sysdep.c 115 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Interfaces to system-dependent kernel and library entries.
2
   Copyright (C) 1985, 86, 87, 88, 93, 94 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
3 4 5 6 7

This file is part of GNU Emacs.

GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
8
the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING.  If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */


#include <signal.h>
#include <setjmp.h>

24
#include <config.h>
Jim Blandy's avatar
Jim Blandy committed
25
#include "lisp.h"
26
#include "blockinput.h"
Jim Blandy's avatar
Jim Blandy committed
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
#undef NULL

#define min(x,y) ((x) > (y) ? (y) : (x))

/* In this file, open, read and write refer to the system calls,
   not our sugared interfaces  sys_open, sys_read and sys_write.
   Contrariwise, for systems where we use the system calls directly,
   define sys_read, etc. here as aliases for them.  */
#ifndef read
#define sys_read read
#define sys_write write
#endif /* `read' is not a macro */

#undef read
#undef write

#ifndef close
#define sys_close close
#else 
#undef close
#endif

#ifndef open
#define sys_open open
#else /* `open' is a macro */
#undef open
#endif /* `open' is a macro */

55 56 57 58 59 60 61
/* Does anyone other than VMS need this? */
#ifndef fwrite
#define sys_fwrite fwrite
#else
#undef fwrite
#endif

62 63 64 65
#ifndef HAVE_H_ERRNO
extern int h_errno;
#endif

Jim Blandy's avatar
Jim Blandy committed
66 67 68 69 70
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>

71 72 73 74 75 76 77
#ifdef MSDOS	/* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
#include <dos.h>
#include "dosfns.h"
#include "msdos.h"
#include <sys/param.h>
#endif

Jim Blandy's avatar
Jim Blandy committed
78 79
extern int errno;

80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113
#ifdef VMS
#include <rms.h>
#include <ttdef.h>
#include <tt2def.h>
#include <iodef.h>
#include <ssdef.h>
#include <descrip.h>
#include <fibdef.h>
#include <atrdef.h>
#include <ctype.h>
#include <string.h>
#ifdef __GNUC__
#include <sys/file.h>
#else
#include <file.h>
#endif
#undef F_SETFL
#ifndef RAB$C_BID
#include <rab.h>
#endif
#define	MAXIOSIZE ( 32 * PAGESIZE )	/* Don't I/O more than 32 blocks at a time */
#endif /* VMS */

#ifndef BSD4_1
#ifdef BSD /* this is done this way to avoid defined (BSD) || defined (USG)
	      because the vms compiler doesn't grok `defined' */
#include <fcntl.h>
#endif
#ifdef USG
#ifndef USG5
#include <fcntl.h>
#endif
#endif
#endif /* not 4.1 bsd */
Jim Blandy's avatar
Jim Blandy committed
114

115 116 117 118 119 120 121 122
#ifdef BROKEN_FASYNC
/* On some systems (DGUX comes to mind real fast) FASYNC causes
   background writes to the terminal to stop all processes in the
   process group when invoked under the csh (and probably any shell
   with job control). This stops Emacs dead in its tracks when coming
   up under X11. */
#undef FASYNC
#endif
Jim Blandy's avatar
Jim Blandy committed
123

124
#ifndef MSDOS
Jim Blandy's avatar
Jim Blandy committed
125
#include <sys/ioctl.h>
126
#endif
127
#include "systty.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
128
#include "syswait.h"
Jim Blandy's avatar
Jim Blandy committed
129 130 131

#ifdef BROKEN_TIOCGWINSZ
#undef TIOCGWINSZ
132
#undef TIOCSWINSZ
Jim Blandy's avatar
Jim Blandy committed
133 134 135 136 137 138 139 140
#endif

#ifdef USG
#include <sys/utsname.h>
#include <string.h>
#ifndef MEMORY_IN_STRING_H
#include <memory.h>
#endif
141
#if defined (TIOCGWINSZ) || defined (ISC4_0)
Jim Blandy's avatar
Jim Blandy committed
142 143 144 145 146 147 148
#ifdef NEED_SIOCTL
#include <sys/sioctl.h>
#endif
#ifdef NEED_PTEM_H
#include <sys/stream.h>
#include <sys/ptem.h>
#endif
149
#endif /* TIOCGWINSZ or ISC4_0 */
Jim Blandy's avatar
Jim Blandy committed
150 151 152 153
#endif /* USG */

extern int quit_char;

Jim Blandy's avatar
Jim Blandy committed
154
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
155 156 157 158 159 160 161 162 163 164 165
#include "window.h"
#include "termhooks.h"
#include "termchar.h"
#include "termopts.h"
#include "dispextern.h"
#include "process.h"

#ifdef NONSYSTEM_DIR_LIBRARY
#include "ndir.h"
#endif /* NONSYSTEM_DIR_LIBRARY */

Jim Blandy's avatar
Jim Blandy committed
166 167
#include "syssignal.h"
#include "systime.h"
Jim Blandy's avatar
Jim Blandy committed
168

169 170 171 172 173 174 175 176 177
/* LPASS8 is new in 4.3, and makes cbreak mode provide all 8 bits.  */
#ifndef LPASS8
#define LPASS8 0
#endif

#ifdef BSD4_1
#define LNOFLSH 0100000
#endif

Jim Blandy's avatar
Jim Blandy committed
178 179 180 181 182 183 184 185 186 187 188 189
static int baud_convert[] =
#ifdef BAUD_CONVERT
  BAUD_CONVERT;
#else
  {
    0, 50, 75, 110, 135, 150, 200, 300, 600, 1200,
    1800, 2400, 4800, 9600, 19200, 38400
  };
#endif

extern short ospeed;

Jim Blandy's avatar
Jim Blandy committed
190
/* The file descriptor for Emacs's input terminal.
191
   Under Unix, this is normaly zero except when using X;
Jim Blandy's avatar
Jim Blandy committed
192 193 194
   under VMS, we place the input channel number here.
   This allows us to write more code that works for both VMS and Unix.  */
static int input_fd;
195 196 197 198 199 200 201 202 203 204 205

