| 1 | /* Synchronous subprocess invocation for GNU Emacs. |
| 2 | Copyright (C) 1985, 1986, 1987, 1988, 1993, 1994 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GNU Emacs. |
| 5 | |
| 6 | GNU Emacs is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2, or (at your option) |
| 9 | any later version. |
| 10 | |
| 11 | GNU Emacs is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with GNU Emacs; see the file COPYING. If not, write to |
| 18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | |
| 21 | #include <signal.h> |
| 22 | #include <errno.h> |
| 23 | #include <stdio.h> |
| 24 | |
| 25 | #include <config.h> |
| 26 | |
| 27 | extern int errno; |
| 28 | extern char *strerror (); |
| 29 | |
| 30 | /* Define SIGCHLD as an alias for SIGCLD. */ |
| 31 | |
| 32 | #if !defined (SIGCHLD) && defined (SIGCLD) |
| 33 | #define SIGCHLD SIGCLD |
| 34 | #endif /* SIGCLD */ |
| 35 | |
| 36 | #include <sys/types.h> |
| 37 | |
| 38 | #include <sys/file.h> |
| 39 | #ifdef USG5 |
| 40 | #define INCLUDED_FCNTL |
| 41 | #include <fcntl.h> |
| 42 | #endif |
| 43 | |
| 44 | #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */ |
| 45 | #define INCLUDED_FCNTL |
| 46 | #include <fcntl.h> |
| 47 | #include <sys/stat.h> |
| 48 | #include <sys/param.h> |
| 49 | #include <errno.h> |
| 50 | #endif /* MSDOS */ |
| 51 | |
| 52 | #ifndef O_RDONLY |
| 53 | #define O_RDONLY 0 |
| 54 | #endif |
| 55 | |
| 56 | #ifndef O_WRONLY |
| 57 | #define O_WRONLY 1 |
| 58 | #endif |
| 59 | |
| 60 | #include "lisp.h" |
| 61 | #include "commands.h" |
| 62 | #include "buffer.h" |
| 63 | #include <paths.h> |
| 64 | #include "process.h" |
| 65 | #include "syssignal.h" |
| 66 | #include "systty.h" |
| 67 | |
| 68 | #ifdef VMS |
| 69 | extern noshare char **environ; |
| 70 | #else |
| 71 | extern char **environ; |
| 72 | #endif |
| 73 | |
| 74 | #define max(a, b) ((a) > (b) ? (a) : (b)) |
| 75 | |
| 76 | #ifdef MSDOS |
| 77 | Lisp_Object Vbinary_process; |
| 78 | #endif |
| 79 | |
| 80 | Lisp_Object Vexec_path, Vexec_directory, Vdata_directory, Vdoc_directory; |
| 81 | Lisp_Object Vconfigure_info_directory; |
| 82 | |
| 83 | Lisp_Object Vshell_file_name; |
| 84 | |
| 85 | Lisp_Object Vprocess_environment; |
| 86 | |
| 87 | /* True iff we are about to fork off a synchronous process or if we |
| 88 | are waiting for it. */ |
| 89 | int synch_process_alive; |
| 90 | |
| 91 | /* Nonzero => this is a string explaining death of synchronous subprocess. */ |
| 92 | char *synch_process_death; |
| 93 | |
| 94 | /* If synch_process_death is zero, |
| 95 | this is exit code of synchronous subprocess. */ |
| 96 | int synch_process_retcode; |
| 97 | |
| 98 | extern Lisp_Object Vdoc_file_name; |
| 99 | \f |
| 100 | /* Clean up when exiting Fcall_process. |
| 101 | On MSDOS, delete the temporary file on any kind of termination. |
| 102 | On Unix, kill the process and any children on termination by signal. */ |
| 103 | |
| 104 | /* Nonzero if this is termination due to exit. */ |
| 105 | static int call_process_exited; |
| 106 | |
| 107 | #ifndef VMS /* VMS version is in vmsproc.c. */ |
| 108 | |
| 109 | static Lisp_Object |
| 110 | call_process_kill (fdpid) |
| 111 | Lisp_Object fdpid; |
| 112 | { |
| 113 | close (XFASTINT (Fcar (fdpid))); |
| 114 | EMACS_KILLPG (XFASTINT (Fcdr (fdpid)), SIGKILL); |
| 115 | synch_process_alive = 0; |
| 116 | return Qnil; |
| 117 | } |
| 118 | |
| 119 | Lisp_Object |
| 120 | call_process_cleanup (fdpid) |
| 121 | Lisp_Object fdpid; |
| 122 | { |
| 123 | #ifdef MSDOS |
| 124 | /* for MSDOS fdpid is really (fd . tempfile) */ |
| 125 | register Lisp_Object file; |
| 126 | file = Fcdr (fdpid); |
| 127 | close (XFASTINT (Fcar (fdpid))); |
| 128 | if (strcmp (XSTRING (file)-> data, NULL_DEVICE) != 0) |
| 129 | unlink (XSTRING (file)->data); |
| 130 | #else /* not MSDOS */ |
| 131 | register int pid = XFASTINT (Fcdr (fdpid)); |
| 132 | |
| 133 | |
| 134 | if (call_process_exited) |
| 135 | { |
| 136 | close (XFASTINT (Fcar (fdpid))); |
