS_DIRECTORY_SEP (*pwd) || (*pwd && IS_DEVICE_SEP (pwd[1]))) && stat (pwd, &pwdstat) == 0 && stat (".", &dotstat) == 0 && dotstat.st_ino == pwdstat.st_ino && dotstat.st_dev == pwdstat.st_dev #ifdef MAXPATHLEN && strlen (pwd) < MAXPATHLEN #endif ) { buf = (char *) xmalloc (strlen (pwd) + 1); if (!buf) return NULL; strcpy (buf, pwd); } #ifdef HAVE_GETCWD else { size_t buf_size = 1024; buf = (char *) xmalloc (buf_size); if (!buf) return NULL; for (;;) { if (getcwd (buf, buf_size) == buf) break; if (errno != ERANGE) { int tmp_errno = errno; free (buf); errno = tmp_errno; return NULL; } buf_size *= 2; buf = (char *) realloc (buf, buf_size); if (!buf) return NULL; } } #else else { /* We need MAXPATHLEN here. */ buf = (char *) xmalloc (MAXPATHLEN + 1); if (!buf) return NULL; if (getwd (buf) == NULL) { int tmp_errno = errno; free (buf); errno = tmp_errno; return NULL; } } #endif return buf; } #endif #ifdef WINDOWSNT #define REG_ROOT "SOFTWARE\\GNU\\Emacs" /* Retrieve an environment variable from the Emacs subkeys of the registry. Return NULL if the variable was not found, or it was empty. This code is based on w32_get_resource (w32.c). */ char * w32_get_resource (predefined, key, type) HKEY predefined; char *key; LPDWORD type; { HKEY hrootkey = NULL; char *result = NULL; DWORD cbData; if (RegOpenKeyEx (predefined, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS) { if (RegQueryValueEx (hrootkey, key, NULL, NULL, NULL, &cbData) == ERROR_SUCCESS) { result = (char *) xmalloc (cbData); if ((RegQueryValueEx (hrootkey, key, NULL, type, result, &cbData) != ERROR_SUCCESS) || (*result == 0)) { free (result); result = NULL; } } RegCloseKey (hrootkey); } return result; } /* getenv wrapper for Windows This is needed to duplicate Emacs's behavior, which is to look for enviroment variables in the registry if they don't appear in the environment. */ char * w32_getenv (envvar) char *envvar; { char *value; DWORD dwType; if (value = getenv (envvar)) /* Found in the environment. */ return value; if (! (value = w32_get_resource (HKEY_CURRENT_USER, envvar, &dwType)) && ! (value = w32_get_resource (HKEY_LOCAL_MACHINE, envvar, &dwType))) /* Not found in the registry. */ return NULL; if (dwType == REG_SZ) /* Registry; no need to expand. */ return value; if (dwType == REG_EXPAND_SZ) { DWORD size; if (size = ExpandEnvironmentStrings (value, NULL, 0)) { char *buffer = (char *) xmalloc (size); if (ExpandEnvironmentStrings (value, buffer, size)) { /* Found and expanded. */ free (value); return buffer; } /* Error expanding. */ free (buffer); } } /* Not the right type, or not correctly expanded. */ free (value); return NULL; } int w32_window_app () { static int window_app = -1; char szTitle[MAX_PATH]; if (window_app < 0) { /* Checking for STDOUT does not work; it's a valid handle also in nonconsole apps. Testing for the console title seems to work. */ window_app = (GetConsoleTitleA (szTitle, MAX_PATH) == 0); if (window_app) InitCommonControls(); } return window_app; } /* execvp wrapper for Windows. Quotes arguments with embedded spaces. This is necessary due to the broken implementation of exec* routines in the Microsoft libraries: they concatenate the arguments together without quoting special characters, and pass the result to CreateProcess, with predictably bad results. By contrast, Posix execvp passes the arguments directly into the argv array of the child process. */ int w32_execvp (path, argv) char *path; char **argv; { int i; /* Required to allow a .BAT script as alternate editor. */ argv[0] = (char *) alternate_editor; for (i = 0; argv[i]; i++) if (strchr (argv[i], ' ')) { char *quoted = alloca (strlen (argv[i]) + 3); sprintf (quoted, "\"%s\"", argv[i]); argv[i] = quoted; } return execvp (path, argv); } #undef execvp #define execvp w32_execvp #endif /* WINDOWSNT */ /* Display a normal or error message. On Windows, use a message box if compiled as a Windows app. */ void message (int is_error, char *message, ...) { char msg [2048]; va_list args; va_start (args, message); vsprintf (msg, message, args); va_end (args); #ifdef WINDOWSNT if (w32_window_app ()) { if (is_error) MessageBox (NULL, msg, "Emacsclient ERROR", MB_ICONERROR); else MessageBox (NULL, msg, "Emacsclient", MB_ICONINFORMATION); } else #endif { FILE *f = is_error ? stderr : stdout; fputs (msg, f); fflush (f); } } /* Decode the options from argv and argc. The global variable `optind' will say how many arguments we used up. */ void decode_options (argc, argv) int argc; char **argv; { alternate_editor = egetenv ("ALTERNATE_EDITOR"); while (1) { int opt = getopt_long (argc, argv, #ifndef NO_SOCKETS_IN_FILE_SYSTEM "VHnea:s:f:d:tc", #else "VHnea:f:d:tc", #endif longopts, 0); if (opt == EOF) break; switch (opt) { case 0: /* If getopt returns 0, then it has already processed a long-named option. We should do nothing. */ break; case 'a': alternate_editor = optarg; break; #ifndef NO_SOCKETS_IN_FILE_SYSTEM case 's': socket_name = optarg; break; #endif case 'f': server_file = optarg; break; /* We used to disallow this argument in w32, but it seems better to allow it, for the occasional case where the user is connecting with a w32 client to a server compiled with X11 support. */ #if 1 /* !defined WINDOWS */ case 'd': display = optarg; break; #endif case 'n': nowait = 1; break; case 'e': eval = 1; break; case 'V': message (FALSE, "emacsclient %s\n", VERSION); exit (EXIT_SUCCESS); break; case 't': tty = 1; current_frame = 0; break; case 'c': current_frame = 0; break; case 'H': print_help_and_exit (); break; default: message (TRUE, "Try `%s --help' for more information\n", progname); exit (EXIT_FAILURE); break; } } /* We used to set `display' to $DISPLAY by default, but this changed the default behavior and is sometimes inconvenient. So instead of forcing users to say "--display ''" when they want to use Emacs's existing tty or display connection, we force them to use "--display $DISPLAY" if they want Emacs to connect to their current display. -c still implicitly passes --display $DISPLAY unless -t was specified so as to try and mimick the behavior of `emacs' which either uses the current tty or the current $DISPLAY. */ if (!current_frame && !tty && !display) display = egetenv ("DISPLAY"); if (display && strlen (display) == 0) display = NULL; if (!tty && display) window_system = 1; #if !defined (WINDOWSNT) else if (!current_frame) tty = 1; #endif /* --no-wait implies --current-frame on ttys when there are file arguments or expressions given. */ if (nowait && tty && argc - optind > 0) current_frame = 1; if (current_frame) { tty = 0; window_system = 0; } if (tty) window_system = 0; } void print_help_and_exit () { /* Spaces and tabs are significant in this message; they're chosen so the message aligns properly both in a tty and in a Windows message box. Please try to preserve them; otherwise the output is very hard to read when using emacsclientw. */ message (FALSE, "Usage: %s [OPTIONS] FILE...\n\ Tell the Emacs server to visit the specified files.\n\ Every FILE can be either just a FILENAME or [+LINE[:COLUMN]] FILENAME.