/* Specify a different file descriptor for further input operations.  */

void
change_input_fd (fd)
     int fd;
{
  input_fd = fd;
}

/* Discard pending input on descriptor input_fd.  */
Jim Blandy's avatar
Jim Blandy committed
206

Jim Blandy's avatar
Jim Blandy committed
207 208
discard_tty_input ()
{
Jim Blandy's avatar
Jim Blandy committed
209
  struct emacs_tty buf;
Jim Blandy's avatar
Jim Blandy committed
210 211 212 213 214 215 216 217 218 219 220

  if (noninteractive)
    return;

  /* Discarding input is not safe when the input could contain
     replies from the X server.  So don't do it.  */
  if (read_socket_hook)
    return;

#ifdef VMS
  end_kbd_input ();
Jim Blandy's avatar
Jim Blandy committed
221 222
  SYS$QIOW (0, input_fd, IO$_READVBLK|IO$M_PURGE, input_iosb, 0, 0,
	    &buf.main, 0, 0, terminator_mask, 0, 0);
Jim Blandy's avatar
Jim Blandy committed
223 224 225 226 227
  queue_kbd_input ();
#else /* not VMS */
#ifdef APOLLO
  {
    int zero = 0;
228
    ioctl (input_fd, TIOCFLUSH, &zero);
Jim Blandy's avatar
Jim Blandy committed
229 230
  }
#else /* not Apollo */
231 232 233 234
#ifdef MSDOS	/* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
  while (dos_keyread () != -1)
  	;
#else /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
235 236
  EMACS_GET_TTY (input_fd, &buf);
  EMACS_SET_TTY (input_fd, &buf, 0);
237
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
238 239 240 241 242 243
#endif /* not Apollo */
#endif /* not VMS */
}

#ifdef SIGTSTP

244 245 246
/* Arrange for character C to be read as the next input from
   the terminal.  */

Jim Blandy's avatar
Jim Blandy committed
247 248 249 250 251
stuff_char (c)
     char c;
{
/* Should perhaps error if in batch mode */
#ifdef TIOCSTI
252
  ioctl (input_fd, TIOCSTI, &c);
Jim Blandy's avatar
Jim Blandy committed
253
#else /* no TIOCSTI */
254
  error ("Cannot stuff terminal input characters in this version of Unix");
Jim Blandy's avatar
Jim Blandy committed
255 256 257 258
#endif /* no TIOCSTI */
}

#endif /* SIGTSTP */
259

Jim Blandy's avatar
Jim Blandy committed
260 261 262 263 264 265
init_baud_rate ()
{
  if (noninteractive)
    ospeed = 0;
  else
    {
266 267 268
#ifdef MSDOS
    ospeed = 15;
#else
Jim Blandy's avatar
Jim Blandy committed
269
#ifdef VMS
Jim Blandy's avatar
Jim Blandy committed
270 271 272
      struct sensemode sg;

      SYS$QIOW (0, input_fd, IO$_SENSEMODE, &sg, 0, 0,
Jim Blandy's avatar
Jim Blandy committed
273
		&sg.class, 12, 0, 0, 0, 0 );
Jim Blandy's avatar
Jim Blandy committed
274 275
      ospeed = sg.xmit_baud;
#else /* not VMS */
276 277
#ifdef HAVE_TERMIOS
      struct termios sg;
Jim Blandy's avatar
Jim Blandy committed
278

279
      sg.c_cflag = B9600;
280
      tcgetattr (input_fd, &sg);
281
      ospeed = cfgetospeed (&sg);
282 283 284
#else /* neither VMS nor TERMIOS */
#ifdef HAVE_TERMIO
      struct termio sg;
Jim Blandy's avatar
Jim Blandy committed
285

286
      sg.c_cflag = B9600;
287
#ifdef HAVE_TCATTR
288
      tcgetattr (input_fd, &sg);
289
#else
290
      ioctl (input_fd, TCGETA, &sg);
291
#endif
Jim Blandy's avatar
Jim Blandy committed
292
      ospeed = sg.c_cflag & CBAUD;
293
#else /* neither VMS nor TERMIOS nor TERMIO */
Jim Blandy's avatar
Jim Blandy committed
294 295 296
      struct sgttyb sg;
      
      sg.sg_ospeed = B9600;
297
      if (ioctl (input_fd, TIOCGETP, &sg) < 0)
298
	abort ();
Jim Blandy's avatar
Jim Blandy committed
299 300
      ospeed = sg.sg_ospeed;
#endif /* not HAVE_TERMIO */
301
#endif /* not HAVE_TERMIOS */
Jim Blandy's avatar
Jim Blandy committed
302
#endif /* not VMS */
303
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320
    }
   
  baud_rate = (ospeed < sizeof baud_convert / sizeof baud_convert[0]
 	       ? baud_convert[ospeed] : 9600);
  if (baud_rate == 0)
    baud_rate = 1200;
}

/*ARGSUSED*/
set_exclusive_use (fd)
     int fd;
{
#ifdef FIOCLEX
  ioctl (fd, FIOCLEX, 0);
#endif
  /* Ok to do nothing if this feature does not exist */
}
321

Jim Blandy's avatar
Jim Blandy committed
322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354
#ifndef subprocesses

wait_without_blocking ()
{
#ifdef BSD
  wait3 (0, WNOHANG | WUNTRACED, 0);
#else
  croak ("wait_without_blocking");
#endif
  synch_process_alive = 0;
}

#endif /* not subprocesses */

int wait_debugging;   /* Set nonzero to make following function work under dbx
		         (at least for bsd).  */

SIGTYPE
wait_for_termination_signal ()
{}

/* Wait for subprocess with process id `pid' to terminate and
   make sure it will get eliminated (not remain forever as a zombie) */

wait_for_termination (pid)
     int pid;
{
  while (1)
    {
#ifdef subprocesses
#ifdef VMS
      int status;

