lib-src/emacsclient.c

   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 Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2, or (at your option)
  10 any later version.
  11
  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.
  16
  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.  */
  21
  22
  23 #define NO_SHORTNAMES
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include <config.h>
  27 #endif
  28
  29 #ifdef WINDOWSNT
  30
  31 /* config.h defines these, which disables sockets altogether! */
  32 # undef _WINSOCKAPI_
  33 # undef _WINSOCK_H
  34
  35 # include <malloc.h>
  36 # include <stdlib.h>
  37 # include <windows.h>
  38
  39 # define NO_SOCKETS_IN_FILE_SYSTEM
  40
  41 # define HSOCKET SOCKET
  42 # define CLOSE_SOCKET closesocket
  43 # define INITIALIZE() (initialize_sockets ())
  44
  45 #else /* !WINDOWSNT */
  46
  47 # include <sys/types.h>
  48
  49 # ifdef HAVE_INET_SOCKETS
  50 #  include <netinet/in.h>
  51 # endif
  52
  53 # define INVALID_SOCKET -1
  54 # define HSOCKET int
  55 # define CLOSE_SOCKET close
  56 # define INITIALIZE()
  57
  58 #endif /* !WINDOWSNT */
  59
  60 #undef signal
  61
  62 #include <stdarg.h>
  63 #include <ctype.h>
  64 #include <stdio.h>
  65 #include "getopt.h"
  66 #ifdef HAVE_UNISTD_H
  67 #include <unistd.h>
  68 #endif
  69
  70 #ifdef VMS
  71 # include "vms-pwd.h"
  72 #else /* not VMS */
  73 #ifdef WINDOWSNT
  74 # include <io.h>
  75 #else /* not WINDOWSNT */
  76 # include <pwd.h>
  77 #endif /* not WINDOWSNT */
  78 #endif /* not VMS */
  79
  80 char *getenv (), *getwd ();
  81 char *(getcwd) ();
  82
  83 #ifndef VERSION
  84 #define VERSION "unspecified"
  85 #endif
  86 \f
  87 #define SEND_STRING(data) (send_to_emacs (s, (data)))
  88 #define SEND_QUOTED(data) (quote_file_name (s, (data)))
  89
  90 #ifndef EXIT_SUCCESS
  91 #define EXIT_SUCCESS 0
  92 #endif
  93
  94 #ifndef EXIT_FAILURE
  95 #define EXIT_FAILURE 1
  96 #endif
  97
  98 #ifndef FALSE
  99 #define FALSE 0
 100 #endif
 101
 102 #ifndef TRUE
 103 #define TRUE 1
 104 #endif
 105
 106 #ifndef NO_RETURN
 107 #define NO_RETURN
 108 #endif
 109 \f
 110 /* Name used to invoke this program.  */
 111 char *progname;
 112
 113 /* Nonzero means don't wait for a response from Emacs.  --no-wait.  */
 114 int nowait = 0;
 115
 116 /* Nonzero means args are expressions to be evaluated.  --eval.  */
 117 int eval = 0;
 118
 119 /* The display on which Emacs should work.  --display.  */
 120 char *display = NULL;
 121
 122 /* If non-NULL, the name of an editor to fallback to if the server
 123    is not running.  --alternate-editor.   */
 124 const char *alternate_editor = NULL;
 125
 126 /* If non-NULL, the filename of the UNIX socket.  */
 127 char *socket_name = NULL;
 128
 129 /* If non-NULL, the filename of the authentication file.  */
 130 char *server_file = NULL;
 131
 132 void print_help_and_exit () NO_RETURN;
 133
 134 struct option longopts[] =
 135 {
 136   { "no-wait",  no_argument,       NULL, 'n' },
 137   { "eval",     no_argument,       NULL, 'e' },
 138   { "help",     no_argument,       NULL, 'H' },
 139   { "version",  no_argument,       NULL, 'V' },
 140   { "alternate-editor", required_argument, NULL, 'a' },
 141 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
 142   { "socket-name",      required_argument, NULL, 's' },
 143 #endif
 144   { "server-file",      required_argument, NULL, 'f' },
 145   { "display",  required_argument, NULL, 'd' },
 146   { 0, 0, 0, 0 }
 147 };
 148
 149 /* Message functions. */
 150
 151 #ifdef WINDOWSNT
 152 /* I first tried to check for STDOUT.  The check did not work,
 153    I get a valid handle also in nonconsole apps.
 154    Instead I test for console title, which seems to work.  */
 155 int
 156 w32_window_app()
 157 {
 158   static int window_app = -1;
 159   char szTitle[MAX_PATH];
 160
 161   if (window_app < 0)
 162     window_app = (GetConsoleTitleA (szTitle, MAX_PATH) == 0);
 163
 164   return window_app;
 165 }
 166 #endif
 167
 168 void
 169 message (int is_error, char *message, ...)