| 137 | return Qnil; |
| 138 | } |
| 139 | |
| 140 | if (EMACS_KILLPG (pid, SIGINT) == 0) |
| 141 | { |
| 142 | int count = specpdl_ptr - specpdl; |
| 143 | record_unwind_protect (call_process_kill, fdpid); |
| 144 | message1 ("Waiting for process to die...(type C-g again to kill it instantly)"); |
| 145 | immediate_quit = 1; |
| 146 | QUIT; |
| 147 | wait_for_termination (pid); |
| 148 | immediate_quit = 0; |
| 149 | specpdl_ptr = specpdl + count; /* Discard the unwind protect. */ |
| 150 | message1 ("Waiting for process to die...done"); |
| 151 | } |
| 152 | synch_process_alive = 0; |
| 153 | close (XFASTINT (Fcar (fdpid))); |
| 154 | #endif /* not MSDOS */ |
| 155 | return Qnil; |
| 156 | } |
| 157 | |
| 158 | DEFUN ("call-process", Fcall_process, Scall_process, 1, MANY, 0, |
| 159 | "Call PROGRAM synchronously in separate process.\n\ |
| 160 | The program's input comes from file INFILE (nil means `/dev/null').\n\ |
| 161 | Insert output in BUFFER before point; t means current buffer;\n\ |
| 162 | nil for BUFFER means discard it; 0 means discard and don't wait.\n\ |
| 163 | Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\ |
| 164 | Remaining arguments are strings passed as command arguments to PROGRAM.\n\ |
| 165 | If BUFFER is 0, returns immediately with value nil.\n\ |
| 166 | Otherwise waits for PROGRAM to terminate\n\ |
| 167 | and returns a numeric exit status or a signal description string.\n\ |
| 168 | If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.") |
| 169 | (nargs, args) |
| 170 | int nargs; |
| 171 | register Lisp_Object *args; |
| 172 | { |
| 173 | Lisp_Object infile, buffer, current_dir, display, path; |
| 174 | int fd[2]; |
| 175 | int filefd; |
| 176 | register int pid; |
| 177 | char buf[1024]; |
| 178 | int count = specpdl_ptr - specpdl; |
| 179 | register unsigned char **new_argv |
| 180 | = (unsigned char **) alloca ((max (2, nargs - 2)) * sizeof (char *)); |
| 181 | struct buffer *old = current_buffer; |
| 182 | #ifdef MSDOS /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */ |
| 183 | char *outf, *tempfile; |
| 184 | int outfilefd; |
| 185 | #endif |
| 186 | #if 0 |
| 187 | int mask; |
| 188 | #endif |
| 189 | CHECK_STRING (args[0], 0); |
| 190 | |
| 191 | #ifndef subprocesses |
| 192 | /* Without asynchronous processes we cannot have BUFFER == 0. */ |
| 193 | if (nargs >= 3 && XTYPE (args[2]) == Lisp_Int) |
| 194 | error ("Operating system cannot handle asynchronous subprocesses"); |
| 195 | #endif /* subprocesses */ |
| 196 | |
| 197 | if (nargs >= 2 && ! NILP (args[1])) |
| 198 | { |
| 199 | infile = Fexpand_file_name (args[1], current_buffer->directory); |
| 200 | CHECK_STRING (infile, 1); |
| 201 | } |
| 202 | else |
| 203 | infile = build_string (NULL_DEVICE); |
| 204 | |
| 205 | if (nargs >= 3) |
| 206 | { |
| 207 | register Lisp_Object tem; |
| 208 | |
| 209 | buffer = tem = args[2]; |
| 210 | if (!(EQ (tem, Qnil) |
| 211 | || EQ (tem, Qt) |
| 212 | || XFASTINT (tem) == 0)) |
| 213 | { |
| 214 | buffer = Fget_buffer (tem); |
| 215 | CHECK_BUFFER (buffer, 2); |
| 216 | } |
| 217 | } |
| 218 | else |
| 219 | buffer = Qnil; |
| 220 | |
| 221 | /* Make sure that the child will be able to chdir to the current |
| 222 | buffer's current directory, or its unhandled equivalent. We |
| 223 | can't just have the child check for an error when it does the |
| 224 | chdir, since it's in a vfork. |
| 225 | |
| 226 | We have to GCPRO around this because Fexpand_file_name, |
| 227 | Funhandled_file_name_directory, and Ffile_accessible_directory_p |
| 228 | might call a file name handling function. The argument list is |
| 229 | protected by the caller, so all we really have to worry about is |
| 230 | buffer. */ |
| 231 | { |
| 232 | struct gcpro gcpro1, gcpro2, gcpro3; |
| 233 | |
| 234 | current_dir = current_buffer->directory; |
| 235 | |
| 236 | GCPRO3 (infile, buffer, current_dir); |
| 237 | |
| 238 | current_dir |
| 239 | = expand_and_dir_to_file (Funhandled_file_name_directory (current_dir), |