355
      status = SYS$FORCEX (&pid, 0, 0);
Jim Blandy's avatar
Jim Blandy committed
356 357
      break;
#else /* not VMS */
358
#if defined (BSD) || (defined (HPUX) && !defined (HPUX_5))
359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376
      /* Note that kill returns -1 even if the process is just a zombie now.
	 But inevitably a SIGCHLD interrupt should be generated
	 and child_sig will do wait3 and make the process go away. */
      /* There is some indication that there is a bug involved with
	 termination of subprocesses, perhaps involving a kernel bug too,
	 but no idea what it is.  Just as a hunch we signal SIGCHLD to see
	 if that causes the problem to go away or get worse.  */
      sigsetmask (sigmask (SIGCHLD));
      if (0 > kill (pid, 0))
        {
	  sigsetmask (SIGEMPTYMASK);
	  kill (getpid (), SIGCHLD);
	  break;
	}
      if (wait_debugging)
	sleep (1);
      else
	sigpause (SIGEMPTYMASK);
377 378
#else /* not BSD, and not HPUX version >= 6 */
#if defined (UNIPLUS)
379 380 381
      if (0 > kill (pid, 0))
	break;
      wait (0);
382
#else /* neither BSD nor UNIPLUS: random sysV */
383 384 385 386 387 388 389
#ifdef POSIX_SIGNALS	/* would this work for LINUX as well? */
      sigblock (sigmask (SIGCHLD));
      if (0 > kill (pid, 0))
	{
	  sigunblock (sigmask (SIGCHLD));
	  break;
	}
390
      sigpause (SIGEMPTYMASK);
391
#else /* not POSIX_SIGNALS */
392 393 394 395 396 397 398 399 400 401
#ifdef HAVE_SYSV_SIGPAUSE
      sighold (SIGCHLD);
      if (0 > kill (pid, 0))
	{
	  sigrelse (SIGCHLD);
	  break;
	}
      sigpause (SIGCHLD);
#else /* not HAVE_SYSV_SIGPAUSE */
      if (0 > kill (pid, 0))
Jim Blandy's avatar
Jim Blandy committed
402
	break;
403 404 405 406 407
      /* Using sleep instead of pause avoids timing error.
	 If the inferior dies just before the sleep,
	 we lose just one second.  */
      sleep (1);
#endif /* not HAVE_SYSV_SIGPAUSE */
408
#endif /* not POSIX_SIGNALS */
409 410
#endif /* not UNIPLUS */
#endif /* not BSD, and not HPUX version >= 6 */
Jim Blandy's avatar
Jim Blandy committed
411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453
#endif /* not VMS */
#else /* not subprocesses */
#ifndef BSD4_1
      if (kill (pid, 0) < 0)
	break;
      wait (0);
#else /* BSD4_1 */
      int status;
      status = wait (0);
      if (status == pid || status == -1)
	break;
#endif /* BSD4_1 */
#endif /* not subprocesses */
    }
}

#ifdef subprocesses

/*
 *	flush any pending output
 *      (may flush input as well; it does not matter the way we use it)
 */
 
flush_pending_output (channel)
     int channel;
{
#ifdef HAVE_TERMIOS
  /* If we try this, we get hit with SIGTTIN, because
     the child's tty belongs to the child's pgrp. */
#else
#ifdef TCFLSH
  ioctl (channel, TCFLSH, 1);
#else
#ifdef TIOCFLUSH
  int zero = 0;
  /* 3rd arg should be ignored
     but some 4.2 kernels actually want the address of an int
     and nonzero means something different.  */
  ioctl (channel, TIOCFLUSH, &zero);
#endif
#endif
#endif
}
454

Jim Blandy's avatar
Jim Blandy committed
455 456 457 458 459 460 461 462 463
#ifndef VMS
/*  Set up the terminal at the other end of a pseudo-terminal that
    we will be controlling an inferior through.
    It should not echo or do line-editing, since that is done
    in Emacs.  No padding needed for insertion into an Emacs buffer.  */

child_setup_tty (out)
     int out;
{
464
#ifndef MSDOS
Jim Blandy's avatar
Jim Blandy committed
465 466 467
  struct emacs_tty s;

  EMACS_GET_TTY (out, &s);
Jim Blandy's avatar
Jim Blandy committed
468

469
#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
Jim Blandy's avatar
Jim Blandy committed
470 471
  s.main.c_oflag |= OPOST;	/* Enable output postprocessing */
  s.main.c_oflag &= ~ONLCR;	/* Disable map of NL to CR-NL on output */
472
#ifdef NLDLY
Jim Blandy's avatar
Jim Blandy committed
473 474
  s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
  				/* No output delays */
475
#endif
Jim Blandy's avatar
Jim Blandy committed
476 477
  s.main.c_lflag &= ~ECHO;	/* Disable echo */
  s.main.c_lflag |= ISIG;	/* Enable signals */
478 479 480
#ifdef IUCLC
  s.main.c_iflag &= ~IUCLC;	/* Disable downcasing on input.  */
#endif
481
#ifdef OLCUC
482 483
  s.main.c_oflag &= ~OLCUC;	/* Disable upcasing on output.  */
#endif
484
  s.main.c_cflag = (s.main.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
Jim Blandy's avatar
Jim Blandy committed
485
#if 0
486
  /* Said to be unnecessary:  */
Jim Blandy's avatar
Jim Blandy committed
487 488 489 490 491 492 493 494 495
  s.main.c_cc[VMIN] = 1;	/* minimum number of characters to accept  */
  s.main.c_cc[VTIME] = 0;	/* wait forever for at least 1 character  */
#endif

  s.main.c_lflag |= ICANON;	/* Enable erase/kill and eof processing */
  s.main.c_cc[VEOF] = 04;	/* insure that EOF is Control-D */
  s.main.c_cc[VERASE] = 0377;	/* disable erase processing */
  s.main.c_cc[VKILL] = 0377;	/* disable kill processing */

Jim Blandy's avatar
Jim Blandy committed
496
#ifdef HPUX
Jim Blandy's avatar
Jim Blandy committed
497
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
498
#endif /* HPUX */
Jim Blandy's avatar
Jim Blandy committed
499

