| 1 | /* Client process that communicates with GNU Emacs acting as server. |
| 2 | Copyright (C) 1986, 1987, 1994, 1999, 2000, 2001, 2002, 2003, 2004, |
| 3 | 2005, 2006, 2007, 2008 Free Software Foundation, Inc. |
| 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 3, 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 | # include <commctrl.h> |
| 39 | |
| 40 | # define NO_SOCKETS_IN_FILE_SYSTEM |
| 41 | |
| 42 | # define HSOCKET SOCKET |
| 43 | # define CLOSE_SOCKET closesocket |
| 44 | # define INITIALIZE() (initialize_sockets ()) |
| 45 | |
| 46 | #else /* !WINDOWSNT */ |
| 47 | |
| 48 | # include <sys/types.h> |
| 49 | |
| 50 | # ifdef HAVE_INET_SOCKETS |
| 51 | # include <netinet/in.h> |
| 52 | # endif |
| 53 | |
| 54 | # define INVALID_SOCKET -1 |
| 55 | # define HSOCKET int |
| 56 | # define CLOSE_SOCKET close |
| 57 | # define INITIALIZE() |
| 58 | |
| 59 | #endif /* !WINDOWSNT */ |
| 60 | |
| 61 | #undef signal |
| 62 | |
| 63 | #include <stdarg.h> |
| 64 | #include <ctype.h> |
| 65 | #include <stdio.h> |
| 66 | #include "getopt.h" |
| 67 | #ifdef HAVE_UNISTD_H |
| 68 | #include <unistd.h> |
| 69 | #endif |
| 70 | |
| 71 | #ifdef VMS |
| 72 | # include "vms-pwd.h" |
| 73 | #else /* not VMS */ |
| 74 | #ifdef WINDOWSNT |
| 75 | # include <io.h> |
| 76 | #else /* not WINDOWSNT */ |
| 77 | # include <pwd.h> |
| 78 | #endif /* not WINDOWSNT */ |
| 79 | #endif /* not VMS */ |
| 80 | #include <sys/stat.h> |
| 81 | |
| 82 | #include <signal.h> |
| 83 | #include <errno.h> |
| 84 | |
| 85 | \f |
| 86 | char *getenv (), *getwd (); |
| 87 | char *(getcwd) (); |
| 88 | |
| 89 | #ifdef WINDOWSNT |
| 90 | char *w32_getenv (); |
| 91 | #define egetenv(VAR) w32_getenv(VAR) |
| 92 | #else |
| 93 | #define egetenv(VAR) getenv(VAR) |
| 94 | #endif |
| 95 | |
| 96 | #ifndef VERSION |
| 97 | #define VERSION "unspecified" |
| 98 | #endif |
| 99 | \f |
| 100 | |
| 101 | #ifndef EXIT_SUCCESS |
| 102 | #define EXIT_SUCCESS 0 |
| 103 | #endif |
| 104 | |
| 105 | #ifndef EXIT_FAILURE |
| 106 | #define EXIT_FAILURE 1 |
| 107 | #endif |
| 108 | |
| 109 | #ifndef FALSE |
| 110 | #define FALSE 0 |
| 111 | #endif |
| 112 | |
| 113 | #ifndef TRUE |
| 114 | #define TRUE 1 |
| 115 | #endif |
| 116 | |
| 117 | #ifndef NO_RETURN |
| 118 | #define NO_RETURN |
| 119 | #endif |
| 120 | \f |
| 121 | /* Name used to invoke this program. */ |
| 122 | char *progname; |
| 123 | |
| 124 | /* The second argument to main. */ |
| 125 | char **main_argv; |
| 126 | |
| 127 | /* Nonzero means don't wait for a response from Emacs. --no-wait. */ |
| 128 | int nowait = 0; |
| 129 | |
| 130 | /* Nonzero means args are expressions to be evaluated. --eval. */ |
| 131 | int eval = 0; |
| 132 | |
| 133 | /* Nonzero means don't open a new frame. Inverse of --create-frame. */ |
| 134 | int current_frame = 1; |
| 135 | |
| 136 | /* Nonzero means open a new graphical frame. */ |
| 137 | int window_system = 0; |
| 138 | |
| 139 | /* The display on which Emacs should work. --display. */ |
| 140 | char *display = NULL; |
| 141 | |
| 142 | /* Nonzero means open a new Emacs frame on the current terminal. */ |
| 143 | int tty = 0; |
| 144 | |
| 145 | /* If non-NULL, the name of an editor to fallback to if the server |
| 146 | is not running. --alternate-editor. */ |
| 147 | const char *alternate_editor = NULL; |
| 148 | |
| 149 | /* If non-NULL, the filename of the UNIX socket. */ |
| 150 | char *socket_name = NULL; |
| 151 | |
| 152 | /* If non-NULL, the filename of the authentication file. */ |
| 153 | char *server_file = NULL; |
| 154 | |
| 155 | /* PID of the Emacs server process. */ |
| 156 | int emacs_pid = 0; |
| 157 | |
| 158 | void print_help_and_exit () NO_RETURN; |
| 159 | |
| 160 | struct option longopts[] = |
| 161 | { |
| 162 | { "no-wait", no_argument, NULL, 'n' }, |
| 163 | { "eval", no_argument, NULL, 'e' }, |
| 164 | { "help", no_argument, NULL, 'H' }, |
| 165 | { "version", no_argument, NULL, 'V' }, |
| 166 | { "tty", no_argument, NULL, 't' }, |
| 167 | { "create-frame", no_argument, NULL, 'c' }, |
| 168 | { "alternate-editor", required_argument, NULL, 'a' }, |
| 169 | #ifndef NO_SOCKETS_IN_FILE_SYSTEM |
| 170 | { "socket-name", required_argument, NULL, 's' }, |
| 171 | #endif |
| 172 | { "server-file", required_argument, NULL, 'f' }, |
| 173 | #ifndef WINDOWSNT |
| 174 | { "display", required_argument, NULL, 'd' }, |
| 175 | #endif |
| 176 | { 0, 0, 0, 0 } |
| 177 | }; |
| 178 | |
| 179 | \f |
| 180 | /* Like malloc but get fatal error if memory is exhausted. */ |
| 181 | |
| 182 | long * |
| 183 | xmalloc (size) |
| 184 | unsigned int size; |
| 185 | { |
| 186 | long *result = (long *) malloc (size); |
| 187 | if (result == NULL) |
| 188 | { |
| 189 | perror ("malloc"); |
| 190 | exit (EXIT_FAILURE); |
| 191 | } |
| 192 | return result; |
| 193 | } |
| 194 | |
| 195 | /* Like strdup but get a fatal error if memory is exhausted. */ |
| 196 | |
| 197 | char * |
| 198 | xstrdup (const char *s) |
| 199 | { |
| 200 | char *result = strdup (s); |
| 201 | if (result == NULL) |
| 202 | { |
| 203 | perror ("strdup"); |
| 204 | exit (EXIT_FAILURE); |
| 205 | } |
| 206 | return result; |
| 207 | } |
| 208 | |
| 209 | /* From sysdep.c */ |
| 210 | #if !defined (HAVE_GET_CURRENT_DIR_NAME) || defined (BROKEN_GET_CURRENT_DIR_NAME) |
| 211 | |
| 212 | /* From lisp.h */ |
| 213 | #ifndef DIRECTORY_SEP |
| 214 | #define DIRECTORY_SEP '/' |
| 215 | #endif |
| 216 | #ifndef IS_DIRECTORY_SEP |
| 217 | #define IS_DIRECTORY_SEP(_c_) ((_c_) == DIRECTORY_SEP) |
| 218 | #endif |
| 219 | #ifndef IS_DEVICE_SEP |
| 220 | #ifndef DEVICE_SEP |
| 221 | #define IS_DEVICE_SEP(_c_) 0 |
| 222 | #else |
| 223 | #define IS_DEVICE_SEP(_c_) ((_c_) == DEVICE_SEP) |
| 224 | #endif |
| 225 | #endif |
| 226 | #ifndef IS_ANY_SEP |
| 227 | #define IS_ANY_SEP(_c_) (IS_DIRECTORY_SEP (_c_)) |
| 228 | #endif |
| 229 | |
| 230 | |
| 231 | /* Return the current working directory. Returns NULL on errors. |
| 232 | Any other returned value must be freed with free. This is used |
| 233 | only when get_current_dir_name is not defined on the system. */ |
| 234 | char* |
| 235 | get_current_dir_name () |
| 236 | { |
| 237 | char *buf; |
| 238 | char *pwd; |
| 239 | struct stat dotstat, pwdstat; |
| 240 | /* If PWD is accurate, use it instead of calling getwd. PWD is |