 170 {
 171   char buf [2048];
 172   char *msg = buf;
 173   va_list args;
 174
 175   va_start (args, message);
 176
 177   if (is_error)
 178     {
 179       sprintf (buf, "%s: ", progname);
 180       msg = strchr (buf, '\0');
 181     }
 182
 183   vsprintf (msg, message, args);
 184   va_end (args);
 185
 186 #ifdef WINDOWSNT
 187   if (w32_window_app ())
 188     {
 189       if (is_error)
 190         MessageBox (NULL, msg, "Emacsclient ERROR", MB_ICONERROR);
 191       else
 192         MessageBox (NULL, msg, "Emacsclient", MB_ICONINFORMATION);
 193     }
 194   else
 195 #endif
 196     fprintf (is_error ? stderr : stdout, msg);
 197 }
 198
 199 /* Decode the options from argv and argc.
 200    The global variable `optind' will say how many arguments we used up.  */
 201
 202 void
 203 decode_options (argc, argv)
 204      int argc;
 205      char **argv;
 206 {
 207   alternate_editor = getenv ("ALTERNATE_EDITOR");
 208
 209   while (1)
 210     {
 211       int opt = getopt_long (argc, argv,
 212 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
 213                              "VHnea:s:f:d:",
 214 #else
 215                              "VHnea:f:d:",
 216 #endif
 217                              longopts, 0);
 218
 219       if (opt == EOF)
 220         break;
 221
 222       switch (opt)
 223         {
 224         case 0:
 225           /* If getopt returns 0, then it has already processed a
 226              long-named option.  We should do nothing.  */
 227           break;
 228
 229         case 'a':
 230           alternate_editor = optarg;
 231           break;
 232
 233 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
 234         case 's':
 235           socket_name = optarg;
 236           break;
 237 #endif
 238
 239         case 'f':
 240           server_file = optarg;
 241           break;
 242
 243         case 'd':
 244           display = optarg;
 245           break;
 246
 247         case 'n':
 248           nowait = 1;
 249           break;
 250
 251         case 'e':
 252           eval = 1;
 253           break;
 254
 255         case 'V':
 256           message (FALSE, "emacsclient %s\n", VERSION);
 257           exit (EXIT_SUCCESS);
 258           break;
 259
 260         case 'H':
 261           print_help_and_exit ();
 262           break;
 263
 264         default:
 265           message (TRUE, "Try `%s --help' for more information\n", progname);
 266           exit (EXIT_FAILURE);
 267           break;
 268         }
 269     }
 270 }
 271
 272 void
 273 print_help_and_exit ()
 274 {
 275   message (FALSE,
 276           "Usage: %s [OPTIONS] FILE...\n\
 277 Tell the Emacs server to visit the specified files.\n\
 278 Every FILE can be either just a FILENAME or [+LINE[:COLUMN]] FILENAME.\n\
 279 \n\
 280 The following OPTIONS are accepted:\n\
 281 \n\
 282 -V, --version           Just print version info and return\n\
 283 -H, --help              Print this usage information message\n\
 284 -e, --eval              Evaluate FILE arguments as Lisp expressions\n\
 285 -n, --no-wait           Don't wait for the server to return\n\
 286 -d, --display=DISPLAY   Visit the file in the given display\n"
 287 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
 288 "-s, --socket-name=FILENAME\n\
 289                         Set filename of the UNIX socket for communication\n"
 290 #endif
 291 "-f, --server-file=FILENAME\n\
 292                         Set filename of the TCP authentication file\n\
 293 -a, --alternate-editor=EDITOR\n\
 294                         Editor to fallback to if server is not running\n\
 295 \n\
 296 Report bugs to bug-gnu-emacs@gnu.org.\n", progname);
 297   exit (EXIT_SUCCESS);
 298 }
 299
 300 \f
 301 /*
 302   Try to run a different command, or --if no alternate editor is
 303   defined-- exit with an errorcode.