Jim Blandy's avatar
Jim Blandy committed
500 501 502
#ifdef AIX
/* AIX enhanced edit loses NULs, so disable it */
#ifndef IBMR2AIX
Jim Blandy's avatar
Jim Blandy committed
503 504
  s.main.c_line = 0;
  s.main.c_iflag &= ~ASCEDIT;
Jim Blandy's avatar
Jim Blandy committed
505 506 507
#endif
  /* Also, PTY overloads NUL and BREAK.
     don't ignore break, but don't signal either, so it looks like NUL.  */
Jim Blandy's avatar
Jim Blandy committed
508 509 510 511
  s.main.c_iflag &= ~IGNBRK;
  s.main.c_iflag &= ~BRKINT;
  /* QUIT and INTR work better as signals, so disable character forms */
  s.main.c_cc[VINTR] = 0377;
512 513 514 515 516 517 518 519 520 521 522
#ifdef SIGNALS_VIA_CHARACTERS
  /* the QUIT and INTR character are used in process_send_signal
     so set them here to something useful.  */
  if (s.main.c_cc[VQUIT] == 0377)
    s.main.c_cc[VQUIT] = '\\'&037;	/* Control-\ */
  if (s.main.c_cc[VINTR] == 0377)
    s.main.c_cc[VINTR] = 'C'&037;	/* Control-C */
#else /* no TIOCGPGRP or no TIOCGLTC or no TIOCGETC */
  /* QUIT and INTR work better as signals, so disable character forms */
  s.main.c_cc[VQUIT] = 0377;
  s.main.c_cc[VINTR] = 0377;
Jim Blandy's avatar
Jim Blandy committed
523
  s.main.c_lflag &= ~ISIG;
524 525
#endif /* no TIOCGPGRP or no TIOCGLTC or no TIOCGETC */
  s.main.c_cc[VEOL] = 0377;
Jim Blandy's avatar
Jim Blandy committed
526
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
527 528 529
#endif /* AIX */

#else /* not HAVE_TERMIO */
Jim Blandy's avatar
Jim Blandy committed
530 531 532

  s.main.sg_flags &= ~(ECHO | CRMOD | ANYP | ALLDELAY | RAW | LCASE
		       | CBREAK | TANDEM);
533
  s.main.sg_flags |= LPASS8;
Jim Blandy's avatar
Jim Blandy committed
534 535
  s.main.sg_erase = 0377;
  s.main.sg_kill = 0377;
536
  s.lmode = LLITOUT | s.lmode;        /* Don't strip 8th bit */
Jim Blandy's avatar
Jim Blandy committed
537

Jim Blandy's avatar
Jim Blandy committed
538 539
#endif /* not HAVE_TERMIO */

Jim Blandy's avatar
Jim Blandy committed
540
  EMACS_SET_TTY (out, &s, 0);
Jim Blandy's avatar
Jim Blandy committed
541 542 543 544 545 546 547 548 549 550 551

#ifdef BSD4_1
  if (interrupt_input)
    reset_sigio ();
#endif /* BSD4_1 */
#ifdef RTU
  {
    int zero = 0;
    ioctl (out, FIOASYNC, &zero);
  }
#endif /* RTU */
552
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
553 554 555 556 557 558 559 560 561
}
#endif /* not VMS */

#endif /* subprocesses */

/*ARGSUSED*/
setpgrp_of_tty (pid)
     int pid;
{
Jim Blandy's avatar
Jim Blandy committed
562
  EMACS_SET_TTY_PGRP (input_fd, &pid);
Jim Blandy's avatar
Jim Blandy committed
563
}
564

Jim Blandy's avatar
Jim Blandy committed
565 566 567 568 569 570 571 572 573 574 575 576
/* Record a signal code and the handler for it.  */
struct save_signal
{
  int code;
  SIGTYPE (*handler) ();
};

/* Suspend the Emacs process; give terminal to its superior.  */

sys_suspend ()
{
#ifdef VMS
577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594
  /* "Foster" parentage allows emacs to return to a subprocess that attached
     to the current emacs as a cheaper than starting a whole new process.  This
     is set up by KEPTEDITOR.COM.  */
  unsigned long parent_id, foster_parent_id;
  char *fpid_string;

  fpid_string = getenv ("EMACS_PARENT_PID");
  if (fpid_string != NULL)
    {
      sscanf (fpid_string, "%x", &foster_parent_id);
      if (foster_parent_id != 0)
	parent_id = foster_parent_id;
      else
	parent_id = getppid ();
    }
  else
    parent_id = getppid ();

595
  xfree (fpid_string);		/* On VMS, this was malloc'd */
Jim Blandy's avatar
Jim Blandy committed
596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611

  if (parent_id && parent_id != 0xffffffff)
    {
      SIGTYPE (*oldsig)() = (int) signal (SIGINT, SIG_IGN);
      int status = LIB$ATTACH (&parent_id) & 1;
      signal (SIGINT, oldsig);
      return status;
    }
  else
    {
      struct {
	int	l;
	char	*a;
      } d_prompt;
      d_prompt.l = sizeof ("Emacs: ");		/* Our special prompt */
      d_prompt.a = "Emacs: ";			/* Just a reminder */
612
      LIB$SPAWN (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, &d_prompt, 0);
Jim Blandy's avatar
Jim Blandy committed
613 614 615 616
      return 1;
    }
  return -1;
#else
617
#if defined(SIGTSTP) && !defined(MSDOS)
Jim Blandy's avatar
Jim Blandy committed
618

619
  {
620
    int pgrp = EMACS_GETPGRP (0);
621 622
    EMACS_KILLPG (pgrp, SIGTSTP);
  }
Jim Blandy's avatar
Jim Blandy committed
623 624 625 626 627 628 629 630 631 632 633

#else /* No SIGTSTP */
#ifdef USG_JOBCTRL /* If you don't know what this is don't mess with it */
  ptrace (0, 0, 0, 0);		/* set for ptrace - caught by csh */
  kill (getpid (), SIGQUIT);