| 241 | sometimes a nicer name, and using it may avoid a fatal error if a |
| 242 | parent directory is searchable but not readable. */ |
| 243 | if ((pwd = egetenv ("PWD")) != 0 |
| 244 | && (IS_DIRECTORY_SEP (*pwd) || (*pwd && IS_DEVICE_SEP (pwd[1]))) |
| 245 | && stat (pwd, &pwdstat) == 0 |
| 246 | && stat (".", &dotstat) == 0 |
| 247 | && dotstat.st_ino == pwdstat.st_ino |
| 248 | && dotstat.st_dev == pwdstat.st_dev |
| 249 | #ifdef MAXPATHLEN |
| 250 | && strlen (pwd) < MAXPATHLEN |
| 251 | #endif |
| 252 | ) |
| 253 | { |
| 254 | buf = (char *) xmalloc (strlen (pwd) + 1); |
| 255 | if (!buf) |
| 256 | return NULL; |
| 257 | strcpy (buf, pwd); |
| 258 | } |
| 259 | #ifdef HAVE_GETCWD |
| 260 | else |
| 261 | { |
| 262 | size_t buf_size = 1024; |
| 263 | buf = (char *) xmalloc (buf_size); |
| 264 | if (!buf) |
| 265 | return NULL; |
| 266 | for (;;) |
| 267 | { |
| 268 | if (getcwd (buf, buf_size) == buf) |
| 269 | break; |
| 270 | if (errno != ERANGE) |
| 271 | { |
| 272 | int tmp_errno = errno; |
| 273 | free (buf); |
| 274 | errno = tmp_errno; |
| 275 | return NULL; |
| 276 | } |
| 277 | buf_size *= 2; |
| 278 | buf = (char *) realloc (buf, buf_size); |
| 279 | if (!buf) |
| 280 | return NULL; |
| 281 | } |
| 282 | } |
| 283 | #else |
| 284 | else |
| 285 | { |
| 286 | /* We need MAXPATHLEN here. */ |
| 287 | buf = (char *) xmalloc (MAXPATHLEN + 1); |
| 288 | if (!buf) |
| 289 | return NULL; |
| 290 | if (getwd (buf) == NULL) |
| 291 | { |
| 292 | int tmp_errno = errno; |
| 293 | free (buf); |
| 294 | errno = tmp_errno; |
| 295 | return NULL; |
| 296 | } |
| 297 | } |
| 298 | #endif |
| 299 | return buf; |
| 300 | } |
| 301 | #endif |
| 302 | |
| 303 | #ifdef WINDOWSNT |
| 304 | |
| 305 | #define REG_ROOT "SOFTWARE\\GNU\\Emacs" |
| 306 | |
| 307 | /* Retrieve an environment variable from the Emacs subkeys of the registry. |
| 308 | Return NULL if the variable was not found, or it was empty. |
| 309 | This code is based on w32_get_resource (w32.c). */ |
| 310 | char * |
| 311 | w32_get_resource (predefined, key, type) |
| 312 | HKEY predefined; |
| 313 | char *key; |
| 314 | LPDWORD type; |
| 315 | { |
| 316 | HKEY hrootkey = NULL; |
| 317 | char *result = NULL; |
| 318 | DWORD cbData; |
| 319 | |
| 320 | if (RegOpenKeyEx (predefined, REG_ROOT, 0, KEY_READ, &hrootkey) == ERROR_SUCCESS) |
| 321 | { |
| 322 | if (RegQueryValueEx (hrootkey, key, NULL, NULL, NULL, &cbData) == ERROR_SUCCESS) |
| 323 | { |
| 324 | result = (char *) xmalloc (cbData); |
| 325 | |
| 326 | if ((RegQueryValueEx (hrootkey, key, NULL, type, result, &cbData) != ERROR_SUCCESS) || |
| 327 | (*result == 0)) |
| 328 | { |
| 329 | free (result); |
| 330 | result = NULL; |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | RegCloseKey (hrootkey); |
| 335 | } |
| 336 | |
| 337 | return result; |
| 338 | } |
| 339 | |
| 340 | /* |
| 341 | getenv wrapper for Windows |
| 342 | |
| 343 | This is needed to duplicate Emacs's behavior, which is to look for enviroment |
| 344 | variables in the registry if they don't appear in the environment. |
| 345 | */ |
| 346 | char * |
| 347 | w32_getenv (envvar) |
| 348 | char *envvar; |
| 349 | { |
| 350 | char *value; |
| 351 | DWORD dwType; |
| 352 | |
| 353 | if (value = getenv (envvar)) |
| 354 | /* Found in the environment. */ |
| 355 | return value; |
| 356 | |
| 357 | if (! (value = w32_get_resource (HKEY_CURRENT_USER, envvar, &dwType)) && |
| 358 | ! (value = w32_get_resource (HKEY_LOCAL_MACHINE, envvar, &dwType))) |
| 359 | /* Not found in the registry. */ |
| 360 | return NULL; |
| 361 | |
| 362 | if (dwType == REG_SZ) |
| 363 | /* Registry; no need to expand. */ |
| 364 | return value; |
| 365 | |
| 366 | if (dwType == REG_EXPAND_SZ) |
| 367 | { |
| 368 | DWORD size; |
| 369 | |
| 370 | if (size = ExpandEnvironmentStrings (value, NULL, 0)) |
| 371 | { |
| 372 | char *buffer = (char *) xmalloc (size); |
| 373 | if (ExpandEnvironmentStrings (value, buffer, size)) |
| 374 | { |
| 375 | /* Found and expanded. */ |
| 376 | free (value); |
| 377 | return buffer; |
| 378 | } |
| 379 | |
| 380 | /* Error expanding. */ |
| 381 | free (buffer); |
| 382 | } |
| 383 | } |
| 384 | |
| 385 | /* Not the right type, or not correctly expanded. */ |
| 386 | free (value); |
| 387 | return NULL; |
| 388 | } |
| 389 | |
| 390 | int |
| 391 | w32_window_app () |
| 392 | { |
| 393 | static int window_app = -1; |
| 394 | char szTitle[MAX_PATH]; |
| 395 | |
| 396 | if (window_app < 0) |
| 397 | { |
| 398 | /* Checking for STDOUT does not work; it's a valid handle also in |
| 399 | nonconsole apps. Testing for the console title seems to work. */ |
| 400 | window_app = (GetConsoleTitleA (szTitle, MAX_PATH) == 0); |
| 401 | if (window_app) |
| 402 | InitCommonControls(); |
| 403 | } |
| 404 | |
| 405 | return window_app; |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | execvp wrapper for Windows. Quotes arguments with embedded spaces. |
| 410 | |
| 411 | This is necessary due to the broken implementation of exec* routines in |
| 412 | the Microsoft libraries: they concatenate the arguments together without |
| 413 | quoting special characters, and pass the result to CreateProcess, with |
| 414 | predictably bad results. By contrast, Posix execvp passes the arguments |
| 415 | directly into the argv array of the child process. |
| 416 | */ |
| 417 | int |
| 418 | w32_execvp (path, argv) |
| 419 | char *path; |
| 420 | char **argv; |
| 421 | { |
| 422 | int i; |
| 423 | |
| 424 | /* Required to allow a .BAT script as alternate editor. */ |
| 425 | argv[0] = (char *) alternate_editor; |
| 426 | |
| 427 | for (i = 0; argv[i]; i++) |
| 428 | if (strchr (argv[i], ' ')) |
| 429 | { |
| 430 | char *quoted = alloca (strlen (argv[i]) + 3); |
| 431 | sprintf (quoted, "\"%s\"", argv[i]); |
| 432 | argv[i] = quoted; |
| 433 | } |
| 434 | |
| 435 | return execvp (path, argv); |
| 436 | } |
| 437 | |
| 438 | #undef execvp |
| 439 | #define execvp w32_execvp |
| 440 | |
| 441 | #endif /* WINDOWSNT */ |
| 442 | |
| 443 | /* Display a normal or error message. |
| 444 | On Windows, use a message box if compiled as a Windows app. */ |
| 445 | void |
| 446 | message (int is_error, char *message, ...) |
| 447 | { |
| 448 | char msg [2048]; |