\n\ \n\ The following OPTIONS are accepted:\n\ -V, --version Just print version info and return\n\ -H, --help Print this usage information message\n\ -t, --tty Open a new Emacs frame on the current terminal\n\ -c, --create-frame Create a new frame instead of trying to\n\ use the current Emacs frame\n\ -e, --eval Evaluate the FILE arguments as ELisp expressions\n\ -n, --no-wait Don't wait for the server to return\n\ -d, --display=DISPLAY Visit the file in the given display\n" #ifndef NO_SOCKETS_IN_FILE_SYSTEM "-s, --socket-name=FILENAME\n\ Set filename of the UNIX socket for communication\n" #endif "-f, --server-file=FILENAME\n\ Set filename of the TCP authentication file\n\ -a, --alternate-editor=EDITOR\n\ Editor to fallback to if the server is not running\n\ \n\ Report bugs to bug-gnu-emacs@gnu.org.\n", progname); exit (EXIT_SUCCESS); } /* Try to run a different command, or --if no alternate editor is defined-- exit with an errorcode. Uses argv, but gets it from the global variable main_argv. */ void fail (void) { if (alternate_editor) { int i = optind - 1; execvp (alternate_editor, main_argv + i); message (TRUE, "%s: error executing alternate editor \"%s\"\n", progname, alternate_editor); } exit (EXIT_FAILURE); } #if !defined (HAVE_SOCKETS) || !defined (HAVE_INET_SOCKETS) int main (argc, argv) int argc; char **argv; { main_argv = argv; progname = argv[0]; message (TRUE, "%s: Sorry, the Emacs server is supported only\n" "on systems with Berkeley sockets.\n", argv[0]); fail (); } #else /* HAVE_SOCKETS && HAVE_INET_SOCKETS */ #ifdef WINDOWSNT # include #else # include # include # include #endif #define AUTH_KEY_LENGTH 64 #define SEND_BUFFER_SIZE 4096 extern char *strerror (); extern int errno; /* Buffer to accumulate data to send in TCP connections. */ char send_buffer[SEND_BUFFER_SIZE + 1]; int sblen = 0; /* Fill pointer for the send buffer. */ /* Socket used to communicate with the Emacs server process. */ HSOCKET emacs_socket = 0; /* On Windows, the socket library was historically separate from the standard C library, so errors are handled differently. */ void sock_err_message (function_name) char *function_name; { #ifdef WINDOWSNT char* msg = NULL; FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_ARGUMENT_ARRAY, NULL, WSAGetLastError (), 0, (LPTSTR)&msg, 0, NULL); message (TRUE, "%s: %s: %s\n", progname, function_name, msg); LocalFree (msg); #else message (TRUE, "%s: %s: %s\n", progname, function_name, strerror (errno)); #endif } /* Let's send the data to Emacs when either - the data ends in "\n", or - the buffer is full (but this shouldn't happen) Otherwise, we just accumulate it. */ void send_to_emacs (s, data) HSOCKET s; char *data; { while (data) { int dlen = strlen (data); if (dlen + sblen >= SEND_BUFFER_SIZE) { int part = SEND_BUFFER_SIZE - sblen; strncpy (&send_buffer[sblen], data, part); data += part; sblen = SEND_BUFFER_SIZE; } else if (dlen) { strcpy (&send_buffer[sblen], data); data = NULL; sblen += dlen; } else break; if (sblen == SEND_BUFFER_SIZE || (sblen > 0 && send_buffer[sblen-1] == '\n')) { int sent = send (s, send_buffer, sblen, 0); if (sent != sblen) strcpy (send_buffer, &send_buffer[sent]); sblen -= sent; } } } /* In STR, insert a & before each &, each space, each newline, and any initial -. Change spaces to underscores, too, so that the return value never contains a space. Does not change the string. Outputs the result to STREAM. */ void quote_argument (s, str) HSOCKET s; char *str; { char *copy = (char *) xmalloc (strlen (str) * 2 + 1); char *p, *q; p = str; q = copy; while (*p) { if (*p == ' ') { *q++ = '&'; *q++ = '_'; p++; } else if (*p == '\n') { *q++ = '&'; *q++ = 'n'; p++; } else { if (*p == '&' || (*p == '-' && p == str)) *q++ = '&'; *q++ = *p++; } } *q++ = 0; send_to_emacs (s, copy); free (copy); } /* The inverse of quote_argument. Removes quoting in string STR by modifying the string in place. Returns STR. */ char * unquote_argument (str) char *str; { char *p, *q; if (! str) return str; p = str; q = str; while (*p) { if (*p == '&') { p++; if (*p == '&') *p = '&'; else if (*p == '_') *p = ' '; else if (*p == 'n') *p = '\n'; else if (*p == '-') *p = '-'; } *q++ = *p++; } *q = 0; return str; } int file_name_absolute_p (filename) const unsigned char *filename; { /* Sanity check, it shouldn't happen. */ if (! filename) return FALSE; /* /xxx is always an absolute path. */ if (filename[0] == '/') return TRUE; /* Empty filenames (which shouldn't happen) are relative. */ if (filename[0] == '\0') return FALSE; #ifdef WINDOWSNT /* X:\xxx is always absolute. */ if (isalpha (filename[0]) && filename[1] == ':' && (filename[2] == '\\' || filename[2] == '/')) return TRUE; /* Both \xxx and \\xxx\yyy are absolute. */ if (filename[0] == '\\') return TRUE; #endif return FALSE; } #ifdef WINDOWSNT /* Wrapper to make WSACleanup a cdecl, as required by atexit. */ void __cdecl close_winsock () { WSACleanup (); } /* Initialize the WinSock2 library. */ void initialize_sockets () { WSADATA wsaData; if (WSAStartup (MAKEWORD (2, 0), &wsaData)) { message (TRUE, "%s: error initializing WinSock2\n", progname); exit (EXIT_FAILURE); } atexit (close_winsock); } #endif /* WINDOWSNT */ /* * Read the information needed to set up a TCP comm channel with * the Emacs server: host, port, pid and authentication string. */ int get_server_config (server, authentication) struct sockaddr_in *server; char *authentication; { char dotted[32]; char *port; char *pid; FILE *config = NULL; if (file_name_absolute_p (server_file)) config = fopen (server_file, "rb"); else { char *home = egetenv ("HOME"); if (home) { char *path = alloca (32 + strlen (home) + strlen (server_file)); sprintf (path, "%s/.emacs.d/server/%s", home, server_file); config = fopen (path, "rb"); } #ifdef WINDOWSNT if (!config && (home = egetenv ("APPDATA"))) { char *path = alloca (32 + strlen (home) + strlen (server_file)); sprintf (path, "%s/.emacs.d/server/%s", home, server_file); config = fopen (path, "rb"); } #endif } if (! config) return FALSE; if (fgets (dotted, sizeof dotted, config) && (port = strchr (dotted, ':')) && (pid = strchr (port, ' '))) { *port++ = '\0'; *pid++ = '\0'; } else { message (TRUE, "%s: invalid configuration info\n", progname); exit (EXIT_FAILURE); } server->sin_family = AF_INET; server->sin_addr.s_addr = inet_addr (dotted); server->sin_port = htons (atoi (port)); if (! fread (authentication, AUTH_KEY_LENGTH, 1, config)) { message (TRUE, "%s: cannot read authentication info\n", progname); exit (EXIT_FAILURE); } fclose (config); emacs_pid = atoi (pid); return TRUE; } HSOCKET set_tcp_socket () { HSOCKET s; struct sockaddr_in server; struct linger l_arg = {1, 1}; char auth_string[AUTH_KEY_LENGTH + 1]; if (! get_server_config (&server, auth_string)) return INVALID_SOCKET; if (server.sin_addr.s_addr != inet_addr ("127.0.0.1")) message (FALSE, "%s: connected to remote socket at %s\n", progname, inet_ntoa (server.sin_addr)); /* * Open up an AF_INET socket */ if ((s = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) { sock_err_message ("socket"); return INVALID_SOCKET; } /* * Set up the socket */ if (connect (s, (struct sockaddr *) &server, sizeof server) < 0) { sock_err_message ("connect"); return INVALID_SOCKET; } setsockopt (s, SOL_SOCKET, SO_LINGER, (char *) &l_arg, sizeof