#else /* No SIGTSTP or USG_JOBCTRL */

/* On a system where suspending is not implemented,
   instead fork a subshell and let it talk directly to the terminal
   while we wait.  */
634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649
  sys_subshell ();

#endif /* no USG_JOBCTRL */
#endif /* no SIGTSTP */
#endif /* not VMS */
}

/* Fork a subshell.  */

sys_subshell ()
{
#ifndef VMS
#ifdef MSDOS	/* Demacs 1.1.2 91/10/20 Manabu Higashida */
  int st;
  char oldwd[MAXPATHLEN+1]; /* Fixed length is safe on MSDOS.  */
#endif
650
  int pid;
Jim Blandy's avatar
Jim Blandy committed
651
  struct save_signal saved_handlers[5];
652 653 654
  Lisp_Object dir;
  unsigned char *str = 0;
  int len;
Jim Blandy's avatar
Jim Blandy committed
655 656 657 658 659 660 661 662 663 664 665

  saved_handlers[0].code = SIGINT;
  saved_handlers[1].code = SIGQUIT;
  saved_handlers[2].code = SIGTERM;
#ifdef SIGIO
  saved_handlers[3].code = SIGIO;
  saved_handlers[4].code = 0;
#else
  saved_handlers[3].code = 0;
#endif

666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686
  /* Mentioning current_buffer->buffer would mean including buffer.h,
     which somehow wedges the hp compiler.  So instead...  */

  dir = intern ("default-directory");
  /* Can't use NILP */
  if (XFASTINT (Fboundp (dir)) == XFASTINT (Qnil))
    goto xyzzy;
  dir = Fsymbol_value (dir);
  if (XTYPE (dir) != Lisp_String)
    goto xyzzy;

  dir = expand_and_dir_to_file (Funhandled_file_name_directory (dir), Qnil);
  str = (unsigned char *) alloca (XSTRING (dir)->size + 2);
  len = XSTRING (dir)->size;
  bcopy (XSTRING (dir)->data, str, len);
  if (str[len - 1] != '/') str[len++] = '/';
  str[len] = 0;
 xyzzy:

  pid = vfork ();

Jim Blandy's avatar
Jim Blandy committed
687 688 689 690 691 692
  if (pid == -1)
    error ("Can't spawn subshell");
  if (pid == 0)
    {
      char *sh;

693 694 695
#ifdef MSDOS	/* MW, Aug 1993 */
      getwd (oldwd);
#endif
Jim Blandy's avatar
Jim Blandy committed
696 697 698
      sh = (char *) egetenv ("SHELL");
      if (sh == 0)
	sh = "sh";
699

Jim Blandy's avatar
Jim Blandy committed
700
      /* Use our buffer's default directory for the subshell.  */
701
      if (str)
Jim Blandy's avatar
Jim Blandy committed
702
	chdir (str);
703

Jim Blandy's avatar
Jim Blandy committed
704 705 706
#ifdef subprocesses
      close_process_descs ();	/* Close Emacs's pipes/ptys */
#endif
707

708
#ifdef SET_EMACS_PRIORITY
709 710 711
      {
	extern int emacs_priority;

712
	if (emacs_priority < 0)
713 714 715 716
	  nice (-emacs_priority);
      }
#endif

717 718 719 720 721 722
#ifdef MSDOS	/* Demacs 1.1.2 91/10/20 Manabu Higashida */
      st = system (sh);
      chdir (oldwd);
      if (st)
        report_file_error ("Can't execute subshell", Fcons (build_string (sh), Qnil));
#else /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
723 724 725
      execlp (sh, sh, 0);
      write (1, "Can't execute subshell", 22);
      _exit (1);
726
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
727 728 729
    }

  save_signal_handlers (saved_handlers);
730
  synch_process_alive = 1;
Jim Blandy's avatar
Jim Blandy committed
731 732
  wait_for_termination (pid);
  restore_signal_handlers (saved_handlers);
733
#endif /* !VMS */
Jim Blandy's avatar
Jim Blandy committed
734 735 736 737 738 739 740
}

save_signal_handlers (saved_handlers)
     struct save_signal *saved_handlers;
{
  while (saved_handlers->code)
    {
Joseph Arceneaux's avatar
Joseph Arceneaux committed
741 742
      saved_handlers->handler
	= (SIGTYPE (*) ()) signal (saved_handlers->code, SIG_IGN);
Jim Blandy's avatar
Jim Blandy committed
743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763
      saved_handlers++;
    }
}

restore_signal_handlers (saved_handlers)
     struct save_signal *saved_handlers;
{
  while (saved_handlers->code)
    {
      signal (saved_handlers->code, saved_handlers->handler);
      saved_handlers++;
    }
}

#ifdef F_SETFL

int old_fcntl_flags;

init_sigio ()
{
#ifdef FASYNC
764
  old_fcntl_flags = fcntl (input_fd, F_GETFL, 0) & ~FASYNC;
Jim Blandy's avatar
Jim Blandy committed
765 766 767 768 769 770 771 772 773
#endif
  request_sigio ();
}

reset_sigio ()
{
  unrequest_sigio ();
}

774
#ifdef FASYNC		/* F_SETFL does not imply existence of FASYNC */
Jim Blandy's avatar
Jim Blandy committed
775 776 777 778

request_sigio ()
{
#ifdef SIGWINCH
Jim Blandy's avatar
Jim Blandy committed
779
  sigunblock (sigmask (SIGWINCH));
Jim Blandy's avatar
Jim Blandy committed
780
#endif
781
  fcntl (input_fd, F_SETFL, old_fcntl_flags | FASYNC);
Jim Blandy's avatar
Jim Blandy committed
782 783 784 785 786 787 788

  interrupts_deferred = 0;
}

unrequest_sigio ()
{
#ifdef SIGWINCH
Jim Blandy's avatar
Jim Blandy committed
789
  sigblock (sigmask (SIGWINCH));
Jim Blandy's avatar
Jim Blandy committed
790
#endif
791
  fcntl (input_fd, F_SETFL, old_fcntl_flags);
Jim Blandy's avatar
Jim Blandy committed
792 793 794 795 796 797 798 799 800
  interrupts_deferred = 1;
}