| 449 | va_list args; |
| 450 | |
| 451 | va_start (args, message); |
| 452 | vsprintf (msg, message, args); |
| 453 | va_end (args); |
| 454 | |
| 455 | #ifdef WINDOWSNT |
| 456 | if (w32_window_app ()) |
| 457 | { |
| 458 | if (is_error) |
| 459 | MessageBox (NULL, msg, "Emacsclient ERROR", MB_ICONERROR); |
| 460 | else |
| 461 | MessageBox (NULL, msg, "Emacsclient", MB_ICONINFORMATION); |
| 462 | } |
| 463 | else |
| 464 | #endif |
| 465 | { |
| 466 | FILE *f = is_error ? stderr : stdout; |
| 467 | |
| 468 | fputs (msg, f); |
| 469 | fflush (f); |
| 470 | } |
| 471 | } |
| 472 | |
| 473 | /* Decode the options from argv and argc. |
| 474 | The global variable `optind' will say how many arguments we used up. */ |
| 475 | |
| 476 | void |
| 477 | decode_options (argc, argv) |
| 478 | int argc; |
| 479 | char **argv; |
| 480 | { |
| 481 | alternate_editor = egetenv ("ALTERNATE_EDITOR"); |
| 482 | #ifndef WINDOWSNT |
| 483 | display = egetenv ("DISPLAY"); |
| 484 | if (display && strlen (display) == 0) |
| 485 | display = NULL; |
| 486 | #endif |
| 487 | |
| 488 | while (1) |
| 489 | { |
| 490 | int opt = getopt_long (argc, argv, |
| 491 | #ifndef NO_SOCKETS_IN_FILE_SYSTEM |
| 492 | "VHnea:s:f:d:tc", |
| 493 | #else |
| 494 | "VHnea:f:d:tc", |
| 495 | #endif |
| 496 | longopts, 0); |
| 497 | |
| 498 | if (opt == EOF) |
| 499 | break; |
| 500 | |
| 501 | switch (opt) |
| 502 | { |
| 503 | case 0: |
| 504 | /* If getopt returns 0, then it has already processed a |
| 505 | long-named option. We should do nothing. */ |
| 506 | break; |
| 507 | |
| 508 | case 'a': |
| 509 | alternate_editor = optarg; |
| 510 | break; |
| 511 | |
| 512 | #ifndef NO_SOCKETS_IN_FILE_SYSTEM |
| 513 | case 's': |
| 514 | socket_name = optarg; |
| 515 | break; |
| 516 | #endif |
| 517 | |
| 518 | case 'f': |
| 519 | server_file = optarg; |
| 520 | break; |
| 521 | |
| 522 | #ifndef WINDOWSNT |
| 523 | case 'd': |
| 524 | display = optarg; |
| 525 | break; |
| 526 | #endif |
| 527 | |
| 528 | case 'n': |
| 529 | nowait = 1; |
| 530 | break; |
| 531 | |
| 532 | case 'e': |
| 533 | eval = 1; |
| 534 | break; |
| 535 | |
| 536 | case 'V': |
| 537 | message (FALSE, "emacsclient %s\n", VERSION); |
| 538 | exit (EXIT_SUCCESS); |
| 539 | break; |
| 540 | |
| 541 | case 't': |
| 542 | tty = 1; |
| 543 | current_frame = 0; |
| 544 | break; |
| 545 | |
| 546 | case 'c': |
| 547 | current_frame = 0; |
| 548 | break; |
| 549 | |
| 550 | case 'H': |
| 551 | print_help_and_exit (); |
| 552 | break; |
| 553 | |
| 554 | default: |
| 555 | message (TRUE, "Try `%s --help' for more information\n", progname); |
| 556 | exit (EXIT_FAILURE); |
| 557 | break; |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | if (!tty && display) |
| 562 | window_system = 1; |
| 563 | #if !defined (WINDOWSNT) && !defined (HAVE_CARBON) |
| 564 | else |
| 565 | tty = 1; |
| 566 | #endif |
| 567 | |
| 568 | /* --no-wait implies --current-frame on ttys when there are file |
| 569 | arguments or expressions given. */ |
| 570 | if (nowait && tty && argc - optind > 0) |
| 571 | current_frame = 1; |
| 572 | |
| 573 | if (current_frame) |
| 574 | { |
| 575 | tty = 0; |
| 576 | window_system = 0; |
| 577 | } |
| 578 | |
| 579 | if (tty) |
| 580 | window_system = 0; |
| 581 | } |
| 582 | |
| 583 | \f |
| 584 | void |
| 585 | print_help_and_exit () |
| 586 | { |
| 587 | /* Spaces and tabs are significant in this message; they're chosen so the |
| 588 | message aligns properly both in a tty and in a Windows message box. |
| 589 | Please try to preserve them; otherwise the output is very hard to read |
| 590 | when using emacsclientw. */ |
| 591 | message (FALSE, |
| 592 | "Usage: %s [OPTIONS] FILE...\n\ |
| 593 | Tell the Emacs server to visit the specified files.\n\ |
| 594 | Every FILE can be either just a FILENAME or [+LINE[:COLUMN]] FILENAME.\n\ |
| 595 | \n\ |
| 596 | The following OPTIONS are accepted:\n\ |
| 597 | -V, --version Just print version info and return\n\ |
| 598 | -H, --help Print this usage information message\n\ |
| 599 | -t, --tty Open a new Emacs frame on the current terminal\n\ |
| 600 | -c, --create-frame Create a new frame instead of trying to\n\ |
| 601 | use the current Emacs frame\n\ |
| 602 | -e, --eval Evaluate the FILE arguments as ELisp expressions\n\ |
| 603 | -n, --no-wait Don't wait for the server to return\n" |
| 604 | #ifndef WINDOWSNT |
| 605 | "-d, --display=DISPLAY Visit the file in the given display\n" |
| 606 | #endif |
| 607 | #ifndef NO_SOCKETS_IN_FILE_SYSTEM |
| 608 | "-s, --socket-name=FILENAME\n\ |
| 609 | Set filename of the UNIX socket for communication\n" |
| 610 | #endif |
| 611 | "-f, --server-file=FILENAME\n\ |
| 612 | Set filename of the TCP authentication file\n\ |
| 613 | -a, --alternate-editor=EDITOR\n\ |
| 614 | Editor to fallback to if the server is not running\n\ |
| 615 | \n\ |
| 616 | Report bugs to bug-gnu-emacs@gnu.org.\n", progname); |
| 617 | exit (EXIT_SUCCESS); |
| 618 | } |
| 619 | |
| 620 | /* |
| 621 | Try to run a different command, or --if no alternate editor is |
| 622 | defined-- exit with an errorcode. |
| 623 | Uses argv, but gets it from the global variable main_argv. |
| 624 | */ |
| 625 | void |
| 626 | fail (void) |
| 627 | { |
| 628 | if (alternate_editor) |
| 629 | { |
| 630 | int i = optind - 1; |
| 631 | |
| 632 | execvp (alternate_editor, main_argv + i); |
| 633 | message (TRUE, "%s: error executing alternate editor \"%s\"\n", |
| 634 | progname, alternate_editor); |
| 635 | } |
| 636 | exit (EXIT_FAILURE); |
| 637 | } |
| 638 | |
| 639 | \f |
| 640 | #if !defined (HAVE_SOCKETS) || !defined (HAVE_INET_SOCKETS) |
| 641 | |
| 642 | int |
| 643 | main (argc, argv) |
| 644 | int argc; |
| 645 | char **argv; |
| 646 | { |
| 647 | main_argv = argv; |
| 648 | progname = argv[0]; |
| 649 | message (TRUE, "%s: Sorry, the Emacs server is supported only\n" |
| 650 | "on systems with Berkeley sockets.\n", |
| 651 | argv[0]); |
| 652 | fail (); |
| 653 | } |
| 654 | |
| 655 | #else /* HAVE_SOCKETS && HAVE_INET_SOCKETS */ |
| 656 | |
| 657 | #ifdef WINDOWSNT |
| 658 | # include <winsock2.h> |
| 659 | #else |
| 660 | # include <sys/types.h> |
| 661 | # include <sys/socket.h> |
| 662 | # include <sys/un.h> |
| 663 | #endif |
| 664 | |
| 665 | #define AUTH_KEY_LENGTH 64 |