l_arg); /* * Send the authentication */ auth_string[AUTH_KEY_LENGTH] = '\0'; send_to_emacs (s, "-auth "); send_to_emacs (s, auth_string); send_to_emacs (s, " "); return s; } /* Returns 1 if PREFIX is a prefix of STRING. */ static int strprefix (char *prefix, char *string) { return !strncmp (prefix, string, strlen (prefix)); } #if !defined (NO_SOCKETS_IN_FILE_SYSTEM) /* Three possibilities: 2 - can't be `stat'ed (sets errno) 1 - isn't owned by us 0 - success: none of the above */ static int socket_status (socket_name) char *socket_name; { struct stat statbfr; if (stat (socket_name, &statbfr) == -1) return 2; if (statbfr.st_uid != geteuid ()) return 1; return 0; } /* A signal handler that passes the signal to the Emacs process. Useful for SIGWINCH. */ SIGTYPE pass_signal_to_emacs (int signalnum) { int old_errno = errno; if (emacs_pid) kill (emacs_pid, signalnum); signal (signalnum, pass_signal_to_emacs); errno = old_errno; } /* Signal handler for SIGCONT; notify the Emacs process that it can now resume our tty frame. */ SIGTYPE handle_sigcont (int signalnum) { int old_errno = errno; if (tcgetpgrp (1) == getpgrp ()) { /* We are in the foreground. */ send_to_emacs (emacs_socket, "-resume \n"); } else { /* We are in the background; cancel the continue. */ kill (getpid (), SIGSTOP); } signal (signalnum, handle_sigcont); errno = old_errno; } /* Signal handler for SIGTSTP; notify the Emacs process that we are going to sleep. Normally the suspend is initiated by Emacs via server-handle-suspend-tty, but if the server gets out of sync with reality, we may get a SIGTSTP on C-z. Handling this signal and notifying Emacs about it should get things under control again. */ SIGTYPE handle_sigtstp (int signalnum) { int old_errno = errno; sigset_t set; if (emacs_socket) send_to_emacs (emacs_socket, "-suspend \n"); /* Unblock this signal and call the default handler by temporarily changing the handler and resignalling. */ sigprocmask (SIG_BLOCK, NULL, &set); sigdelset (&set, signalnum); signal (signalnum, SIG_DFL); kill (getpid (), signalnum); sigprocmask (SIG_SETMASK, &set, NULL); /* Let's the above signal through. */ signal (signalnum, handle_sigtstp); errno = old_errno; } /* Set up signal handlers before opening a frame on the current tty. */ void init_signals (void) { /* Set up signal handlers. */ signal (SIGWINCH, pass_signal_to_emacs); /* Don't pass SIGINT and SIGQUIT to Emacs, because it has no way of deciding which terminal the signal came from. C-g is now a normal input event on secondary terminals. */ #if 0 signal (SIGINT, pass_signal_to_emacs); signal (SIGQUIT, pass_signal_to_emacs); #endif signal (SIGCONT, handle_sigcont); signal (SIGTSTP, handle_sigtstp); signal (SIGTTOU, handle_sigtstp); } HSOCKET set_local_socket () { HSOCKET s; struct sockaddr_un server; /* * Open up an AF_UNIX socket in this person's home directory */ if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0) { message (TRUE, "%s: socket: %s\n", progname, strerror (errno)); return INVALID_SOCKET; } server.sun_family = AF_UNIX; { int sock_status = 0; int default_sock = !socket_name; int saved_errno = 0; char *server_name = "server"; if (socket_name && !index (socket_name, '/') && !index (socket_name, '\\')) { /* socket_name is a file name component. */ server_name = socket_name; socket_name = NULL; default_sock = 1; /* Try both UIDs. */ } if (default_sock) { socket_name = alloca (100 + strlen (server_name)); sprintf (socket_name, "/tmp/emacs%d/%s", (int) geteuid (), server_name); } if (strlen (socket_name) < sizeof (server.sun_path)) strcpy (server.sun_path, socket_name); else { message (TRUE, "%s: socket-name %s too long\n", progname, socket_name); fail (); } /* See if the socket exists, and if it's owned by us. */ sock_status = socket_status (server.sun_path); saved_errno = errno; if (sock_status && default_sock) { /* Failing that, see if LOGNAME or USER exist and differ from our euid. If so, look for a socket based on the UID associated with the name. This is reminiscent of the logic that init_editfns uses to set the global Vuser_full_name. */ char *user_name = (char *) egetenv ("LOGNAME"); if (!user_name) user_name = (char *) egetenv ("USER"); if (user_name) { struct passwd *pw = getpwnam (user_name); if (pw && (pw->pw_uid != geteuid ())) { /* We're running under su, apparently. */ socket_name = alloca (100 + strlen (server_name)); sprintf (socket_name, "/tmp/emacs%d/%s", (int) pw->pw_uid, server_name); if (strlen (socket_name) < sizeof (server.sun_path)) strcpy (server.sun_path, socket_name); else { message (TRUE, "%s: socket-name %s too long\n", progname, socket_name); exit (EXIT_FAILURE); } sock_status = socket_status (server.sun_path); saved_errno = errno; } else errno = saved_errno; } } switch (sock_status) { case 1: /* There's a socket, but it isn't owned by us. This is OK if we are root. */ if (0 != geteuid ()) { message (TRUE, "%s: Invalid socket owner\n", progname); return INVALID_SOCKET; } break; case 2: /* `stat' failed */ if (saved_errno == ENOENT) message (TRUE, "%s: can't find socket; have you started the server?\n\ To start the server in Emacs, type \"M-x server-start\".\n", progname); else message (TRUE, "%s: can't stat %s: %s\n", progname, server.sun_path, strerror (saved_errno)); return INVALID_SOCKET; } } if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2) < 0) { message (TRUE, "%s: connect: %s\n", progname, strerror (errno)); return INVALID_SOCKET; } return s; } #endif /* ! NO_SOCKETS_IN_FILE_SYSTEM */ HSOCKET set_socket () { HSOCKET s; INITIALIZE (); #ifndef NO_SOCKETS_IN_FILE_SYSTEM /* Explicit --socket-name argument. */ if (socket_name) { s = set_local_socket (); if ((s != INVALID_SOCKET) || alternate_editor) return s; message (TRUE, "%s: error accessing socket \"%s\"\n", progname, socket_name); exit (EXIT_FAILURE); } #endif /* Explicit --server-file arg or EMACS_SERVER_FILE variable. */ if (!server_file) server_file = egetenv ("EMACS_SERVER_FILE"); if (server_file) { s = set_tcp_socket (); if ((s != INVALID_SOCKET) || alternate_editor) return s; message (TRUE, "%s: error accessing server file \"%s\"\n", progname, server_file); exit (EXIT_FAILURE); } #ifndef NO_SOCKETS_IN_FILE_SYSTEM /* Implicit local socket. */ s = set_local_socket (); if (s != INVALID_SOCKET) return s; #endif /* Implicit server file. */ server_file = "server"; s = set_tcp_socket (); if ((s != INVALID_SOCKET) || alternate_editor) return s; /* No implicit or explicit socket, and no alternate editor. */ message (TRUE, "%s: No socket or alternate editor. Please use:\n\n" #ifndef NO_SOCKETS_IN_FILE_SYSTEM "\t--socket-name\n" #endif "\t--server-file (or environment variable EMACS_SERVER_FILE)\n\ \t--alternate-editor (or environment variable ALTERNATE_EDITOR)\n", progname); exit (EXIT_FAILURE); } #ifdef WINDOWSNT FARPROC set_fg; /* Pointer to AllowSetForegroundWindow. */ FARPROC get_wc; /* Pointer to RealGetWindowClassA. */ BOOL CALLBACK w32_find_emacs_process (hWnd, lParam) HWND hWnd; LPARAM lParam; { DWORD pid; char class[6]; /* Reject any window not of class "Emacs". */ if (! get_wc (hWnd, class, sizeof (class)) || strcmp (class, "Emacs")) return TRUE; /* We only need the process id, not the thread id. */ (void) GetWindowThreadProcessId (hWnd, &pid); /* Not the one we're looking for. */ if (pid != (DWORD) emacs_pid) return TRUE; /* OK, let's raise it. */ set_fg (emacs_pid); /* Stop enumeration. */ return FALSE; } /* * Search for a window of class "Emacs" and owned by a process with * process id = emacs_pid. If found, allow it to grab the focus. */ void w32_give_focus () { HMODULE hUser32; /* It shouldn't happen when dealing with TCP sockets. */ if (!emacs_pid) return; if (!