| 1 | /* Asynchronous subprocess control for GNU Emacs. |
| 2 | Copyright (C) 1985, 1986, 1987, 1988, 1993 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 | |
| 23 | #include "config.h" |
| 24 | |
| 25 | /* This file is split into two parts by the following preprocessor |
| 26 | conditional. The 'then' clause contains all of the support for |
| 27 | asynchronous subprocesses. The 'else' clause contains stub |
| 28 | versions of some of the asynchronous subprocess routines that are |
| 29 | often called elsewhere in Emacs, so we don't have to #ifdef the |
| 30 | sections that call them. */ |
| 31 | |
| 32 | \f |
| 33 | #ifdef subprocesses |
| 34 | |
| 35 | #include <stdio.h> |
| 36 | #include <errno.h> |
| 37 | #include <setjmp.h> |
| 38 | #include <sys/types.h> /* some typedefs are used in sys/file.h */ |
| 39 | #include <sys/file.h> |
| 40 | #include <sys/stat.h> |
| 41 | |
| 42 | #ifdef HAVE_SOCKETS /* TCP connection support, if kernel can do it */ |
| 43 | #include <sys/socket.h> |
| 44 | #include <netdb.h> |
| 45 | #include <netinet/in.h> |
| 46 | #include <arpa/inet.h> |
| 47 | #endif /* HAVE_SOCKETS */ |
| 48 | |
| 49 | #if defined(BSD) || defined(STRIDE) |
| 50 | #include <sys/ioctl.h> |
| 51 | #if !defined (O_NDELAY) && defined (HAVE_PTYS) && !defined(USG5) |
| 52 | #include <fcntl.h> |
| 53 | #endif /* HAVE_PTYS and no O_NDELAY */ |
| 54 | #endif /* BSD or STRIDE */ |
| 55 | |
| 56 | #ifdef NEED_BSDTTY |
| 57 | #include <bsdtty.h> |
| 58 | #endif |
| 59 | |
| 60 | #ifdef IRIS |
| 61 | #include <sys/sysmacros.h> /* for "minor" */ |
| 62 | #endif /* not IRIS */ |
| 63 | |
| 64 | #include "systime.h" |
| 65 | #include "systty.h" |
| 66 | |
| 67 | #include "lisp.h" |
| 68 | #include "window.h" |
| 69 | #include "buffer.h" |
| 70 | #include "process.h" |
| 71 | #include "termhooks.h" |
| 72 | #include "termopts.h" |
| 73 | #include "commands.h" |
| 74 | #include "frame.h" |
| 75 | |
| 76 | Lisp_Object Qrun, Qstop, Qsignal, Qopen, Qclosed; |
| 77 | /* Qexit is declared and initialized in eval.c. */ |
| 78 | |
| 79 | /* a process object is a network connection when its childp field is neither |
| 80 | Qt nor Qnil but is instead a string (name of foreign host we |
| 81 | are connected to + name of port we are connected to) */ |
| 82 | |
| 83 | #ifdef HAVE_SOCKETS |
| 84 | static Lisp_Object stream_process; |
| 85 | |
| 86 | #define NETCONN_P(p) (XGCTYPE (XPROCESS (p)->childp) == Lisp_String) |
| 87 | #else |
| 88 | #define NETCONN_P(p) 0 |
| 89 | #endif /* HAVE_SOCKETS */ |
| 90 | |
| 91 | /* Define first descriptor number available for subprocesses. */ |
| 92 | #ifdef VMS |
| 93 | #define FIRST_PROC_DESC 1 |
| 94 | #else /* Not VMS */ |
| 95 | #define FIRST_PROC_DESC 3 |
| 96 | #endif |
| 97 | |
| 98 | /* Define SIGCHLD as an alias for SIGCLD. There are many conditionals |
| 99 | testing SIGCHLD. */ |
| 100 | |
| 101 | #if !defined (SIGCHLD) && defined (SIGCLD) |
| 102 | #define SIGCHLD SIGCLD |
| 103 | #endif /* SIGCLD */ |
| 104 | |
| 105 | #include "syssignal.h" |
| 106 | |
| 107 | /* Define the structure that the wait system call stores. |
| 108 | On many systems, there is a structure defined for this. |
| 109 | But on vanilla-ish USG systems there is not. */ |
| 110 | |
| 111 | #ifndef VMS |
| 112 | #ifndef WAITTYPE |
| 113 | #if (!defined (BSD) && !defined (UNIPLUS) && !defined (STRIDE) && !(defined (HPUX) && !defined (NOMULTIPLEJOBS)) && !defined (HAVE_WAIT_HEADER)) || defined (LINUX) |
| 114 | #define WAITTYPE int |
| 115 | #define WIFSTOPPED(w) ((w&0377) == 0177) |
| 116 | #define WIFSIGNALED(w) ((w&0377) != 0177 && (w&~0377) == 0) |
| 117 | #define WIFEXITED(w) ((w&0377) == 0) |
| 118 | #define WRETCODE(w) (w >> 8) |
| 119 | #define WSTOPSIG(w) (w >> 8) |
| 120 | #define WTERMSIG(w) (w & 0377) |
| 121 | #ifndef WCOREDUMP |
| 122 | #define WCOREDUMP(w) ((w&0200) != 0) |
| 123 | #endif |
| 124 | #else |
| 125 | #ifdef BSD4_1 |
| 126 | #include <wait.h> |
| 127 | #else |
| 128 | #include <sys/wait.h> |
| 129 | #endif /* not BSD 4.1 */ |
| 130 | |
| 131 | #define WAITTYPE union wait |
| 132 | #define WRETCODE(w) w.w_retcode |
| 133 | #define WCOREDUMP(w) w.w_coredump |
| 134 | |
| 135 | #ifdef HPUX |
| 136 | /* HPUX version 7 has broken definitions of these. */ |
| 137 | #undef WTERMSIG |
| 138 | #undef WSTOPSIG |
| 139 | #undef WIFSTOPPED |
| 140 | #undef WIFSIGNALED |
| 141 | #undef WIFEXITED |
| 142 | #endif |
| 143 | |
| 144 | #ifndef WTERMSIG |
| 145 | #define WTERMSIG(w) w.w_termsig |
| 146 | #endif |
| 147 | #ifndef WSTOPSIG |
| 148 | #define WSTOPSIG(w) w.w_stopsig |
| 149 | #endif |
| 150 | #ifndef WIFSTOPPED |
| 151 | #define WIFSTOPPED(w) (WTERMSIG (w) == 0177) |
| 152 | #endif |
| 153 | #ifndef WIFSIGNALED |
| 154 | #define WIFSIGNALED(w) (WTERMSIG (w) != 0177 && (WSTOPSIG (w)) == 0) |
| 155 | #endif |
| 156 | #ifndef WIFEXITED |
| 157 | #define WIFEXITED(w) (WTERMSIG (w) == 0) |
| 158 | #endif |
| 159 | #endif /* BSD or UNIPLUS or STRIDE */ |
| 160 | #endif /* no WAITTYPE */ |
| 161 | #else /* VMS */ |
| 162 | #define WAITTYPE int |
| 163 | #define WIFSTOPPED(w) 0 |
| 164 | #define WIFSIGNALED(w) 0 |
| 165 | #define WIFEXITED(w) ((w) != -1) |
| 166 | #define WRETCODE(w) (w) |
| 167 | #define WSTOPSIG(w) (w) |
| 168 | #define WCOREDUMP(w) 0 |
| 169 | #define WTERMSIG(w) (w) |
| 170 | #include <ssdef.h> |
| 171 | #include <iodef.h> |
| 172 | #include <clidef.h> |
| 173 | #include "vmsproc.h" |
| 174 | #endif /* VMS */ |
| 175 | |
| 176 | extern errno; |
| 177 | extern sys_nerr; |
| 178 | extern char *sys_errlist[]; |
| 179 | |
| 180 | #ifndef VMS |
| 181 | #ifndef BSD4_1 |
| 182 | #ifndef LINUX |
| 183 | extern char *sys_siglist[]; |
| 184 | #endif |
| 185 | #else |
| 186 | char *sys_siglist[] = |
| 187 | { |
| 188 | "bum signal!!", |
| 189 | "hangup", |
| 190 | "interrupt", |
| 191 | "quit", |
| 192 | "illegal instruction", |
| 193 | "trace trap", |
| 194 | "iot instruction", |
| 195 | "emt instruction", |
| 196 | "floating point exception", |
| 197 | "kill", |
| 198 | "bus error", |
| 199 | "segmentation violation", |
| 200 | "bad argument to system call", |
| 201 | "write on a pipe with no one to read it", |
| 202 | "alarm clock", |
| 203 | "software termination signal from kill", |
| 204 | "status signal", |
| 205 | "sendable stop signal not from tty", |
| 206 | "stop signal from tty", |
| 207 | "continue a stopped process", |
| 208 | "child status has changed", |
| 209 | "background read attempted from control tty", |
| 210 | "background write attempted from control tty", |
| 211 | "input record available at control tty", |
| 212 | "exceeded CPU time limit", |
| 213 | "exceeded file size limit" |
| 214 | }; |
| 215 | #endif |
| 216 | #endif /* VMS */ |
| 217 | |
| 218 | /* t means use pty, nil means use a pipe, |
| 219 | maybe other values to come. */ |
| 220 | Lisp_Object Vprocess_connection_type; |
| 221 | |
| 222 | #ifdef SKTPAIR |
| 223 | #ifndef HAVE_SOCKETS |
| 224 | #include <sys/socket.h> |
| 225 | #endif |
| 226 | #endif /* SKTPAIR */ |
| 227 | |
| 228 | /* Number of events of change of status of a process. */ |
| 229 | int process_tick; |
| 230 | |
| 231 | /* Number of events for which the user or sentinel has been notified. */ |
| 232 | int update_tick; |
| 233 | |
| 234 | #ifdef FD_SET |
| 235 | /* We could get this from param.h, but better not to depend on finding that. |
| 236 | And better not to risk that it might define other symbols used in this |
| 237 | file. */ |
| 238 | #ifdef FD_SETSIZE |
| 239 | #define MAXDESC FD_SETSIZE |
| 240 | #else |
| 241 | #define MAXDESC 64 |
| 242 | #endif |
| 243 | #define SELECT_TYPE fd_set |
| 244 | #else /* no FD_SET */ |
| 245 | #define MAXDESC 32 |
| 246 | #define SELECT_TYPE int |
| 247 | |
| 248 | /* Define the macros to access a single-int bitmap of descriptors. */ |
| 249 | #define FD_SET(n, p) (*(p) |= (1 << (n))) |
| 250 | #define FD_CLR(n, p) (*(p) &= ~(1 << (n))) |
| 251 | #define FD_ISSET(n, p) (*(p) & (1 << (n))) |
| 252 | #define FD_ZERO(p) (*(p) = 0) |
| 253 | #endif /* no FD_SET */ |
| 254 | |
| 255 | /* Mask of bits indicating the descriptors that we wait for input on */ |
| 256 | |
| 257 | SELECT_TYPE input_wait_mask; |
| 258 | |
| 259 | int delete_exited_processes; |
| 260 | |
| 261 | /* Indexed by descriptor, gives the process (if any) for that descriptor */ |
| 262 | Lisp_Object chan_process[MAXDESC]; |
| 263 | |
| 264 | /* Alist of elements (NAME . PROCESS) */ |
| 265 | Lisp_Object Vprocess_alist; |
| 266 | |
| 267 | Lisp_Object Qprocessp; |
| 268 | |
| 269 | Lisp_Object get_process (); |
| 270 | |
| 271 | /* Buffered-ahead input char from process, indexed by channel. |
| 272 | -1 means empty (no char is buffered). |
| 273 | Used on sys V where the only way to tell if there is any |
| 274 | output from the process is to read at least one char. |
| 275 | Always -1 on systems that support FIONREAD. */ |
| 276 | |
| 277 | int proc_buffered_char[MAXDESC]; |
| 278 | \f |
| 279 | /* Compute the Lisp form of the process status, p->status, from |
| 280 | the numeric status that was returned by `wait'. */ |
| 281 | |
| 282 | Lisp_Object status_convert (); |
| 283 | |
| 284 | update_status (p) |
| 285 | struct Lisp_Process *p; |
| 286 | { |
| 287 | union { int i; WAITTYPE wt; } u; |
| 288 | u.i = XFASTINT (p->raw_status_low) + (XFASTINT (p->raw_status_high) << 16); |
| 289 | p->status = status_convert (u.wt); |
| 290 | p->raw_status_low = Qnil; |
| 291 | p->raw_status_high = Qnil; |
| 292 | } |
| 293 | |
| 294 | /* Convert a process status word in Unix format to |
| 295 | the list that we use internally. */ |
| 296 | |
| 297 | Lisp_Object |
| 298 | status_convert (w) |
| 299 | WAITTYPE w; |
| 300 | { |
| 301 | if (WIFSTOPPED (w)) |
| 302 | return Fcons (Qstop, Fcons (make_number (WSTOPSIG (w)), Qnil)); |
| 303 | else if (WIFEXITED (w)) |
| 304 | return Fcons (Qexit, Fcons (make_number (WRETCODE (w)), |
| 305 | WCOREDUMP (w) ? Qt : Qnil)); |
| 306 | else if (WIFSIGNALED (w)) |
| 307 | return Fcons (Qsignal, Fcons (make_number (WTERMSIG (w)), |
| 308 | WCOREDUMP (w) ? Qt : Qnil)); |
| 309 | else |
| 310 | return Qrun; |
| 311 | } |
| 312 | |
| 313 | /* Given a status-list, extract the three pieces of information |
| 314 | and store them individually through the three pointers. */ |
| 315 | |
| 316 | void |
| 317 | decode_status (l, symbol, code, coredump) |
| 318 | Lisp_Object l; |
| 319 | Lisp_Object *symbol; |
| 320 | int *code; |
| 321 | int *coredump; |
| 322 | { |
| 323 | Lisp_Object tem; |
| 324 | |
| 325 | if (XTYPE (l) == Lisp_Symbol) |
| 326 | { |
| 327 | *symbol = l; |
| 328 | *code = 0; |
| 329 | *coredump = 0; |
| 330 | } |
| 331 | else |
| 332 | { |
| 333 | *symbol = XCONS (l)->car; |
| 334 | tem = XCONS (l)->cdr; |
| 335 | *code = XFASTINT (XCONS (tem)->car); |
| 336 | tem = XCONS (tem)->cdr; |
| 337 | *coredump = !NILP (tem); |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | /* Return a string describing a process status list. */ |
| 342 | |
| 343 | Lisp_Object |
| 344 | status_message (status) |
| 345 | Lisp_Object status; |
| 346 | { |
| 347 | Lisp_Object symbol; |
| 348 | int code, coredump; |
| 349 | Lisp_Object string, string2; |
| 350 | |
| 351 | decode_status (status, &symbol, &code, &coredump); |
| 352 | |
| 353 | if (EQ (symbol, Qsignal) || EQ (symbol, Qstop)) |
| 354 | { |
| 355 | #ifndef VMS |
| 356 | string = build_string (code < NSIG ? sys_siglist[code] : "unknown"); |
| 357 | #else |
| 358 | string = build_string (code < NSIG ? sys_errlist[code] : "unknown"); |
| 359 | #endif |
| 360 | string2 = build_string (coredump ? " (core dumped)\n" : "\n"); |
| 361 | XSTRING (string)->data[0] = DOWNCASE (XSTRING (string)->data[0]); |
| 362 | return concat2 (string, string2); |
| 363 | } |
| 364 | else if (EQ (symbol, Qexit)) |
| 365 | { |
| 366 | if (code == 0) |
| 367 | return build_string ("finished\n"); |
| 368 | string = Fnumber_to_string (make_number (code)); |
| 369 | string2 = build_string (coredump ? " (core dumped)\n" : "\n"); |
| 370 | return concat2 (build_string ("exited abnormally with code "), |
| 371 | concat2 (string, string2)); |
| 372 | } |
| 373 | else |
| 374 | return Fcopy_sequence (Fsymbol_name (symbol)); |
| 375 | } |
| 376 | \f |
| 377 | #ifdef HAVE_PTYS |
| 378 | |
| 379 | /* Open an available pty, returning a file descriptor. |
| 380 | Return -1 on failure. |
| 381 | The file name of the terminal corresponding to the pty |
| 382 | is left in the variable pty_name. */ |
| 383 | |
| 384 | char pty_name[24]; |
| 385 | |
| 386 | int |
| 387 | allocate_pty () |
| 388 | { |
| 389 | struct stat stb; |
| 390 | register c, i; |
| 391 | int fd; |
| 392 | |
| 393 | /* Some systems name their pseudoterminals so that there are gaps in |
| 394 | the usual sequence - for example, on HP9000/S700 systems, there |
| 395 | are no pseudoterminals with names ending in 'f'. So we wait for |
| 396 | three failures in a row before deciding that we've reached the |
| 397 | end of the ptys. */ |
| 398 | int failed_count = 0; |
| 399 | |
| 400 | #ifdef PTY_ITERATION |
| 401 | PTY_ITERATION |
| 402 | #else |
| 403 | for (c = FIRST_PTY_LETTER; c <= 'z'; c++) |
| 404 | for (i = 0; i < 16; i++) |
| 405 | #endif |
| 406 | { |
| 407 | #ifdef PTY_NAME_SPRINTF |
| 408 | PTY_NAME_SPRINTF |
| 409 | #else |
| 410 | sprintf (pty_name, "/dev/pty%c%x", c, i); |
| 411 | #endif /* no PTY_NAME_SPRINTF */ |
| 412 | |
| 413 | #ifdef PTY_OPEN |
| 414 | PTY_OPEN; |
| 415 | #else /* no PTY_OPEN */ |
| 416 | #ifdef IRIS |
| 417 | /* Unusual IRIS code */ |
| 418 | *ptyv = open ("/dev/ptc", O_RDWR | O_NDELAY, 0); |
| 419 | if (fd < 0) |
| 420 | return -1; |
| 421 | if (fstat (fd, &stb) < 0) |
| 422 | return -1; |
| 423 | #else /* not IRIS */ |
| 424 | if (stat (pty_name, &stb) < 0) |
| 425 | { |
| 426 | failed_count++; |
| 427 | if (failed_count >= 3) |
| 428 | return -1; |
| 429 | } |
| 430 | else |
| 431 | failed_count = 0; |
| 432 | #ifdef O_NONBLOCK |
| 433 | fd = open (pty_name, O_RDWR | O_NONBLOCK, 0); |
| 434 | #else |
| 435 | fd = open (pty_name, O_RDWR | O_NDELAY, 0); |
| 436 | #endif |
| 437 | #endif /* not IRIS */ |
| 438 | #endif /* no PTY_OPEN */ |
| 439 | |
| 440 | if (fd >= 0) |
| 441 | { |
| 442 | /* check to make certain that both sides are available |
| 443 | this avoids a nasty yet stupid bug in rlogins */ |
| 444 | #ifdef PTY_TTY_NAME_SPRINTF |
| 445 | PTY_TTY_NAME_SPRINTF |
| 446 | #else |
| 447 | sprintf (pty_name, "/dev/tty%c%x", c, i); |
| 448 | #endif /* no PTY_TTY_NAME_SPRINTF */ |
| 449 | #ifndef UNIPLUS |