| 240 | Qnil); |
| 241 | if (NILP (Ffile_accessible_directory_p (current_dir))) |
| 242 | report_file_error ("Setting current directory", |
| 243 | Fcons (current_buffer->directory, Qnil)); |
| 244 | |
| 245 | UNGCPRO; |
| 246 | } |
| 247 | |
| 248 | display = nargs >= 4 ? args[3] : Qnil; |
| 249 | |
| 250 | filefd = open (XSTRING (infile)->data, O_RDONLY, 0); |
| 251 | if (filefd < 0) |
| 252 | { |
| 253 | report_file_error ("Opening process input file", Fcons (infile, Qnil)); |
| 254 | } |
| 255 | /* Search for program; barf if not found. */ |
| 256 | { |
| 257 | struct gcpro gcpro1; |
| 258 | |
| 259 | GCPRO1 (current_dir); |
| 260 | openp (Vexec_path, args[0], EXEC_SUFFIXES, &path, 1); |
| 261 | UNGCPRO; |
| 262 | } |
| 263 | if (NILP (path)) |
| 264 | { |
| 265 | close (filefd); |
| 266 | report_file_error ("Searching for program", Fcons (args[0], Qnil)); |
| 267 | } |
| 268 | new_argv[0] = XSTRING (path)->data; |
| 269 | { |
| 270 | register int i; |
| 271 | for (i = 4; i < nargs; i++) |
| 272 | { |
| 273 | CHECK_STRING (args[i], i); |
| 274 | new_argv[i - 3] = XSTRING (args[i])->data; |
| 275 | } |
| 276 | new_argv[i - 3] = 0; |
| 277 | } |
| 278 | |
| 279 | #ifdef MSDOS /* MW, July 1993 */ |
| 280 | /* These vars record information from process termination. |
| 281 | Clear them now before process can possibly terminate, |
| 282 | to avoid timing error if process terminates soon. */ |
| 283 | synch_process_death = 0; |
| 284 | synch_process_retcode = 0; |
| 285 | |
| 286 | if ((outf = egetenv ("TMP")) || (outf = egetenv ("TEMP"))) |
| 287 | strcpy (tempfile = alloca (strlen (outf) + 20), outf); |
| 288 | else |
| 289 | { |
| 290 | tempfile = alloca (20); |
| 291 | *tempfile = '\0'; |
| 292 | } |
| 293 | dostounix_filename (tempfile); |
| 294 | if (*tempfile == '\0' || tempfile[strlen (tempfile) - 1] != '/') |
| 295 | strcat (tempfile, "/"); |
| 296 | strcat (tempfile, "detmp.XXX"); |
| 297 | mktemp (tempfile); |
| 298 | |
| 299 | outfilefd = creat (tempfile, S_IREAD | S_IWRITE); |
| 300 | if (outfilefd < 0) |
| 301 | { |
| 302 | close (filefd); |
| 303 | report_file_error ("Opening process output file", Fcons (tempfile, Qnil)); |
| 304 | } |
| 305 | #endif |
| 306 | |
| 307 | if (XTYPE (buffer) == Lisp_Int) |
| 308 | fd[1] = open (NULL_DEVICE, O_WRONLY), fd[0] = -1; |
| 309 | else |
| 310 | { |
| 311 | #ifndef MSDOS |
| 312 | pipe (fd); |
| 313 | #endif |
| 314 | #if 0 |
| 315 | /* Replaced by close_process_descs */ |
| 316 | set_exclusive_use (fd[0]); |
| 317 | #endif |
| 318 | } |
| 319 | |
| 320 | { |
| 321 | /* child_setup must clobber environ in systems with true vfork. |
| 322 | Protect it from permanent change. */ |
| 323 | register char **save_environ = environ; |
| 324 | register int fd1 = fd[1]; |
| 325 | |
| 326 | #if 0 /* Some systems don't have sigblock. */ |
| 327 | mask = sigblock (sigmask (SIGCHLD)); |
| 328 | #endif |
| 329 | |
| 330 | /* Record that we're about to create a synchronous process. */ |
| 331 | synch_process_alive = 1; |
| 332 | |
| 333 | /* These vars record information from process termination. |
| 334 | Clear them now before process can possibly terminate, |
| 335 | to avoid timing error if process terminates soon. */ |
| 336 | synch_process_death = 0; |
| 337 | synch_process_retcode = 0; |
| 338 | |
| 339 | #ifdef MSDOS /* MW, July 1993 */ |
| 340 | /* ??? Someone who knows MSDOG needs to check whether this properly |
| 341 | closes all descriptors that it opens. */ |
| 342 | pid = run_msdos_command (new_argv, current_dir, filefd, outfilefd); |
| 343 | close (outfilefd); |
| 344 | fd1 = -1; /* No harm in closing that one! */ |
| 345 | fd[0] = open (tempfile, NILP (Vbinary_process) ? O_TEXT : O_BINARY); |
| 346 | if (fd[0] < 0) |
| 347 | { |
| 348 | unlink (tempfile); |
| 349 | close (filefd); |
| 350 | report_file_error ("Cannot re-open temporary file", Qnil); |
| 351 | } |
| 352 | #else /* not MSDOS */ |
| 353 | pid = vfork (); |
