X-Git-Url: http://git.hcoop.net/bpt/emacs.git/blobdiff_plain/defb80d7adcb5ea918dec614f0044fdc6967e4a2..71b8f73572849e0a3f40ea37e2f2587e660a4ddc:/lib-src/emacsclient.c diff --git a/lib-src/emacsclient.c b/lib-src/emacsclient.c dissimilarity index 73% index 76d0b4e54d..ea1e6cd7af 100644 --- a/lib-src/emacsclient.c +++ b/lib-src/emacsclient.c @@ -1,329 +1,1082 @@ -/* Client process that communicates with GNU Emacs acting as server. - Copyright (C) 1986, 1987, 1994 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 2, 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; see the file COPYING. If not, write to -the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ - - -#define NO_SHORTNAMES -#include <../src/config.h> -#undef read -#undef write -#undef open -#undef close -#undef signal - - -#if !defined(HAVE_SOCKETS) && !defined(HAVE_SYSVIPC) -#include - -main (argc, argv) - int argc; - char **argv; -{ - fprintf (stderr, "%s: Sorry, the Emacs server is supported only\n", - argv[0]); - fprintf (stderr, "on systems with Berkeley sockets or System V IPC.\n"); - exit (1); -} - -#else /* HAVE_SOCKETS or HAVE_SYSVIPC */ - -#if ! defined (HAVE_SYSVIPC) -/* BSD code is very different from SYSV IPC code */ - -#include -#include -#include -#include -#include -#include - -extern char *strerror (); -extern int errno; - -main (argc, argv) - int argc; - char **argv; -{ - char system_name[32]; - int s, i; - FILE *out; - struct sockaddr_un server; - char *homedir, *cwd, *str; - char string[BUFSIZ]; - - char *getenv (), *getwd (); - int geteuid (); - - if (argc < 2) - { - fprintf (stderr, "Usage: %s [+linenumber] filename\n", argv[0]); - exit (1); - } - - /* - * Open up an AF_UNIX socket in this person's home directory - */ - - if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0) - { - fprintf (stderr, "%s: ", argv[0]); - perror ("socket"); - exit (1); - } - server.sun_family = AF_UNIX; -#ifndef SERVER_HOME_DIR - { - struct stat statbfr; - - gethostname (system_name, sizeof (system_name)); - sprintf (server.sun_path, "/tmp/esrv%d-%s", geteuid (), system_name); - - if (stat (server.sun_path, &statbfr) == -1) - { - if (errno == ENOENT) - fprintf (stderr, - "Can't find socket; have you started the server?\n"); - else - perror ("stat"); - exit (1); - } - if (statbfr.st_uid != geteuid()) - { - fprintf (stderr, "Illegal socket owner\n"); - exit (1); - } - } -#else - if ((homedir = getenv ("HOME")) == NULL) - { - fprintf (stderr, "%s: No home directory\n", argv[0]); - exit (1); - } - strcpy (server.sun_path, homedir); - strcat (server.sun_path, "/.emacs_server"); -#endif - - if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2) - < 0) - { - fprintf (stderr, "%s: ", argv[0]); - perror ("connect"); - exit (1); - } - if ((out = fdopen (s, "r+")) == NULL) - { - fprintf (stderr, "%s: ", argv[0]); - perror ("fdopen"); - exit (1); - } - - cwd = getwd (string); - if (cwd == 0) - { - /* getwd puts message in STRING if it fails. */ - fprintf (stderr, "%s: %s (%s)\n", argv[0], string, strerror (errno)); - exit (1); - } - - for (i = 1; i < argc; i++) - { - if (*argv[i] == '+') - { - char *p = argv[i] + 1; - while (*p >= '0' && *p <= '9') p++; - if (*p != 0) - fprintf (out, "%s/", cwd); - } - else if (*argv[i] != '/') - fprintf (out, "%s/", cwd); - fprintf (out, "%s ", argv[i]); - } - fprintf (out, "\n"); - fflush (out); - - printf ("Waiting for Emacs..."); - fflush (stdout); - - rewind (out); /* re-read the output */ - str = fgets (string, BUFSIZ, out); - - /* Now, wait for an answer and print any messages. */ - - while (str = fgets (string, BUFSIZ, out)) - printf ("%s", str); - - exit (0); -} - -#else /* This is the SYSV IPC section */ - -#include -#include -#include -#include - -char *getwd (), *getcwd (), *getenv (); - -main (argc, argv) - int argc; - char **argv; -{ - int s; - key_t key; - /* Size of text allocated in MSGP. */ - int size_allocated = BUFSIZ; - /* Amount of text used in MSGP. */ - int used; - struct msgbuf *msgp - = (struct msgbuf *) malloc (sizeof (struct msgbuf) + size_allocated); - struct msqid_ds * msg_st; - char *homedir, buf[BUFSIZ]; - char gwdirb[BUFSIZ]; - char *cwd; - char *temp; - char *progname = argv[0]; - - if (argc < 2) - { - fprintf (stderr, "Usage: %s [+linenumber] filename\n", argv[0]); - exit (1); - } - - /* - * Create a message queue using ~/.emacs_server as the path for ftok - */ - if ((homedir = getenv ("HOME")) == NULL) - { - fprintf (stderr, "%s: No home directory\n", argv[0]); - exit (1); - } - strcpy (buf, homedir); - strcat (buf, "/.emacs_server"); - creat (buf, 0600); - key = ftok (buf, 1); /* unlikely to be anyone else using it */ - s = msgget (key, 0600 | IPC_CREAT); - if (s == -1) - { - fprintf (stderr, "%s: ", argv[0]); - perror ("msgget"); - exit (1); - } - - /* Determine working dir, so we can prefix it to all the arguments. */ -#ifdef BSD - temp = getwd (gwdirb); -#else - temp = getcwd (gwdirb, sizeof gwdirb); -#endif - - cwd = gwdirb; - if (temp != 0) - { - /* On some systems, cwd can look like `@machine/...'; - ignore everything before the first slash in such a case. */ - while (*cwd && *cwd != '/') - cwd++; - strcat (cwd, "/"); - } - else - { - fprintf (stderr, cwd); - exit (1); - } - - msgp->mtext[0] = 0; - used = 0; - argc--; argv++; - while (argc) - { - int need_cwd = 0; - char *modified_arg = argv[0]; - if (*modified_arg == '+') - { - char *p = modified_arg + 1; - while (*p >= '0' && *p <= '9') p++; - if (*p != 0) - need_cwd = 1; - } - else if (*modified_arg != '/') - need_cwd = 1; - - if (need_cwd) - used += strlen (cwd); - used += strlen (modified_arg) + 1; - while (used + 2 > size_allocated) - { - size_allocated *= 2; - msgp = (struct msgbuf *) realloc (msgp, - (sizeof (struct msgbuf) - + size_allocated)); - } - - if (need_cwd) - strcat (msgp->mtext, cwd); - - strcat (msgp->mtext, modified_arg); - strcat (msgp->mtext, " "); - argv++; argc--; - } - strcat (msgp->mtext, "\n"); -#ifdef HPUX /* HPUX has a bug. */ - if (strlen (msgp->mtext) >= 512) - { - fprintf (stderr, "emacsclient: args too long for msgsnd\n"); - exit (1); - } -#endif - msgp->mtype = 1; - if (msgsnd (s, msgp, strlen (msgp->mtext)+1, 0) < 0) - { - fprintf (stderr, "%s: ", progname); - perror ("msgsnd"); - exit (1); - } - /* - * Now, wait for an answer - */ - printf ("Waiting for Emacs..."); - fflush (stdout); - - msgrcv (s, msgp, BUFSIZ, getpid (), 0); /* wait for anything back */ - strcpy (buf, msgp->mtext); - - printf ("\n%s\n", buf); - exit (0); -} - -#endif /* HAVE_SYSVIPC */ - -#endif /* HAVE_SOCKETS or HAVE_SYSVIPC */ - -#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 */ +/* Client process that communicates with GNU Emacs acting as server. + Copyright (C) 1986, 1987, 1994, 1999, 2000, 2001, 2002, 2003, 2004, + 2005, 2006, 2007 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 2, 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; see the file COPYING. If not, write to +the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, +Boston, MA 02110-1301, USA. */ + + +#define NO_SHORTNAMES + +#ifdef HAVE_CONFIG_H +#include +#endif + +#ifdef WINDOWSNT + +/* config.h defines these, which disables sockets altogether! */ +# undef _WINSOCKAPI_ +# undef _WINSOCK_H + +# 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 VMS +# include "vms-pwd.h" +#else /* not VMS */ +#ifdef WINDOWSNT +# include +#else /* not WINDOWSNT */ +# include +#endif /* not WINDOWSNT */ +#endif /* not VMS */ + +char *getenv (), *getwd (); +char *(getcwd) (); + +#ifndef VERSION +#define VERSION "unspecified" +#endif + +#define SEND_STRING(data) (send_to_emacs (s, (data))) +#define SEND_QUOTED(data) (quote_file_name (s, (data))) + +#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; + +/* 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; + +/* The display on which