| 666 | #define SEND_BUFFER_SIZE 4096 |
| 667 | |
| 668 | extern char *strerror (); |
| 669 | extern int errno; |
| 670 | |
| 671 | /* Buffer to accumulate data to send in TCP connections. */ |
| 672 | char send_buffer[SEND_BUFFER_SIZE + 1]; |
| 673 | int sblen = 0; /* Fill pointer for the send buffer. */ |
| 674 | /* Socket used to communicate with the Emacs server process. */ |
| 675 | HSOCKET emacs_socket = 0; |
| 676 | |
| 677 | /* On Windows, the socket library was historically separate from the standard |
| 678 | C library, so errors are handled differently. */ |
| 679 | void |
| 680 | sock_err_message (function_name) |
| 681 | char *function_name; |
| 682 | { |
| 683 | #ifdef WINDOWSNT |
| 684 | char* msg = NULL; |
| 685 | |
| 686 | FormatMessage (FORMAT_MESSAGE_FROM_SYSTEM |
| 687 | | FORMAT_MESSAGE_ALLOCATE_BUFFER |
| 688 | | FORMAT_MESSAGE_ARGUMENT_ARRAY, |
| 689 | NULL, WSAGetLastError (), 0, (LPTSTR)&msg, 0, NULL); |
| 690 | |
| 691 | message (TRUE, "%s: %s: %s\n", progname, function_name, msg); |
| 692 | |
| 693 | LocalFree (msg); |
| 694 | #else |
| 695 | message (TRUE, "%s: %s: %s\n", progname, function_name, strerror (errno)); |
| 696 | #endif |
| 697 | } |
| 698 | |
| 699 | |
| 700 | /* Let's send the data to Emacs when either |
| 701 | - the data ends in "\n", or |
| 702 | - the buffer is full (but this shouldn't happen) |
| 703 | Otherwise, we just accumulate it. */ |
| 704 | void |
| 705 | send_to_emacs (s, data) |
| 706 | HSOCKET s; |
| 707 | char *data; |
| 708 | { |
| 709 | while (data) |
| 710 | { |
| 711 | int dlen = strlen (data); |
| 712 | if (dlen + sblen >= SEND_BUFFER_SIZE) |
| 713 | { |
| 714 | int part = SEND_BUFFER_SIZE - sblen; |
| 715 | strncpy (&send_buffer[sblen], data, part); |
| 716 | data += part; |
| 717 | sblen = SEND_BUFFER_SIZE; |
| 718 | } |
| 719 | else if (dlen) |
| 720 | { |
| 721 | strcpy (&send_buffer[sblen], data); |
| 722 | data = NULL; |
| 723 | sblen += dlen; |
| 724 | } |
| 725 | else |
| 726 | break; |
| 727 | |
| 728 | if (sblen == SEND_BUFFER_SIZE |
| 729 | || (sblen > 0 && send_buffer[sblen-1] == '\n')) |
| 730 | { |
| 731 | int sent = send (s, send_buffer, sblen, 0); |
| 732 | if (sent != sblen) |
| 733 | strcpy (send_buffer, &send_buffer[sent]); |
| 734 | sblen -= sent; |
| 735 | } |
| 736 | } |
| 737 | } |
| 738 | |
| 739 | \f |
| 740 | /* In STR, insert a & before each &, each space, each newline, and |
| 741 | any initial -. Change spaces to underscores, too, so that the |
| 742 | return value never contains a space. |
| 743 | |
| 744 | Does not change the string. Outputs the result to STREAM. */ |
| 745 | void |
| 746 | quote_argument (s, str) |
| 747 | HSOCKET s; |
| 748 | char *str; |
| 749 | { |
| 750 | char *copy = (char *) xmalloc (strlen (str) * 2 + 1); |
| 751 | char *p, *q; |
| 752 | |
| 753 | p = str; |
| 754 | q = copy; |
| 755 | while (*p) |
| 756 | { |
| 757 | if (*p == ' ') |
| 758 | { |
| 759 | *q++ = '&'; |
| 760 | *q++ = '_'; |
| 761 | p++; |
| 762 | } |
| 763 | else if (*p == '\n') |
| 764 | { |
| 765 | *q++ = '&'; |
| 766 | *q++ = 'n'; |
| 767 | p++; |
| 768 | } |
| 769 | else |
| 770 | { |
| 771 | if (*p == '&' || (*p == '-' && p == str)) |
| 772 | *q++ = '&'; |
| 773 | *q++ = *p++; |
| 774 | } |
| 775 | } |
| 776 | *q++ = 0; |
| 777 | |
| 778 | send_to_emacs (s, copy); |
| 779 | |
| 780 | free (copy); |
| 781 | } |
| 782 | |
| 783 | |
| 784 | /* The inverse of quote_argument. Removes quoting in string STR by |
| 785 | modifying the string in place. Returns STR. */ |
| 786 | |
| 787 | char * |
| 788 | unquote_argument (str) |
| 789 | char *str; |
| 790 | { |
| 791 | char *p, *q; |
| 792 | |
| 793 | if (! str) |
| 794 | return str; |
| 795 | |
| 796 | p = str; |
| 797 | q = str; |
| 798 | while (*p) |
| 799 | { |
| 800 | if (*p == '&') |
| 801 | { |
| 802 | p++; |
| 803 | if (*p == '&') |
| 804 | *p = '&'; |
| 805 | else if (*p == '_') |
| 806 | *p = ' '; |
| 807 | else if (*p == 'n') |
| 808 | *p = '\n'; |
| 809 | else if (*p == '-') |
| 810 | *p = '-'; |
| 811 | } |
| 812 | *q++ = *p++; |
| 813 | } |
| 814 | *q = 0; |
| 815 | return str; |
| 816 | } |
| 817 | |
| 818 | \f |
| 819 | int |
| 820 | file_name_absolute_p (filename) |
| 821 | const unsigned char *filename; |
| 822 | { |
| 823 | /* Sanity check, it shouldn't happen. */ |
| 824 | if (! filename) return FALSE; |
| 825 | |
| 826 | /* /xxx is always an absolute path. */ |
| 827 | if (filename[0] == '/') return TRUE; |
| 828 | |
| 829 | /* Empty filenames (which shouldn't happen) are relative. */ |
| 830 | if (filename[0] == '\0') return FALSE; |
| 831 | |
| 832 | #ifdef WINDOWSNT |
| 833 | /* X:\xxx is always absolute. */ |
| 834 | if (isalpha (filename[0]) |
| 835 | && filename[1] == ':' && (filename[2] == '\\' || filename[2] == '/')) |
| 836 | return TRUE; |
| 837 | |
| 838 | /* Both \xxx and \\xxx\yyy are absolute. */ |
| 839 | if (filename[0] == '\\') return TRUE; |
| 840 | |
| 841 | /* |
| 842 | FIXME: There's a corner case not dealt with, "x:y", where: |
| 843 | |
| 844 | 1) x is a valid drive designation (usually a letter in the A-Z range) |
| 845 | and y is a path, relative to the current directory on drive x. This |
| 846 | is absolute, *after* fixing the y part to include the current |
| 847 | directory in x. |
| 848 | |
| 849 | 2) x is a relative file name, and y is an NTFS stream name. This is a |
| 850 | correct relative path, but it is very unusual. |
| 851 | |
| 852 | The trouble is that first case items are also valid examples of the |
| 853 | second case, i.e., "c:test" can be understood as drive:path or as |
| 854 | file:stream. |
| 855 | |
| 856 | The "right" fix would involve checking whether |
| 857 | - the current drive/partition is NTFS, |
| 858 | - x is a valid (and accesible) drive designator, |
| 859 | - x:y already exists as a file:stream in the current directory, |
| 860 | - y already exists on the current directory of drive x, |
| 861 | - the auspices are favorable, |
| 862 | and then taking an "informed decision" based on the above. |
| 863 | |
| 864 | Whatever the result, Emacs currently does a very bad job of dealing |
| 865 | with NTFS file:streams: it cannot visit them, and the only way to |
| 866 | create one is by setting `buffer-file-name' to point to it (either |