| 354 | |
| 355 | if (pid == 0) |
| 356 | { |
| 357 | if (fd[0] >= 0) |
| 358 | close (fd[0]); |
| 359 | #ifdef USG |
| 360 | setpgrp (); |
| 361 | #else |
| 362 | setpgrp (pid, pid); |
| 363 | #endif /* USG */ |
| 364 | child_setup (filefd, fd1, fd1, new_argv, 0, current_dir); |
| 365 | } |
| 366 | #endif /* not MSDOS */ |
| 367 | |
| 368 | environ = save_environ; |
| 369 | |
| 370 | /* Close most of our fd's, but not fd[0] |
| 371 | since we will use that to read input from. */ |
| 372 | close (filefd); |
| 373 | if (fd1 >= 0) |
| 374 | close (fd1); |
| 375 | } |
| 376 | |
| 377 | if (pid < 0) |
| 378 | { |
| 379 | if (fd[0] >= 0) |
| 380 | close (fd[0]); |
| 381 | report_file_error ("Doing vfork", Qnil); |
| 382 | } |
| 383 | |
| 384 | if (XTYPE (buffer) == Lisp_Int) |
| 385 | { |
| 386 | if (fd[0] >= 0) |
| 387 | close (fd[0]); |
| 388 | #ifndef subprocesses |
| 389 | /* If Emacs has been built with asynchronous subprocess support, |
| 390 | we don't need to do this, I think because it will then have |
| 391 | the facilities for handling SIGCHLD. */ |
| 392 | wait_without_blocking (); |
| 393 | #endif /* subprocesses */ |
| 394 | return Qnil; |
| 395 | } |
| 396 | |
| 397 | /* Enable sending signal if user quits below. */ |
| 398 | call_process_exited = 0; |
| 399 | |
| 400 | #ifdef MSDOS |
| 401 | /* MSDOS needs different cleanup information. */ |
| 402 | record_unwind_protect (call_process_cleanup, |
| 403 | Fcons (make_number (fd[0]), build_string (tempfile))); |
| 404 | #else |
| 405 | record_unwind_protect (call_process_cleanup, |
| 406 | Fcons (make_number (fd[0]), make_number (pid))); |
| 407 | #endif /* not MSDOS */ |
| 408 | |
| 409 | |
| 410 | if (XTYPE (buffer) == Lisp_Buffer) |
| 411 | Fset_buffer (buffer); |
| 412 | |
| 413 | immediate_quit = 1; |
| 414 | QUIT; |
| 415 | |
| 416 | { |
| 417 | register int nread; |
| 418 | int first = 1; |
| 419 | |
| 420 | while ((nread = read (fd[0], buf, sizeof buf)) > 0) |
| 421 | { |
| 422 | immediate_quit = 0; |
| 423 | if (!NILP (buffer)) |
| 424 | insert (buf, nread); |
| 425 | if (!NILP (display) && INTERACTIVE) |
| 426 | { |
| 427 | if (first) |
| 428 | prepare_menu_bars (); |
| 429 | first = 0; |
| 430 | redisplay_preserve_echo_area (); |
| 431 | } |
| 432 | immediate_quit = 1; |
| 433 | QUIT; |
| 434 | } |
| 435 | } |
| 436 | |
| 437 | /* Wait for it to terminate, unless it already has. */ |
| 438 | wait_for_termination (pid); |
| 439 | |
| 440 | immediate_quit = 0; |
| 441 | |
| 442 | set_buffer_internal (old); |
| 443 | |
| 444 | /* Don't kill any children that the subprocess may have left behind |
| 445 | when exiting. */ |
| 446 | call_process_exited = 1; |
| 447 | |
| 448 | unbind_to (count, Qnil); |
| 449 | |
| 450 | if (synch_process_death) |
| 451 | return build_string (synch_process_death); |
| 452 | return make_number (synch_process_retcode); |
| 453 | } |
| 454 | #endif |
| 455 | \f |
| 456 | static Lisp_Object |
| 457 | delete_temp_file (name) |
| 458 | Lisp_Object name; |
| 459 | { |
| 460 | unlink (XSTRING (name)->data); |
| 461 | } |
| 462 | |
| 463 | DEFUN ("call-process-region", Fcall_process_region, Scall_process_region, |
| 464 | 3, MANY, 0, |
| 465 | "Send text from START to END to a synchronous process running PROGRAM.\n\ |
| 466 | Delete the text if fourth arg DELETE is non-nil.\n\ |
| 467 | Insert output in BUFFER before point; t means current buffer;\n\ |
| 468 | nil for BUFFER means discard it; 0 means discard and don't wait.\n\ |
| 469 | Sixth arg DISPLAY non-nil means redisplay buffer as output is inserted.\n\ |
| 470 | Remaining args are passed to PROGRAM at startup as command args.\n\ |
| 471 | If BUFFER is nil, returns immediately with value nil.\n\ |
| 472 | Otherwise waits for PROGRAM to terminate\n\ |
| 473 | and returns a numeric exit status or a signal description string.\n\ |
| 474 | If you quit, the process is killed with SIGINT, or SIGKILL if you quit again.") |
| 475 | (nargs, args) |
| 476 | int nargs; |