 304 */
 305 void
 306 fail (argc, argv)
 307      int argc;
 308      char **argv;
 309 {
 310   if (alternate_editor)
 311     {
 312       int i = optind - 1;
 313 #ifdef WINDOWSNT
 314       argv[i] = (char *)alternate_editor;
 315 #endif
 316       execvp (alternate_editor, argv + i);
 317       message (TRUE, "%s: error executing alternate editor \"%s\"\n",
 318                progname, alternate_editor);
 319     }
 320   exit (EXIT_FAILURE);
 321 }
 322
 323 \f
 324 #if !defined (HAVE_SOCKETS) || !defined (HAVE_INET_SOCKETS)
 325
 326 int
 327 main (argc, argv)
 328      int argc;
 329      char **argv;
 330 {
 331   message (TRUE, "%s: Sorry, the Emacs server is supported only\non systems with Berkely sockets.\n",
 332            argv[0]);
 333
 334   fail (argc, argv);
 335 }
 336
 337 #else /* HAVE_SOCKETS && HAVE_INET_SOCKETS */
 338
 339 #ifdef WINDOWSNT
 340 # include <winsock2.h>
 341 #else
 342 # include <sys/types.h>
 343 # include <sys/socket.h>
 344 # include <sys/un.h>
 345 # include <sys/stat.h>
 346 # include <errno.h>
 347 #endif
 348
 349 #define AUTH_KEY_LENGTH      64
 350 #define SEND_BUFFER_SIZE   4096
 351
 352 extern char *strerror ();
 353 extern int errno;
 354
 355 /* Buffer to accumulate data to send in TCP connections.  */
 356 char send_buffer[SEND_BUFFER_SIZE + 1];
 357 int sblen = 0;  /* Fill pointer for the send buffer.  */
 358
 359 /* Let's send the data to Emacs when either
 360    - the data ends in "\n", or
 361    - the buffer is full (but this shouldn't happen)
 362    Otherwise, we just accumulate it.  */
 363 void
 364 send_to_emacs (s, data)
 365      HSOCKET s;
 366      char *data;
 367 {
 368   while (data)
 369     {
 370       int dlen = strlen (data);
 371       if (dlen + sblen >= SEND_BUFFER_SIZE)
 372         {
 373           int part = SEND_BUFFER_SIZE - sblen;
 374           strncpy (&send_buffer[sblen], data, part);
 375           data += part;
 376           sblen = SEND_BUFFER_SIZE;
 377         }
 378       else if (dlen)
 379         {
 380           strcpy (&send_buffer[sblen], data);
 381           data = NULL;
 382           sblen += dlen;
 383         }
 384       else
 385         break;
 386
 387       if (sblen == SEND_BUFFER_SIZE
 388           || (sblen > 0 && send_buffer[sblen-1] == '\n'))
 389         {
 390           int sent = send (s, send_buffer, sblen, 0);
 391           if (sent != sblen)
 392             strcpy (send_buffer, &send_buffer[sent]);
 393           sblen -= sent;
 394         }
 395     }
 396 }
 397
 398 /* In NAME, insert a & before each &, each space, each newline, and
 399    any initial -.  Change spaces to underscores, too, so that the
 400    return value never contains a space.  */
 401 void
 402 quote_file_name (s, name)
 403      HSOCKET s;
 404      char *name;
 405 {
 406   char *copy = (char *) malloc (strlen (name) * 2 + 1);
 407   char *p, *q;
 408
 409   p = name;
 410   q = copy;
 411   while (*p)
 412     {
 413       if (*p == ' ')
 414         {
 415           *q++ = '&';
 416           *q++ = '_';
 417           p++;
 418         }
 419       else if (*p == '\n')
 420         {
 421           *q++ = '&';
 422           *q++ = 'n';
 423           p++;
 424         }
 425       else
 426         {
 427           if (*p == '&' || (*p == '-' && p == name))
 428             *q++ = '&';
 429           *q++ = *p++;
 430         }
 431     }
 432   *q++ = 0;
 433
 434   SEND_STRING (copy);
 435
 436   free (copy);
 437 }
 438
 439 int
 440 file_name_absolute_p (filename)
 441      const unsigned char *filename;
 442 {
 443   /* Sanity check, it shouldn't happen.  */