#else /* no FASYNC */
#ifdef STRIDE		/* Stride doesn't have FASYNC - use FIOASYNC */

request_sigio ()
{
  int on = 1;
801
  ioctl (input_fd, FIOASYNC, &on);
Jim Blandy's avatar
Jim Blandy committed
802 803 804 805 806 807 808
  interrupts_deferred = 0;
}

unrequest_sigio ()
{
  int off = 0;

809
  ioctl (input_fd, FIOASYNC, &off);
Jim Blandy's avatar
Jim Blandy committed
810 811 812 813 814
  interrupts_deferred = 1;
}

#else /* not FASYNC, not STRIDE */
 
815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840
#ifdef _CX_UX

#include <termios.h>

request_sigio ()
{
  int on = 1;
  sigset_t st;

  sigemptyset(&st);
  sigaddset(&st, SIGIO);
  ioctl (input_fd, FIOASYNC, &on);
  interrupts_deferred = 0;
  sigprocmask(SIG_UNBLOCK, &st, (sigset_t *)0);
}

unrequest_sigio ()
{
  int off = 0;

  ioctl (input_fd, FIOASYNC, &off);
  interrupts_deferred = 1;
}

#else /* ! _CX_UX */

Jim Blandy's avatar
Jim Blandy committed
841 842 843 844 845 846 847 848 849 850
request_sigio ()
{
  croak ("request_sigio");
}
 
unrequest_sigio ()
{
  croak ("unrequest_sigio");
}
 
851
#endif /* _CX_UX */
Jim Blandy's avatar
Jim Blandy committed
852 853 854
#endif /* STRIDE */
#endif /* FASYNC */
#endif /* F_SETFL */
855

856 857
/* Saving and restoring the process group of Emacs's terminal.  */

858
#ifdef BSD_PGRPS
859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889

/* The process group of which Emacs was a member when it initially
   started.

   If Emacs was in its own process group (i.e. inherited_pgroup ==
   getpid ()), then we know we're running under a shell with job
   control (Emacs would never be run as part of a pipeline).
   Everything is fine.

   If Emacs was not in its own process group, then we know we're
   running under a shell (or a caller) that doesn't know how to
   separate itself from Emacs (like sh).  Emacs must be in its own
   process group in order to receive SIGIO correctly.  In this
   situation, we put ourselves in our own pgroup, forcibly set the
   tty's pgroup to our pgroup, and make sure to restore and reinstate
   the tty's pgroup just like any other terminal setting.  If
   inherited_group was not the tty's pgroup, then we'll get a
   SIGTTmumble when we try to change the tty's pgroup, and a CONT if
   it goes foreground in the future, which is what should happen.  */
int inherited_pgroup;

/* Split off the foreground process group to Emacs alone.
   When we are in the foreground, but not started in our own process
   group, redirect the TTY to point to our own process group.  We need
   to be in our own process group to receive SIGIO properly.  */
narrow_foreground_group ()
{
  int me = getpid ();

  setpgrp (0, inherited_pgroup);
  if (inherited_pgroup != me)
890
    EMACS_SET_TTY_PGRP (input_fd, &me);
891 892 893 894 895 896 897
  setpgrp (0, me);
}

/* Set the tty to our original foreground group.  */
widen_foreground_group ()
{
  if (inherited_pgroup != getpid ())
898
    EMACS_SET_TTY_PGRP (input_fd, &inherited_pgroup);
899 900 901
  setpgrp (0, inherited_pgroup);
}

902
#endif /* BSD_PGRPS */
903

904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934
/* Getting and setting emacs_tty structures.  */

/* Set *TC to the parameters associated with the terminal FD.
   Return zero if all's well, or -1 if we ran into an error we
   couldn't deal with.  */
int
emacs_get_tty (fd, settings)
     int fd;
     struct emacs_tty *settings;
{
  /* Retrieve the primary parameters - baud rate, character size, etcetera.  */
#ifdef HAVE_TCATTR
  /* We have those nifty POSIX tcmumbleattr functions.  */
  if (tcgetattr (fd, &settings->main) < 0)
    return -1;

#else
#ifdef HAVE_TERMIO
  /* The SYSV-style interface?  */
  if (ioctl (fd, TCGETA, &settings->main) < 0)
    return -1;

#else
#ifdef VMS
  /* Vehemently Monstrous System?  :-)  */
  if (! (SYS$QIOW (0, fd, IO$_SENSEMODE, settings, 0, 0,
		   &settings->main.class, 12, 0, 0, 0, 0)
	 & 1))
    return -1;

#else
935
#ifndef MSDOS
936 937 938
  /* I give up - I hope you have the BSD ioctls.  */
  if (ioctl (fd, TIOCGETP, &settings->main) < 0)
    return -1;
939
#endif /* not MSDOS */
940 941 942 943 944
#endif
#endif
#endif

  /* Suivant - Do we have to get struct ltchars data?  */
945
#ifdef HAVE_LTCHARS
946 947 948 949 950
  if (ioctl (fd, TIOCGLTC, &settings->ltchars) < 0)
    return -1;
#endif

  /* How about a struct tchars and a wordful of lmode bits?  */
951
#ifdef HAVE_TCHARS
952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974
  if (ioctl (fd, TIOCGETC, &settings->tchars) < 0
      || ioctl (fd, TIOCLGET, &settings->lmode) < 0)
    return -1;
#endif