| 867 | manually or with emacsclient). So perhaps resorting to 1) and ignoring |
| 868 | 2) for now is the right thing to do. |
| 869 | |
| 870 | Anyway, something to decide After the Release. |
| 871 | */ |
| 872 | #endif |
| 873 | |
| 874 | return FALSE; |
| 875 | } |
| 876 | |
| 877 | #ifdef WINDOWSNT |
| 878 | /* Wrapper to make WSACleanup a cdecl, as required by atexit. */ |
| 879 | void |
| 880 | __cdecl close_winsock () |
| 881 | { |
| 882 | WSACleanup (); |
| 883 | } |
| 884 | |
| 885 | /* Initialize the WinSock2 library. */ |
| 886 | void |
| 887 | initialize_sockets () |
| 888 | { |
| 889 | WSADATA wsaData; |
| 890 | |
| 891 | if (WSAStartup (MAKEWORD (2, 0), &wsaData)) |
| 892 | { |
| 893 | message (TRUE, "%s: error initializing WinSock2\n", progname); |
| 894 | exit (EXIT_FAILURE); |
| 895 | } |
| 896 | |
| 897 | atexit (close_winsock); |
| 898 | } |
| 899 | #endif /* WINDOWSNT */ |
| 900 | |
| 901 | \f |
| 902 | /* |
| 903 | * Read the information needed to set up a TCP comm channel with |
| 904 | * the Emacs server: host, port, pid and authentication string. |
| 905 | */ |
| 906 | int |
| 907 | get_server_config (server, authentication) |
| 908 | struct sockaddr_in *server; |
| 909 | char *authentication; |
| 910 | { |
| 911 | char dotted[32]; |
| 912 | char *port; |
| 913 | char *pid; |
| 914 | FILE *config = NULL; |
| 915 | |
| 916 | if (file_name_absolute_p (server_file)) |
| 917 | config = fopen (server_file, "rb"); |
| 918 | else |
| 919 | { |
| 920 | char *home = egetenv ("HOME"); |
| 921 | |
| 922 | if (home) |
| 923 | { |
| 924 | char *path = alloca (32 + strlen (home) + strlen (server_file)); |
| 925 | sprintf (path, "%s/.emacs.d/server/%s", home, server_file); |
| 926 | config = fopen (path, "rb"); |
| 927 | } |
| 928 | #ifdef WINDOWSNT |
| 929 | if (!config && (home = egetenv ("APPDATA"))) |
| 930 | { |
| 931 | char *path = alloca (32 + strlen (home) + strlen (server_file)); |
| 932 | sprintf (path, "%s/.emacs.d/server/%s", home, server_file); |
| 933 | config = fopen (path, "rb"); |
| 934 | } |
| 935 | #endif |
| 936 | } |
| 937 | |
| 938 | if (! config) |
| 939 | return FALSE; |
| 940 | |
| 941 | if (fgets (dotted, sizeof dotted, config) |
| 942 | && (port = strchr (dotted, ':')) |
| 943 | && (pid = strchr (port, ' '))) |
| 944 | { |
| 945 | *port++ = '\0'; |
| 946 | *pid++ = '\0'; |
| 947 | } |
| 948 | else |
| 949 | { |
| 950 | message (TRUE, "%s: invalid configuration info\n", progname); |
| 951 | exit (EXIT_FAILURE); |
| 952 | } |
| 953 | |
| 954 | server->sin_family = AF_INET; |
| 955 | server->sin_addr.s_addr = inet_addr (dotted); |
| 956 | server->sin_port = htons (atoi (port)); |
| 957 | |
| 958 | if (! fread (authentication, AUTH_KEY_LENGTH, 1, config)) |
| 959 | { |
| 960 | message (TRUE, "%s: cannot read authentication info\n", progname); |
| 961 | exit (EXIT_FAILURE); |
| 962 | } |
| 963 | |
| 964 | fclose (config); |
| 965 | |
| 966 | emacs_pid = atoi (pid); |
| 967 | |
| 968 | return TRUE; |
| 969 | } |
| 970 | |
| 971 | HSOCKET |
| 972 | set_tcp_socket () |
| 973 | { |
| 974 | HSOCKET s; |
| 975 | struct sockaddr_in server; |
| 976 | struct linger l_arg = {1, 1}; |
| 977 | char auth_string[AUTH_KEY_LENGTH + 1]; |
| 978 | |
| 979 | if (! get_server_config (&server, auth_string)) |
| 980 | return INVALID_SOCKET; |
| 981 | |
| 982 | if (server.sin_addr.s_addr != inet_addr ("127.0.0.1")) |
| 983 | message (FALSE, "%s: connected to remote socket at %s\n", |
| 984 | progname, inet_ntoa (server.sin_addr)); |
| 985 | |
| 986 | /* |
| 987 | * Open up an AF_INET socket |
| 988 | */ |
| 989 | if ((s = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) |
| 990 | { |
| 991 | sock_err_message ("socket"); |
| 992 | return INVALID_SOCKET; |
| 993 | } |
| 994 | |
| 995 | /* |
| 996 | * Set up the socket |
| 997 | */ |
| 998 | if (connect (s, (struct sockaddr *) &server, sizeof server) < 0) |
| 999 | { |
| 1000 | sock_err_message ("connect"); |
| 1001 | return INVALID_SOCKET; |
| 1002 | } |
| 1003 | |
| 1004 | setsockopt (s, SOL_SOCKET, SO_LINGER, (char *) &l_arg, sizeof l_arg); |
| 1005 | |
| 1006 | /* |
| 1007 | * Send the authentication |
| 1008 | */ |
| 1009 | auth_string[AUTH_KEY_LENGTH] = '\0'; |
| 1010 | |
| 1011 | send_to_emacs (s, "-auth "); |
| 1012 | send_to_emacs (s, auth_string); |
| 1013 | send_to_emacs (s, "\n"); |
| 1014 | |
| 1015 | return s; |
| 1016 | } |
| 1017 | |
| 1018 | |
| 1019 | /* Returns 1 if PREFIX is a prefix of STRING. */ |
| 1020 | static int |
| 1021 | strprefix (char *prefix, char *string) |
| 1022 | { |
| 1023 | return !strncmp (prefix, string, strlen (prefix)); |
| 1024 | } |
| 1025 | |
| 1026 | |
| 1027 | #if !defined (NO_SOCKETS_IN_FILE_SYSTEM) |
| 1028 | |
| 1029 | /* Three possibilities: |
| 1030 | 2 - can't be `stat'ed (sets errno) |
| 1031 | 1 - isn't owned by us |
| 1032 | 0 - success: none of the above */ |
| 1033 | |
| 1034 | static int |
| 1035 | socket_status (socket_name) |
| 1036 | char *socket_name; |
| 1037 | { |
| 1038 | struct stat statbfr; |
| 1039 | |
| 1040 | if (stat (socket_name, &statbfr) == -1) |
| 1041 | return 2; |
| 1042 | |
| 1043 | if (statbfr.st_uid != geteuid ()) |
| 1044 | return 1; |
| 1045 | |
| 1046 | return 0; |
| 1047 | } |
| 1048 | |
| 1049 | \f |
| 1050 | /* A signal handler that passes the signal to the Emacs process. |
| 1051 | Useful for SIGWINCH. */ |
| 1052 | |
| 1053 | SIGTYPE |
| 1054 | pass_signal_to_emacs (int signalnum) |
| 1055 | { |
| 1056 | int old_errno = errno; |
| 1057 | |
| 1058 | if (emacs_pid) |
| 1059 | kill (emacs_pid, signalnum); |
| 1060 | |
| 1061 | signal (signalnum, pass_signal_to_emacs); |
| 1062 | errno = old_errno; |
| 1063 | } |
| 1064 | |
| 1065 | /* Signal handler for SIGCONT; notify the Emacs process that it can |
| 1066 | now resume our tty frame. */ |
| 1067 | |
| 1068 | SIGTYPE |
| 1069 | handle_sigcont (int signalnum) |
| 1070 | { |
| 1071 | int old_errno = errno; |
| 1072 | |
| 1073 | if (tcgetpgrp (1) == getpgrp ()) |
| 1074 | { |
| 1075 | /* We are in the foreground. */ |
| 1076 | send_to_emacs (emacs_socket, "-resume \n"); |
| 1077 | } |
| 1078 | else |
| 1079 | { |
| 1080 | /* We are in the background; cancel the continue. */ |
| 1081 | kill (getpid (), SIGSTOP); |
| 1082 | } |
| 1083 | |
| 1084 | signal (signalnum, handle_sigcont); |