 444   if (! filename) return FALSE;
 445
 446   /* /xxx is always an absolute path.  */
 447   if (filename[0] == '/') return TRUE;
 448
 449   /* Empty filenames (which shouldn't happen) are relative.  */
 450   if (filename[0] == '\0') return FALSE;
 451
 452 #ifdef WINDOWSNT
 453   /* X:\xxx is always absolute; X:xxx is an error and will fail.  */
 454   if (isalpha (filename[0])
 455       && filename[1] == ':' && (filename[2] == '\\' || filename[2] == '/'))
 456     return TRUE;
 457
 458   /* Both \xxx and \\xxx\yyy are absolute.  */
 459   if (filename[0] == '\\') return TRUE;
 460 #endif
 461
 462   return FALSE;
 463 }
 464
 465 #ifdef WINDOWSNT
 466 /* Wrapper to make WSACleanup a cdecl, as required by atexit().  */
 467 void
 468 __cdecl close_winsock ()
 469 {
 470   WSACleanup ();
 471 }
 472
 473 /* Initialize the WinSock2 library.  */
 474 void
 475 initialize_sockets ()
 476 {
 477   WSADATA wsaData;
 478
 479   if (WSAStartup (MAKEWORD (2, 0), &wsaData))
 480     {
 481       message (TRUE, "%s: error initializing WinSock2", progname);
 482       exit (EXIT_FAILURE);
 483     }
 484
 485   atexit (close_winsock);
 486 }
 487 #endif /* WINDOWSNT */
 488 \f
 489 /*
 490  * Read the information needed to set up a TCP comm channel with
 491  * the Emacs server: host, port, pid and authentication string.
 492 */
 493 int
 494 get_server_config (server, authentication)
 495      struct sockaddr_in *server;
 496      char *authentication;
 497 {
 498   char dotted[32];
 499   char *port;
 500   char *pid;
 501   FILE *config = NULL;
 502
 503   if (file_name_absolute_p (server_file))
 504     config = fopen (server_file, "rb");
 505   else
 506     {
 507       char *home = getenv ("HOME");
 508
 509       if (home)
 510         {
 511           char *path = alloca (32 + strlen (home) + strlen (server_file));
 512           sprintf (path, "%s/.emacs.d/server/%s", home, server_file);
 513           config = fopen (path, "rb");
 514         }
 515 #ifdef WINDOWSNT
 516       if (!config && (home = getenv ("APPDATA")))
 517         {
 518           char *path = alloca (32 + strlen (home) + strlen (server_file));
 519           sprintf (path, "%s/.emacs.d/server/%s", home, server_file);
 520           config = fopen (path, "rb");
 521         }
 522 #endif
 523     }
 524
 525   if (! config)
 526     return FALSE;
 527
 528   if (fgets (dotted, sizeof dotted, config)
 529       && (port = strchr (dotted, ':'))
 530       && (pid = strchr (port, ' ')))
 531     {
 532       *port++ = '\0';
 533       *pid++  = '\0';
 534     }
 535   else
 536     {
 537       message (TRUE, "%s: invalid configuration info", progname);
 538       exit (EXIT_FAILURE);
 539     }
 540
 541   server->sin_family = AF_INET;
 542   server->sin_addr.s_addr = inet_addr (dotted);
 543   server->sin_port = htons (atoi (port));
 544
 545   if (! fread (authentication, AUTH_KEY_LENGTH, 1, config))
 546     {
 547       message (TRUE, "%s: cannot read authentication info", progname);
 548       exit (EXIT_FAILURE);
 549     }
 550
 551   fclose (config);
 552
 553 #ifdef WINDOWSNT
 554   /*
 555     Modern Windows restrict which processes can set the foreground window.
 556     So, for emacsclient to be able to force Emacs into the foreground, we
 557     have to call AllowSetForegroundWindow().  Unfortunately, older Windows
 558     (W95, W98 and NT) don't have this function, so we have to check first.
 559
 560     We're doing this here because it has to be done before sending info
 561     to Emacs, and otherwise we'll need a global variable just to pass around
 562     the pid, which is also inelegant.