| 477 | register Lisp_Object *args; |
| 478 | { |
| 479 | register Lisp_Object filename_string, start, end; |
| 480 | #ifdef MSDOS |
| 481 | char *tempfile; |
| 482 | #else |
| 483 | char tempfile[20]; |
| 484 | #endif |
| 485 | int count = specpdl_ptr - specpdl; |
| 486 | #ifdef MSDOS |
| 487 | char *outf = '\0'; |
| 488 | |
| 489 | if ((outf = egetenv ("TMP")) || (outf = egetenv ("TEMP"))) |
| 490 | strcpy (tempfile = alloca (strlen (outf) + 20), outf); |
| 491 | else |
| 492 | { |
| 493 | tempfile = alloca (20); |
| 494 | *tempfile = '\0'; |
| 495 | } |
| 496 | dostounix_filename (tempfile); |
| 497 | if (tempfile[strlen (tempfile) - 1] != '/') |
| 498 | strcat (tempfile, "/"); |
| 499 | strcat (tempfile, "detmp.XXX"); |
| 500 | #else /* not MSDOS */ |
| 501 | |
| 502 | #ifdef VMS |
| 503 | strcpy (tempfile, "tmp:emacsXXXXXX."); |
| 504 | #else |
| 505 | strcpy (tempfile, "/tmp/emacsXXXXXX"); |
| 506 | #endif |
| 507 | #endif /* not MSDOS */ |
| 508 | |
| 509 | mktemp (tempfile); |
| 510 | |
| 511 | filename_string = build_string (tempfile); |
| 512 | start = args[0]; |
| 513 | end = args[1]; |
| 514 | Fwrite_region (start, end, filename_string, Qnil, Qlambda); |
| 515 | record_unwind_protect (delete_temp_file, filename_string); |
| 516 | |
| 517 | if (!NILP (args[3])) |
| 518 | Fdelete_region (start, end); |
| 519 | |
| 520 | args[3] = filename_string; |
| 521 | |
| 522 | return unbind_to (count, Fcall_process (nargs - 2, args + 2)); |
| 523 | } |
| 524 | \f |
| 525 | #ifndef VMS /* VMS version is in vmsproc.c. */ |
| 526 | |
| 527 | /* This is the last thing run in a newly forked inferior |
| 528 | either synchronous or asynchronous. |
| 529 | Copy descriptors IN, OUT and ERR as descriptors 0, 1 and 2. |
| 530 | Initialize inferior's priority, pgrp, connected dir and environment. |
| 531 | then exec another program based on new_argv. |
| 532 | |
| 533 | This function may change environ for the superior process. |
| 534 | Therefore, the superior process must save and restore the value |
| 535 | of environ around the vfork and the call to this function. |
| 536 | |
| 537 | ENV is the environment for the subprocess. |
| 538 | |
| 539 | SET_PGRP is nonzero if we should put the subprocess into a separate |
| 540 | process group. |
| 541 | |
| 542 | CURRENT_DIR is an elisp string giving the path of the current |
| 543 | directory the subprocess should have. Since we can't really signal |
| 544 | a decent error from within the child, this should be verified as an |
| 545 | executable directory by the parent. */ |
| 546 | |
| 547 | child_setup (in, out, err, new_argv, set_pgrp, current_dir) |
| 548 | int in, out, err; |
| 549 | register char **new_argv; |
| 550 | int set_pgrp; |
| 551 | Lisp_Object current_dir; |
| 552 | { |
| 553 | #ifdef MSDOS |
| 554 | /* The MSDOS port of gcc cannot fork, vfork, ... so we must call system |
| 555 | instead. */ |
| 556 | #else /* not MSDOS */ |
| 557 | char **env; |
| 558 | |
| 559 | int pid = getpid (); |
| 560 | |
| 561 | #ifdef PRIO_PROCESS |
| 562 | { |
| 563 | extern int emacs_priority; |
| 564 | |
| 565 | nice (- emacs_priority); |
| 566 | } |
| 567 | #endif |
| 568 | |
| 569 | #ifdef subprocesses |
| 570 | /* Close Emacs's descriptors that this process should not have. */ |
| 571 | close_process_descs (); |
| 572 | #endif |
| 573 | close_load_descs (); |
| 574 | |
| 575 | /* Note that use of alloca is always safe here. It's obvious for systems |
| 576 | that do not have true vfork or that have true (stack) alloca. |
| 577 | If using vfork and C_ALLOCA it is safe because that changes |
| 578 | the superior's static variables as if the superior had done alloca |
| 579 | and will be cleaned up in the usual way. */ |
| 580 | { |
| 581 | register unsigned char *temp; |
| 582 | register int i; |
| 583 | |
| 584 | i = XSTRING (current_dir)->size; |
| 585 | temp = (unsigned char *) alloca (i + 2); |
| 586 | bcopy (XSTRING (current_dir)->data, temp, i); |