| 450 | if (access (pty_name, 6) != 0) |
| 451 | { |
| 452 | close (fd); |
| 453 | #if !defined(IRIS) && !defined(__sgi) |
| 454 | continue; |
| 455 | #else |
| 456 | return -1; |
| 457 | #endif /* IRIS */ |
| 458 | } |
| 459 | #endif /* not UNIPLUS */ |
| 460 | setup_pty (fd); |
| 461 | return fd; |
| 462 | } |
| 463 | } |
| 464 | return -1; |
| 465 | } |
| 466 | #endif /* HAVE_PTYS */ |
| 467 | \f |
| 468 | Lisp_Object |
| 469 | make_process (name) |
| 470 | Lisp_Object name; |
| 471 | { |
| 472 | register Lisp_Object val, tem, name1; |
| 473 | register struct Lisp_Process *p; |
| 474 | char suffix[10]; |
| 475 | register int i; |
| 476 | |
| 477 | /* size of process structure includes the vector header, |
| 478 | so deduct for that. But struct Lisp_Vector includes the first |
| 479 | element, thus deducts too much, so add it back. */ |
| 480 | val = Fmake_vector (make_number ((sizeof (struct Lisp_Process) |
| 481 | - sizeof (struct Lisp_Vector) |
| 482 | + sizeof (Lisp_Object)) |
| 483 | / sizeof (Lisp_Object)), |
| 484 | Qnil); |
| 485 | XSETTYPE (val, Lisp_Process); |
| 486 | |
| 487 | p = XPROCESS (val); |
| 488 | XFASTINT (p->infd) = 0; |
| 489 | XFASTINT (p->outfd) = 0; |
| 490 | XFASTINT (p->pid) = 0; |
| 491 | XFASTINT (p->tick) = 0; |
| 492 | XFASTINT (p->update_tick) = 0; |
| 493 | p->raw_status_low = Qnil; |
| 494 | p->raw_status_high = Qnil; |
| 495 | p->status = Qrun; |
| 496 | p->mark = Fmake_marker (); |
| 497 | |
| 498 | /* If name is already in use, modify it until it is unused. */ |
| 499 | |
| 500 | name1 = name; |
| 501 | for (i = 1; ; i++) |
| 502 | { |
| 503 | tem = Fget_process (name1); |
| 504 | if (NILP (tem)) break; |
| 505 | sprintf (suffix, "<%d>", i); |
| 506 | name1 = concat2 (name, build_string (suffix)); |
| 507 | } |
| 508 | name = name1; |
| 509 | p->name = name; |
| 510 | Vprocess_alist = Fcons (Fcons (name, val), Vprocess_alist); |
| 511 | return val; |
| 512 | } |
| 513 | |
| 514 | remove_process (proc) |
| 515 | register Lisp_Object proc; |
| 516 | { |
| 517 | register Lisp_Object pair; |
| 518 | |
| 519 | pair = Frassq (proc, Vprocess_alist); |
| 520 | Vprocess_alist = Fdelq (pair, Vprocess_alist); |
| 521 | Fset_marker (XPROCESS (proc)->mark, Qnil, Qnil); |
| 522 | |
| 523 | deactivate_process (proc); |
| 524 | } |
| 525 | \f |
| 526 | DEFUN ("processp", Fprocessp, Sprocessp, 1, 1, 0, |
| 527 | "Return t if OBJECT is a process.") |
| 528 | (obj) |
| 529 | Lisp_Object obj; |
| 530 | { |
| 531 | return XTYPE (obj) == Lisp_Process ? Qt : Qnil; |
| 532 | } |
| 533 | |
| 534 | DEFUN ("get-process", Fget_process, Sget_process, 1, 1, 0, |
| 535 | "Return the process named NAME, or nil if there is none.") |
| 536 | (name) |
| 537 | register Lisp_Object name; |
| 538 | { |
| 539 | if (XTYPE (name) == Lisp_Process) |
| 540 | return name; |
| 541 | CHECK_STRING (name, 0); |
| 542 | return Fcdr (Fassoc (name, Vprocess_alist)); |
| 543 | } |
| 544 | |
| 545 | DEFUN ("get-buffer-process", Fget_buffer_process, Sget_buffer_process, 1, 1, 0, |
| 546 | "Return the (or, a) process associated with BUFFER.\n\ |
| 547 | BUFFER may be a buffer or the name of one.") |
| 548 | (name) |
| 549 | register Lisp_Object name; |
| 550 | { |
| 551 | register Lisp_Object buf, tail, proc; |
| 552 | |
| 553 | if (NILP (name)) return Qnil; |
| 554 | buf = Fget_buffer (name); |
| 555 | if (NILP (buf)) return Qnil; |
| 556 | |
| 557 | for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail)) |
| 558 | { |
| 559 | proc = Fcdr (Fcar (tail)); |
| 560 | if (XTYPE (proc) == Lisp_Process && EQ (XPROCESS (proc)->buffer, buf)) |
| 561 | return proc; |
| 562 | } |
| 563 | return Qnil; |
| 564 | } |
| 565 | |
| 566 | /* This is how commands for the user decode process arguments. It |
| 567 | accepts a process, a process name, a buffer, a buffer name, or nil. |
| 568 | Buffers denote the first process in the buffer, and nil denotes the |
| 569 | current buffer. */ |
| 570 | |
| 571 | Lisp_Object |
| 572 | get_process (name) |
| 573 | register Lisp_Object name; |
| 574 | { |
| 575 | register Lisp_Object proc; |
| 576 | if (NILP (name)) |
| 577 | proc = Fget_buffer_process (Fcurrent_buffer ()); |
| 578 | else |
| 579 | { |
| 580 | proc = Fget_process (name); |
| 581 | if (NILP (proc)) |
| 582 | proc = Fget_buffer_process (Fget_buffer (name)); |
| 583 | } |
| 584 | |
| 585 | if (!NILP (proc)) |
| 586 | return proc; |
| 587 | |
| 588 | if (NILP (name)) |
| 589 | error ("Current buffer has no process"); |
| 590 | else |
| 591 | error ("Process %s does not exist", XSTRING (name)->data); |
| 592 | /* NOTREACHED */ |
| 593 | } |
| 594 | |
| 595 | DEFUN ("delete-process", Fdelete_process, Sdelete_process, 1, 1, 0, |
| 596 | "Delete PROCESS: kill it and forget about it immediately.\n\ |
| 597 | PROCESS may be a process, a buffer, the name of a process or buffer, or\n\ |
| 598 | nil, indicating the current buffer's process.") |
| 599 | (proc) |
| 600 | register Lisp_Object proc; |
| 601 | { |
| 602 | proc = get_process (proc); |
| 603 | XPROCESS (proc)->raw_status_low = Qnil; |
| 604 | XPROCESS (proc)->raw_status_high = Qnil; |
| 605 | if (NETCONN_P (proc)) |
| 606 | { |
| 607 | XPROCESS (proc)->status = Fcons (Qexit, Fcons (make_number (0), Qnil)); |
| 608 | XSETINT (XPROCESS (proc)->tick, ++process_tick); |
| 609 | } |
| 610 | else if (XFASTINT (XPROCESS (proc)->infd)) |
| 611 | { |
| 612 | Fkill_process (proc, Qnil); |
| 613 | /* Do this now, since remove_process will make sigchld_handler do nothing. */ |
| 614 | XPROCESS (proc)->status |
| 615 | = Fcons (Qsignal, Fcons (make_number (SIGKILL), Qnil)); |
| 616 | XSETINT (XPROCESS (proc)->tick, ++process_tick); |
| 617 | status_notify (); |
| 618 | } |
| 619 | remove_process (proc); |
| 620 | return Qnil; |
| 621 | } |
| 622 | \f |
| 623 | DEFUN ("process-status", Fprocess_status, Sprocess_status, 1, 1, 0, |
| 624 | "Return the status of PROCESS: a symbol, one of these:\n\ |
| 625 | run -- for a process that is running.\n\ |
| 626 | stop -- for a process stopped but continuable.\n\ |
| 627 | exit -- for a process that has exited.\n\ |
| 628 | signal -- for a process that has got a fatal signal.\n\ |
| 629 | open -- for a network stream connection that is open.\n\ |
| 630 | closed -- for a network stream connection that is closed.\n\ |
| 631 | nil -- if arg is a process name and no such process exists.\n\ |
| 632 | PROCESS may be a process, a buffer, the name of a process or buffer, or\n\ |
| 633 | nil, indicating the current buffer's process.") |
| 634 | /* command -- for a command channel opened to Emacs by another process.\n\ |
| 635 | external -- for an i/o channel opened to Emacs by another process.\n\ */ |
| 636 | (proc) |
| 637 | register Lisp_Object proc; |
| 638 | { |
| 639 | register struct Lisp_Process *p; |
| 640 | register Lisp_Object status; |
| 641 | proc = get_process (proc); |
| 642 | if (NILP (proc)) |
| 643 | return proc; |
| 644 | p = XPROCESS (proc); |
| 645 | if (!NILP (p->raw_status_low)) |
| 646 | update_status (p); |
| 647 | status = p->status; |
| 648 | if (XTYPE (status) == Lisp_Cons) |
| 649 | status = XCONS (status)->car; |
| 650 | if (NETCONN_P (proc)) |
| 651 | { |
| 652 | if (EQ (status, Qrun)) |
| 653 | status = Qopen; |
| 654 | else if (EQ (status, Qexit)) |
| 655 | status = Qclosed; |
| 656 | } |
| 657 | return status; |
| 658 | } |
| 659 | |
| 660 | DEFUN ("process-exit-status", Fprocess_exit_status, Sprocess_exit_status, |
| 661 | 1, 1, 0, |
| 662 | "Return the exit status of PROCESS or the signal number that killed it.\n\ |
| 663 | If PROCESS has not yet exited or died, return 0.") |
| 664 | (proc) |
| 665 | register Lisp_Object proc; |
| 666 | { |
| 667 | CHECK_PROCESS (proc, 0); |
| 668 | if (!NILP (XPROCESS (proc)->raw_status_low)) |
| 669 | update_status (XPROCESS (proc)); |
| 670 | if (XTYPE (XPROCESS (proc)->status) == Lisp_Cons) |
| 671 | return XCONS (XCONS (XPROCESS (proc)->status)->cdr)->car; |
| 672 | return make_number (0); |
| 673 | } |
| 674 | |
| 675 | DEFUN ("process-id", Fprocess_id, Sprocess_id, 1, 1, 0, |
| 676 | "Return the process id of PROCESS.\n\ |
| 677 | This is the pid of the Unix process which PROCESS uses or talks to.\n\ |
| 678 | For a network connection, this value is nil.") |
| 679 | (proc) |
| 680 | register Lisp_Object proc; |
| 681 | { |
| 682 | CHECK_PROCESS (proc, 0); |
| 683 | return XPROCESS (proc)->pid; |
| 684 | } |
| 685 | |
| 686 | DEFUN ("process-name", Fprocess_name, Sprocess_name, 1, 1, 0, |
| 687 | "Return the name of PROCESS, as a string.\n\ |
| 688 | This is the name of the program invoked in PROCESS,\n\ |
| 689 | possibly modified to make it unique among process names.") |
| 690 | (proc) |
| 691 | register Lisp_Object proc; |
| 692 | { |
| 693 | CHECK_PROCESS (proc, 0); |
| 694 | return XPROCESS (proc)->name; |
| 695 | } |
| 696 | |
| 697 | DEFUN ("process-command", Fprocess_command, Sprocess_command, 1, 1, 0, |
| 698 | "Return the command that was executed to start PROCESS.\n\ |
| 699 | This is a list of strings, the first string being the program executed\n\ |
| 700 | and the rest of the strings being the arguments given to it.\n\ |
| 701 | For a non-child channel, this is nil.") |
| 702 | (proc) |
| 703 | register Lisp_Object proc; |
| 704 | { |
| 705 | CHECK_PROCESS (proc, 0); |
| 706 | return XPROCESS (proc)->command; |
| 707 | } |
| 708 | |
| 709 | DEFUN ("set-process-buffer", Fset_process_buffer, Sset_process_buffer, |
| 710 | 2, 2, 0, |
| 711 | "Set buffer associated with PROCESS to BUFFER (a buffer, or nil).") |
| 712 | (proc, buffer) |
| 713 | register Lisp_Object proc, buffer; |
| 714 | { |
| 715 | CHECK_PROCESS (proc, 0); |
| 716 | if (!NILP (buffer)) |
| 717 | CHECK_BUFFER (buffer, 1); |
| 718 | XPROCESS (proc)->buffer = buffer; |
| 719 | return buffer; |
| 720 | } |
| 721 | |
| 722 | DEFUN ("process-buffer", Fprocess_buffer, Sprocess_buffer, |
| 723 | 1, 1, 0, |
| 724 | "Return the buffer PROCESS is associated with.\n\ |
| 725 | Output from PROCESS is inserted in this buffer\n\ |
| 726 | unless PROCESS has a filter.") |
| 727 | (proc) |
| 728 | register Lisp_Object proc; |
| 729 | { |
| 730 | CHECK_PROCESS (proc, 0); |
| 731 | return XPROCESS (proc)->buffer; |
| 732 | } |
| 733 | |
| 734 | DEFUN ("process-mark", Fprocess_mark, Sprocess_mark, |
| 735 | 1, 1, 0, |
| 736 | "Return the marker for the end of the last output from PROCESS.") |
| 737 | (proc) |
| 738 | register Lisp_Object proc; |
| 739 | { |
| 740 | CHECK_PROCESS (proc, 0); |
| 741 | return XPROCESS (proc)->mark; |
| 742 | } |
| 743 | |
| 744 | DEFUN ("set-process-filter", Fset_process_filter, Sset_process_filter, |
| 745 | 2, 2, 0, |
| 746 | "Give PROCESS the filter function FILTER; nil means no filter.\n\ |
| 747 | When a process has a filter, each time it does output\n\ |
| 748 | the entire string of output is passed to the filter.\n\ |
| 749 | The filter gets two arguments: the process and the string of output.\n\ |
| 750 | If the process has a filter, its buffer is not used for output.") |
| 751 | (proc, filter) |
| 752 | register Lisp_Object proc, filter; |
| 753 | { |
| 754 | CHECK_PROCESS (proc, 0); |
| 755 | XPROCESS (proc)->filter = filter; |
| 756 | return filter; |
| 757 | } |
| 758 | |
| 759 | DEFUN ("process-filter", Fprocess_filter, Sprocess_filter, |
| 760 | 1, 1, 0, |
| 761 | "Returns the filter function of PROCESS; nil if none.\n\ |
| 762 | See `set-process-filter' for more info on filter functions.") |
| 763 | (proc) |
| 764 | register Lisp_Object proc; |
| 765 | { |
| 766 | CHECK_PROCESS (proc, 0); |
| 767 | return XPROCESS (proc)->filter; |
| 768 | } |
| 769 | |
| 770 | DEFUN ("set-process-sentinel", Fset_process_sentinel, Sset_process_sentinel, |
| 771 | 2, 2, 0, |
| 772 | "Give PROCESS the sentinel SENTINEL; nil for none.\n\ |
| 773 | The sentinel is called as a function when the process changes state.\n\ |
| 774 | It gets two arguments: the process, and a string describing the change.") |
| 775 | (proc, sentinel) |
| 776 | register Lisp_Object proc, sentinel; |
| 777 | { |
| 778 | CHECK_PROCESS (proc, 0); |
| 779 | XPROCESS (proc)->sentinel = sentinel; |
| 780 | return sentinel; |
| 781 | } |
| 782 | |
| 783 | DEFUN ("process-sentinel", Fprocess_sentinel, Sprocess_sentinel, |
| 784 | 1, 1, 0, |
| 785 | "Return the sentinel of PROCESS; nil if none.\n\ |
| 786 | See `set-process-sentinel' for more info on sentinels.") |
| 787 | (proc) |
| 788 | register Lisp_Object proc; |
| 789 | { |
| 790 | CHECK_PROCESS (proc, 0); |
| 791 | return XPROCESS (proc)->sentinel; |
| 792 | } |
| 793 | |
| 794 | DEFUN ("process-kill-without-query", Fprocess_kill_without_query, |
| 795 | Sprocess_kill_without_query, 1, 2, 0, |
| 796 | "Say no query needed if PROCESS is running when Emacs is exited.\n\ |
| 797 | Optional second argument if non-nill says to require a query.\n\ |
| 798 | Value is t if a query was formerly required.") |
| 799 | (proc, value) |
| 800 | register Lisp_Object proc, value; |
| 801 | { |
| 802 | Lisp_Object tem; |
| 803 | |
| 804 | CHECK_PROCESS (proc, 0); |
| 805 | tem = XPROCESS (proc)->kill_without_query; |
| 806 | XPROCESS (proc)->kill_without_query = Fnull (value); |
| 807 | |
| 808 | return Fnull (tem); |
| 809 | } |
| 810 | \f |
| 811 | Lisp_Object |
| 812 | list_processes_1 () |
| 813 | { |
| 814 | register Lisp_Object tail, tem; |
| 815 | Lisp_Object proc, minspace, tem1; |
| 816 | register struct buffer *old = current_buffer; |
| 817 | register struct Lisp_Process *p; |
| 818 | register int state; |
| 819 | char tembuf[80]; |
| 820 | |
| 821 | XFASTINT (minspace) = 1; |
| 822 | |
| 823 | set_buffer_internal (XBUFFER (Vstandard_output)); |
| 824 | Fbuffer_disable_undo (Vstandard_output); |
| 825 | |
| 826 | current_buffer->truncate_lines = Qt; |
| 827 | |
| 828 | write_string ("\ |
| 829 | Proc Status Buffer Command\n\ |
| 830 | ---- ------ ------ -------\n", -1); |
| 831 | |
| 832 | for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail)) |
| 833 | { |
| 834 | Lisp_Object symbol; |
| 835 | |
| 836 | proc = Fcdr (Fcar (tail)); |
| 837 | p = XPROCESS (proc); |
| 838 | if (NILP (p->childp)) |
| 839 | continue; |
| 840 | |
| 841 | Finsert (1, &p->name); |
| 842 | Findent_to (make_number (13), minspace); |
| 843 | |
| 844 | if (!NILP (p->raw_status_low)) |
| 845 | update_status (p); |
| 846 | symbol = p->status; |
| 847 | if (XTYPE (p->status) == Lisp_Cons) |
| 848 | symbol = XCONS (p->status)->car; |
| 849 | |
| 850 | |
| 851 | if (EQ (symbol, Qsignal)) |
| 852 | { |
| 853 | Lisp_Object tem; |