 563    */
 564   {
 565     HMODULE hUser32;
 566
 567     if (hUser32 = LoadLibrary ("user32.dll"))
 568       {
 569         FARPROC set_fg;
 570         if (set_fg = GetProcAddress (hUser32, "AllowSetForegroundWindow"))
 571           set_fg (atoi (pid));
 572         FreeLibrary (hUser32);
 573       }
 574   }
 575 #endif
 576
 577   return TRUE;
 578 }
 579
 580 HSOCKET
 581 set_tcp_socket ()
 582 {
 583   HSOCKET s;
 584   struct sockaddr_in server;
 585   struct linger l_arg = {1, 1};
 586   char auth_string[AUTH_KEY_LENGTH + 1];
 587
 588   if (! get_server_config (&server, auth_string))
 589     return INVALID_SOCKET;
 590
 591   if (server.sin_addr.s_addr != inet_addr ("127.0.0.1"))
 592     message (TRUE, "%s: connected to remote socket at %s\n",
 593              progname, inet_ntoa (server.sin_addr));
 594
 595   /*
 596    * Open up an AF_INET socket
 597    */
 598   if ((s = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
 599     {
 600       message (TRUE, "%s: socket: %s\n", progname, strerror (errno));
 601       return INVALID_SOCKET;
 602     }
 603
 604   /*
 605    * Set up the socket
 606    */
 607   if (connect (s, (struct sockaddr *) &server, sizeof server) < 0)
 608     {
 609       message (TRUE, "%s: connect: %s\n", progname, strerror (errno));
 610       return INVALID_SOCKET;
 611     }
 612
 613   setsockopt (s, SOL_SOCKET, SO_LINGER, (char *) &l_arg, sizeof l_arg);
 614
 615   /*
 616    * Send the authentication
 617    */
 618   auth_string[AUTH_KEY_LENGTH] = '\0';
 619
 620   SEND_STRING ("-auth ");
 621   SEND_STRING (auth_string);
 622   SEND_STRING ("\n");
 623
 624   return s;
 625 }
 626
 627 #if !defined (NO_SOCKETS_IN_FILE_SYSTEM)
 628
 629 /* Three possibilities:
 630    2 - can't be `stat'ed                (sets errno)
 631    1 - isn't owned by us
 632    0 - success: none of the above */
 633
 634 static int
 635 socket_status (socket_name)
 636      char *socket_name;
 637 {
 638   struct stat statbfr;
 639
 640   if (stat (socket_name, &statbfr) == -1)
 641     return 2;
 642
 643   if (statbfr.st_uid != geteuid ())
 644     return 1;
 645
 646   return 0;
 647 }
 648
 649 HSOCKET
 650 set_local_socket ()
 651 {
 652   HSOCKET s;
 653   struct sockaddr_un server;
 654
 655   /*
 656    * Open up an AF_UNIX socket in this person's home directory
 657    */
 658
 659   if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
 660     {
 661       message (TRUE, "%s: socket: %s\n", progname, strerror (errno));
 662       return INVALID_SOCKET;
 663     }
 664
 665   server.sun_family = AF_UNIX;
 666
 667   {
 668     int sock_status = 0;
 669     int default_sock = !socket_name;
 670     int saved_errno;
 671     char *server_name = "server";
 672
 673     if (socket_name && !index (socket_name, '/') && !index (socket_name, '\\'))
 674       { /* socket_name is a file name component.  */
 675         server_name = socket_name;
 676         socket_name = NULL;
 677         default_sock = 1;       /* Try both UIDs.  */
 678       }
 679
 680     if (default_sock)
 681       {
 682         socket_name = alloca (100 + strlen (server_name));
 683         sprintf (socket_name, "/tmp/emacs%d/%s",
 684                  (int) geteuid (), server_name);
 685       }
 686
 687     if (strlen (socket_name) < sizeof (server.sun_path))
 688       strcpy (server.sun_path, socket_name);
 689     else
 690       {
 691         message (TRUE, "%s: socket-name %s too long",
 692                  progname, socket_name);
 693         exit (EXIT_FAILURE);
 694       }
 695
 696     /* See if the socket exists, and if it's owned by us. */
 697     sock_status = socket_status (server.sun_path);
 698     saved_errno = errno;
 699     if (sock_status && default_sock)
 700       {
 701         /* Failing that, see if LOGNAME or USER exist and differ from
 702            our euid.  If so, look for a socket based on the UID
 703            associated with the name.  This is reminiscent of the logic