| 1085 | errno = old_errno; |
| 1086 | } |
| 1087 | |
| 1088 | /* Signal handler for SIGTSTP; notify the Emacs process that we are |
| 1089 | going to sleep. Normally the suspend is initiated by Emacs via |
| 1090 | server-handle-suspend-tty, but if the server gets out of sync with |
| 1091 | reality, we may get a SIGTSTP on C-z. Handling this signal and |
| 1092 | notifying Emacs about it should get things under control again. */ |
| 1093 | |
| 1094 | SIGTYPE |
| 1095 | handle_sigtstp (int signalnum) |
| 1096 | { |
| 1097 | int old_errno = errno; |
| 1098 | sigset_t set; |
| 1099 | |
| 1100 | if (emacs_socket) |
| 1101 | send_to_emacs (emacs_socket, "-suspend \n"); |
| 1102 | |
| 1103 | /* Unblock this signal and call the default handler by temprarily |
| 1104 | changing the handler and resignalling. */ |
| 1105 | sigprocmask (SIG_BLOCK, NULL, &set); |
| 1106 | sigdelset (&set, signalnum); |
| 1107 | signal (signalnum, SIG_DFL); |
| 1108 | kill (getpid (), signalnum); |
| 1109 | sigprocmask (SIG_SETMASK, &set, NULL); /* Let's the above signal through. */ |
| 1110 | signal (signalnum, handle_sigtstp); |
| 1111 | |
| 1112 | errno = old_errno; |
| 1113 | } |
| 1114 | /* Set up signal handlers before opening a frame on the current tty. */ |
| 1115 | |
| 1116 | void |
| 1117 | init_signals (void) |
| 1118 | { |
| 1119 | /* Set up signal handlers. */ |
| 1120 | signal (SIGWINCH, pass_signal_to_emacs); |
| 1121 | |
| 1122 | /* Don't pass SIGINT and SIGQUIT to Emacs, because it has no way of |
| 1123 | deciding which terminal the signal came from. C-g is now a |
| 1124 | normal input event on secondary terminals. */ |
| 1125 | #if 0 |
| 1126 | signal (SIGINT, pass_signal_to_emacs); |
| 1127 | signal (SIGQUIT, pass_signal_to_emacs); |
| 1128 | #endif |
| 1129 | |
| 1130 | signal (SIGCONT, handle_sigcont); |
| 1131 | signal (SIGTSTP, handle_sigtstp); |
| 1132 | signal (SIGTTOU, handle_sigtstp); |
| 1133 | } |
| 1134 | |
| 1135 | |
| 1136 | HSOCKET |
| 1137 | set_local_socket () |
| 1138 | { |
| 1139 | HSOCKET s; |
| 1140 | struct sockaddr_un server; |
| 1141 | |
| 1142 | /* |
| 1143 | * Open up an AF_UNIX socket in this person's home directory |
| 1144 | */ |
| 1145 | |
| 1146 | if ((s = socket (AF_UNIX, SOCK_STREAM, 0)) < 0) |
| 1147 | { |
| 1148 | message (TRUE, "%s: socket: %s\n", progname, strerror (errno)); |
| 1149 | return INVALID_SOCKET; |
| 1150 | } |
| 1151 | |
| 1152 | server.sun_family = AF_UNIX; |
| 1153 | |
| 1154 | { |
| 1155 | int sock_status = 0; |
| 1156 | int default_sock = !socket_name; |
| 1157 | int saved_errno = 0; |
| 1158 | char *server_name = "server"; |
| 1159 | |
| 1160 | if (socket_name && !index (socket_name, '/') && !index (socket_name, '\\')) |
| 1161 | { /* socket_name is a file name component. */ |
| 1162 | server_name = socket_name; |
| 1163 | socket_name = NULL; |
| 1164 | default_sock = 1; /* Try both UIDs. */ |
| 1165 | } |
| 1166 | |
| 1167 | if (default_sock) |
| 1168 | { |
| 1169 | socket_name = alloca (100 + strlen (server_name)); |
| 1170 | sprintf (socket_name, "/tmp/emacs%d/%s", |
| 1171 | (int) geteuid (), server_name); |
| 1172 | } |
| 1173 | |
| 1174 | if (strlen (socket_name) < sizeof (server.sun_path)) |
| 1175 | strcpy (server.sun_path, socket_name); |
| 1176 | else |
| 1177 | { |
| 1178 | message (TRUE, "%s: socket-name %s too long\n", |
| 1179 | progname, socket_name); |
| 1180 | fail (); |
| 1181 | } |
| 1182 | |
| 1183 | /* See if the socket exists, and if it's owned by us. */ |
| 1184 | sock_status = socket_status (server.sun_path); |
| 1185 | saved_errno = errno; |
| 1186 | if (sock_status && default_sock) |
| 1187 | { |
| 1188 | /* Failing that, see if LOGNAME or USER exist and differ from |
| 1189 | our euid. If so, look for a socket based on the UID |
| 1190 | associated with the name. This is reminiscent of the logic |
| 1191 | that init_editfns uses to set the global Vuser_full_name. */ |
| 1192 | |
| 1193 | char *user_name = (char *) egetenv ("LOGNAME"); |
| 1194 | |
| 1195 | if (!user_name) |
| 1196 | user_name = (char *) egetenv ("USER"); |
| 1197 | |
| 1198 | if (user_name) |
| 1199 | { |
| 1200 | struct passwd *pw = getpwnam (user_name); |
| 1201 | |
| 1202 | if (pw && (pw->pw_uid != geteuid ())) |
| 1203 | { |
| 1204 | /* We're running under su, apparently. */ |
| 1205 | socket_name = alloca (100 + strlen (server_name)); |
| 1206 | sprintf (socket_name, "/tmp/emacs%d/%s", |
| 1207 | (int) pw->pw_uid, server_name); |
| 1208 | |
| 1209 | if (strlen (socket_name) < sizeof (server.sun_path)) |
| 1210 | strcpy (server.sun_path, socket_name); |
| 1211 | else |
| 1212 | { |
| 1213 | message (TRUE, "%s: socket-name %s too long\n", |
| 1214 | progname, socket_name); |
| 1215 | exit (EXIT_FAILURE); |
| 1216 | } |
| 1217 | |
| 1218 | sock_status = socket_status (server.sun_path); |
| 1219 | saved_errno = errno; |
| 1220 | } |
| 1221 | else |
| 1222 | errno = saved_errno; |
| 1223 | } |
| 1224 | } |
| 1225 | |
| 1226 | switch (sock_status) |
| 1227 | { |
| 1228 | case 1: |
| 1229 | /* There's a socket, but it isn't owned by us. This is OK if |
| 1230 | we are root. */ |
| 1231 | if (0 != geteuid ()) |
| 1232 | { |
| 1233 | message (TRUE, "%s: Invalid socket owner\n", progname); |
| 1234 | return INVALID_SOCKET; |
| 1235 | } |
| 1236 | break; |
| 1237 | |
| 1238 | case 2: |
| 1239 | /* `stat' failed */ |
| 1240 | if (saved_errno == ENOENT) |
| 1241 | message (TRUE, |
| 1242 | "%s: can't find socket; have you started the server?\n\ |
| 1243 | To start the server in Emacs, type \"M-x server-start\".\n", |
| 1244 | progname); |
| 1245 | else |
| 1246 | message (TRUE, "%s: can't stat %s: %s\n", |
| 1247 | progname, server.sun_path, strerror (saved_errno)); |
| 1248 | return INVALID_SOCKET; |
| 1249 | } |
| 1250 | } |
| 1251 | |
| 1252 | if (connect (s, (struct sockaddr *) &server, strlen (server.sun_path) + 2) |
| 1253 | < 0) |
| 1254 | { |
| 1255 | message (TRUE, "%s: connect: %s\n", progname, strerror (errno)); |
| 1256 | return INVALID_SOCKET; |
| 1257 | } |
| 1258 | |
| 1259 | return s; |
| 1260 | } |
| 1261 | #endif /* ! NO_SOCKETS_IN_FILE_SYSTEM */ |
| 1262 | |
| 1263 | HSOCKET |
| 1264 | set_socket () |
| 1265 | { |
| 1266 | HSOCKET s; |
| 1267 | |
| 1268 | INITIALIZE (); |
| 1269 | |