| 854 | tem = Fcar (Fcdr (p->status)); |
| 855 | #ifdef VMS |
| 856 | if (XINT (tem) < NSIG) |
| 857 | write_string (sys_errlist [XINT (tem)], -1); |
| 858 | else |
| 859 | #endif |
| 860 | Fprinc (symbol, Qnil); |
| 861 | } |
| 862 | else if (NETCONN_P (proc)) |
| 863 | { |
| 864 | if (EQ (symbol, Qrun)) |
| 865 | write_string ("open", -1); |
| 866 | else if (EQ (symbol, Qexit)) |
| 867 | write_string ("closed", -1); |
| 868 | else |
| 869 | Fprinc (symbol, Qnil); |
| 870 | } |
| 871 | else |
| 872 | Fprinc (symbol, Qnil); |
| 873 | |
| 874 | if (EQ (symbol, Qexit)) |
| 875 | { |
| 876 | Lisp_Object tem; |
| 877 | tem = Fcar (Fcdr (p->status)); |
| 878 | if (XFASTINT (tem)) |
| 879 | { |
| 880 | sprintf (tembuf, " %d", XFASTINT (tem)); |
| 881 | write_string (tembuf, -1); |
| 882 | } |
| 883 | } |
| 884 | |
| 885 | if (EQ (symbol, Qsignal) || EQ (symbol, Qexit)) |
| 886 | remove_process (proc); |
| 887 | |
| 888 | Findent_to (make_number (22), minspace); |
| 889 | if (NILP (p->buffer)) |
| 890 | insert_string ("(none)"); |
| 891 | else if (NILP (XBUFFER (p->buffer)->name)) |
| 892 | insert_string ("(Killed)"); |
| 893 | else |
| 894 | Finsert (1, &XBUFFER (p->buffer)->name); |
| 895 | |
| 896 | Findent_to (make_number (37), minspace); |
| 897 | |
| 898 | if (NETCONN_P (proc)) |
| 899 | { |
| 900 | sprintf (tembuf, "(network stream connection to %s)\n", |
| 901 | XSTRING (p->childp)->data); |
| 902 | insert_string (tembuf); |
| 903 | } |
| 904 | else |
| 905 | { |
| 906 | tem = p->command; |
| 907 | while (1) |
| 908 | { |
| 909 | tem1 = Fcar (tem); |
| 910 | Finsert (1, &tem1); |
| 911 | tem = Fcdr (tem); |
| 912 | if (NILP (tem)) |
| 913 | break; |
| 914 | insert_string (" "); |
| 915 | } |
| 916 | insert_string ("\n"); |
| 917 | } |
| 918 | } |
| 919 | return Qnil; |
| 920 | } |
| 921 | |
| 922 | DEFUN ("list-processes", Flist_processes, Slist_processes, 0, 0, "", |
| 923 | "Display a list of all processes.\n\ |
| 924 | \(Any processes listed as Exited or Signaled are actually eliminated\n\ |
| 925 | after the listing is made.)") |
| 926 | () |
| 927 | { |
| 928 | internal_with_output_to_temp_buffer ("*Process List*", |
| 929 | list_processes_1, Qnil); |
| 930 | return Qnil; |
| 931 | } |
| 932 | |
| 933 | DEFUN ("process-list", Fprocess_list, Sprocess_list, 0, 0, 0, |
| 934 | "Return a list of all processes.") |
| 935 | () |
| 936 | { |
| 937 | return Fmapcar (Qcdr, Vprocess_alist); |
| 938 | } |
| 939 | \f |
| 940 | /* Starting asynchronous inferior processes. */ |
| 941 | |
| 942 | static Lisp_Object start_process_unwind (); |
| 943 | |
| 944 | DEFUN ("start-process", Fstart_process, Sstart_process, 3, MANY, 0, |
| 945 | "Start a program in a subprocess. Return the process object for it.\n\ |
| 946 | Args are NAME BUFFER PROGRAM &rest PROGRAM-ARGS\n\ |
| 947 | NAME is name for process. It is modified if necessary to make it unique.\n\ |
| 948 | BUFFER is the buffer or (buffer-name) to associate with the process.\n\ |
| 949 | Process output goes at end of that buffer, unless you specify\n\ |
| 950 | an output stream or filter function to handle the output.\n\ |
| 951 | BUFFER may be also nil, meaning that this process is not associated\n\ |
| 952 | with any buffer\n\ |
| 953 | Third arg is program file name. It is searched for as in the shell.\n\ |
| 954 | Remaining arguments are strings to give program as arguments.") |
| 955 | (nargs, args) |
| 956 | int nargs; |
| 957 | register Lisp_Object *args; |
| 958 | { |
| 959 | Lisp_Object buffer, name, program, proc, current_dir, tem; |
| 960 | #ifdef VMS |
| 961 | register unsigned char *new_argv; |
| 962 | int len; |
| 963 | #else |
| 964 | register unsigned char **new_argv; |
| 965 | #endif |
| 966 | register int i; |
| 967 | int count = specpdl_ptr - specpdl; |
| 968 | |
| 969 | buffer = args[1]; |
| 970 | if (!NILP (buffer)) |
| 971 | buffer = Fget_buffer_create (buffer); |
| 972 | |
| 973 | /* Make sure that the child will be able to chdir to the current |
| 974 | buffer's current directory, or its unhandled equivalent. We |
| 975 | can't just have the child check for an error when it does the |
| 976 | chdir, since it's in a vfork. |
| 977 | |
| 978 | We have to GCPRO around this because Fexpand_file_name and |
| 979 | Funhandled_file_name_directory might call a file name handling |
| 980 | function. The argument list is protected by the caller, so all |
| 981 | we really have to worry about is buffer. */ |
| 982 | { |
| 983 | struct gcpro gcpro1, gcpro2; |
| 984 | |
| 985 | current_dir = current_buffer->directory; |
| 986 | |
| 987 | GCPRO2 (buffer, current_dir); |
| 988 | |
| 989 | current_dir = |
| 990 | expand_and_dir_to_file |
| 991 | (Funhandled_file_name_directory (current_dir), Qnil); |
| 992 | if (NILP (Ffile_accessible_directory_p (current_dir))) |
| 993 | report_file_error ("Setting current directory", |
| 994 | Fcons (current_buffer->directory, Qnil)); |
| 995 | |
| 996 | UNGCPRO; |
| 997 | } |
| 998 | |
| 999 | name = args[0]; |
| 1000 | CHECK_STRING (name, 0); |
| 1001 | |
| 1002 | program = args[2]; |
| 1003 | |
| 1004 | CHECK_STRING (program, 2); |
| 1005 | |
| 1006 | #ifdef VMS |
| 1007 | /* Make a one member argv with all args concatenated |
| 1008 | together separated by a blank. */ |
| 1009 | len = XSTRING (program)->size + 2; |
| 1010 | for (i = 3; i < nargs; i++) |
| 1011 | { |
| 1012 | tem = args[i]; |
| 1013 | CHECK_STRING (tem, i); |
| 1014 | len += XSTRING (tem)->size + 1; /* count the blank */ |
| 1015 | } |
| 1016 | new_argv = (unsigned char *) alloca (len); |
| 1017 | strcpy (new_argv, XSTRING (program)->data); |
| 1018 | for (i = 3; i < nargs; i++) |
| 1019 | { |
| 1020 | tem = args[i]; |
| 1021 | CHECK_STRING (tem, i); |
| 1022 | strcat (new_argv, " "); |
| 1023 | strcat (new_argv, XSTRING (tem)->data); |
| 1024 | } |
| 1025 | /* Need to add code here to check for program existence on VMS */ |
| 1026 | |
| 1027 | #else /* not VMS */ |
| 1028 | new_argv = (unsigned char **) alloca ((nargs - 1) * sizeof (char *)); |
| 1029 | |
| 1030 | for (i = 3; i < nargs; i++) |
| 1031 | { |
| 1032 | tem = args[i]; |
| 1033 | CHECK_STRING (tem, i); |
| 1034 | new_argv[i - 2] = XSTRING (tem)->data; |
| 1035 | } |
| 1036 | new_argv[i - 2] = 0; |
| 1037 | new_argv[0] = XSTRING (program)->data; |
| 1038 | |
| 1039 | /* If program file name is not absolute, search our path for it */ |
| 1040 | if (new_argv[0][0] != '/') |
| 1041 | { |
| 1042 | tem = Qnil; |
| 1043 | openp (Vexec_path, program, EXEC_SUFFIXES, &tem, 1); |
| 1044 | if (NILP (tem)) |
| 1045 | report_file_error ("Searching for program", Fcons (program, Qnil)); |
| 1046 | new_argv[0] = XSTRING (tem)->data; |
| 1047 | } |
| 1048 | #endif /* not VMS */ |
| 1049 | |
| 1050 | proc = make_process (name); |
| 1051 | /* If an error occurs and we can't start the process, we want to |
| 1052 | remove it from the process list. This means that each error |
| 1053 | check in create_process doesn't need to call remove_process |
| 1054 | itself; it's all taken care of here. */ |
| 1055 | record_unwind_protect (start_process_unwind, proc); |
| 1056 | |
| 1057 | XPROCESS (proc)->childp = Qt; |
| 1058 | XPROCESS (proc)->command_channel_p = Qnil; |
| 1059 | XPROCESS (proc)->buffer = buffer; |
| 1060 | XPROCESS (proc)->sentinel = Qnil; |
| 1061 | XPROCESS (proc)->filter = Qnil; |
| 1062 | XPROCESS (proc)->command = Flist (nargs - 2, args + 2); |
| 1063 | |
| 1064 | create_process (proc, new_argv, current_dir); |
| 1065 | |
| 1066 | return unbind_to (count, proc); |
| 1067 | } |
| 1068 | |
| 1069 | /* This function is the unwind_protect form for Fstart_process. If |
| 1070 | PROC doesn't have its pid set, then we know someone has signalled |
| 1071 | an error and the process wasn't started successfully, so we should |
| 1072 | remove it from the process list. */ |
| 1073 | static Lisp_Object |
| 1074 | start_process_unwind (proc) |
| 1075 | Lisp_Object proc; |
| 1076 | { |
| 1077 | if (XTYPE (proc) != Lisp_Process) |
| 1078 | abort (); |
| 1079 | |
| 1080 | /* Was PROC started successfully? */ |
| 1081 | if (XINT (XPROCESS (proc)->pid) <= 0) |
| 1082 | remove_process (proc); |
| 1083 | |
| 1084 | return Qnil; |
| 1085 | } |
| 1086 | |
| 1087 | |
| 1088 | SIGTYPE |
| 1089 | create_process_1 (signo) |
| 1090 | int signo; |
| 1091 | { |
| 1092 | #ifdef USG |
| 1093 | /* USG systems forget handlers when they are used; |
| 1094 | must reestablish each time */ |
| 1095 | signal (signo, create_process_1); |
| 1096 | #endif /* USG */ |
| 1097 | } |
| 1098 | |
| 1099 | #if 0 /* This doesn't work; see the note before sigchld_handler. */ |
| 1100 | #ifdef USG |
| 1101 | #ifdef SIGCHLD |
| 1102 | /* Mimic blocking of signals on system V, which doesn't really have it. */ |
| 1103 | |
| 1104 | /* Nonzero means we got a SIGCHLD when it was supposed to be blocked. */ |
| 1105 | int sigchld_deferred; |
| 1106 | |
| 1107 | SIGTYPE |
| 1108 | create_process_sigchld () |
| 1109 | { |
| 1110 | signal (SIGCHLD, create_process_sigchld); |
| 1111 | |
| 1112 | sigchld_deferred = 1; |
| 1113 | } |
| 1114 | #endif |
| 1115 | #endif |
| 1116 | #endif |
| 1117 | |
| 1118 | #ifndef VMS /* VMS version of this function is in vmsproc.c. */ |
| 1119 | create_process (process, new_argv, current_dir) |
| 1120 | Lisp_Object process; |
| 1121 | char **new_argv; |
| 1122 | Lisp_Object current_dir; |
| 1123 | { |
| 1124 | int pid, inchannel, outchannel, forkin, forkout; |
| 1125 | int sv[2]; |
| 1126 | #ifdef SIGCHLD |
| 1127 | SIGTYPE (*sigchld)(); |
| 1128 | #endif |
| 1129 | int pty_flag = 0; |
| 1130 | extern char **environ; |
| 1131 | |
| 1132 | inchannel = outchannel = -1; |
| 1133 | |
| 1134 | #ifdef HAVE_PTYS |
| 1135 | if (EQ (Vprocess_connection_type, Qt)) |
| 1136 | outchannel = inchannel = allocate_pty (); |
| 1137 | |
| 1138 | if (inchannel >= 0) |
| 1139 | { |
| 1140 | #ifndef USG |
| 1141 | /* On USG systems it does not work to open the pty's tty here |
| 1142 | and then close and reopen it in the child. */ |
| 1143 | #ifdef O_NOCTTY |
| 1144 | /* Don't let this terminal become our controlling terminal |
| 1145 | (in case we don't have one). */ |
| 1146 | forkout = forkin = open (pty_name, O_RDWR | O_NOCTTY, 0); |
| 1147 | #else |
| 1148 | forkout = forkin = open (pty_name, O_RDWR, 0); |
| 1149 | #endif |
| 1150 | if (forkin < 0) |
| 1151 | report_file_error ("Opening pty", Qnil); |
| 1152 | #else |
| 1153 | forkin = forkout = -1; |
| 1154 | #endif /* not USG */ |
| 1155 | pty_flag = 1; |
| 1156 | } |
| 1157 | else |
| 1158 | #endif /* HAVE_PTYS */ |
| 1159 | #ifdef SKTPAIR |
| 1160 | { |
| 1161 | if (socketpair (AF_UNIX, SOCK_STREAM, 0, sv) < 0) |
| 1162 | report_file_error ("Opening socketpair", Qnil); |
| 1163 | outchannel = inchannel = sv[0]; |
| 1164 | forkout = forkin = sv[1]; |
| 1165 | } |
| 1166 | #else /* not SKTPAIR */ |
| 1167 | { |
| 1168 | pipe (sv); |
| 1169 | inchannel = sv[0]; |
| 1170 | forkout = sv[1]; |
| 1171 | pipe (sv); |
| 1172 | outchannel = sv[1]; |
| 1173 | forkin = sv[0]; |
| 1174 | } |
| 1175 | #endif /* not SKTPAIR */ |
| 1176 | |
| 1177 | #if 0 |
| 1178 | /* Replaced by close_process_descs */ |
| 1179 | set_exclusive_use (inchannel); |
| 1180 | set_exclusive_use (outchannel); |
| 1181 | #endif |
| 1182 | |
| 1183 | /* Stride people say it's a mystery why this is needed |
| 1184 | as well as the O_NDELAY, but that it fails without this. */ |
| 1185 | #if defined (STRIDE) || (defined (pfa) && defined (HAVE_PTYS)) |
| 1186 | { |
| 1187 | int one = 1; |
| 1188 | ioctl (inchannel, FIONBIO, &one); |
| 1189 | } |
| 1190 | #endif |
| 1191 | |
| 1192 | #ifdef O_NONBLOCK |
| 1193 | fcntl (inchannel, F_SETFL, O_NONBLOCK); |
| 1194 | #else |
| 1195 | #ifdef O_NDELAY |
| 1196 | fcntl (inchannel, F_SETFL, O_NDELAY); |
| 1197 | #endif |
| 1198 | #endif |
| 1199 | |
| 1200 | /* Record this as an active process, with its channels. |
| 1201 | As a result, child_setup will close Emacs's side of the pipes. */ |
| 1202 | chan_process[inchannel] = process; |
| 1203 | XFASTINT (XPROCESS (process)->infd) = inchannel; |
| 1204 | XFASTINT (XPROCESS (process)->outfd) = outchannel; |
| 1205 | /* Record the tty descriptor used in the subprocess. */ |
| 1206 | if (forkin < 0) |
| 1207 | XPROCESS (process)->subtty = Qnil; |
| 1208 | else |
| 1209 | XFASTINT (XPROCESS (process)->subtty) = forkin; |
| 1210 | XPROCESS (process)->pty_flag = (pty_flag ? Qt : Qnil); |
| 1211 | XPROCESS (process)->status = Qrun; |
| 1212 | |
| 1213 | /* Delay interrupts until we have a chance to store |
| 1214 | the new fork's pid in its process structure */ |
| 1215 | #ifdef SIGCHLD |
| 1216 | #ifdef BSD4_1 |
| 1217 | sighold (SIGCHLD); |
| 1218 | #else /* not BSD4_1 */ |
| 1219 | #if defined (BSD) || defined (UNIPLUS) || defined (HPUX) |
| 1220 | sigsetmask (sigmask (SIGCHLD)); |
| 1221 | #else /* ordinary USG */ |
| 1222 | #if 0 |
| 1223 | sigchld_deferred = 0; |
| 1224 | sigchld = signal (SIGCHLD, create_process_sigchld); |
| 1225 | #endif |
| 1226 | #endif /* ordinary USG */ |
| 1227 | #endif /* not BSD4_1 */ |
| 1228 | #endif /* SIGCHLD */ |
| 1229 | |
| 1230 | /* Until we store the proper pid, enable sigchld_handler |
| 1231 | to recognize an unknown pid as standing for this process. |
| 1232 | It is very important not to let this `marker' value stay |
| 1233 | in the table after this function has returned; if it does |
| 1234 | it might cause call-process to hang and subsequent asynchronous |
| 1235 | processes to get their return values scrambled. */ |
| 1236 | XSETINT (XPROCESS (process)->pid, -1); |
| 1237 | |
| 1238 | { |
| 1239 | /* child_setup must clobber environ on systems with true vfork. |
| 1240 | Protect it from permanent change. */ |
| 1241 | char **save_environ = environ; |
| 1242 | |
| 1243 | pid = vfork (); |
| 1244 | if (pid == 0) |
| 1245 | { |
| 1246 | int xforkin = forkin; |
| 1247 | int xforkout = forkout; |
| 1248 | |
| 1249 | #if 0 /* This was probably a mistake--it duplicates code later on, |
| 1250 | but fails to handle all the cases. */ |
| 1251 | /* Make sure SIGCHLD is not blocked in the child. */ |
| 1252 | sigsetmask (SIGEMPTYMASK); |
| 1253 | #endif |
| 1254 | |
| 1255 | /* Make the pty be the controlling terminal of the process. */ |
| 1256 | #ifdef HAVE_PTYS |
| 1257 | /* First, disconnect its current controlling terminal. */ |
| 1258 | #ifdef HAVE_SETSID |
| 1259 | setsid (); |
| 1260 | #ifdef TIOCSCTTY |
| 1261 | /* Make the pty's terminal the controlling terminal. */ |
| 1262 | if (pty_flag) |
| 1263 | /* We ignore the return value |