  /* We have survived the tempest.  */
  return 0;
}


/* Set the parameters of the tty on FD according to the contents of
   *SETTINGS.  If WAITP is non-zero, we wait for all queued output to
   be written before making the change; otherwise, we forget any
   queued input and make the change immediately.
   Return 0 if all went well, and -1 if anything failed.  */
int
emacs_set_tty (fd, settings, waitp)
     int fd;
     struct emacs_tty *settings;
     int waitp;
{
  /* Set the primary parameters - baud rate, character size, etcetera.  */
#ifdef HAVE_TCATTR
975
  int i;
976 977 978 979 980 981 982
  /* We have those nifty POSIX tcmumbleattr functions.
     William J. Smith <wjs@wiis.wang.com> writes:
     "POSIX 1003.1 defines tcsetattr() to return success if it was
     able to perform any of the requested actions, even if some
     of the requested actions could not be performed.
     We must read settings back to ensure tty setup properly.
     AIX requires this to keep tty from hanging occasionally."  */
983
  /* This make sure that we don't loop indefinitely in here.  */
984
  for (i = 0 ; i < 10 ; i++)
985 986 987 988 989 990 991 992 993 994 995 996 997
    if (tcsetattr (fd, waitp ? TCSAFLUSH : TCSADRAIN, &settings->main) < 0)
      {
	if (errno == EINTR)
	  continue;
	else
	  return -1;
      }
    else
      {
	struct termios new;

	/* Get the current settings, and see if they're what we asked for.  */
	tcgetattr (fd, &new);
998 999 1000 1001 1002 1003 1004 1005 1006
	/* We cannot use memcmp on the whole structure here because under
	 * aix386 the termios structure has some reserved field that may
	 * not be filled in.
	 */
	if (   new.c_iflag == settings->main.c_iflag
	    && new.c_oflag == settings->main.c_oflag
	    && new.c_cflag == settings->main.c_cflag
	    && new.c_lflag == settings->main.c_lflag
	    && memcmp(new.c_cc, settings->main.c_cc, NCCS) == 0)
1007
	  break;
1008 1009
	else
	  continue;
1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026
      }

#else
#ifdef HAVE_TERMIO
  /* The SYSV-style interface?  */
  if (ioctl (fd, waitp ? TCSETAW : TCSETAF, &settings->main) < 0)
    return -1;

#else
#ifdef VMS
  /* Vehemently Monstrous System?  :-)  */
  if (! (SYS$QIOW (0, fd, IO$_SETMODE, &input_iosb, 0, 0,
		   &settings->main.class, 12, 0, 0, 0, 0)
	 & 1))
    return -1;

#else
1027
#ifndef MSDOS
1028 1029 1030
  /* I give up - I hope you have the BSD ioctls.  */
  if (ioctl (fd, (waitp) ? TIOCSETP : TIOCSETN, &settings->main) < 0)
    return -1;
1031
#endif /* not MSDOS */
1032 1033 1034 1035 1036 1037

#endif
#endif
#endif

  /* Suivant - Do we have to get struct ltchars data?  */
1038
#ifdef HAVE_LTCHARS
1039 1040 1041 1042 1043
  if (ioctl (fd, TIOCSLTC, &settings->ltchars) < 0)
    return -1;
#endif

  /* How about a struct tchars and a wordful of lmode bits?  */
1044
#ifdef HAVE_TCHARS
1045 1046 1047 1048 1049 1050 1051 1052 1053
  if (ioctl (fd, TIOCSETC, &settings->tchars) < 0
      || ioctl (fd, TIOCLSET, &settings->lmode) < 0)
    return -1;
#endif
  
  /* We have survived the tempest.  */
  return 0;
}

Jim Blandy's avatar
Jim Blandy committed
1054

Jim Blandy's avatar
Jim Blandy committed
1055 1056
/* The initial tty mode bits */
struct emacs_tty old_tty;
Jim Blandy's avatar
Jim Blandy committed
1057 1058 1059

int term_initted;		/* 1 if outer tty status has been recorded */

Jim Blandy's avatar
Jim Blandy committed
1060 1061 1062 1063 1064 1065
#ifdef BSD4_1
/* BSD 4.1 needs to keep track of the lmode bits in order to start
   sigio.  */
int lmode;
#endif

1066
#ifndef F_SETOWN_BUG
Jim Blandy's avatar
Jim Blandy committed
1067 1068 1069
#ifdef F_SETOWN
int old_fcntl_owner;
#endif /* F_SETOWN */
1070
#endif /* F_SETOWN_BUG */
Jim Blandy's avatar
Jim Blandy committed
1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081

/* This may also be defined in stdio,
   but if so, this does no harm,
   and using the same name avoids wasting the other one's space.  */

#if defined (USG) || defined (DGUX)
unsigned char _sobuf[BUFSIZ+8];
#else
char _sobuf[BUFSIZ];
#endif
 
1082
#ifdef HAVE_LTCHARS
Jim Blandy's avatar
Jim Blandy committed
1083 1084
static struct ltchars new_ltchars = {-1,-1,-1,-1,-1,-1};
#endif
1085
#ifdef HAVE_TCHARS
Jim Blandy's avatar
Jim Blandy committed
1086 1087 1088 1089 1090
  static struct tchars new_tchars = {-1,-1,-1,-1,-1,-1};
#endif 

init_sys_modes ()
{
Jim Blandy's avatar
Jim Blandy committed
1091 1092
  struct emacs_tty tty;

Jim Blandy's avatar
Jim Blandy committed
1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
#ifdef VMS
#if 0
  static int oob_chars[2] = {0, 1 << 7}; /* catch C-g's */
  extern int (*interrupt_signal) ();
#endif
#endif

  if (noninteractive)
    return;