 704            that init_editfns uses to set the global Vuser_full_name.  */
 705
 706         char *user_name = (char *) getenv ("LOGNAME");
 707
 708         if (!user_name)
 709           user_name = (char *) getenv ("USER");
 710
 711         if (user_name)
 712           {
 713             struct passwd *pw = getpwnam (user_name);
 714
 715             if (pw && (pw->pw_uid != geteuid ()))
 716               {
 717                 /* We're running under su, apparently. */
 718                 socket_name = alloca (100 + strlen (server_name));
 719                 sprintf (socket_name, "/tmp/emacs%d/%s",
 720                          (int) pw->pw_uid, server_name);
 721
 722                 if (strlen (socket_name) < sizeof (server.sun_path))
 723                   strcpy (server.sun_path, socket_name);
 724                 else
 725                   {
 726                     message (TRUE, "%s: socket-name %s too long",
 727                              progname, socket_name);
 728                     exit (EXIT_FAILURE);
 729                   }
 730
 731                 sock_status = socket_status (server.sun_path);
 732                 saved_errno = errno;
 733               }
 734             else
 735               errno = saved_errno;
 736           }
 737       }
 738
 739     switch (sock_status)
 740       {
 741       case 1:
 742         /* There's a socket, but it isn't owned by us.  This is OK if
 743            we are root. */
 744         if (0 != geteuid ())
 745           {
 746             message (TRUE, "%s: Invalid socket owner\n", progname);
 747             return INVALID_SOCKET;
 748           }
 749         break;
 750
 751       case 2:
 752         /* `stat' failed */
 753         if (saved_errno == ENOENT)
 754           message (TRUE,
 755                    "%s: can't find socket; have you started the server?\n\
 756 To start the server in Emacs, type \"M-x server-start\".\n",
 757                    progname);
 758         else
 759           message (TRUE, "%s: can't stat %s: %s\n",
 760                    progname, server.sun_path, strerror (saved_errno));
 761         return INVALID_SOCKET;
 762       }
 763   }
 764
 765   if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2)
 766       < 0)
 767     {
 768       message (TRUE, "%s: connect: %s\n", progname, strerror (errno));
 769       return INVALID_SOCKET;
 770     }
 771
 772   return s;
 773 }
 774 #endif /* ! NO_SOCKETS_IN_FILE_SYSTEM */
 775
 776 HSOCKET
 777 set_socket ()
 778 {
 779   HSOCKET s;
 780
 781   INITIALIZE ();
 782
 783 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
 784   /* Explicit --socket-name argument.  */
 785   if (socket_name)
 786     {
 787       s = set_local_socket ();
 788       if ((s != INVALID_SOCKET) || alternate_editor)
 789         return s;
 790
 791       message (TRUE, "%s: error accessing socket \"%s\"",
 792                progname, socket_name);
 793       exit (EXIT_FAILURE);
 794     }
 795 #endif
 796
 797   /* Explicit --server-file arg or EMACS_SERVER_FILE variable.  */
 798   if (!server_file)
 799     server_file = getenv ("EMACS_SERVER_FILE");
 800
 801   if (server_file)
 802     {
 803       s = set_tcp_socket ();
 804       if ((s != INVALID_SOCKET) || alternate_editor)
 805         return s;
 806
 807       message (TRUE, "%s: error accessing server file \"%s\"",
 808                progname, server_file);
 809       exit (EXIT_FAILURE);
 810     }
 811
 812 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
 813   /* Implicit local socket.  */
 814   s = set_local_socket ();
 815   if (s != INVALID_SOCKET)
 816     return s;
 817 #endif
 818
 819   /* Implicit server file.  */
 820   server_file = "server";
 821   s = set_tcp_socket ();
 822   if ((s != INVALID_SOCKET) || alternate_editor)
 823     return s;
 824
 825   /* No implicit or explicit socket, and no alternate editor.  */
 826   message (TRUE, "%s: No socket or alternate editor.  Please use:\n\n"
 827 #ifndef NO_SOCKETS_IN_FILE_SYSTEM