| 1264 | because faith@cs.unc.edu says that is necessary on Linux. */ |
| 1265 | ioctl (xforkin, TIOCSCTTY, 0); |
| 1266 | #endif |
| 1267 | #else /* not HAVE_SETSID */ |
| 1268 | #if defined (USG) && !defined (IRIX) |
| 1269 | /* It's very important to call setpgrp() here and no time |
| 1270 | afterwards. Otherwise, we lose our controlling tty which |
| 1271 | is set when we open the pty. */ |
| 1272 | setpgrp (); |
| 1273 | #endif /* USG */ |
| 1274 | #endif /* not HAVE_SETSID */ |
| 1275 | #ifdef TIOCNOTTY |
| 1276 | /* In 4.3BSD, the TIOCSPGRP bug has been fixed, and now you |
| 1277 | can do TIOCSPGRP only to the process's controlling tty. */ |
| 1278 | if (pty_flag) |
| 1279 | { |
| 1280 | /* I wonder: would just ioctl (0, TIOCNOTTY, 0) work here? |
| 1281 | I can't test it since I don't have 4.3. */ |
| 1282 | int j = open ("/dev/tty", O_RDWR, 0); |
| 1283 | ioctl (j, TIOCNOTTY, 0); |
| 1284 | close (j); |
| 1285 | #if !defined (USG) || defined (IRIX) |
| 1286 | /* In order to get a controlling terminal on some versions |
| 1287 | of BSD, it is necessary to put the process in pgrp 0 |
| 1288 | before it opens the terminal. */ |
| 1289 | setpgrp (0, 0); |
| 1290 | #endif |
| 1291 | } |
| 1292 | #endif /* TIOCNOTTY */ |
| 1293 | |
| 1294 | #if !defined (RTU) && !defined (UNIPLUS) |
| 1295 | /*** There is a suggestion that this ought to be a |
| 1296 | conditional on TIOCSPGRP. */ |
| 1297 | /* Now close the pty (if we had it open) and reopen it. |
| 1298 | This makes the pty the controlling terminal of the subprocess. */ |
| 1299 | if (pty_flag) |
| 1300 | { |
| 1301 | /* I wonder if close (open (pty_name, ...)) would work? */ |
| 1302 | if (xforkin >= 0) |
| 1303 | close (xforkin); |
| 1304 | xforkout = xforkin = open (pty_name, O_RDWR, 0); |
| 1305 | |
| 1306 | if (xforkin < 0) |
| 1307 | abort (); |
| 1308 | } |
| 1309 | #endif /* not UNIPLUS and not RTU */ |
| 1310 | #ifdef SETUP_SLAVE_PTY |
| 1311 | SETUP_SLAVE_PTY; |
| 1312 | #endif /* SETUP_SLAVE_PTY */ |
| 1313 | #ifdef AIX |
| 1314 | /* On AIX, we've disabled SIGHUP above once we start a child on a pty. |
| 1315 | Now reenable it in the child, so it will die when we want it to. */ |
| 1316 | if (pty_flag) |
| 1317 | signal (SIGHUP, SIG_DFL); |
| 1318 | #endif |
| 1319 | #endif /* HAVE_PTYS */ |
| 1320 | |
| 1321 | #ifdef SIGCHLD |
| 1322 | #ifdef BSD4_1 |
| 1323 | sigrelse (SIGCHLD); |
| 1324 | #else /* not BSD4_1 */ |
| 1325 | #if defined (BSD) || defined (UNIPLUS) || defined (HPUX) |
| 1326 | sigsetmask (SIGEMPTYMASK); |
| 1327 | #else /* ordinary USG */ |
| 1328 | #if 0 |
| 1329 | signal (SIGCHLD, sigchld); |
| 1330 | #endif |
| 1331 | #endif /* ordinary USG */ |
| 1332 | #endif /* not BSD4_1 */ |
| 1333 | #endif /* SIGCHLD */ |
| 1334 | |
| 1335 | child_setup_tty (xforkout); |
| 1336 | child_setup (xforkin, xforkout, xforkout, |
| 1337 | new_argv, 1, current_dir); |
| 1338 | } |
| 1339 | environ = save_environ; |
| 1340 | } |
| 1341 | |
| 1342 | if (pid < 0) |
| 1343 | report_file_error ("Doing vfork", Qnil); |
| 1344 | |
| 1345 | XFASTINT (XPROCESS (process)->pid) = pid; |
| 1346 | |
| 1347 | FD_SET (inchannel, &input_wait_mask); |
| 1348 | |
| 1349 | /* If the subfork execv fails, and it exits, |
| 1350 | this close hangs. I don't know why. |
| 1351 | So have an interrupt jar it loose. */ |
| 1352 | stop_polling (); |
| 1353 | signal (SIGALRM, create_process_1); |
| 1354 | alarm (1); |
| 1355 | #ifdef SYSV4_PTYS |
| 1356 | /* OK to close only if it's not a pty. Otherwise we need to leave |
| 1357 | it open for ioctl to get pgrp when signals are sent, or to send |
| 1358 | the interrupt characters through if that's how we're signalling |
| 1359 | subprocesses. Alternately if you are concerned about running out |
| 1360 | of file descriptors, you could just save the tty name and open |
| 1361 | just to do the ioctl. */ |
| 1362 | if (NILP (XFASTINT (XPROCESS (process)->pty_flag))) |
| 1363 | #endif |
| 1364 | { |
| 1365 | XPROCESS (process)->subtty = Qnil; |
| 1366 | if (forkin >= 0) |
| 1367 | close (forkin); |
| 1368 | } |
| 1369 | alarm (0); |
| 1370 | start_polling (); |
| 1371 | if (forkin != forkout && forkout >= 0) |
| 1372 | close (forkout); |
| 1373 | |
| 1374 | #ifdef SIGCHLD |
| 1375 | #ifdef BSD4_1 |
| 1376 | sigrelse (SIGCHLD); |
| 1377 | #else /* not BSD4_1 */ |
| 1378 | #if defined (BSD) || defined (UNIPLUS) || defined (HPUX) |
| 1379 | sigsetmask (SIGEMPTYMASK); |
| 1380 | #else /* ordinary USG */ |
| 1381 | #if 0 |
| 1382 | signal (SIGCHLD, sigchld); |
| 1383 | /* Now really handle any of these signals |
| 1384 | that came in during this function. */ |
| 1385 | if (sigchld_deferred) |
| 1386 | kill (getpid (), SIGCHLD); |
| 1387 | #endif |
| 1388 | #endif /* ordinary USG */ |
| 1389 | #endif /* not BSD4_1 */ |
| 1390 | #endif /* SIGCHLD */ |
| 1391 | } |
| 1392 | #endif /* not VMS */ |
| 1393 | |
| 1394 | #ifdef HAVE_SOCKETS |
| 1395 | |
| 1396 | /* open a TCP network connection to a given HOST/SERVICE. Treated |
| 1397 | exactly like a normal process when reading and writing. Only |
| 1398 | differences are in status display and process deletion. A network |
| 1399 | connection has no PID; you cannot signal it. All you can do is |
| 1400 | deactivate and close it via delete-process */ |
| 1401 | |
| 1402 | DEFUN ("open-network-stream", Fopen_network_stream, Sopen_network_stream, |
| 1403 | 4, 4, 0, |
| 1404 | "Open a TCP connection for a service to a host.\n\ |
| 1405 | Returns a subprocess-object to represent the connection.\n\ |
| 1406 | Input and output work as for subprocesses; `delete-process' closes it.\n\ |
| 1407 | Args are NAME BUFFER HOST SERVICE.\n\ |
| 1408 | NAME is name for process. It is modified if necessary to make it unique.\n\ |
| 1409 | BUFFER is the buffer (or buffer-name) to associate with the process.\n\ |
| 1410 | Process output goes at end of that buffer, unless you specify\n\ |
| 1411 | an output stream or filter function to handle the output.\n\ |
| 1412 | BUFFER may be also nil, meaning that this process is not associated\n\ |
| 1413 | with any buffer\n\ |
| 1414 | Third arg is name of the host to connect to, or its IP address.\n\ |
| 1415 | Fourth arg SERVICE is name of the service desired, or an integer\n\ |
| 1416 | specifying a port number to connect to.") |
| 1417 | (name, buffer, host, service) |
| 1418 | Lisp_Object name, buffer, host, service; |
| 1419 | { |
| 1420 | Lisp_Object proc; |
| 1421 | register int i; |
| 1422 | struct sockaddr_in address; |
| 1423 | struct servent *svc_info; |
| 1424 | struct hostent *host_info_ptr, host_info; |
| 1425 | char *(addr_list[2]); |
| 1426 | unsigned long numeric_addr; |
| 1427 | int s, outch, inch; |
| 1428 | char errstring[80]; |
| 1429 | int port; |
| 1430 | struct hostent host_info_fixed; |
| 1431 | struct gcpro gcpro1, gcpro2, gcpro3, gcpro4; |
| 1432 | |
| 1433 | GCPRO4 (name, buffer, host, service); |
| 1434 | CHECK_STRING (name, 0); |
| 1435 | CHECK_STRING (host, 0); |
| 1436 | if (XTYPE(service) == Lisp_Int) |
| 1437 | port = htons ((unsigned short) XINT (service)); |
| 1438 | else |
| 1439 | { |
| 1440 | CHECK_STRING (service, 0); |
| 1441 | svc_info = getservbyname (XSTRING (service)->data, "tcp"); |
| 1442 | if (svc_info == 0) |
| 1443 | error ("Unknown service \"%s\"", XSTRING (service)->data); |
| 1444 | port = svc_info->s_port; |
| 1445 | } |
| 1446 | |
| 1447 | host_info_ptr = gethostbyname (XSTRING (host)->data); |
| 1448 | if (host_info_ptr == 0) |
| 1449 | /* Attempt to interpret host as numeric inet address */ |
| 1450 | { |
| 1451 | numeric_addr = inet_addr (XSTRING (host)->data); |
| 1452 | if (numeric_addr == -1) |
| 1453 | error ("Unknown host \"%s\"", XSTRING (host)->data); |
| 1454 | |
| 1455 | host_info_ptr = &host_info; |
| 1456 | host_info.h_name = 0; |
| 1457 | host_info.h_aliases = 0; |
| 1458 | host_info.h_addrtype = AF_INET; |
| 1459 | #ifdef h_addr |
| 1460 | /* Older machines have only one address slot called h_addr. |
| 1461 | Newer machines have h_addr_list, but #define h_addr to |
| 1462 | be its first element. */ |
| 1463 | host_info.h_addr_list = &(addr_list[0]); |
| 1464 | #endif |
| 1465 | host_info.h_addr = (char*)(&numeric_addr); |
| 1466 | addr_list[1] = 0; |
| 1467 | host_info.h_length = strlen (addr_list[0]); |
| 1468 | } |
| 1469 | |
| 1470 | bzero (&address, sizeof address); |
| 1471 | bcopy (host_info_ptr->h_addr, (char *) &address.sin_addr, |
| 1472 | host_info_ptr->h_length); |
| 1473 | address.sin_family = host_info_ptr->h_addrtype; |
| 1474 | address.sin_port = port; |
| 1475 | |
| 1476 | s = socket (host_info_ptr->h_addrtype, SOCK_STREAM, 0); |
| 1477 | if (s < 0) |
| 1478 | report_file_error ("error creating socket", Fcons (name, Qnil)); |
| 1479 | |
| 1480 | loop: |
| 1481 | if (connect (s, (struct sockaddr *) &address, sizeof address) == -1) |
| 1482 | { |
| 1483 | int xerrno = errno; |
| 1484 | if (errno == EINTR) |
| 1485 | goto loop; |
| 1486 | close (s); |
| 1487 | errno = xerrno; |
| 1488 | report_file_error ("connection failed", |
| 1489 | Fcons (host, Fcons (name, Qnil))); |
| 1490 | } |
| 1491 | |
| 1492 | inch = s; |
| 1493 | outch = dup (s); |
| 1494 | if (outch < 0) |
| 1495 | report_file_error ("error duplicating socket", Fcons (name, Qnil)); |
| 1496 | |
| 1497 | if (!NILP (buffer)) |
| 1498 | buffer = Fget_buffer_create (buffer); |
| 1499 | proc = make_process (name); |
| 1500 | |
| 1501 | chan_process[inch] = proc; |
| 1502 | |
| 1503 | #ifdef O_NONBLOCK |
| 1504 | fcntl (inch, F_SETFL, O_NONBLOCK); |
| 1505 | #else |
| 1506 | #ifdef O_NDELAY |
| 1507 | fcntl (inch, F_SETFL, O_NDELAY); |
| 1508 | #endif |
| 1509 | #endif |
| 1510 | |
| 1511 | XPROCESS (proc)->childp = host; |
| 1512 | XPROCESS (proc)->command_channel_p = Qnil; |
| 1513 | XPROCESS (proc)->buffer = buffer; |
| 1514 | XPROCESS (proc)->sentinel = Qnil; |
| 1515 | XPROCESS (proc)->filter = Qnil; |
| 1516 | XPROCESS (proc)->command = Qnil; |
| 1517 | XPROCESS (proc)->pid = Qnil; |
| 1518 | XFASTINT (XPROCESS (proc)->infd) = s; |
| 1519 | XFASTINT (XPROCESS (proc)->outfd) = outch; |
| 1520 | XPROCESS (proc)->status = Qrun; |
| 1521 | FD_SET (inch, &input_wait_mask); |
| 1522 | |
| 1523 | UNGCPRO; |
| 1524 | return proc; |
| 1525 | } |
| 1526 | #endif /* HAVE_SOCKETS */ |
| 1527 | |
| 1528 | deactivate_process (proc) |
| 1529 | Lisp_Object proc; |
| 1530 | { |
| 1531 | register int inchannel, outchannel; |
| 1532 | register struct Lisp_Process *p = XPROCESS (proc); |
| 1533 | |
| 1534 | inchannel = XFASTINT (p->infd); |
| 1535 | outchannel = XFASTINT (p->outfd); |
| 1536 | |
| 1537 | if (inchannel) |
| 1538 | { |
| 1539 | /* Beware SIGCHLD hereabouts. */ |
| 1540 | flush_pending_output (inchannel); |
| 1541 | #ifdef VMS |
| 1542 | { |
| 1543 | VMS_PROC_STUFF *get_vms_process_pointer (), *vs; |
| 1544 | sys$dassgn (outchannel); |
| 1545 | vs = get_vms_process_pointer (p->pid); |
| 1546 | if (vs) |
| 1547 | give_back_vms_process_stuff (vs); |
| 1548 | } |
| 1549 | #else |
| 1550 | close (inchannel); |
| 1551 | if (outchannel && outchannel != inchannel) |
| 1552 | close (outchannel); |
| 1553 | #endif |
| 1554 | |
| 1555 | XFASTINT (p->infd) = 0; |
| 1556 | XFASTINT (p->outfd) = 0; |
| 1557 | chan_process[inchannel] = Qnil; |
| 1558 | FD_CLR (inchannel, &input_wait_mask); |
| 1559 | } |
| 1560 | } |
| 1561 | |
| 1562 | /* Close all descriptors currently in use for communication |
| 1563 | with subprocess. This is used in a newly-forked subprocess |
| 1564 | to get rid of irrelevant descriptors. */ |
| 1565 | |
| 1566 | close_process_descs () |
| 1567 | { |
| 1568 | int i; |
| 1569 | for (i = 0; i < MAXDESC; i++) |
| 1570 | { |
| 1571 | Lisp_Object process; |
| 1572 | process = chan_process[i]; |
| 1573 | if (!NILP (process)) |
| 1574 | { |
| 1575 | int in = XFASTINT (XPROCESS (process)->infd); |
| 1576 | int out = XFASTINT (XPROCESS (process)->outfd); |
| 1577 | if (in) |
| 1578 | close (in); |
| 1579 | if (out && in != out) |
| 1580 | close (out); |
| 1581 | } |
| 1582 | } |
| 1583 | } |
| 1584 | \f |
| 1585 | DEFUN ("accept-process-output", Faccept_process_output, Saccept_process_output, |
| 1586 | 0, 3, 0, |
| 1587 | "Allow any pending output from subprocesses to be read by Emacs.\n\ |
| 1588 | It is read into the process' buffers or given to their filter functions.\n\ |
| 1589 | Non-nil arg PROCESS means do not return until some output has been received\n\ |
| 1590 | from PROCESS.\n\ |
| 1591 | Non-nil second arg TIMEOUT and third arg TIMEOUT-MSECS are number of\n\ |
| 1592 | seconds and microseconds to wait; return after that much time whether\n\ |
| 1593 | or not there is input.\n\ |
| 1594 | Return non-nil iff we received any output before the timeout expired.") |
| 1595 | (proc, timeout, timeout_msecs) |
| 1596 | register Lisp_Object proc, timeout, timeout_msecs; |
| 1597 | { |
| 1598 | int seconds; |
| 1599 | int useconds; |
| 1600 | |
| 1601 | if (! NILP (timeout_msecs)) |
| 1602 | { |
| 1603 | CHECK_NUMBER (timeout_msecs, 2); |
| 1604 | useconds = XINT (timeout_msecs); |
| 1605 | if (XTYPE (timeout) != Lisp_Int) |
| 1606 | XSET (timeout, Lisp_Int, 0); |
| 1607 | |
| 1608 | { |
| 1609 | int carry = useconds / 1000000; |
| 1610 | |
| 1611 | XSETINT (timeout, XINT (timeout) + carry); |
| 1612 | useconds -= carry * 1000000; |
| 1613 | |
| 1614 | /* I think this clause is necessary because C doesn't |
| 1615 | guarantee a particular rounding direction for negative |
| 1616 | integers. */ |
| 1617 | if (useconds < 0) |
| 1618 | { |
| 1619 | XSETINT (timeout, XINT (timeout) - 1); |
| 1620 | useconds += 1000000; |
| 1621 | } |
| 1622 | } |
| 1623 | } |
| 1624 | else |
| 1625 | useconds = 0; |
| 1626 | |
| 1627 | if (! NILP (timeout)) |
| 1628 | { |
| 1629 | CHECK_NUMBER (timeout, 1); |
| 1630 | seconds = XINT (timeout); |
| 1631 | if (seconds <= 0) |
| 1632 | seconds = -1; |
| 1633 | } |
| 1634 | else |
| 1635 | { |
| 1636 | if (NILP (proc)) |
| 1637 | seconds = -1; |
| 1638 | else |
| 1639 | seconds = 0; |
| 1640 | } |
| 1641 | |
| 1642 | if (NILP (proc)) |
| 1643 | XFASTINT (proc) = 0; |
| 1644 | |
| 1645 | return |
| 1646 | (wait_reading_process_input (seconds, useconds, proc, 0) |
| 1647 | ? Qt : Qnil); |
| 1648 | } |
| 1649 | |
| 1650 | /* This variable is different from waiting_for_input in keyboard.c. |
| 1651 | It is used to communicate to a lisp process-filter/sentinel (via the |
| 1652 | function Fwaiting_for_user_input_p below) whether emacs was waiting |
| 1653 | for user-input when that process-filter was called. |