| 587 | if (temp[i - 1] != '/') temp[i++] = '/'; |
| 588 | temp[i] = 0; |
| 589 | |
| 590 | /* We can't signal an Elisp error here; we're in a vfork. Since |
| 591 | the callers check the current directory before forking, this |
| 592 | should only return an error if the directory's permissions |
| 593 | are changed between the check and this chdir, but we should |
| 594 | at least check. */ |
| 595 | if (chdir (temp) < 0) |
| 596 | exit (errno); |
| 597 | } |
| 598 | |
| 599 | /* Set `env' to a vector of the strings in Vprocess_environment. */ |
| 600 | { |
| 601 | register Lisp_Object tem; |
| 602 | register char **new_env; |
| 603 | register int new_length; |
| 604 | |
| 605 | new_length = 0; |
| 606 | for (tem = Vprocess_environment; |
| 607 | (XTYPE (tem) == Lisp_Cons |
| 608 | && XTYPE (XCONS (tem)->car) == Lisp_String); |
| 609 | tem = XCONS (tem)->cdr) |
| 610 | new_length++; |
| 611 | |
| 612 | /* new_length + 1 to include terminating 0. */ |
| 613 | env = new_env = (char **) alloca ((new_length + 1) * sizeof (char *)); |
| 614 | |
| 615 | /* Copy the Vprocess_environment strings into new_env. */ |
| 616 | for (tem = Vprocess_environment; |
| 617 | (XTYPE (tem) == Lisp_Cons |
| 618 | && XTYPE (XCONS (tem)->car) == Lisp_String); |
| 619 | tem = XCONS (tem)->cdr) |
| 620 | { |
| 621 | char **ep = env; |
| 622 | char *string = (char *) XSTRING (XCONS (tem)->car)->data; |
| 623 | /* See if this string duplicates any string already in the env. |
| 624 | If so, don't put it in. |
| 625 | When an env var has multiple definitions, |
| 626 | we keep the definition that comes first in process-environment. */ |
| 627 | for (; ep != new_env; ep++) |
| 628 | { |
| 629 | char *p = *ep, *q = string; |
| 630 | while (1) |
| 631 | { |
| 632 | if (*q == 0) |
| 633 | /* The string is malformed; might as well drop it. */ |
| 634 | goto duplicate; |
| 635 | if (*q != *p) |
| 636 | break; |
| 637 | if (*q == '=') |
| 638 | goto duplicate; |
| 639 | p++, q++; |
| 640 | } |
| 641 | } |
| 642 | *new_env++ = string; |
| 643 | duplicate: ; |
| 644 | } |
| 645 | *new_env = 0; |
| 646 | } |
| 647 | |
| 648 | /* Make sure that in, out, and err are not actually already in |
| 649 | descriptors zero, one, or two; this could happen if Emacs is |
| 650 | started with its standard in, out, or error closed, as might |
| 651 | happen under X. */ |
| 652 | in = relocate_fd (in, 3); |
| 653 | if (out == err) |
| 654 | err = out = relocate_fd (out, 3); |
| 655 | else |
| 656 | { |
| 657 | out = relocate_fd (out, 3); |
| 658 | err = relocate_fd (err, 3); |
| 659 | } |
| 660 | |
| 661 | close (0); |
| 662 | close (1); |
| 663 | close (2); |
| 664 | |
| 665 | dup2 (in, 0); |
| 666 | dup2 (out, 1); |
| 667 | dup2 (err, 2); |
| 668 | close (in); |
| 669 | close (out); |
| 670 | close (err); |
| 671 | |
| 672 | #ifdef USG |
| 673 | #ifndef SETPGRP_RELEASES_CTTY |
| 674 | setpgrp (); /* No arguments but equivalent in this case */ |
| 675 | #endif |
| 676 | #else |
| 677 | setpgrp (pid, pid); |
| 678 | #endif /* USG */ |
| 679 | /* setpgrp_of_tty is incorrect here; it uses input_fd. */ |
| 680 | EMACS_SET_TTY_PGRP (0, &pid); |
| 681 | |
| 682 | #ifdef vipc |
| 683 | something missing here; |
| 684 | #endif /* vipc */ |
| 685 | |
| 686 | /* execvp does not accept an environment arg so the only way |
| 687 | to pass this environment is to set environ. Our caller |
| 688 | is responsible for restoring the ambient value of environ. */ |
| 689 | environ = env; |
| 690 | execvp (new_argv[0], new_argv); |
| 691 | |
| 692 | write (1, "Couldn't exec the program ", 26); |
| 693 | write (1, new_argv[0], strlen (new_argv[0])); |
| 694 | _exit (1); |
| 695 | #endif /* not MSDOS */ |
| 696 | } |
| 697 | |
| 698 | /* Move the file descriptor FD so that its number is not less than MIN. |
| 699 | If the file descriptor is moved at all, the original is freed. */ |
| 700 | int |
| 701 | relocate_fd (fd, min) |
| 702 | int fd, min; |
| 703 | { |
| 704 | if (fd >= min) |