 828 "\t--socket-name\n"
 829 #endif
 830 "\t--server-file      (or environment variable EMACS_SERVER_FILE)\n\
 831 \t--alternate-editor (or environment variable ALTERNATE_EDITOR)\n",
 832            progname);
 833   exit (EXIT_FAILURE);
 834 }
 835
 836 int
 837 main (argc, argv)
 838      int argc;
 839      char **argv;
 840 {
 841   HSOCKET s;
 842   int i, rl, needlf = 0;
 843   char *cwd;
 844   char string[BUFSIZ+1];
 845
 846   progname = argv[0];
 847
 848   /* Process options.  */
 849   decode_options (argc, argv);
 850
 851   if ((argc - optind < 1) && !eval)
 852     {
 853       message (TRUE, "%s: file name or argument required\nTry `%s --help' for more information\n",
 854               progname, progname);
 855       exit (EXIT_FAILURE);
 856     }
 857
 858   if ((s = set_socket ()) == INVALID_SOCKET)
 859     fail (argc, argv);
 860
 861 #ifdef HAVE_GETCWD
 862   cwd = getcwd (string, sizeof string);
 863 #else
 864   cwd = getwd (string);
 865 #endif
 866   if (cwd == 0)
 867     {
 868       /* getwd puts message in STRING if it fails.  */
 869 #ifdef HAVE_GETCWD
 870       message (TRUE, "%s: %s (%s)\n", progname,
 871                "Cannot get current working directory", strerror (errno));
 872 #else
 873       message (TRUE, "%s: %s (%s)\n", progname, string, strerror (errno));
 874 #endif
 875       fail (argc, argv);
 876     }
 877
 878   if (nowait)
 879     SEND_STRING ("-nowait ");
 880
 881   if (eval)
 882     SEND_STRING ("-eval ");
 883
 884   if (display)
 885     {
 886       SEND_STRING ("-display ");
 887       SEND_QUOTED (display);
 888       SEND_STRING (" ");
 889     }
 890
 891   if ((argc - optind > 0))
 892     {
 893       for (i = optind; i < argc; i++)
 894         {
 895           if (eval)
 896             ; /* Don't prepend any cwd or anything like that.  */
 897           else if (*argv[i] == '+')
 898             {
 899               char *p = argv[i] + 1;
 900               while (isdigit ((unsigned char) *p) || *p == ':') p++;
 901               if (*p != 0)
 902                 {
 903                   SEND_QUOTED (cwd);
 904                   SEND_STRING ("/");
 905                 }
 906             }
 907           else if (! file_name_absolute_p (argv[i]))
 908             {
 909               SEND_QUOTED (cwd);
 910               SEND_STRING ("/");
 911             }
 912
 913           SEND_QUOTED (argv[i]);
 914           SEND_STRING (" ");
 915         }
 916     }
 917   else
 918     {
 919       while (fgets (string, BUFSIZ, stdin))
 920         {
 921           SEND_QUOTED (string);
 922         }
 923       SEND_STRING (" ");
 924     }
 925
 926   SEND_STRING ("\n");
 927
 928   /* Maybe wait for an answer.   */
 929   if (!nowait)
 930     {
 931       if (!eval)
 932         {
 933           printf ("Waiting for Emacs...");
 934           needlf = 2;
 935         }
 936       fflush (stdout);
 937
 938       /* Now, wait for an answer and print any messages.  */
 939       while ((rl = recv (s, string, BUFSIZ, 0)) > 0)
 940         {
 941           string[rl] = '\0';
 942           if (needlf == 2)
 943             printf ("\n");
 944           printf ("%s", string);
 945           needlf = string[0] == '\0' ? needlf : string[strlen (string) - 1] != '\n';
 946         }
 947
 948       if (needlf)
 949         printf ("\n");
 950       fflush (stdout);
 951     }
 952
 953   CLOSE_SOCKET (s);
 954   return EXIT_SUCCESS;
 955 }
 956
 957 #endif /* HAVE_SOCKETS && HAVE_INET_SOCKETS */
 958
 959 #ifndef HAVE_STRERROR
 960 char *
 961 strerror (errnum)
 962      int errnum;
 963 {
 964   extern char *sys_errlist[];
 965   extern int sys_nerr;
 966
 967   if (errnum >= 0 && errnum < sys_nerr)
 968     return sys_errlist[errnum];
 969   return (char *) "Unknown error";
 970 }
 971
 972 #endif /* ! HAVE_STRERROR */
 973
 974 /* arch-tag: f39bb9c4-73eb-477e-896d-50832e2ca9a7
 975    (do not change this comment) */
 976
 977 /* emacsclient.c ends here */