| 1654 | waiting_for_input cannot be used as that is by definition 0 when |
| 1655 | lisp code is being evalled */ |
| 1656 | static int waiting_for_user_input_p; |
| 1657 | |
| 1658 | /* Read and dispose of subprocess output while waiting for timeout to |
| 1659 | elapse and/or keyboard input to be available. |
| 1660 | |
| 1661 | time_limit is: |
| 1662 | timeout in seconds, or |
| 1663 | zero for no limit, or |
| 1664 | -1 means gobble data immediately available but don't wait for any. |
| 1665 | |
| 1666 | microsecs is: |
| 1667 | an additional duration to wait (if time_limit is greater than |
| 1668 | zero), specified in millisec. |
| 1669 | |
| 1670 | read_kbd is a lisp value: |
| 1671 | 0 to ignore keyboard input, or |
| 1672 | 1 to return when input is available, or |
| 1673 | -1 meaning caller will actually read the input, so don't throw to |
| 1674 | the quit handler, or |
| 1675 | a cons cell, meaning wait wait until its car is non-nil, or |
| 1676 | a process object, meaning wait until something arrives from that |
| 1677 | process. The return value is true iff we read some input from |
| 1678 | that process. |
| 1679 | |
| 1680 | do_display != 0 means redisplay should be done to show subprocess |
| 1681 | output that arrives. |
| 1682 | |
| 1683 | If read_kbd is a pointer to a struct Lisp_Process, then the |
| 1684 | function returns true iff we received input from that process |
| 1685 | before the timeout elapsed. |
| 1686 | Otherwise, return true iff we received input from any process. */ |
| 1687 | |
| 1688 | wait_reading_process_input (time_limit, microsecs, read_kbd, do_display) |
| 1689 | int time_limit, microsecs; |
| 1690 | Lisp_Object read_kbd; |
| 1691 | int do_display; |
| 1692 | { |
| 1693 | register int channel, nfds, m; |
| 1694 | static SELECT_TYPE Available; |
| 1695 | int xerrno; |
| 1696 | Lisp_Object proc; |
| 1697 | EMACS_TIME timeout, end_time, garbage; |
| 1698 | SELECT_TYPE Atemp; |
| 1699 | int wait_channel = 0; |
| 1700 | struct Lisp_Process *wait_proc = 0; |
| 1701 | int got_some_input = 0; |
| 1702 | Lisp_Object *wait_for_cell = 0; |
| 1703 | |
| 1704 | FD_ZERO (&Available); |
| 1705 | |
| 1706 | /* If read_kbd is a process to watch, set wait_proc and wait_channel |
| 1707 | accordingly. */ |
| 1708 | if (XTYPE (read_kbd) == Lisp_Process) |
| 1709 | { |
| 1710 | wait_proc = XPROCESS (read_kbd); |
| 1711 | wait_channel = XFASTINT (wait_proc->infd); |
| 1712 | XFASTINT (read_kbd) = 0; |
| 1713 | } |
| 1714 | |
| 1715 | /* If waiting for non-nil in a cell, record where. */ |
| 1716 | if (XTYPE (read_kbd) == Lisp_Cons) |
| 1717 | { |
| 1718 | wait_for_cell = &XCONS (read_kbd)->car; |
| 1719 | XFASTINT (read_kbd) = 0; |
| 1720 | } |
| 1721 | |
| 1722 | waiting_for_user_input_p = XINT (read_kbd); |
| 1723 | |
| 1724 | /* Since we may need to wait several times, |
| 1725 | compute the absolute time to return at. */ |
| 1726 | if (time_limit || microsecs) |
| 1727 | { |
| 1728 | EMACS_GET_TIME (end_time); |
| 1729 | EMACS_SET_SECS_USECS (timeout, time_limit, microsecs); |
| 1730 | EMACS_ADD_TIME (end_time, end_time, timeout); |
| 1731 | } |
| 1732 | |
| 1733 | while (1) |
| 1734 | { |
| 1735 | /* If calling from keyboard input, do not quit |
| 1736 | since we want to return C-g as an input character. |
| 1737 | Otherwise, do pending quit if requested. */ |
| 1738 | if (XINT (read_kbd) >= 0) |
| 1739 | QUIT; |
| 1740 | |
| 1741 | /* Compute time from now till when time limit is up */ |
| 1742 | /* Exit if already run out */ |
| 1743 | if (time_limit == -1) |
| 1744 | { |
| 1745 | /* -1 specified for timeout means |
| 1746 | gobble output available now |
| 1747 | but don't wait at all. */ |
| 1748 | |
| 1749 | EMACS_SET_SECS_USECS (timeout, 0, 0); |
| 1750 | } |
| 1751 | else if (time_limit || microsecs) |
| 1752 | { |
| 1753 | EMACS_GET_TIME (timeout); |
| 1754 | EMACS_SUB_TIME (timeout, end_time, timeout); |
| 1755 | if (EMACS_TIME_NEG_P (timeout)) |
| 1756 | break; |
| 1757 | } |
| 1758 | else |
| 1759 | { |
| 1760 | EMACS_SET_SECS_USECS (timeout, 100000, 0); |
| 1761 | } |
| 1762 | |
| 1763 | /* Cause C-g and alarm signals to take immediate action, |
| 1764 | and cause input available signals to zero out timeout. |
| 1765 | |
| 1766 | It is important that we do this before checking for process |
| 1767 | activity. If we get a SIGCHLD after the explicit checks for |
| 1768 | process activity, timeout is the only way we will know. */ |
| 1769 | if (XINT (read_kbd) < 0) |
| 1770 | set_waiting_for_input (&timeout); |
| 1771 | |
| 1772 | /* If status of something has changed, and no input is |
| 1773 | available, notify the user of the change right away. After |
| 1774 | this explicit check, we'll let the SIGCHLD handler zap |
| 1775 | timeout to get our attention. */ |
| 1776 | if (update_tick != process_tick && do_display) |
| 1777 | { |
| 1778 | Atemp = input_wait_mask; |
| 1779 | EMACS_SET_SECS_USECS (timeout, 0, 0); |
| 1780 | if (select (MAXDESC, &Atemp, 0, 0, &timeout) <= 0) |
| 1781 | { |
| 1782 | /* It's okay for us to do this and then continue with |
| 1783 | the loop, since timeout has already been zeroed out. */ |
| 1784 | clear_waiting_for_input (); |
| 1785 | status_notify (); |
| 1786 | } |
| 1787 | } |
| 1788 | |
| 1789 | /* Don't wait for output from a non-running process. */ |
| 1790 | if (wait_proc != 0 && !NILP (wait_proc->raw_status_low)) |
| 1791 | update_status (wait_proc); |
| 1792 | if (wait_proc != 0 |
| 1793 | && ! EQ (wait_proc->status, Qrun)) |
| 1794 | { |
| 1795 | clear_waiting_for_input (); |
| 1796 | break; |
| 1797 | } |
| 1798 | |
| 1799 | /* Wait till there is something to do */ |
| 1800 | |
| 1801 | Available = input_wait_mask; |
| 1802 | if (! XINT (read_kbd)) |
| 1803 | FD_CLR (0, &Available); |
| 1804 | |
| 1805 | /* If frame size has changed or the window is newly mapped, |
| 1806 | redisplay now, before we start to wait. There is a race |
| 1807 | condition here; if a SIGIO arrives between now and the select |
| 1808 | and indicates that a frame is trashed, the select may block |
| 1809 | displaying a trashed screen. */ |
| 1810 | if (frame_garbaged) |
| 1811 | redisplay_preserve_echo_area (); |
| 1812 | |
| 1813 | if (XINT (read_kbd) && detect_input_pending ()) |
| 1814 | nfds = 0; |
| 1815 | else |
| 1816 | nfds = select (MAXDESC, &Available, 0, 0, &timeout); |
| 1817 | |
| 1818 | xerrno = errno; |
| 1819 | |
| 1820 | /* Make C-g and alarm signals set flags again */ |
| 1821 | clear_waiting_for_input (); |
| 1822 | |
| 1823 | /* If we woke up due to SIGWINCH, actually change size now. */ |
| 1824 | do_pending_window_change (); |
| 1825 | |
| 1826 | if (time_limit && nfds == 0) /* timeout elapsed */ |
| 1827 | break; |
| 1828 | if (nfds < 0) |
| 1829 | { |
| 1830 | if (xerrno == EINTR) |
| 1831 | FD_ZERO (&Available); |
| 1832 | #ifdef ultrix |
| 1833 | /* Ultrix select seems to return ENOMEM when it is |
| 1834 | interrupted. Treat it just like EINTR. Bleah. Note |
| 1835 | that we want to test for the "ultrix" CPP symbol, not |
| 1836 | "__ultrix__"; the latter is only defined under GCC, but |
| 1837 | not by DEC's bundled CC. -JimB */ |
| 1838 | else if (xerrno == ENOMEM) |
| 1839 | FD_ZERO (&Available); |
| 1840 | #endif |
| 1841 | #ifdef ALLIANT |
| 1842 | /* This happens for no known reason on ALLIANT. |
| 1843 | I am guessing that this is the right response. -- RMS. */ |
| 1844 | else if (xerrno == EFAULT) |
| 1845 | FD_ZERO (&Available); |
| 1846 | #endif |
| 1847 | else if (xerrno == EBADF) |
| 1848 | { |
| 1849 | #ifdef AIX |
| 1850 | /* AIX doesn't handle PTY closure the same way BSD does. On AIX, |
| 1851 | the child's closure of the pts gives the parent a SIGHUP, and |
| 1852 | the ptc file descriptor is automatically closed, |
| 1853 | yielding EBADF here or at select() call above. |
| 1854 | So, SIGHUP is ignored (see def of PTY_TTY_NAME_SPRINTF |
| 1855 | in m-ibmrt-aix.h), and here we just ignore the select error. |
| 1856 | Cleanup occurs c/o status_notify after SIGCLD. */ |
| 1857 | FD_ZERO (&Available); /* Cannot depend on values returned */ |
| 1858 | #else |
| 1859 | abort (); |
| 1860 | #endif |
| 1861 | } |
| 1862 | else |
| 1863 | error("select error: %s", sys_errlist[xerrno]); |
| 1864 | } |
| 1865 | #if defined(sun) && !defined(USG5_4) |
| 1866 | else if (nfds > 0 && FD_ISSET (0, &Available) && interrupt_input) |
| 1867 | /* System sometimes fails to deliver SIGIO. |
| 1868 | |
| 1869 | David J. Mackenzie says that Emacs doesn't compile under |
| 1870 | Solaris if this code is enabled, thus the USG5_4 in the CPP |
| 1871 | conditional. "I haven't noticed any ill effects so far. |
| 1872 | If you find a Solaris expert somewhere, they might know |
| 1873 | better." */ |
| 1874 | kill (getpid (), SIGIO); |
| 1875 | #endif |
| 1876 | |
| 1877 | /* Check for keyboard input */ |
| 1878 | /* If there is any, return immediately |
| 1879 | to give it higher priority than subprocesses */ |
| 1880 | |
| 1881 | if (XINT (read_kbd) && detect_input_pending ()) |
| 1882 | { |
| 1883 | swallow_events (); |
| 1884 | if (detect_input_pending ()) |
| 1885 | break; |
| 1886 | } |
| 1887 | |
| 1888 | /* Exit now if the cell we're waiting for became non-nil. */ |
| 1889 | if (wait_for_cell && ! NILP (*wait_for_cell)) |
| 1890 | break; |
| 1891 | |
| 1892 | #ifdef SIGIO |
| 1893 | /* If we think we have keyboard input waiting, but didn't get SIGIO |
| 1894 | go read it. This can happen with X on BSD after logging out. |
| 1895 | In that case, there really is no input and no SIGIO, |
| 1896 | but select says there is input. */ |
| 1897 | |
| 1898 | if (XINT (read_kbd) && interrupt_input && (FD_ISSET (fileno (stdin), &Available))) |
| 1899 | kill (0, SIGIO); |
| 1900 | #endif |
| 1901 | |
| 1902 | if (! wait_proc) |
| 1903 | got_some_input |= nfds > 0; |
| 1904 | |
| 1905 | /* If checking input just got us a size-change event from X, |
| 1906 | obey it now if we should. */ |
| 1907 | if (XINT (read_kbd)) |
| 1908 | do_pending_window_change (); |
| 1909 | |
| 1910 | /* Check for data from a process or a command channel */ |
| 1911 | for (channel = FIRST_PROC_DESC; channel < MAXDESC; channel++) |
| 1912 | { |
| 1913 | if (FD_ISSET (channel, &Available)) |
| 1914 | { |
| 1915 | int nread; |
| 1916 | |
| 1917 | /* If waiting for this channel, arrange to return as |
| 1918 | soon as no more input to be processed. No more |
| 1919 | waiting. */ |
| 1920 | if (wait_channel == channel) |
| 1921 | { |
| 1922 | wait_channel = 0; |
| 1923 | time_limit = -1; |
| 1924 | got_some_input = 1; |
| 1925 | } |
| 1926 | proc = chan_process[channel]; |
| 1927 | if (NILP (proc)) |
| 1928 | continue; |
| 1929 | |
| 1930 | /* Read data from the process, starting with our |
| 1931 | buffered-ahead character if we have one. */ |
| 1932 | |
| 1933 | nread = read_process_output (proc, channel); |
| 1934 | if (nread > 0) |
| 1935 | { |
| 1936 | /* Since read_process_output can run a filter, |
| 1937 | which can call accept-process-output, |
| 1938 | don't try to read from any other processes |
| 1939 | before doing the select again. */ |
| 1940 | FD_ZERO (&Available); |
| 1941 | |
| 1942 | if (do_display) |
| 1943 | redisplay_preserve_echo_area (); |
| 1944 | } |
| 1945 | #ifdef EWOULDBLOCK |
| 1946 | else if (nread == -1 && errno == EWOULDBLOCK) |
| 1947 | ; |
| 1948 | #else |
| 1949 | #ifdef O_NONBLOCK |
| 1950 | else if (nread == -1 && errno == EAGAIN) |
| 1951 | ; |
| 1952 | #else |
| 1953 | #ifdef O_NDELAY |
| 1954 | else if (nread == -1 && errno == EAGAIN) |
| 1955 | ; |
| 1956 | /* Note that we cannot distinguish between no input |
| 1957 | available now and a closed pipe. |
| 1958 | With luck, a closed pipe will be accompanied by |
| 1959 | subprocess termination and SIGCHLD. */ |
| 1960 | else if (nread == 0 && !NETCONN_P (proc)) |
| 1961 | ; |
| 1962 | #endif /* O_NDELAY */ |
| 1963 | #endif /* O_NONBLOCK */ |
| 1964 | #endif /* EWOULDBLOCK */ |
| 1965 | #ifdef HAVE_PTYS |
| 1966 | /* On some OSs with ptys, when the process on one end of |
| 1967 | a pty exits, the other end gets an error reading with |
| 1968 | errno = EIO instead of getting an EOF (0 bytes read). |
| 1969 | Therefore, if we get an error reading and errno = |
| 1970 | EIO, just continue, because the child process has |
| 1971 | exited and should clean itself up soon (e.g. when we |
| 1972 | get a SIGCHLD). */ |
| 1973 | else if (nread == -1 && errno == EIO) |
| 1974 | ; |
| 1975 | #endif /* HAVE_PTYS */ |
| 1976 | /* If we can detect process termination, don't consider the process |
| 1977 | gone just because its pipe is closed. */ |
| 1978 | #ifdef SIGCHLD |
| 1979 | else if (nread == 0 && !NETCONN_P (proc)) |
| 1980 | ; |
| 1981 | #endif |
| 1982 | else |
| 1983 | { |
| 1984 | /* Preserve status of processes already terminated. */ |
| 1985 | XSETINT (XPROCESS (proc)->tick, ++process_tick); |
| 1986 | deactivate_process (proc); |
| 1987 | if (!NILP (XPROCESS (proc)->raw_status_low)) |
| 1988 | update_status (XPROCESS (proc)); |
| 1989 | if (EQ (XPROCESS (proc)->status, Qrun)) |
| 1990 | XPROCESS (proc)->status |
| 1991 | = Fcons (Qexit, Fcons (make_number (256), Qnil)); |
| 1992 | } |
| 1993 | } |
| 1994 | } /* end for each file descriptor */ |
| 1995 | } /* end while exit conditions not met */ |
| 1996 | |
| 1997 | /* If calling from keyboard input, do not quit |
| 1998 | since we want to return C-g as an input character. |
| 1999 | Otherwise, do pending quit if requested. */ |
| 2000 | if (XINT (read_kbd) >= 0) |
| 2001 | { |
| 2002 | /* Prevent input_pending from remaining set if we quit. */ |
| 2003 | clear_input_pending (); |
| 2004 | QUIT; |
| 2005 | } |
| 2006 | |
| 2007 | return got_some_input; |
| 2008 | } |
| 2009 | \f |
| 2010 | /* Read pending output from the process channel, |
| 2011 | starting with our buffered-ahead character if we have one. |
| 2012 | Yield number of characters read. |
| 2013 | |
| 2014 | This function reads at most 1024 characters. |
| 2015 | If you want to read all available subprocess output, |
| 2016 | you must call it repeatedly until it returns zero. */ |
| 2017 | |
| 2018 | read_process_output (proc, channel) |
| 2019 | Lisp_Object proc; |
| 2020 | register int channel; |
| 2021 | { |
| 2022 | register int nchars; |
| 2023 | #ifdef VMS |
| 2024 | char *chars; |
| 2025 | #else |
| 2026 | char chars[1024]; |
| 2027 | #endif |
| 2028 | register Lisp_Object outstream; |
| 2029 | register struct buffer *old = current_buffer; |