| 705 | return fd; |
| 706 | else |
| 707 | { |
| 708 | int new = dup (fd); |
| 709 | if (new == -1) |
| 710 | { |
| 711 | char *message1 = "Error while setting up child: "; |
| 712 | char *errmessage = strerror (errno); |
| 713 | char *message2 = "\n"; |
| 714 | write (2, message1, strlen (message1)); |
| 715 | write (2, errmessage, strlen (errmessage)); |
| 716 | write (2, message2, strlen (message2)); |
| 717 | _exit (1); |
| 718 | } |
| 719 | /* Note that we hold the original FD open while we recurse, |
| 720 | to guarantee we'll get a new FD if we need it. */ |
| 721 | new = relocate_fd (new, min); |
| 722 | close (fd); |
| 723 | return new; |
| 724 | } |
| 725 | } |
| 726 | |
| 727 | static int |
| 728 | getenv_internal (var, varlen, value, valuelen) |
| 729 | char *var; |
| 730 | int varlen; |
| 731 | char **value; |
| 732 | int *valuelen; |
| 733 | { |
| 734 | Lisp_Object scan; |
| 735 | |
| 736 | for (scan = Vprocess_environment; CONSP (scan); scan = XCONS (scan)->cdr) |
| 737 | { |
| 738 | Lisp_Object entry; |
| 739 | |
| 740 | entry = XCONS (scan)->car; |
| 741 | if (XTYPE (entry) == Lisp_String |
| 742 | && XSTRING (entry)->size > varlen |
| 743 | && XSTRING (entry)->data[varlen] == '=' |
| 744 | && ! bcmp (XSTRING (entry)->data, var, varlen)) |
| 745 | { |
| 746 | *value = (char *) XSTRING (entry)->data + (varlen + 1); |
| 747 | *valuelen = XSTRING (entry)->size - (varlen + 1); |
| 748 | return 1; |
| 749 | } |
| 750 | } |
| 751 | |
| 752 | return 0; |
| 753 | } |
| 754 | |
| 755 | DEFUN ("getenv", Fgetenv, Sgetenv, 1, 1, 0, |
| 756 | "Return the value of environment variable VAR, as a string.\n\ |
| 757 | VAR should be a string. Value is nil if VAR is undefined in the environment.\n\ |
| 758 | This function consults the variable ``process-environment'' for its value.") |
| 759 | (var) |
| 760 | Lisp_Object var; |
| 761 | { |
| 762 | char *value; |
| 763 | int valuelen; |
| 764 | |
| 765 | CHECK_STRING (var, 0); |
| 766 | if (getenv_internal (XSTRING (var)->data, XSTRING (var)->size, |
| 767 | &value, &valuelen)) |
| 768 | return make_string (value, valuelen); |
| 769 | else |
| 770 | return Qnil; |
| 771 | } |
| 772 | |
| 773 | /* A version of getenv that consults process_environment, easily |
| 774 | callable from C. */ |
| 775 | char * |
| 776 | egetenv (var) |
| 777 | char *var; |
| 778 | { |
| 779 | char *value; |
| 780 | int valuelen; |
| 781 | |
| 782 | if (getenv_internal (var, strlen (var), &value, &valuelen)) |
| 783 | return value; |
| 784 | else |
| 785 | return 0; |
| 786 | } |
| 787 | |
| 788 | #endif /* not VMS */ |
| 789 | \f |
| 790 | /* This is run before init_cmdargs. */ |
| 791 | |
| 792 | init_callproc_1 () |
| 793 | { |
| 794 | char *data_dir = egetenv ("EMACSDATA"); |
| 795 | char *doc_dir = egetenv ("EMACSDOC"); |
| 796 | |
| 797 | Vdata_directory |
| 798 | = Ffile_name_as_directory (build_string (data_dir ? data_dir |
| 799 | : PATH_DATA)); |
| 800 | Vdoc_directory |
| 801 | = Ffile_name_as_directory (build_string (doc_dir ? doc_dir |
| 802 | : PATH_DOC)); |
| 803 | |
| 804 | /* Check the EMACSPATH environment variable, defaulting to the |
| 805 | PATH_EXEC path from paths.h. */ |
| 806 | Vexec_path = decode_env_path ("EMACSPATH", PATH_EXEC); |
| 807 | Vexec_directory = Ffile_name_as_directory (Fcar (Vexec_path)); |
| 808 | Vexec_path = nconc2 (decode_env_path ("PATH", ""), Vexec_path); |
| 809 | } |
| 810 | |
| 811 | /* This is run after init_cmdargs, so that Vinvocation_directory is valid. */ |
| 812 | |
| 813 | init_callproc () |
| 814 | { |
| 815 | char *data_dir = egetenv ("EMACSDATA"); |
| 816 | |
| 817 | register char * sh; |
| 818 | Lisp_Object tempdir; |
| 819 | |
| 820 | if (initialized && !NILP (Vinstallation_directory)) |
| 821 | { |
| 822 | /* Add to the path the lib-src subdir of the installation dir. */ |
| 823 | Lisp_Object tem; |
| 824 | tem = Fexpand_file_name (build_string ("lib-src"), |
| 825 | Vinstallation_directory); |
| 826 | if (NILP (Fmember (tem, Vexec_path))) |