Emacs should work. --display. */ +char *display = NULL; + +/* 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' }, + { "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' }, + { "display", required_argument, NULL, 'd' }, + { 0, 0, 0, 0 } +}; + +/* Message functions. */ + +#ifdef WINDOWSNT +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); + + return window_app; +} +#endif + +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 = getenv ("ALTERNATE_EDITOR"); + + while (1) + { + int opt = getopt_long (argc, argv, +#ifndef NO_SOCKETS_IN_FILE_SYSTEM + "VHnea:s:f:d:", +#else + "VHnea:f:d:", +#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; + + case 'd': + display = optarg; + break; + + case 'n': + nowait = 1; + break; + + case 'e': + eval = 1; + break; + + case 'V': + message (FALSE, "emacsclient %s\n", VERSION); + exit (EXIT_SUCCESS); + break; + + case 'H': + print_help_and_exit (); + break; + + default: + message (TRUE, "Try `%s --help' for more information\n", progname); + exit (EXIT_FAILURE); + break; + } + } +} + +void +print_help_and_exit () +{ + 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\ +\n\ +-V, --version Just print version info and return\n\ +-H, --help Print this usage information message\n\ +-e, --eval Evaluate FILE arguments as Lisp 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 server is not running\n\ +\n\ +Report bugs to bug-gnu-emacs@gnu.org.\n", progname); + exit (EXIT_SUCCESS); +} + + +#ifdef WINDOWSNT + +/* + 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 */ + +/* + Try to run a different command, or --if no alternate editor is + defined-- exit with an errorcode. +*/ +void +fail (argc, argv) + int argc; + char **argv; +{ + if (alternate_editor) + { + int i = optind - 1; + + execvp (alternate_editor, 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; +{ + message (TRUE, "%s: Sorry, the Emacs server is supported only\non systems with Berkely sockets.\n", + argv[0]); + + fail (argc, argv); +} + +#else /* HAVE_SOCKETS && HAVE_INET_SOCKETS */ + +#ifdef WINDOWSNT +# include +#else +# include +# include +# 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. */ + +/* 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 NAME, 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. */ +void +quote_file_name (s, name) + HSOCKET s; + char *name; +{ + char *copy = (char *) malloc (strlen (name) * 2 + 1); + char *p, *q; + + p = name; + q = copy; + while (*p) + { + if (*p == ' ') + { + *q++ = '&'; + *q++ = '_'; + p++; + } + else if (*p == '\n') + { + *q++ = '&'; + *q++ = 'n'; + p++; + } + else + { + if (*p == '&' || (*p == '-' && p == name)) + *q++ = '&'; + *q++ = *p++; + } + } + *q++ = 0; + + SEND_STRING (copy); + + free (copy); +} + +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; + + /* + FIXME: There's a corner case not dealt with, "x:y", where: + + 1) x is a valid drive designation (usually a letter in the A-Z range) + and y is a path, relative to the current directory on drive x. This + is absolute, *after* fixing the y part to include the current + directory in x. + + 2) x is a relative file name, and y is an NTFS stream name. This is a + correct relative path, but it is very unusual. + + The trouble is that first case items are also valid examples of the + second case, i.e., "c:test" can be understood as drive:path or as + file:stream. + + The "right" fix would involve checking whether + - the current drive/partition is NTFS, + - x is a valid (and accesible) drive designator, + - x:y already exists as a file:stream in the current directory, + - y already exists on the current directory of drive x, + - the auspices are favorable, + and then taking an "informed decision" based on the above. + + Whatever the result, Emacs currently does a very bad job of dealing + with NTFS file:streams: it cannot visit them, and the only way to + create one is by setting `buffer-file-name' to point to it (either + manually or with emacsclient). So perhaps resorting to 1) and ignoring + 2) for now is the right thing to do. + + Anyway, something to decide After the Release. + */ +#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", 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 = getenv ("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 = getenv ("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", 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", 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) + { + message (TRUE, "%s: socket: %s\n", progname, strerror (errno)); + return INVALID_SOCKET; + } + + /* + * Set up the socket + */ + if (connect (s, (struct sockaddr *) &server, sizeof server) < 0) + { + message (TRUE, "%s: connect: %s\n", progname, strerror (errno)); + 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_STRING ("-auth "); + SEND_STRING (auth_string); + SEND_STRING ("\n"); + + return s; +} + +#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; +} + +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; + 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", + progname, socket_name); + exit (EXIT_FAILURE); + } + + /* 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 *) getenv ("LOGNAME"); + + if (!user_name) + user_name = (char *) getenv ("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", + 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\"", + progname, socket_name); + exit (EXIT_FAILURE); + } +#endif + + /* Explicit --server-file arg or EMACS_SERVER_FILE variable. */ + if (!server_file) + server_file = getenv ("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\"", + 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; +{ + HSOCKET s; + int i, rl, needlf = 0; + char *cwd; + char string[BUFSIZ+1]; + + progname = argv[0]; + + /* Process options. */ + decode_options (argc, argv); + + if ((argc - optind < 1) && !eval) + { + message (TRUE, "%s: file name or argument required\nTry `%s --help' for more information\n", + progname, progname); + exit (EXIT_FAILURE); + } + + if ((s = set_socket ()) == INVALID_SOCKET) + fail (argc, argv); + +#ifdef HAVE_GETCWD + cwd = getcwd (string, sizeof string); +#else + cwd = getwd (string); +#endif + if (cwd == 0) + { + /* getwd puts message in STRING if it fails. */ + message (TRUE, "%s: %s (%s)\n", progname, +#ifdef HAVE_GETCWD + "Cannot get current working directory", +#else + string, +#endif + strerror (errno)); + fail (argc, argv); + } + +#ifdef WINDOWSNT + w32_give_focus (); +#endif + + if (nowait) + SEND_STRING ("-nowait "); + + if (eval) + SEND_STRING ("-eval "); + + if (display) + { + SEND_STRING ("-display "); + SEND_QUOTED (display); + SEND_STRING (" "); + } + + if ((argc - optind > 0)) + { + for (i = optind; i < argc; i++) + { + if (eval) + ; /* Don't prepend any cwd or anything like that. */ + else if (*argv[i] == '+') + { + char *p = argv[i] + 1; + while (isdigit ((unsigned char) *p) || *p == ':') p++; + if (*p != 0) + { + SEND_QUOTED (cwd); + SEND_STRING ("/"); + } + } + else if (! file_name_absolute_p (argv[i])) + { + SEND_QUOTED (cwd); + SEND_STRING ("/"); + } + + SEND_QUOTED (argv[i]); + SEND_STRING (" "); + } + } + else + { + while (fgets (string, BUFSIZ, stdin)) + { + SEND_QUOTED (string); + } + SEND_STRING (" "); + } + + SEND_STRING ("\n"); + + /* Maybe wait for an answer. */ + if (!nowait) + { + if (!eval) + { + printf ("Waiting for Emacs..."); + needlf = 2; + } + fflush (stdout); + + /* Now, wait for an answer and print any messages. */ + while ((rl = recv (s, string, BUFSIZ, 0)) > 0) + { + string[rl] = '\0'; + if (needlf == 2) + printf ("\n"); + printf ("%s", string); + needlf = string[0] == '\0' ? needlf : string[strlen (string) - 1] != '\n'; + } + + if (needlf) + printf ("\n"); + fflush (stdout); + } + + CLOSE_SOCKET (s); + 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 */