| 2030 | register struct Lisp_Process *p = XPROCESS (proc); |
| 2031 | register int opoint; |
| 2032 | |
| 2033 | #ifdef VMS |
| 2034 | VMS_PROC_STUFF *vs, *get_vms_process_pointer(); |
| 2035 | |
| 2036 | vs = get_vms_process_pointer (p->pid); |
| 2037 | if (vs) |
| 2038 | { |
| 2039 | if (!vs->iosb[0]) |
| 2040 | return(0); /* Really weird if it does this */ |
| 2041 | if (!(vs->iosb[0] & 1)) |
| 2042 | return -1; /* I/O error */ |
| 2043 | } |
| 2044 | else |
| 2045 | error ("Could not get VMS process pointer"); |
| 2046 | chars = vs->inputBuffer; |
| 2047 | nchars = clean_vms_buffer (chars, vs->iosb[1]); |
| 2048 | if (nchars <= 0) |
| 2049 | { |
| 2050 | start_vms_process_read (vs); /* Crank up the next read on the process */ |
| 2051 | return 1; /* Nothing worth printing, say we got 1 */ |
| 2052 | } |
| 2053 | #else /* not VMS */ |
| 2054 | |
| 2055 | if (proc_buffered_char[channel] < 0) |
| 2056 | nchars = read (channel, chars, sizeof chars); |
| 2057 | else |
| 2058 | { |
| 2059 | chars[0] = proc_buffered_char[channel]; |
| 2060 | proc_buffered_char[channel] = -1; |
| 2061 | nchars = read (channel, chars + 1, sizeof chars - 1); |
| 2062 | if (nchars < 0) |
| 2063 | nchars = 1; |
| 2064 | else |
| 2065 | nchars = nchars + 1; |
| 2066 | } |
| 2067 | #endif /* not VMS */ |
| 2068 | |
| 2069 | if (nchars <= 0) return nchars; |
| 2070 | |
| 2071 | outstream = p->filter; |
| 2072 | if (!NILP (outstream)) |
| 2073 | { |
| 2074 | /* We inhibit quit here instead of just catching it so that |
| 2075 | hitting ^G when a filter happens to be running won't screw |
| 2076 | it up. */ |
| 2077 | int count = specpdl_ptr - specpdl; |
| 2078 | Lisp_Object odeactivate; |
| 2079 | |
| 2080 | odeactivate = Vdeactivate_mark; |
| 2081 | |
| 2082 | specbind (Qinhibit_quit, Qt); |
| 2083 | call2 (outstream, proc, make_string (chars, nchars)); |
| 2084 | |
| 2085 | /* Handling the process output should not deactivate the mark. */ |
| 2086 | Vdeactivate_mark = odeactivate; |
| 2087 | |
| 2088 | #ifdef VMS |
| 2089 | start_vms_process_read (vs); |
| 2090 | #endif |
| 2091 | unbind_to (count); |
| 2092 | return nchars; |
| 2093 | } |
| 2094 | |
| 2095 | /* If no filter, write into buffer if it isn't dead. */ |
| 2096 | if (!NILP (p->buffer) && !NILP (XBUFFER (p->buffer)->name)) |
| 2097 | { |
| 2098 | Lisp_Object old_read_only; |
| 2099 | Lisp_Object old_begv, old_zv; |
| 2100 | Lisp_Object odeactivate; |
| 2101 | |
| 2102 | odeactivate = Vdeactivate_mark; |
| 2103 | |
| 2104 | Fset_buffer (p->buffer); |
| 2105 | opoint = point; |
| 2106 | old_read_only = current_buffer->read_only; |
| 2107 | XFASTINT (old_begv) = BEGV; |
| 2108 | XFASTINT (old_zv) = ZV; |
| 2109 | |
| 2110 | current_buffer->read_only = Qnil; |
| 2111 | |
| 2112 | /* Insert new output into buffer |
| 2113 | at the current end-of-output marker, |
| 2114 | thus preserving logical ordering of input and output. */ |
| 2115 | if (XMARKER (p->mark)->buffer) |
| 2116 | SET_PT (marker_position (p->mark)); |
| 2117 | else |
| 2118 | SET_PT (ZV); |
| 2119 | |
| 2120 | /* If the output marker is outside of the visible region, save |
| 2121 | the restriction and widen. */ |
| 2122 | if (! (BEGV <= point && point <= ZV)) |
| 2123 | Fwiden (); |
| 2124 | |
| 2125 | /* Make sure opoint floats ahead of any new text, just as point |
| 2126 | would. */ |
| 2127 | if (point <= opoint) |
| 2128 | opoint += nchars; |
| 2129 | |
| 2130 | /* Insert after old_begv, but before old_zv. */ |
| 2131 | if (point < XFASTINT (old_begv)) |
| 2132 | XFASTINT (old_begv) += nchars; |
| 2133 | if (point <= XFASTINT (old_zv)) |
| 2134 | XFASTINT (old_zv) += nchars; |
| 2135 | |
| 2136 | /* Insert before markers in case we are inserting where |
| 2137 | the buffer's mark is, and the user's next command is Meta-y. */ |
| 2138 | insert_before_markers (chars, nchars); |
| 2139 | Fset_marker (p->mark, make_number (point), p->buffer); |
| 2140 | |
| 2141 | update_mode_lines++; |
| 2142 | |
| 2143 | /* If the restriction isn't what it should be, set it. */ |
| 2144 | if (XFASTINT (old_begv) != BEGV || XFASTINT (old_zv) != ZV) |
| 2145 | Fnarrow_to_region (old_begv, old_zv); |
| 2146 | |
| 2147 | /* Handling the process output should not deactivate the mark. */ |
| 2148 | Vdeactivate_mark = odeactivate; |
| 2149 | |
| 2150 | current_buffer->read_only = old_read_only; |
| 2151 | SET_PT (opoint); |
| 2152 | set_buffer_internal (old); |
| 2153 | } |
| 2154 | #ifdef VMS |
| 2155 | start_vms_process_read (vs); |
| 2156 | #endif |
| 2157 | return nchars; |
| 2158 | } |
| 2159 | |
| 2160 | DEFUN ("waiting-for-user-input-p", Fwaiting_for_user_input_p, Swaiting_for_user_input_p, |
| 2161 | 0, 0, 0, |
| 2162 | "Returns non-NIL if emacs is waiting for input from the user.\n\ |
| 2163 | This is intended for use by asynchronous process output filters and sentinels.") |
| 2164 | () |
| 2165 | { |
| 2166 | return ((waiting_for_user_input_p) ? Qt : Qnil); |
| 2167 | } |
| 2168 | \f |
| 2169 | /* Sending data to subprocess */ |
| 2170 | |
| 2171 | jmp_buf send_process_frame; |
| 2172 | |
| 2173 | SIGTYPE |
| 2174 | send_process_trap () |
| 2175 | { |
| 2176 | #ifdef BSD4_1 |
| 2177 | sigrelse (SIGPIPE); |
| 2178 | sigrelse (SIGALRM); |
| 2179 | #endif /* BSD4_1 */ |
| 2180 | longjmp (send_process_frame, 1); |
| 2181 | } |
| 2182 | |
| 2183 | send_process (proc, buf, len) |
| 2184 | Lisp_Object proc; |
| 2185 | char *buf; |
| 2186 | int len; |
| 2187 | { |
| 2188 | /* Don't use register vars; longjmp can lose them. */ |
| 2189 | int rv; |
| 2190 | unsigned char *procname = XSTRING (XPROCESS (proc)->name)->data; |
| 2191 | |
| 2192 | |
| 2193 | #ifdef VMS |
| 2194 | struct Lisp_Process *p = XPROCESS (proc); |
| 2195 | VMS_PROC_STUFF *vs, *get_vms_process_pointer(); |
| 2196 | #endif /* VMS */ |
| 2197 | |
| 2198 | if (! NILP (XPROCESS (proc)->raw_status_low)) |
| 2199 | update_status (XPROCESS (proc)); |
| 2200 | if (! EQ (XPROCESS (proc)->status, Qrun)) |
| 2201 | error ("Process %s not running", procname); |
| 2202 | |
| 2203 | #ifdef VMS |
| 2204 | vs = get_vms_process_pointer (p->pid); |
| 2205 | if (vs == 0) |
| 2206 | error ("Could not find this process: %x", p->pid); |
| 2207 | else if (write_to_vms_process (vs, buf, len)) |
| 2208 | ; |
| 2209 | #else |
| 2210 | if (!setjmp (send_process_frame)) |
| 2211 | while (len > 0) |
| 2212 | { |
| 2213 | int this = len; |
| 2214 | SIGTYPE (*old_sigpipe)(); |
| 2215 | |
| 2216 | /* Don't send more than 500 bytes at a time. */ |
| 2217 | if (this > 500) |
| 2218 | this = 500; |
| 2219 | old_sigpipe = (SIGTYPE (*) ()) signal (SIGPIPE, send_process_trap); |
| 2220 | rv = write (XFASTINT (XPROCESS (proc)->outfd), buf, this); |
| 2221 | signal (SIGPIPE, old_sigpipe); |
| 2222 | if (rv < 0) |
| 2223 | { |
| 2224 | if (0 |
| 2225 | #ifdef EWOULDBLOCK |
| 2226 | || errno == EWOULDBLOCK |
| 2227 | #endif |
| 2228 | #ifdef EAGAIN |
| 2229 | || errno == EAGAIN |
| 2230 | #endif |
| 2231 | ) |
| 2232 | { |
| 2233 | /* It would be nice to accept process output here, |
| 2234 | but that is difficult. For example, it could |
| 2235 | garbage what we are sending if that is from a buffer. */ |
| 2236 | immediate_quit = 1; |
| 2237 | QUIT; |
| 2238 | sleep (1); |
| 2239 | immediate_quit = 0; |
| 2240 | continue; |
| 2241 | } |
| 2242 | report_file_error ("writing to process", Fcons (proc, Qnil)); |
| 2243 | } |
| 2244 | buf += rv; |
| 2245 | len -= rv; |
| 2246 | /* Allow input from processes between bursts of sending. |
| 2247 | Otherwise things may get stopped up. */ |
| 2248 | if (len > 0) |
| 2249 | { |
| 2250 | Lisp_Object zero; |
| 2251 | |
| 2252 | XFASTINT (zero) = 0; |
| 2253 | wait_reading_process_input (-1, 0, zero, 0); |
| 2254 | } |
| 2255 | } |
| 2256 | #endif |
| 2257 | else |
| 2258 | { |
| 2259 | XPROCESS (proc)->raw_status_low = Qnil; |
| 2260 | XPROCESS (proc)->raw_status_high = Qnil; |
| 2261 | XPROCESS (proc)->status = Fcons (Qexit, Fcons (make_number (256), Qnil)); |
| 2262 | XSETINT (XPROCESS (proc)->tick, ++process_tick); |
| 2263 | deactivate_process (proc); |
| 2264 | #ifdef VMS |
| 2265 | error ("Error writing to process %s; closed it", procname); |
| 2266 | #else |
| 2267 | error ("SIGPIPE raised on process %s; closed it", procname); |
| 2268 | #endif |
| 2269 | } |
| 2270 | } |
| 2271 | |
| 2272 | DEFUN ("process-send-region", Fprocess_send_region, Sprocess_send_region, |
| 2273 | 3, 3, 0, |
| 2274 | "Send current contents of region as input to PROCESS.\n\ |
| 2275 | PROCESS may be a process, a buffer, the name of a process or buffer, or\n\ |
| 2276 | nil, indicating the current buffer's process.\n\ |
| 2277 | Called from program, takes three arguments, PROCESS, START and END.\n\ |
| 2278 | If the region is more than 500 characters long,\n\ |
| 2279 | it is sent in several bunches. This may happen even for shorter regions.\n\ |
| 2280 | Output from processes can arrive in between bunches.") |
| 2281 | (process, start, end) |
| 2282 | Lisp_Object process, start, end; |
| 2283 | { |
| 2284 | Lisp_Object proc; |
| 2285 | int start1; |
| 2286 | |
| 2287 | proc = get_process (process); |
| 2288 | validate_region (&start, &end); |
| 2289 | |
| 2290 | if (XINT (start) < GPT && XINT (end) > GPT) |
| 2291 | move_gap (start); |
| 2292 | |
| 2293 | start1 = XINT (start); |
| 2294 | send_process (proc, &FETCH_CHAR (start1), XINT (end) - XINT (start)); |
| 2295 | |
| 2296 | return Qnil; |
| 2297 | } |
| 2298 | |
| 2299 | DEFUN ("process-send-string", Fprocess_send_string, Sprocess_send_string, |
| 2300 | 2, 2, 0, |
| 2301 | "Send PROCESS the contents of STRING as input.\n\ |
| 2302 | PROCESS may be a process, a buffer, the name of a process or buffer, or\n\ |
| 2303 | nil, indicating the current buffer's process.\n\ |
| 2304 | If STRING is more than 500 characters long,\n\ |
| 2305 | it is sent in several bunches. This may happen even for shorter strings.\n\ |
| 2306 | Output from processes can arrive in between bunches.") |
| 2307 | (process, string) |
| 2308 | Lisp_Object process, string; |
| 2309 | { |
| 2310 | Lisp_Object proc; |
| 2311 | CHECK_STRING (string, 1); |
| 2312 | proc = get_process (process); |
| 2313 | send_process (proc, XSTRING (string)->data, XSTRING (string)->size); |
| 2314 | return Qnil; |
| 2315 | } |
| 2316 | \f |
| 2317 | /* send a signal number SIGNO to PROCESS. |
| 2318 | CURRENT_GROUP means send to the process group that currently owns |
| 2319 | the terminal being used to communicate with PROCESS. |
| 2320 | This is used for various commands in shell mode. |
| 2321 | If NOMSG is zero, insert signal-announcements into process's buffers |
| 2322 | right away. |
| 2323 | |
| 2324 | If we can, we try to signal PROCESS by sending control characters |
| 2325 | down the pipe. This allows us to signal inferiors who have changed |
| 2326 | their uid, for which killpg would return an EPERM error. */ |
| 2327 | |
| 2328 | static void |
| 2329 | process_send_signal (process, signo, current_group, nomsg) |
| 2330 | Lisp_Object process; |
| 2331 | int signo; |
| 2332 | Lisp_Object current_group; |
| 2333 | int nomsg; |
| 2334 | { |
| 2335 | Lisp_Object proc; |
| 2336 | register struct Lisp_Process *p; |
| 2337 | int gid; |
| 2338 | int no_pgrp = 0; |
| 2339 | |
| 2340 | proc = get_process (process); |
| 2341 | p = XPROCESS (proc); |
| 2342 | |
| 2343 | if (!EQ (p->childp, Qt)) |
| 2344 | error ("Process %s is not a subprocess", |
| 2345 | XSTRING (p->name)->data); |
| 2346 | if (!XFASTINT (p->infd)) |
| 2347 | error ("Process %s is not active", |
| 2348 | XSTRING (p->name)->data); |
| 2349 | |
| 2350 | if (NILP (p->pty_flag)) |
| 2351 | current_group = Qnil; |
| 2352 | |
| 2353 | /* If we are using pgrps, get a pgrp number and make it negative. */ |
| 2354 | if (!NILP (current_group)) |
| 2355 | { |
| 2356 | #ifdef SIGNALS_VIA_CHARACTERS |
| 2357 | /* If possible, send signals to the entire pgrp |
| 2358 | by sending an input character to it. */ |
| 2359 | |
| 2360 | /* TERMIOS is the latest and bestest, and seems most likely to |
| 2361 | work. If the system has it, use it. */ |
| 2362 | #ifdef HAVE_TERMIOS |
| 2363 | struct termios t; |
| 2364 | |
| 2365 | switch (signo) |
| 2366 | { |
| 2367 | case SIGINT: |
| 2368 | tcgetattr (XFASTINT (p->infd), &t); |
| 2369 | send_process (proc, &t.c_cc[VINTR], 1); |
| 2370 | return; |
| 2371 | |
| 2372 | case SIGQUIT: |
| 2373 | tcgetattr (XFASTINT (p->infd), &t); |
| 2374 | send_process (proc, &t.c_cc[VQUIT], 1); |
| 2375 | return; |
| 2376 | |
| 2377 | case SIGTSTP: |
| 2378 | tcgetattr (XFASTINT (p->infd), &t); |
| 2379 | #ifdef VSWTCH |
| 2380 | send_process (proc, &t.c_cc[VSWTCH], 1); |
| 2381 | #else |
| 2382 | send_process (proc, &t.c_cc[VSUSP], 1); |
| 2383 | #endif |
| 2384 | return; |
| 2385 | } |
| 2386 | |
| 2387 | #else /* ! HAVE_TERMIOS */ |
| 2388 | |
| 2389 | /* On Berkeley descendants, the following IOCTL's retrieve the |
| 2390 | current control characters. */ |
| 2391 | #if defined (TIOCGLTC) && defined (TIOCGETC) |
| 2392 | |
| 2393 | struct tchars c; |
| 2394 | struct ltchars lc; |
| 2395 | |
| 2396 | switch (signo) |
| 2397 | { |
| 2398 | case SIGINT: |
| 2399 | ioctl (XFASTINT (p->infd), TIOCGETC, &c); |
| 2400 | send_process (proc, &c.t_intrc, 1); |
| 2401 | return; |
| 2402 | case SIGQUIT: |
| 2403 | ioctl (XFASTINT (p->infd), TIOCGETC, &c); |
| 2404 | send_process (proc, &c.t_quitc, 1); |
| 2405 | return; |
| 2406 | #ifdef SIGTSTP |
| 2407 | case SIGTSTP: |
| 2408 | ioctl (XFASTINT (p->infd), TIOCGLTC, &lc); |
| 2409 | send_process (proc, &lc.t_suspc, 1); |
| 2410 | return; |
| 2411 | #endif /* ! defined (SIGTSTP) */ |
| 2412 | } |
| 2413 | |
| 2414 | #else /* ! defined (TIOCGLTC) && defined (TIOCGETC) */ |
| 2415 | |
| 2416 | /* On SYSV descendants, the TCGETA ioctl retrieves the current control |
| 2417 | characters. */ |
| 2418 | #ifdef TCGETA |
| 2419 | struct termio t; |
| 2420 | switch (signo) |
| 2421 | { |
| 2422 | case SIGINT: |
| 2423 | ioctl (XFASTINT (p->infd), TCGETA, &t); |
| 2424 | send_process (proc, &t.c_cc[VINTR], 1); |
| 2425 | return; |
| 2426 | case SIGQUIT: |
| 2427 | ioctl (XFASTINT (p->infd), TCGETA, &t); |
| 2428 | send_process (proc, &t.c_cc[VQUIT], 1); |
| 2429 | return; |
| 2430 | #ifdef SIGTSTP |
| 2431 | case SIGTSTP: |
| 2432 | ioctl (XFASTINT (p->infd), TCGETA, &t); |
| 2433 | send_process (proc, &t.c_cc[VSWTCH], 1); |
| 2434 | return; |
| 2435 | #endif /* ! defined (SIGTSTP) */ |
| 2436 | } |
| 2437 | #else /* ! defined (TCGETA) */ |
| 2438 | Your configuration files are messed up. |