(hUser32 = LoadLibrary ("user32.dll"))) return; /* Modern Windows restrict which processes can set the foreground window. emacsclient can allow Emacs to grab the focus by calling the function AllowSetForegroundWindow. Unfortunately, older Windows (W95, W98 and NT) lack this function, so we have to check its availability. */ if ((set_fg = GetProcAddress (hUser32, "AllowSetForegroundWindow")) && (get_wc = GetProcAddress (hUser32, "RealGetWindowClassA"))) EnumWindows (w32_find_emacs_process, (LPARAM) 0); FreeLibrary (hUser32); } #endif int main (argc, argv) int argc; char **argv; { int i, rl, needlf = 0; char *cwd, *str; char string[BUFSIZ+1]; main_argv = argv; progname = argv[0]; /* Process options. */ decode_options (argc, argv); if ((argc - optind < 1) && !eval && !tty && !window_system) { message (TRUE, "%s: file name or argument required\n" "Try `%s --help' for more information\n", progname, progname); exit (EXIT_FAILURE); } if ((emacs_socket = set_socket ()) == INVALID_SOCKET) fail (); cwd = get_current_dir_name (); if (cwd == 0) { /* getwd puts message in STRING if it fails. */ message (TRUE, "%s: %s\n", progname, "Cannot get current working directory"); fail (); } #ifdef WINDOWSNT w32_give_focus (); #endif /* Send over our environment. */ if (!current_frame) { extern char **environ; int i; for (i = 0; environ[i]; i++) { char *name = xstrdup (environ[i]); char *value = strchr (name, '='); send_to_emacs (emacs_socket, "-env "); quote_argument (emacs_socket, environ[i]); send_to_emacs (emacs_socket, " "); } } /* Send over our current directory. */ if (!current_frame) { send_to_emacs (emacs_socket, "-dir "); quote_argument (emacs_socket, cwd); send_to_emacs (emacs_socket, "/"); send_to_emacs (emacs_socket, " "); } retry: if (nowait) send_to_emacs (emacs_socket, "-nowait "); if (current_frame) send_to_emacs (emacs_socket, "-current-frame "); if (display) { send_to_emacs (emacs_socket, "-display "); quote_argument (emacs_socket, display); send_to_emacs (emacs_socket, " "); } if (tty) { char *type = egetenv ("TERM"); char *tty_name = NULL; #ifndef WINDOWSNT tty_name = ttyname (fileno (stdin)); #endif if (! tty_name) { message (TRUE, "%s: could not get terminal name\n", progname); fail (); } if (! type) { message (TRUE, "%s: please set the TERM variable to your terminal type\n", progname); fail (); } if (! strcmp (type, "eterm")) { /* This causes nasty, MULTI_KBOARD-related input lockouts. */ message (TRUE, "%s: opening a frame in an Emacs term buffer" " is not supported\n", progname); fail (); } #if !defined (NO_SOCKETS_IN_FILE_SYSTEM) init_signals (); #endif send_to_emacs (emacs_socket, "-tty "); quote_argument (emacs_socket, tty_name); send_to_emacs (emacs_socket, " "); quote_argument (emacs_socket, type); send_to_emacs (emacs_socket, " "); } if (window_system) send_to_emacs (emacs_socket, "-window-system "); if ((argc - optind > 0)) { for (i = optind; i < argc; i++) { int relative = 0; if (eval) { /* Don't prepend cwd or anything like that. */ send_to_emacs (emacs_socket, "-eval "); quote_argument (emacs_socket, argv[i]); send_to_emacs (emacs_socket, " "); continue; } if (*argv[i] == '+') { char *p = argv[i] + 1; while (isdigit ((unsigned char) *p) || *p == ':') p++; if (*p == 0) { send_to_emacs (emacs_socket, "-position "); quote_argument (emacs_socket, argv[i]); send_to_emacs (emacs_socket, " "); continue; } else relative = 1; } else if (! file_name_absolute_p (argv[i])) #ifndef WINDOWSNT relative = 1; #else /* Call GetFullPathName so filenames of the form X:Y, where X is a valid drive designator, are interpreted as drive:path, not file:stream, and treated as absolute. The user can still pass a file:stream if desired (for example, .\X:Y), but it is not very useful, as Emacs currently does a very bad job of dealing wih NTFS streams. */ { char *filename = (char *) xmalloc (MAX_PATH); DWORD size; size = GetFullPathName (argv[i], MAX_PATH, filename, NULL); if (size > 0 && size < MAX_PATH) argv[i] = filename; else { relative = 1; free (filename); } } #endif send_to_emacs (emacs_socket, "-file "); if (relative) { quote_argument (emacs_socket, cwd); send_to_emacs (emacs_socket, "/"); } quote_argument (emacs_socket, argv[i]); send_to_emacs (emacs_socket, " "); } } else { if (!tty && !window_system) { while ((str = fgets (string, BUFSIZ, stdin))) { if (eval) send_to_emacs (emacs_socket, "-eval "); else send_to_emacs (emacs_socket, "-file "); quote_argument (emacs_socket, str); } send_to_emacs (emacs_socket, " "); } } send_to_emacs (emacs_socket, "\n"); /* Wait for an answer. */ if (!eval && !tty && !nowait) { printf ("Waiting for Emacs..."); needlf = 2; } fflush (stdout); fsync (1); /* Now, wait for an answer and print any messages. */ while ((rl = recv (emacs_socket, string, BUFSIZ, 0)) > 0) { char *p; string[rl] = '\0'; p = string + strlen (string) - 1; while (p > string && *p == '\n') *p-- = 0; if (strprefix ("-emacs-pid ", string)) { /* -emacs-pid PID: The process id of the Emacs process. */ emacs_pid = strtol (string + strlen ("-emacs-pid"), NULL, 10); } else if (strprefix ("-window-system-unsupported ", string)) { /* -window-system-unsupported: Emacs was compiled without X support. Try again on the terminal. */ window_system = 0; nowait = 0; tty = 1; goto retry; } else if (strprefix ("-print ", string)) { /* -print STRING: Print STRING on the terminal. */ str = unquote_argument (string + strlen ("-print ")); if (needlf) printf ("\n"); printf ("%s", str); needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n'; } else if (strprefix ("-error ", string)) { /* -error DESCRIPTION: Signal an error on the terminal. */ str = unquote_argument (string + strlen ("-error ")); if (needlf) printf ("\n"); fprintf (stderr, "*ERROR*: %s", str); needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n'; } #ifdef SIGSTOP else if (strprefix ("-suspend ", string)) { /* -suspend: Suspend this terminal, i.e., stop the process. */ if (needlf) printf ("\n"); needlf = 0; kill (0, SIGSTOP); } #endif else { /* Unknown command. */ if (needlf) printf ("\n"); printf ("*ERROR*: Unknown message: %s", string); needlf = string[0] == '\0' ? needlf : string[strlen (string) - 1] != '\n'; } } if (needlf) printf ("\n"); fflush (stdout); fsync (1); CLOSE_SOCKET (emacs_socket); return EXIT_SUCCESS; } #endif /* HAVE_SOCKETS && HAVE_INET_SOCKETS */ #ifndef HAVE_STRERROR char * strerror (errnum) int errnum; { extern char *sys_errlist[]; extern int sys_nerr; if (errnum >= 0 && errnum < sys_nerr) return sys_errlist[errnum]; return (char *) "Unknown error"; } #endif /* ! HAVE_STRERROR */ /* arch-tag: f39bb9c4-73eb-477e-896d-50832e2ca9a7 (do not change this comment) */ /* emacsclient.c ends here */