| 827 | { |
| 828 | Vexec_path = nconc2 (Vexec_path, Fcons (tem, Qnil)); |
| 829 | Vexec_directory = Ffile_name_as_directory (tem); |
| 830 | |
| 831 | /* If we use ../lib-src, maybe use ../etc as well. |
| 832 | Do so if ../etc exists and has our DOC-... file in it. */ |
| 833 | if (data_dir == 0) |
| 834 | { |
| 835 | tem = Fexpand_file_name (build_string ("etc"), |
| 836 | Vinstallation_directory); |
| 837 | Vdoc_directory = Vdata_directory = Ffile_name_as_directory (tem); |
| 838 | } |
| 839 | } |
| 840 | } |
| 841 | |
| 842 | tempdir = Fdirectory_file_name (Vexec_directory); |
| 843 | if (access (XSTRING (tempdir)->data, 0) < 0) |
| 844 | { |
| 845 | fprintf (stderr, |
| 846 | "Warning: arch-dependent data dir (%s) does not exist.\n", |
| 847 | XSTRING (Vexec_directory)->data); |
| 848 | sleep (2); |
| 849 | } |
| 850 | |
| 851 | tempdir = Fdirectory_file_name (Vdata_directory); |
| 852 | if (access (XSTRING (tempdir)->data, 0) < 0) |
| 853 | { |
| 854 | fprintf (stderr, |
| 855 | "Warning: arch-independent data dir (%s) does not exist.\n", |
| 856 | XSTRING (Vdata_directory)->data); |
| 857 | sleep (2); |
| 858 | } |
| 859 | |
| 860 | #ifdef VMS |
| 861 | Vshell_file_name = build_string ("*dcl*"); |
| 862 | #else |
| 863 | sh = (char *) getenv ("SHELL"); |
| 864 | Vshell_file_name = build_string (sh ? sh : "/bin/sh"); |
| 865 | #endif |
| 866 | } |
| 867 | |
| 868 | set_process_environment () |
| 869 | { |
| 870 | register char **envp; |
| 871 | |
| 872 | Vprocess_environment = Qnil; |
| 873 | #ifndef CANNOT_DUMP |
| 874 | if (initialized) |
| 875 | #endif |
| 876 | for (envp = environ; *envp; envp++) |
| 877 | Vprocess_environment = Fcons (build_string (*envp), |
| 878 | Vprocess_environment); |
| 879 | } |
| 880 | |
| 881 | syms_of_callproc () |
| 882 | { |
| 883 | #ifdef MSDOS |
| 884 | DEFVAR_LISP ("binary-process", &Vbinary_process, |
| 885 | "*If non-nil then new subprocesses are assumed to produce binary output."); |
| 886 | Vbinary_process = Qnil; |
| 887 | #endif |
| 888 | |
| 889 | DEFVAR_LISP ("shell-file-name", &Vshell_file_name, |
| 890 | "*File name to load inferior shells from.\n\ |
| 891 | Initialized from the SHELL environment variable."); |
| 892 | |
| 893 | DEFVAR_LISP ("exec-path", &Vexec_path, |
| 894 | "*List of directories to search programs to run in subprocesses.\n\ |
| 895 | Each element is a string (directory name) or nil (try default directory)."); |
| 896 | |
| 897 | DEFVAR_LISP ("exec-directory", &Vexec_directory, |
| 898 | "Directory of architecture-dependent files that come with GNU Emacs,\n\ |
| 899 | especially executable programs intended for Emacs to invoke."); |
| 900 | |
| 901 | DEFVAR_LISP ("data-directory", &Vdata_directory, |
| 902 | "Directory of architecture-independent files that come with GNU Emacs,\n\ |
| 903 | intended for Emacs to use."); |
| 904 | |
| 905 | DEFVAR_LISP ("doc-directory", &Vdoc_directory, |
| 906 | "Directory containing the DOC file that comes with GNU Emacs.\n\ |
| 907 | This is usually the same as data-directory."); |
| 908 | |
| 909 | DEFVAR_LISP ("configure-info-directory", &Vconfigure_info_directory, |
| 910 | "For internal use by the build procedure only.\n\ |
| 911 | This is the name of the directory in which the build procedure installed\n\ |
| 912 | Emacs's info files; the default value for Info-default-directory-list\n\ |
| 913 | includes this."); |
| 914 | Vconfigure_info_directory = build_string (PATH_INFO); |
| 915 | |
| 916 | DEFVAR_LISP ("process-environment", &Vprocess_environment, |
| 917 | "List of environment variables for subprocesses to inherit.\n\ |
| 918 | Each element should be a string of the form ENVVARNAME=VALUE.\n\ |
| 919 | The environment which Emacs inherits is placed in this variable\n\ |
| 920 | when Emacs starts."); |
| 921 | |
| 922 | #ifndef VMS |
| 923 | defsubr (&Scall_process); |
| 924 | defsubr (&Sgetenv); |
| 925 | #endif |
| 926 | defsubr (&Scall_process_region); |
| 927 | } |