| 1270 | #ifndef NO_SOCKETS_IN_FILE_SYSTEM |
| 1271 | /* Explicit --socket-name argument. */ |
| 1272 | if (socket_name) |
| 1273 | { |
| 1274 | s = set_local_socket (); |
| 1275 | if ((s != INVALID_SOCKET) || alternate_editor) |
| 1276 | return s; |
| 1277 | message (TRUE, "%s: error accessing socket \"%s\"\n", |
| 1278 | progname, socket_name); |
| 1279 | exit (EXIT_FAILURE); |
| 1280 | } |
| 1281 | #endif |
| 1282 | |
| 1283 | /* Explicit --server-file arg or EMACS_SERVER_FILE variable. */ |
| 1284 | if (!server_file) |
| 1285 | server_file = egetenv ("EMACS_SERVER_FILE"); |
| 1286 | |
| 1287 | if (server_file) |
| 1288 | { |
| 1289 | s = set_tcp_socket (); |
| 1290 | if ((s != INVALID_SOCKET) || alternate_editor) |
| 1291 | return s; |
| 1292 | |
| 1293 | message (TRUE, "%s: error accessing server file \"%s\"\n", |
| 1294 | progname, server_file); |
| 1295 | exit (EXIT_FAILURE); |
| 1296 | } |
| 1297 | |
| 1298 | #ifndef NO_SOCKETS_IN_FILE_SYSTEM |
| 1299 | /* Implicit local socket. */ |
| 1300 | s = set_local_socket (); |
| 1301 | if (s != INVALID_SOCKET) |
| 1302 | return s; |
| 1303 | #endif |
| 1304 | |
| 1305 | /* Implicit server file. */ |
| 1306 | server_file = "server"; |
| 1307 | s = set_tcp_socket (); |
| 1308 | if ((s != INVALID_SOCKET) || alternate_editor) |
| 1309 | return s; |
| 1310 | |
| 1311 | /* No implicit or explicit socket, and no alternate editor. */ |
| 1312 | message (TRUE, "%s: No socket or alternate editor. Please use:\n\n" |
| 1313 | #ifndef NO_SOCKETS_IN_FILE_SYSTEM |
| 1314 | "\t--socket-name\n" |
| 1315 | #endif |
| 1316 | "\t--server-file (or environment variable EMACS_SERVER_FILE)\n\ |
| 1317 | \t--alternate-editor (or environment variable ALTERNATE_EDITOR)\n", |
| 1318 | progname); |
| 1319 | exit (EXIT_FAILURE); |
| 1320 | } |
| 1321 | |
| 1322 | #ifdef WINDOWSNT |
| 1323 | FARPROC set_fg; /* Pointer to AllowSetForegroundWindow. */ |
| 1324 | FARPROC get_wc; /* Pointer to RealGetWindowClassA. */ |
| 1325 | |
| 1326 | BOOL CALLBACK |
| 1327 | w32_find_emacs_process (hWnd, lParam) |
| 1328 | HWND hWnd; |
| 1329 | LPARAM lParam; |
| 1330 | { |
| 1331 | DWORD pid; |
| 1332 | char class[6]; |
| 1333 | |
| 1334 | /* Reject any window not of class "Emacs". */ |
| 1335 | if (! get_wc (hWnd, class, sizeof (class)) |
| 1336 | || strcmp (class, "Emacs")) |
| 1337 | return TRUE; |
| 1338 | |
| 1339 | /* We only need the process id, not the thread id. */ |
| 1340 | (void) GetWindowThreadProcessId (hWnd, &pid); |
| 1341 | |
| 1342 | /* Not the one we're looking for. */ |
| 1343 | if (pid != (DWORD) emacs_pid) return TRUE; |
| 1344 | |
| 1345 | /* OK, let's raise it. */ |
| 1346 | set_fg (emacs_pid); |
| 1347 | |
| 1348 | /* Stop enumeration. */ |
| 1349 | return FALSE; |
| 1350 | } |
| 1351 | |
| 1352 | /* |
| 1353 | * Search for a window of class "Emacs" and owned by a process with |
| 1354 | * process id = emacs_pid. If found, allow it to grab the focus. |
| 1355 | */ |
| 1356 | void |
| 1357 | w32_give_focus () |
| 1358 | { |
| 1359 | HMODULE hUser32; |
| 1360 | |
| 1361 | /* It shouldn't happen when dealing with TCP sockets. */ |
| 1362 | if (!emacs_pid) return; |
| 1363 | |
| 1364 | if (!(hUser32 = LoadLibrary ("user32.dll"))) return; |
| 1365 | |
| 1366 | /* Modern Windows restrict which processes can set the foreground window. |
| 1367 | emacsclient can allow Emacs to grab the focus by calling the function |
| 1368 | AllowSetForegroundWindow. Unfortunately, older Windows (W95, W98 and |
| 1369 | NT) lack this function, so we have to check its availability. */ |
| 1370 | if ((set_fg = GetProcAddress (hUser32, "AllowSetForegroundWindow")) |
| 1371 | && (get_wc = GetProcAddress (hUser32, "RealGetWindowClassA"))) |
| 1372 | EnumWindows (w32_find_emacs_process, (LPARAM) 0); |
| 1373 | |
| 1374 | FreeLibrary (hUser32); |
| 1375 | } |
| 1376 | #endif |
| 1377 | |
| 1378 | int |
| 1379 | main (argc, argv) |
| 1380 | int argc; |
| 1381 | char **argv; |
| 1382 | { |
| 1383 | int i, rl, needlf = 0; |
| 1384 | char *cwd, *str; |
| 1385 | char string[BUFSIZ+1]; |
| 1386 | |
| 1387 | main_argv = argv; |
| 1388 | progname = argv[0]; |
| 1389 | |
| 1390 | /* Process options. */ |
| 1391 | decode_options (argc, argv); |
| 1392 | |
| 1393 | if ((argc - optind < 1) && !eval && !tty && !window_system) |
| 1394 | { |
| 1395 | message (TRUE, "%s: file name or argument required\n" |
| 1396 | "Try `%s --help' for more information\n", |
| 1397 | progname, progname); |
| 1398 | exit (EXIT_FAILURE); |
| 1399 | } |
| 1400 | |
| 1401 | if ((emacs_socket = set_socket ()) == INVALID_SOCKET) |
| 1402 | fail (); |
| 1403 | |
| 1404 | |
| 1405 | cwd = get_current_dir_name (); |
| 1406 | if (cwd == 0) |
| 1407 | { |
| 1408 | /* getwd puts message in STRING if it fails. */ |
| 1409 | message (TRUE, "%s: %s\n", progname, |
| 1410 | "Cannot get current working directory"); |
| 1411 | fail (); |
| 1412 | } |
| 1413 | |
| 1414 | #ifdef WINDOWSNT |
| 1415 | w32_give_focus (); |
| 1416 | #endif |
| 1417 | |
| 1418 | /* Send over our environment. */ |
| 1419 | if (!current_frame) |
| 1420 | { |
| 1421 | extern char **environ; |
| 1422 | int i; |
| 1423 | for (i = 0; environ[i]; i++) |
| 1424 | { |
| 1425 | char *name = xstrdup (environ[i]); |
| 1426 | char *value = strchr (name, '='); |
| 1427 | send_to_emacs (emacs_socket, "-env "); |
| 1428 | quote_argument (emacs_socket, environ[i]); |
| 1429 | send_to_emacs (emacs_socket, " "); |
| 1430 | } |
| 1431 | } |
| 1432 | |
| 1433 | /* Send over our current directory. */ |
| 1434 | if (!current_frame) |
| 1435 | { |
| 1436 | send_to_emacs (emacs_socket, "-dir "); |
| 1437 | quote_argument (emacs_socket, cwd); |
| 1438 | send_to_emacs (emacs_socket, "/"); |
| 1439 | send_to_emacs (emacs_socket, " "); |
| 1440 | } |
| 1441 | |
| 1442 | retry: |
| 1443 | if (nowait) |
| 1444 | send_to_emacs (emacs_socket, "-nowait "); |
| 1445 | |
| 1446 | if (current_frame) |
| 1447 | send_to_emacs (emacs_socket, "-current-frame "); |
| 1448 | |
| 1449 | if (display) |
| 1450 | { |
| 1451 | send_to_emacs (emacs_socket, "-display "); |
| 1452 | quote_argument (emacs_socket, display); |
| 1453 | send_to_emacs (emacs_socket, " "); |
| 1454 | } |
| 1455 | |
| 1456 | if (tty) |
| 1457 | { |
| 1458 | char *type = egetenv ("TERM"); |