| 2439 | /* If your system configuration files define SIGNALS_VIA_CHARACTERS, |
| 2440 | you'd better be using one of the alternatives above! */ |
| 2441 | #endif /* ! defined (TCGETA) */ |
| 2442 | #endif /* ! defined (TIOCGLTC) && defined (TIOCGETC) */ |
| 2443 | #endif /* ! defined HAVE_TERMIOS */ |
| 2444 | #endif /* ! defined (SIGNALS_VIA_CHARACTERS) */ |
| 2445 | |
| 2446 | #ifdef TIOCGPGRP |
| 2447 | /* Get the pgrp using the tty itself, if we have that. |
| 2448 | Otherwise, use the pty to get the pgrp. |
| 2449 | On pfa systems, saka@pfu.fujitsu.co.JP writes: |
| 2450 | "TIOCGPGRP symbol defined in sys/ioctl.h at E50. |
| 2451 | But, TIOCGPGRP does not work on E50 ;-P works fine on E60" |
| 2452 | His patch indicates that if TIOCGPGRP returns an error, then |
| 2453 | we should just assume that p->pid is also the process group id. */ |
| 2454 | { |
| 2455 | int err; |
| 2456 | |
| 2457 | if (!NILP (p->subtty)) |
| 2458 | err = ioctl (XFASTINT (p->subtty), TIOCGPGRP, &gid); |
| 2459 | else |
| 2460 | err = ioctl (XFASTINT (p->infd), TIOCGPGRP, &gid); |
| 2461 | |
| 2462 | #ifdef pfa |
| 2463 | if (err == -1) |
| 2464 | gid = - XFASTINT (p->pid); |
| 2465 | #endif /* ! defined (pfa) */ |
| 2466 | } |
| 2467 | if (gid == -1) |
| 2468 | no_pgrp = 1; |
| 2469 | else |
| 2470 | gid = - gid; |
| 2471 | #else /* ! defined (TIOCGPGRP ) */ |
| 2472 | /* Can't select pgrps on this system, so we know that |
| 2473 | the child itself heads the pgrp. */ |
| 2474 | gid = - XFASTINT (p->pid); |
| 2475 | #endif /* ! defined (TIOCGPGRP ) */ |
| 2476 | } |
| 2477 | else |
| 2478 | gid = - XFASTINT (p->pid); |
| 2479 | |
| 2480 | switch (signo) |
| 2481 | { |
| 2482 | #ifdef SIGCONT |
| 2483 | case SIGCONT: |
| 2484 | p->raw_status_low = Qnil; |
| 2485 | p->raw_status_high = Qnil; |
| 2486 | p->status = Qrun; |
| 2487 | XSETINT (p->tick, ++process_tick); |
| 2488 | if (!nomsg) |
| 2489 | status_notify (); |
| 2490 | break; |
| 2491 | #endif /* ! defined (SIGCONT) */ |
| 2492 | case SIGINT: |
| 2493 | #ifdef VMS |
| 2494 | send_process (proc, "\003", 1); /* ^C */ |
| 2495 | goto whoosh; |
| 2496 | #endif |
| 2497 | case SIGQUIT: |
| 2498 | #ifdef VMS |
| 2499 | send_process (proc, "\031", 1); /* ^Y */ |
| 2500 | goto whoosh; |
| 2501 | #endif |
| 2502 | case SIGKILL: |
| 2503 | #ifdef VMS |
| 2504 | sys$forcex (&(XFASTINT (p->pid)), 0, 1); |
| 2505 | whoosh: |
| 2506 | #endif |
| 2507 | flush_pending_output (XFASTINT (p->infd)); |
| 2508 | break; |
| 2509 | } |
| 2510 | |
| 2511 | /* If we don't have process groups, send the signal to the immediate |
| 2512 | subprocess. That isn't really right, but it's better than any |
| 2513 | obvious alternative. */ |
| 2514 | if (no_pgrp) |
| 2515 | { |
| 2516 | kill (XFASTINT (p->pid), signo); |
| 2517 | return; |
| 2518 | } |
| 2519 | |
| 2520 | /* gid may be a pid, or minus a pgrp's number */ |
| 2521 | #ifdef TIOCSIGSEND |
| 2522 | if (!NILP (current_group)) |
| 2523 | ioctl (XFASTINT (p->infd), TIOCSIGSEND, signo); |
| 2524 | else |
| 2525 | { |
| 2526 | gid = - XFASTINT (p->pid); |
| 2527 | kill (gid, signo); |
| 2528 | } |
| 2529 | #else /* ! defined (TIOCSIGSEND) */ |
| 2530 | EMACS_KILLPG (-gid, signo); |
| 2531 | #endif /* ! defined (TIOCSIGSEND) */ |
| 2532 | } |
| 2533 | |
| 2534 | DEFUN ("interrupt-process", Finterrupt_process, Sinterrupt_process, 0, 2, 0, |
| 2535 | "Interrupt process PROCESS. May be process or name of one.\n\ |
| 2536 | PROCESS may be a process, a buffer, or the name of a process or buffer.\n\ |
| 2537 | Nil or no arg means current buffer's process.\n\ |
| 2538 | Second arg CURRENT-GROUP non-nil means send signal to\n\ |
| 2539 | the current process-group of the process's controlling terminal\n\ |
| 2540 | rather than to the process's own process group.\n\ |
| 2541 | If the process is a shell, this means interrupt current subjob\n\ |
| 2542 | rather than the shell.") |
| 2543 | (process, current_group) |
| 2544 | Lisp_Object process, current_group; |
| 2545 | { |
| 2546 | process_send_signal (process, SIGINT, current_group, 0); |
| 2547 | return process; |
| 2548 | } |
| 2549 | |
| 2550 | DEFUN ("kill-process", Fkill_process, Skill_process, 0, 2, 0, |
| 2551 | "Kill process PROCESS. May be process or name of one.\n\ |
| 2552 | See function `interrupt-process' for more details on usage.") |
| 2553 | (process, current_group) |
| 2554 | Lisp_Object process, current_group; |
| 2555 | { |
| 2556 | process_send_signal (process, SIGKILL, current_group, 0); |
| 2557 | return process; |
| 2558 | } |
| 2559 | |
| 2560 | DEFUN ("quit-process", Fquit_process, Squit_process, 0, 2, 0, |
| 2561 | "Send QUIT signal to process PROCESS. May be process or name of one.\n\ |
| 2562 | See function `interrupt-process' for more details on usage.") |
| 2563 | (process, current_group) |
| 2564 | Lisp_Object process, current_group; |
| 2565 | { |
| 2566 | process_send_signal (process, SIGQUIT, current_group, 0); |
| 2567 | return process; |
| 2568 | } |
| 2569 | |
| 2570 | DEFUN ("stop-process", Fstop_process, Sstop_process, 0, 2, 0, |
| 2571 | "Stop process PROCESS. May be process or name of one.\n\ |
| 2572 | See function `interrupt-process' for more details on usage.") |
| 2573 | (process, current_group) |
| 2574 | Lisp_Object process, current_group; |
| 2575 | { |
| 2576 | #ifndef SIGTSTP |
| 2577 | error ("no SIGTSTP support"); |
| 2578 | #else |
| 2579 | process_send_signal (process, SIGTSTP, current_group, 0); |
| 2580 | #endif |
| 2581 | return process; |
| 2582 | } |
| 2583 | |
| 2584 | DEFUN ("continue-process", Fcontinue_process, Scontinue_process, 0, 2, 0, |
| 2585 | "Continue process PROCESS. May be process or name of one.\n\ |
| 2586 | See function `interrupt-process' for more details on usage.") |
| 2587 | (process, current_group) |
| 2588 | Lisp_Object process, current_group; |
| 2589 | { |
| 2590 | #ifdef SIGCONT |
| 2591 | process_send_signal (process, SIGCONT, current_group, 0); |
| 2592 | #else |
| 2593 | error ("no SIGCONT support"); |
| 2594 | #endif |
| 2595 | return process; |
| 2596 | } |
| 2597 | |
| 2598 | DEFUN ("signal-process", Fsignal_process, Ssignal_process, |
| 2599 | 2, 2, "nProcess number: \nnSignal code: ", |
| 2600 | "Send the process with number PID the signal with code CODE.\n\ |
| 2601 | Both PID and CODE are integers.") |
| 2602 | (pid, sig) |
| 2603 | Lisp_Object pid, sig; |
| 2604 | { |
| 2605 | CHECK_NUMBER (pid, 0); |
| 2606 | CHECK_NUMBER (sig, 1); |
| 2607 | return make_number (kill (XINT (pid), XINT (sig))); |
| 2608 | } |
| 2609 | |
| 2610 | DEFUN ("process-send-eof", Fprocess_send_eof, Sprocess_send_eof, 0, 1, 0, |
| 2611 | "Make PROCESS see end-of-file in its input.\n\ |
| 2612 | Eof comes after any text already sent to it.\n\ |
| 2613 | PROCESS may be a process, a buffer, the name of a process or buffer, or\n\ |
| 2614 | nil, indicating the current buffer's process.") |
| 2615 | (process) |
| 2616 | Lisp_Object process; |
| 2617 | { |
| 2618 | Lisp_Object proc; |
| 2619 | |
| 2620 | proc = get_process (process); |
| 2621 | |
| 2622 | /* Make sure the process is really alive. */ |
| 2623 | if (! NILP (XPROCESS (proc)->raw_status_low)) |
| 2624 | update_status (XPROCESS (proc)); |
| 2625 | if (! EQ (XPROCESS (proc)->status, Qrun)) |
| 2626 | error ("Process %s not running", XSTRING (XPROCESS (proc)->name)->data); |
| 2627 | |
| 2628 | /* Sending a zero-length record is supposed to mean eof |
| 2629 | when TIOCREMOTE is turned on. */ |
| 2630 | #ifdef DID_REMOTE |
| 2631 | { |
| 2632 | char buf[1]; |
| 2633 | write (XFASTINT (XPROCESS (proc)->outfd), buf, 0); |
| 2634 | } |
| 2635 | #else /* did not do TOICREMOTE */ |
| 2636 | #ifdef VMS |
| 2637 | send_process (proc, "\032", 1); /* ^z */ |
| 2638 | #else |
| 2639 | if (!NILP (XPROCESS (proc)->pty_flag)) |
| 2640 | send_process (proc, "\004", 1); |
| 2641 | else |
| 2642 | { |
| 2643 | close (XPROCESS (proc)->outfd); |
| 2644 | XFASTINT (XPROCESS (proc)->outfd) = open (NULL_DEVICE, O_WRONLY); |
| 2645 | } |
| 2646 | #endif /* VMS */ |
| 2647 | #endif /* did not do TOICREMOTE */ |
| 2648 | return process; |
| 2649 | } |
| 2650 | |
| 2651 | /* Kill all processes associated with `buffer'. |
| 2652 | If `buffer' is nil, kill all processes */ |
| 2653 | |
| 2654 | kill_buffer_processes (buffer) |
| 2655 | Lisp_Object buffer; |
| 2656 | { |
| 2657 | Lisp_Object tail, proc; |
| 2658 | |
| 2659 | for (tail = Vprocess_alist; XGCTYPE (tail) == Lisp_Cons; |
| 2660 | tail = XCONS (tail)->cdr) |
| 2661 | { |
| 2662 | proc = XCONS (XCONS (tail)->car)->cdr; |
| 2663 | if (XGCTYPE (proc) == Lisp_Process |
| 2664 | && (NILP (buffer) || EQ (XPROCESS (proc)->buffer, buffer))) |
| 2665 | { |
| 2666 | if (NETCONN_P (proc)) |
| 2667 | deactivate_process (proc); |
| 2668 | else if (XFASTINT (XPROCESS (proc)->infd)) |
| 2669 | process_send_signal (proc, SIGHUP, Qnil, 1); |
| 2670 | } |
| 2671 | } |
| 2672 | } |
| 2673 | \f |
| 2674 | /* On receipt of a signal that a child status has changed, |
| 2675 | loop asking about children with changed statuses until |
| 2676 | the system says there are no more. |
| 2677 | All we do is change the status; |
| 2678 | we do not run sentinels or print notifications. |
| 2679 | That is saved for the next time keyboard input is done, |
| 2680 | in order to avoid timing errors. */ |
| 2681 | |
| 2682 | /** WARNING: this can be called during garbage collection. |
| 2683 | Therefore, it must not be fooled by the presence of mark bits in |
| 2684 | Lisp objects. */ |
| 2685 | |
| 2686 | /** USG WARNING: Although it is not obvious from the documentation |
| 2687 | in signal(2), on a USG system the SIGCLD handler MUST NOT call |
| 2688 | signal() before executing at least one wait(), otherwise the handler |
| 2689 | will be called again, resulting in an infinite loop. The relevant |
| 2690 | portion of the documentation reads "SIGCLD signals will be queued |
| 2691 | and the signal-catching function will be continually reentered until |
| 2692 | the queue is empty". Invoking signal() causes the kernel to reexamine |
| 2693 | the SIGCLD queue. Fred Fish, UniSoft Systems Inc. */ |
| 2694 | |
| 2695 | SIGTYPE |
| 2696 | sigchld_handler (signo) |
| 2697 | int signo; |
| 2698 | { |
| 2699 | int old_errno = errno; |
| 2700 | Lisp_Object proc; |
| 2701 | register struct Lisp_Process *p; |
| 2702 | extern EMACS_TIME *input_available_clear_time; |
| 2703 | |
| 2704 | #ifdef BSD4_1 |
| 2705 | extern int sigheld; |
| 2706 | sigheld |= sigbit (SIGCHLD); |
| 2707 | #endif |
| 2708 | |
| 2709 | while (1) |
| 2710 | { |
| 2711 | register int pid; |
| 2712 | WAITTYPE w; |
| 2713 | Lisp_Object tail; |
| 2714 | |
| 2715 | #ifdef WNOHANG |
| 2716 | #ifndef WUNTRACED |
| 2717 | #define WUNTRACED 0 |
| 2718 | #endif /* no WUNTRACED */ |
| 2719 | /* Keep trying to get a status until we get a definitive result. */ |
| 2720 | do |
| 2721 | { |
| 2722 | errno = 0; |
| 2723 | pid = wait3 (&w, WNOHANG | WUNTRACED, 0); |
| 2724 | } |
| 2725 | while (pid <= 0 && errno == EINTR); |
| 2726 | |
| 2727 | if (pid <= 0) |
| 2728 | { |
| 2729 | /* A real failure. We have done all our job, so return. */ |
| 2730 | |
| 2731 | /* USG systems forget handlers when they are used; |
| 2732 | must reestablish each time */ |
| 2733 | #ifdef USG |
| 2734 | signal (signo, sigchld_handler); /* WARNING - must come after wait3() */ |
| 2735 | #endif |
| 2736 | #ifdef BSD4_1 |
| 2737 | sigheld &= ~sigbit (SIGCHLD); |
| 2738 | sigrelse (SIGCHLD); |
| 2739 | #endif |
| 2740 | errno = old_errno; |
| 2741 | return; |
| 2742 | } |
| 2743 | #else |
| 2744 | pid = wait (&w); |
| 2745 | #endif /* no WNOHANG */ |
| 2746 | |
| 2747 | /* Find the process that signaled us, and record its status. */ |
| 2748 | |
| 2749 | p = 0; |
| 2750 | for (tail = Vprocess_alist; XSYMBOL (tail) != XSYMBOL (Qnil); tail = XCONS (tail)->cdr) |
| 2751 | { |
| 2752 | proc = XCONS (XCONS (tail)->car)->cdr; |
| 2753 | p = XPROCESS (proc); |
| 2754 | if (EQ (p->childp, Qt) && XFASTINT (p->pid) == pid) |
| 2755 | break; |
| 2756 | p = 0; |
| 2757 | } |
| 2758 | |
| 2759 | /* Look for an asynchronous process whose pid hasn't been filled |
| 2760 | in yet. */ |
| 2761 | if (p == 0) |
| 2762 | for (tail = Vprocess_alist; XSYMBOL (tail) != XSYMBOL (Qnil); tail = XCONS (tail)->cdr) |
| 2763 | { |
| 2764 | proc = XCONS (XCONS (tail)->car)->cdr; |
| 2765 | p = XPROCESS (proc); |
| 2766 | if (XTYPE (p->pid) == Lisp_Int && XINT (p->pid) == -1) |
| 2767 | break; |
| 2768 | p = 0; |
| 2769 | } |
| 2770 | |
| 2771 | /* Change the status of the process that was found. */ |
| 2772 | if (p != 0) |
| 2773 | { |
| 2774 | union { int i; WAITTYPE wt; } u; |
| 2775 | |
| 2776 | XSETINT (p->tick, ++process_tick); |
| 2777 | u.wt = w; |
| 2778 | XFASTINT (p->raw_status_low) = u.i & 0xffff; |
| 2779 | XFASTINT (p->raw_status_high) = u.i >> 16; |
| 2780 | |
| 2781 | /* If process has terminated, stop waiting for its output. */ |
| 2782 | if (WIFSIGNALED (w) || WIFEXITED (w)) |
| 2783 | if (XFASTINT (p->infd)) |
| 2784 | FD_CLR (XFASTINT (p->infd), &input_wait_mask); |
| 2785 | |
| 2786 | /* Tell wait_reading_process_input that it needs to wake up and |
| 2787 | look around. */ |
| 2788 | if (input_available_clear_time) |
| 2789 | EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0); |
| 2790 | } |
| 2791 | |
| 2792 | /* There was no asynchronous process found for that id. Check |
| 2793 | if we have a synchronous process. */ |
| 2794 | else |
| 2795 | { |
| 2796 | synch_process_alive = 0; |
| 2797 | |
| 2798 | /* Report the status of the synchronous process. */ |
| 2799 | if (WIFEXITED (w)) |
| 2800 | synch_process_retcode = WRETCODE (w); |
| 2801 | else if (WIFSIGNALED (w)) |
| 2802 | #ifndef VMS |
| 2803 | synch_process_death = (char *) sys_siglist[WTERMSIG (w)]; |
| 2804 | #else |
| 2805 | synch_process_death = sys_errlist[WTERMSIG (w)]; |
| 2806 | #endif |
| 2807 | |
| 2808 | /* Tell wait_reading_process_input that it needs to wake up and |
| 2809 | look around. */ |
| 2810 | if (input_available_clear_time) |
| 2811 | EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0); |
| 2812 | } |
| 2813 | |
| 2814 | /* On some systems, we must return right away. |
| 2815 | If any more processes want to signal us, we will |
| 2816 | get another signal. |
| 2817 | Otherwise (on systems that have WNOHANG), loop around |
| 2818 | to use up all the processes that have something to tell us. */ |
| 2819 | #if defined (USG) && ! (defined (HPUX) && defined (WNOHANG)) |
| 2820 | #ifdef USG |
| 2821 | signal (signo, sigchld_handler); |