| 1459 | char *tty_name = NULL; |
| 1460 | #ifndef WINDOWSNT |
| 1461 | tty_name = ttyname (fileno (stdin)); |
| 1462 | #endif |
| 1463 | |
| 1464 | if (! tty_name) |
| 1465 | { |
| 1466 | message (TRUE, "%s: could not get terminal name\n", progname); |
| 1467 | fail (); |
| 1468 | } |
| 1469 | |
| 1470 | if (! type) |
| 1471 | { |
| 1472 | message (TRUE, "%s: please set the TERM variable to your terminal type\n", |
| 1473 | progname); |
| 1474 | fail (); |
| 1475 | } |
| 1476 | |
| 1477 | if (! strcmp (type, "eterm")) |
| 1478 | { |
| 1479 | /* This causes nasty, MULTI_KBOARD-related input lockouts. */ |
| 1480 | message (TRUE, "%s: opening a frame in an Emacs term buffer" |
| 1481 | " is not supported\n", progname); |
| 1482 | fail (); |
| 1483 | } |
| 1484 | #if !defined (NO_SOCKETS_IN_FILE_SYSTEM) |
| 1485 | init_signals (); |
| 1486 | #endif |
| 1487 | |
| 1488 | send_to_emacs (emacs_socket, "-tty "); |
| 1489 | quote_argument (emacs_socket, tty_name); |
| 1490 | send_to_emacs (emacs_socket, " "); |
| 1491 | quote_argument (emacs_socket, type); |
| 1492 | send_to_emacs (emacs_socket, " "); |
| 1493 | } |
| 1494 | |
| 1495 | if (window_system) |
| 1496 | send_to_emacs (emacs_socket, "-window-system "); |
| 1497 | |
| 1498 | if ((argc - optind > 0)) |
| 1499 | { |
| 1500 | for (i = optind; i < argc; i++) |
| 1501 | { |
| 1502 | int relative = 0; |
| 1503 | |
| 1504 | if (eval) |
| 1505 | { |
| 1506 | /* Don't prepend cwd or anything like that. */ |
| 1507 | send_to_emacs (emacs_socket, "-eval "); |
| 1508 | quote_argument (emacs_socket, argv[i]); |
| 1509 | send_to_emacs (emacs_socket, " "); |
| 1510 | continue; |
| 1511 | } |
| 1512 | |
| 1513 | if (*argv[i] == '+') |
| 1514 | { |
| 1515 | char *p = argv[i] + 1; |
| 1516 | while (isdigit ((unsigned char) *p) || *p == ':') p++; |
| 1517 | if (*p == 0) |
| 1518 | { |
| 1519 | send_to_emacs (emacs_socket, "-position "); |
| 1520 | quote_argument (emacs_socket, argv[i]); |
| 1521 | send_to_emacs (emacs_socket, " "); |
| 1522 | continue; |
| 1523 | } |
| 1524 | else |
| 1525 | relative = 1; |
| 1526 | } |
| 1527 | else if (! file_name_absolute_p (argv[i])) |
| 1528 | relative = 1; |
| 1529 | |
| 1530 | send_to_emacs (emacs_socket, "-file "); |
| 1531 | if (relative) |
| 1532 | { |
| 1533 | quote_argument (emacs_socket, cwd); |
| 1534 | send_to_emacs (emacs_socket, "/"); |
| 1535 | } |
| 1536 | quote_argument (emacs_socket, argv[i]); |
| 1537 | send_to_emacs (emacs_socket, " "); |
| 1538 | } |
| 1539 | } |
| 1540 | else |
| 1541 | { |
| 1542 | if (!tty && !window_system) |
| 1543 | { |
| 1544 | while ((str = fgets (string, BUFSIZ, stdin))) |
| 1545 | { |
| 1546 | if (eval) |
| 1547 | send_to_emacs (emacs_socket, "-eval "); |
| 1548 | else |
| 1549 | send_to_emacs (emacs_socket, "-file "); |
| 1550 | quote_argument (emacs_socket, str); |
| 1551 | } |
| 1552 | send_to_emacs (emacs_socket, " "); |
| 1553 | } |
| 1554 | } |
| 1555 | |
| 1556 | send_to_emacs (emacs_socket, "\n"); |
| 1557 | |
| 1558 | /* Wait for an answer. */ |
| 1559 | if (!eval && !tty && !nowait) |
| 1560 | { |
| 1561 | printf ("Waiting for Emacs..."); |
| 1562 | needlf = 2; |
| 1563 | } |
| 1564 | fflush (stdout); |
| 1565 | fsync (1); |
| 1566 | |
| 1567 | /* Now, wait for an answer and print any messages. */ |
| 1568 | while ((rl = recv (emacs_socket, string, BUFSIZ, 0)) > 0) |
| 1569 | { |
| 1570 | char *p; |
| 1571 | string[rl] = '\0'; |
| 1572 | |
| 1573 | p = string + strlen (string) - 1; |
| 1574 | while (p > string && *p == '\n') |
| 1575 | *p-- = 0; |
| 1576 | |
| 1577 | if (strprefix ("-emacs-pid ", string)) |
| 1578 | { |
| 1579 | /* -emacs-pid PID: The process id of the Emacs process. */ |
| 1580 | emacs_pid = strtol (string + strlen ("-emacs-pid"), NULL, 10); |
| 1581 | } |
| 1582 | else if (strprefix ("-window-system-unsupported ", string)) |
| 1583 | { |
| 1584 | /* -window-system-unsupported: Emacs was compiled without X |
| 1585 | support. Try again on the terminal. */ |
| 1586 | window_system = 0; |
| 1587 | nowait = 0; |
| 1588 | tty = 1; |
| 1589 | goto retry; |
| 1590 | } |
| 1591 | else if (strprefix ("-print ", string)) |
| 1592 | { |
| 1593 | /* -print STRING: Print STRING on the terminal. */ |
| 1594 | str = unquote_argument (string + strlen ("-print ")); |
| 1595 | if (needlf) |
| 1596 | printf ("\n"); |
| 1597 | printf ("%s", str); |
| 1598 | needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n'; |
| 1599 | } |
| 1600 | else if (strprefix ("-error ", string)) |
| 1601 | { |
| 1602 | /* -error DESCRIPTION: Signal an error on the terminal. */ |
| 1603 | str = unquote_argument (string + strlen ("-error ")); |
| 1604 | if (needlf) |
| 1605 | printf ("\n"); |
| 1606 | fprintf (stderr, "*ERROR*: %s", str); |
| 1607 | needlf = str[0] == '\0' ? needlf : str[strlen (str) - 1] != '\n'; |
| 1608 | } |
| 1609 | #ifdef SIGSTOP |
| 1610 | else if (strprefix ("-suspend ", string)) |
| 1611 | { |
| 1612 | /* -suspend: Suspend this terminal, i.e., stop the process. */ |
| 1613 | if (needlf) |
| 1614 | printf ("\n"); |
| 1615 | needlf = 0; |
| 1616 | kill (0, SIGSTOP); |
| 1617 | } |
| 1618 | #endif |
| 1619 | else |
| 1620 | { |
| 1621 | /* Unknown command. */ |
| 1622 | if (needlf) |
| 1623 | printf ("\n"); |
| 1624 | printf ("*ERROR*: Unknown message: %s", string); |
| 1625 | needlf = string[0] == '\0' ? needlf : string[strlen (string) - 1] != '\n'; |
| 1626 | } |
| 1627 | } |
| 1628 | |
| 1629 | if (needlf) |
| 1630 | printf ("\n"); |
| 1631 | fflush (stdout); |
| 1632 | fsync (1); |
| 1633 | |
| 1634 | CLOSE_SOCKET (emacs_socket); |
| 1635 | return EXIT_SUCCESS; |
| 1636 | } |
| 1637 | |
| 1638 | #endif /* HAVE_SOCKETS && HAVE_INET_SOCKETS */ |
| 1639 | |
| 1640 | \f |
| 1641 | #ifndef HAVE_STRERROR |
| 1642 | char * |
| 1643 | strerror (errnum) |
| 1644 | int errnum; |
| 1645 | { |
| 1646 | extern char *sys_errlist[]; |
| 1647 | extern int sys_nerr; |
| 1648 | |
| 1649 | if (errnum >= 0 && errnum < sys_nerr) |
| 1650 | return sys_errlist[errnum]; |
| 1651 | return (char *) "Unknown error"; |
| 1652 | } |
| 1653 | |
| 1654 | #endif /* ! HAVE_STRERROR */ |
| 1655 | |
| 1656 | /* arch-tag: f39bb9c4-73eb-477e-896d-50832e2ca9a7 |
| 1657 | (do not change this comment) */ |
| 1658 | |
| 1659 | /* emacsclient.c ends here */ |