| 2822 | #endif |
| 2823 | errno = old_errno; |
| 2824 | return; |
| 2825 | #endif /* USG, but not HPUX with WNOHANG */ |
| 2826 | } |
| 2827 | } |
| 2828 | \f |
| 2829 | |
| 2830 | static Lisp_Object |
| 2831 | exec_sentinel_unwind (data) |
| 2832 | Lisp_Object data; |
| 2833 | { |
| 2834 | XPROCESS (XCONS (data)->car)->sentinel = XCONS (data)->cdr; |
| 2835 | return Qnil; |
| 2836 | } |
| 2837 | |
| 2838 | static void |
| 2839 | exec_sentinel (proc, reason) |
| 2840 | Lisp_Object proc, reason; |
| 2841 | { |
| 2842 | Lisp_Object sentinel; |
| 2843 | register struct Lisp_Process *p = XPROCESS (proc); |
| 2844 | int count = specpdl_ptr - specpdl; |
| 2845 | |
| 2846 | sentinel = p->sentinel; |
| 2847 | if (NILP (sentinel)) |
| 2848 | return; |
| 2849 | |
| 2850 | /* Zilch the sentinel while it's running, to avoid recursive invocations; |
| 2851 | assure that it gets restored no matter how the sentinel exits. */ |
| 2852 | p->sentinel = Qnil; |
| 2853 | record_unwind_protect (exec_sentinel_unwind, Fcons (proc, sentinel)); |
| 2854 | /* Inhibit quit so that random quits don't screw up a running filter. */ |
| 2855 | specbind (Qinhibit_quit, Qt); |
| 2856 | call2 (sentinel, proc, reason); |
| 2857 | unbind_to (count); |
| 2858 | } |
| 2859 | |
| 2860 | /* Report all recent events of a change in process status |
| 2861 | (either run the sentinel or output a message). |
| 2862 | This is done while Emacs is waiting for keyboard input. */ |
| 2863 | |
| 2864 | status_notify () |
| 2865 | { |
| 2866 | register Lisp_Object proc, buffer; |
| 2867 | Lisp_Object tail = Qnil; |
| 2868 | Lisp_Object msg = Qnil; |
| 2869 | struct gcpro gcpro1, gcpro2; |
| 2870 | |
| 2871 | /* We need to gcpro tail; if read_process_output calls a filter |
| 2872 | which deletes a process and removes the cons to which tail points |
| 2873 | from Vprocess_alist, and then causes a GC, tail is an unprotected |
| 2874 | reference. */ |
| 2875 | GCPRO2 (tail, msg); |
| 2876 | |
| 2877 | for (tail = Vprocess_alist; !NILP (tail); tail = Fcdr (tail)) |
| 2878 | { |
| 2879 | Lisp_Object symbol; |
| 2880 | register struct Lisp_Process *p; |
| 2881 | |
| 2882 | proc = Fcdr (Fcar (tail)); |
| 2883 | p = XPROCESS (proc); |
| 2884 | |
| 2885 | if (XINT (p->tick) != XINT (p->update_tick)) |
| 2886 | { |
| 2887 | XSETINT (p->update_tick, XINT (p->tick)); |
| 2888 | |
| 2889 | /* If process is still active, read any output that remains. */ |
| 2890 | if (XFASTINT (p->infd)) |
| 2891 | while (read_process_output (proc, XFASTINT (p->infd)) > 0); |
| 2892 | |
| 2893 | buffer = p->buffer; |
| 2894 | |
| 2895 | /* Get the text to use for the message. */ |
| 2896 | if (!NILP (p->raw_status_low)) |
| 2897 | update_status (p); |
| 2898 | msg = status_message (p->status); |
| 2899 | |
| 2900 | /* If process is terminated, deactivate it or delete it. */ |
| 2901 | symbol = p->status; |
| 2902 | if (XTYPE (p->status) == Lisp_Cons) |
| 2903 | symbol = XCONS (p->status)->car; |
| 2904 | |
| 2905 | if (EQ (symbol, Qsignal) || EQ (symbol, Qexit) |
| 2906 | || EQ (symbol, Qclosed)) |
| 2907 | { |
| 2908 | if (delete_exited_processes) |
| 2909 | remove_process (proc); |
| 2910 | else |
| 2911 | deactivate_process (proc); |
| 2912 | } |
| 2913 | |
| 2914 | /* Now output the message suitably. */ |
| 2915 | if (!NILP (p->sentinel)) |
| 2916 | exec_sentinel (proc, msg); |
| 2917 | /* Don't bother with a message in the buffer |
| 2918 | when a process becomes runnable. */ |
| 2919 | else if (!EQ (symbol, Qrun) && !NILP (buffer)) |
| 2920 | { |
| 2921 | Lisp_Object ro = XBUFFER (buffer)->read_only; |
| 2922 | Lisp_Object tem; |
| 2923 | struct buffer *old = current_buffer; |
| 2924 | int opoint; |
| 2925 | |
| 2926 | /* Avoid error if buffer is deleted |
| 2927 | (probably that's why the process is dead, too) */ |
| 2928 | if (NILP (XBUFFER (buffer)->name)) |
| 2929 | continue; |
| 2930 | Fset_buffer (buffer); |
| 2931 | opoint = point; |
| 2932 | /* Insert new output into buffer |
| 2933 | at the current end-of-output marker, |
| 2934 | thus preserving logical ordering of input and output. */ |
| 2935 | if (XMARKER (p->mark)->buffer) |
| 2936 | SET_PT (marker_position (p->mark)); |
| 2937 | else |
| 2938 | SET_PT (ZV); |
| 2939 | if (point <= opoint) |
| 2940 | opoint += XSTRING (msg)->size + XSTRING (p->name)->size + 10; |
| 2941 | |
| 2942 | tem = current_buffer->read_only; |
| 2943 | current_buffer->read_only = Qnil; |
| 2944 | insert_string ("\nProcess "); |
| 2945 | Finsert (1, &p->name); |
| 2946 | insert_string (" "); |
| 2947 | Finsert (1, &msg); |
| 2948 | current_buffer->read_only = tem; |
| 2949 | Fset_marker (p->mark, make_number (point), p->buffer); |
| 2950 | |
| 2951 | SET_PT (opoint); |
| 2952 | set_buffer_internal (old); |
| 2953 | } |
| 2954 | } |
| 2955 | } /* end for */ |
| 2956 | |
| 2957 | update_mode_lines++; /* in case buffers use %s in mode-line-format */ |
| 2958 | redisplay_preserve_echo_area (); |
| 2959 | |
| 2960 | update_tick = process_tick; |
| 2961 | |
| 2962 | UNGCPRO; |
| 2963 | } |
| 2964 | \f |
| 2965 | init_process () |
| 2966 | { |
| 2967 | register int i; |
| 2968 | |
| 2969 | #ifdef SIGCHLD |
| 2970 | #ifndef CANNOT_DUMP |
| 2971 | if (! noninteractive || initialized) |
| 2972 | #endif |
| 2973 | signal (SIGCHLD, sigchld_handler); |
| 2974 | #endif |
| 2975 | |
| 2976 | FD_ZERO (&input_wait_mask); |
| 2977 | FD_SET (0, &input_wait_mask); |
| 2978 | Vprocess_alist = Qnil; |
| 2979 | for (i = 0; i < MAXDESC; i++) |
| 2980 | { |
| 2981 | chan_process[i] = Qnil; |
| 2982 | proc_buffered_char[i] = -1; |
| 2983 | } |
| 2984 | } |
| 2985 | #if 0 |
| 2986 | DEFUN ("process-connection", Fprocess_connection, Sprocess_connection, 0, 1, 0, |
| 2987 | "Return the connection type of `PROCESS'. This can be nil (pipe),\n\ |
| 2988 | t or pty (pty) or stream (socket connection).") |
| 2989 | (process) |
| 2990 | Lisp_Object process; |
| 2991 | { |
| 2992 | return XPROCESS (process)->type; |
| 2993 | } |
| 2994 | #endif |
| 2995 | syms_of_process () |
| 2996 | { |
| 2997 | #ifdef HAVE_SOCKETS |
| 2998 | stream_process = intern ("stream"); |
| 2999 | #endif |
| 3000 | Qprocessp = intern ("processp"); |
| 3001 | staticpro (&Qprocessp); |
| 3002 | Qrun = intern ("run"); |
| 3003 | staticpro (&Qrun); |
| 3004 | Qstop = intern ("stop"); |
| 3005 | staticpro (&Qstop); |
| 3006 | Qsignal = intern ("signal"); |
| 3007 | staticpro (&Qsignal); |
| 3008 | |
| 3009 | /* Qexit is already staticpro'd by syms_of_eval; don't staticpro it |
| 3010 | here again. |
| 3011 | |
| 3012 | Qexit = intern ("exit"); |
| 3013 | staticpro (&Qexit); */ |
| 3014 | |
| 3015 | Qopen = intern ("open"); |
| 3016 | staticpro (&Qopen); |
| 3017 | Qclosed = intern ("closed"); |
| 3018 | staticpro (&Qclosed); |
| 3019 | |
| 3020 | staticpro (&Vprocess_alist); |
| 3021 | |
| 3022 | DEFVAR_BOOL ("delete-exited-processes", &delete_exited_processes, |
| 3023 | "*Non-nil means delete processes immediately when they exit.\n\ |
| 3024 | nil means don't delete them until `list-processes' is run."); |
| 3025 | |
| 3026 | delete_exited_processes = 1; |
| 3027 | |
| 3028 | DEFVAR_LISP ("process-connection-type", &Vprocess_connection_type, |
| 3029 | "Control type of device used to communicate with subprocesses.\n\ |
| 3030 | Values are nil to use a pipe, and t or 'pty for a pty. Note that if\n\ |
| 3031 | pty's are not available, this variable will be ignored. The value takes\n\ |
| 3032 | effect when `start-process' is called."); |
| 3033 | Vprocess_connection_type = Qt; |
| 3034 | |
| 3035 | defsubr (&Sprocessp); |
| 3036 | defsubr (&Sget_process); |
| 3037 | defsubr (&Sget_buffer_process); |
| 3038 | defsubr (&Sdelete_process); |
| 3039 | defsubr (&Sprocess_status); |
| 3040 | defsubr (&Sprocess_exit_status); |
| 3041 | defsubr (&Sprocess_id); |
| 3042 | defsubr (&Sprocess_name); |
| 3043 | defsubr (&Sprocess_command); |
| 3044 | defsubr (&Sset_process_buffer); |
| 3045 | defsubr (&Sprocess_buffer); |
| 3046 | defsubr (&Sprocess_mark); |
| 3047 | defsubr (&Sset_process_filter); |
| 3048 | defsubr (&Sprocess_filter); |
| 3049 | defsubr (&Sset_process_sentinel); |
| 3050 | defsubr (&Sprocess_sentinel); |
| 3051 | defsubr (&Sprocess_kill_without_query); |
| 3052 | defsubr (&Slist_processes); |
| 3053 | defsubr (&Sprocess_list); |
| 3054 | defsubr (&Sstart_process); |
| 3055 | #ifdef HAVE_SOCKETS |
| 3056 | defsubr (&Sopen_network_stream); |
| 3057 | #endif /* HAVE_SOCKETS */ |
| 3058 | defsubr (&Saccept_process_output); |
| 3059 | defsubr (&Sprocess_send_region); |
| 3060 | defsubr (&Sprocess_send_string); |
| 3061 | defsubr (&Sinterrupt_process); |
| 3062 | defsubr (&Skill_process); |
| 3063 | defsubr (&Squit_process); |
| 3064 | defsubr (&Sstop_process); |
| 3065 | defsubr (&Scontinue_process); |
| 3066 | defsubr (&Sprocess_send_eof); |
| 3067 | defsubr (&Ssignal_process); |
| 3068 | defsubr (&Swaiting_for_user_input_p); |
| 3069 | /* defsubr (&Sprocess_connection); */ |
| 3070 | } |
| 3071 | |
| 3072 | \f |
| 3073 | #else /* not subprocesses */ |
| 3074 | |
| 3075 | #include <sys/types.h> |
| 3076 | #include <errno.h> |
| 3077 | |
| 3078 | #include "lisp.h" |
| 3079 | #include "systime.h" |
| 3080 | #include "termopts.h" |
| 3081 | |
| 3082 | extern int frame_garbaged; |
| 3083 | |
| 3084 | |
| 3085 | /* As described above, except assuming that there are no subprocesses: |
| 3086 | |
| 3087 | Wait for timeout to elapse and/or keyboard input to be available. |
| 3088 | |
| 3089 | time_limit is: |
| 3090 | timeout in seconds, or |
| 3091 | zero for no limit, or |
| 3092 | -1 means gobble data immediately available but don't wait for any. |
| 3093 | |
| 3094 | read_kbd is a Lisp_Object: |
| 3095 | 0 to ignore keyboard input, or |
| 3096 | 1 to return when input is available, or |
| 3097 | -1 means caller will actually read the input, so don't throw to |
| 3098 | the quit handler. |
| 3099 | We know that read_kbd will never be a Lisp_Process, since |
| 3100 | `subprocesses' isn't defined. |
| 3101 | |
| 3102 | do_display != 0 means redisplay should be done to show subprocess |
| 3103 | output that arrives. This version of the function ignores it. |
| 3104 | |
| 3105 | Return true iff we received input from any process. */ |
| 3106 | |
| 3107 | int |
| 3108 | wait_reading_process_input (time_limit, microsecs, read_kbd, do_display) |
| 3109 | int time_limit, microsecs; |
| 3110 | Lisp_Object read_kbd; |
| 3111 | int do_display; |
| 3112 | { |
| 3113 | EMACS_TIME end_time, timeout, *timeout_p; |
| 3114 | int waitchannels; |
| 3115 | |
| 3116 | /* What does time_limit really mean? */ |
| 3117 | if (time_limit || microsecs) |
| 3118 | { |
| 3119 | /* It's not infinite. */ |
| 3120 | timeout_p = &timeout; |
| 3121 | |
| 3122 | if (time_limit == -1) |
| 3123 | /* In fact, it's zero. */ |
| 3124 | EMACS_SET_SECS_USECS (timeout, 0, 0); |
| 3125 | else |
| 3126 | EMACS_SET_SECS_USECS (timeout, time_limit, microsecs); |
| 3127 | |
| 3128 | /* How far in the future is that? */ |
| 3129 | EMACS_GET_TIME (end_time); |
| 3130 | EMACS_ADD_TIME (end_time, end_time, timeout); |
| 3131 | } |
| 3132 | else |
| 3133 | /* It's infinite. */ |
| 3134 | timeout_p = 0; |
| 3135 | |
| 3136 | /* Turn off periodic alarms (in case they are in use) |
| 3137 | because the select emulator uses alarms. */ |
| 3138 | stop_polling (); |
| 3139 | |
| 3140 | for (;;) |
| 3141 | { |
| 3142 | int nfds; |
| 3143 | |
| 3144 | waitchannels = XINT (read_kbd) ? 1 : 0; |
| 3145 | |
| 3146 | /* If calling from keyboard input, do not quit |
| 3147 | since we want to return C-g as an input character. |
| 3148 | Otherwise, do pending quit if requested. */ |
| 3149 | if (XINT (read_kbd) >= 0) |
| 3150 | QUIT; |
| 3151 | |
| 3152 | if (timeout_p) |
| 3153 | { |
| 3154 | EMACS_GET_TIME (*timeout_p); |
| 3155 | EMACS_SUB_TIME (*timeout_p, end_time, *timeout_p); |
| 3156 | if (EMACS_TIME_NEG_P (*timeout_p)) |
| 3157 | break; |
| 3158 | } |
| 3159 | |
| 3160 | /* Cause C-g and alarm signals to take immediate action, |
| 3161 | and cause input available signals to zero out timeout. */ |
| 3162 | if (XINT (read_kbd) < 0) |
| 3163 | set_waiting_for_input (&timeout); |
| 3164 | |
| 3165 | /* If a frame has been newly mapped and needs updating, |
| 3166 | reprocess its display stuff. */ |
| 3167 | if (frame_garbaged) |
| 3168 | redisplay_preserve_echo_area (); |
| 3169 | |
| 3170 | if (XINT (read_kbd) && detect_input_pending ()) |
| 3171 | nfds = 0; |
| 3172 | else |
| 3173 | nfds = select (1, &waitchannels, 0, 0, timeout_p); |
| 3174 | |
| 3175 | /* Make C-g and alarm signals set flags again */ |
| 3176 | clear_waiting_for_input (); |
| 3177 | |
| 3178 | /* If we woke up due to SIGWINCH, actually change size now. */ |
| 3179 | do_pending_window_change (); |
| 3180 | |
| 3181 | if (nfds == -1) |
| 3182 | { |
| 3183 | /* If the system call was interrupted, then go around the |
| 3184 | loop again. */ |
| 3185 | if (errno == EINTR) |
| 3186 | waitchannels = 0; |
| 3187 | } |
| 3188 | #ifdef sun |
| 3189 | else if (nfds > 0 && (waitchannels & 1) && interrupt_input) |
| 3190 | /* System sometimes fails to deliver SIGIO. */ |
| 3191 | kill (getpid (), SIGIO); |
| 3192 | #endif |
| 3193 | if (XINT (read_kbd) && interrupt_input && (waitchannels & 1)) |
| 3194 | kill (0, SIGIO); |
| 3195 | |
| 3196 | /* If we have timed out (nfds == 0) or found some input (nfds > 0), |
| 3197 | we should exit. */ |
| 3198 | if (nfds >= 0) |
| 3199 | break; |
| 3200 | } |
| 3201 | |
| 3202 | start_polling (); |
| 3203 | |
| 3204 | return 0; |
| 3205 | } |
| 3206 | |
| 3207 | |
| 3208 | DEFUN ("get-buffer-process", Fget_buffer_process, Sget_buffer_process, 1, 1, 0, |
| 3209 | "Return the (or, a) process associated with BUFFER.\n\ |
| 3210 | This copy of Emacs has not been built to support subprocesses, so this\n\ |
| 3211 | function always returns nil.") |
| 3212 | (name) |
| 3213 | register Lisp_Object name; |
| 3214 | { |
| 3215 | return Qnil; |
| 3216 | } |
| 3217 | |
| 3218 | /* Kill all processes associated with `buffer'. |
| 3219 | If `buffer' is nil, kill all processes. |
| 3220 | Since we have no subprocesses, this does nothing. */ |
| 3221 | |
| 3222 | kill_buffer_processes (buffer) |
| 3223 | Lisp_Object buffer; |
| 3224 | { |
| 3225 | } |
| 3226 | |
| 3227 | init_process () |
| 3228 | { |
| 3229 | } |
| 3230 | |
| 3231 | syms_of_process () |
| 3232 | { |
| 3233 | defsubr (&Sget_buffer_process); |
| 3234 | } |
| 3235 | |
| 3236 | \f |
| 3237 | #endif /* not subprocesses */ |