#ifdef VMS
  if (!input_ef)
    input_ef = get_kbd_event_flag ();
    /* LIB$GET_EF (&input_ef); */
  SYS$CLREF (input_ef);
  waiting_for_ast = 0;
  if (!timer_ef)
    timer_ef = get_timer_event_flag ();
    /* LIB$GET_EF (&timer_ef); */
  SYS$CLREF (timer_ef);
1113
#if 0
Jim Blandy's avatar
Jim Blandy committed
1114 1115 1116 1117 1118 1119 1120
  if (!process_ef)
    {
      LIB$GET_EF (&process_ef);
      SYS$CLREF (process_ef);
    }
  if (input_ef / 32 != process_ef / 32)
    croak ("Input and process event flags in different clusters.");
1121
#endif
Jim Blandy's avatar
Jim Blandy committed
1122
  if (input_ef / 32 != timer_ef / 32)
1123 1124
    croak ("Input and timer event flags in different clusters.");
#if 0
Jim Blandy's avatar
Jim Blandy committed
1125 1126
  input_eflist = ((unsigned) 1 << (input_ef % 32)) |
    ((unsigned) 1 << (process_ef % 32));
1127
#endif
Jim Blandy's avatar
Jim Blandy committed
1128 1129 1130 1131 1132 1133
  timer_eflist = ((unsigned) 1 << (input_ef % 32)) |
    ((unsigned) 1 << (timer_ef % 32));
#ifndef VMS4_4
  sys_access_reinit ();
#endif
#endif /* not VMS */
Jim Blandy's avatar
Jim Blandy committed
1134

1135
#ifdef BSD_PGRPS
1136 1137 1138 1139
  if (! read_socket_hook && EQ (Vwindow_system, Qnil))
    narrow_foreground_group ();
#endif

Jim Blandy's avatar
Jim Blandy committed
1140 1141
  EMACS_GET_TTY (input_fd, &old_tty);

Jim Blandy's avatar
Jim Blandy committed
1142 1143
  if (!read_socket_hook && EQ (Vwindow_system, Qnil))
    {
Jim Blandy's avatar
Jim Blandy committed
1144
      tty = old_tty;
Jim Blandy's avatar
Jim Blandy committed
1145

1146
#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
1147 1148 1149 1150
#ifdef DGUX
      /* This allows meta to be sent on 8th bit.  */
      tty.main.c_iflag &= ~INPCK;	/* don't check input for parity */
#endif
Jim Blandy's avatar
Jim Blandy committed
1151 1152
      tty.main.c_iflag |= (IGNBRK);	/* Ignore break condition */
      tty.main.c_iflag &= ~ICRNL;	/* Disable map of CR to NL on input */
Jim Blandy's avatar
Jim Blandy committed
1153
#ifdef ISTRIP
Jim Blandy's avatar
Jim Blandy committed
1154
      tty.main.c_iflag &= ~ISTRIP;	/* don't strip 8th bit on input */
Jim Blandy's avatar
Jim Blandy committed
1155
#endif
Jim Blandy's avatar
Jim Blandy committed
1156 1157
      tty.main.c_lflag &= ~ECHO;	/* Disable echo */
      tty.main.c_lflag &= ~ICANON;	/* Disable erase/kill processing */
1158
#ifdef IEXTEN
1159
      tty.main.c_lflag &= ~IEXTEN;	/* Disable other editing characters.  */
1160
#endif
Jim Blandy's avatar
Jim Blandy committed
1161
      tty.main.c_lflag |= ISIG;	/* Enable signals */
Jim Blandy's avatar
Jim Blandy committed
1162 1163
      if (flow_control)
	{
Jim Blandy's avatar
Jim Blandy committed
1164
	  tty.main.c_iflag |= IXON;	/* Enable start/stop output control */
Jim Blandy's avatar
Jim Blandy committed
1165
#ifdef IXANY
Jim Blandy's avatar
Jim Blandy committed
1166
	  tty.main.c_iflag &= ~IXANY;
Jim Blandy's avatar
Jim Blandy committed
1167 1168 1169
#endif /* IXANY */
	}
      else
Jim Blandy's avatar
Jim Blandy committed
1170 1171 1172 1173
	tty.main.c_iflag &= ~IXON;	/* Disable start/stop output control */
      tty.main.c_oflag &= ~ONLCR;	/* Disable map of NL to CR-NL 
					   on output */
      tty.main.c_oflag &= ~TAB3;	/* Disable tab expansion */
Jim Blandy's avatar
Jim Blandy committed
1174 1175 1176
#ifdef CS8
      if (meta_key)
	{
Jim Blandy's avatar
Jim Blandy committed
1177 1178
	  tty.main.c_cflag |= CS8;	/* allow 8th bit on input */
	  tty.main.c_cflag &= ~PARENB;/* Don't check parity */
Jim Blandy's avatar
Jim Blandy committed
1179 1180
	}
#endif
Jim Blandy's avatar
Jim Blandy committed
1181
      tty.main.c_cc[VINTR] = quit_char;	/* C-g (usually) gives SIGINT */
Jim Blandy's avatar
Jim Blandy committed
1182 1183 1184
      /* Set up C-g for both SIGQUIT and SIGINT.
	 We don't know which we will get, but we handle both alike
	 so which one it really gives us does not matter.  */
Jim Blandy's avatar
Jim Blandy committed
1185 1186 1187
      tty.main.c_cc[VQUIT] = quit_char;
      tty.main.c_cc[VMIN] = 1;	/* Input should wait for at least 1 char */
      tty.main.c_cc[VTIME] = 0;	/* no matter how long that takes.  */
Jim Blandy's avatar
Jim Blandy committed
1188
#ifdef VSWTCH
1189
      tty.main.c_cc[VSWTCH] = CDISABLE;	/* Turn off shell layering use
Jim Blandy's avatar
Jim Blandy committed
1190
					   of C-z */
Jim Blandy's avatar
Jim Blandy committed
1191 1192 1193
#endif /* VSWTCH */
#if defined (mips) || defined (HAVE_TCATTR)
#ifdef VSUSP
1194
      tty.main.c_cc[VSUSP] = CDISABLE;	/* Turn off mips handling of C-z.  */
Jim Blandy's avatar
Jim Blandy committed
1195 1196
#endif /* VSUSP */
#ifdef V_DSUSP
1197
      tty.main.c_cc[V_DSUSP] = CDISABLE; /* Turn off mips handling of C-y.  */
Jim Blandy's avatar
Jim Blandy committed
1198
#endif /* V_DSUSP */
1199 1200 1201
#ifdef VDSUSP /* Some systems have VDSUSP, some have V_DSUSP.  */
      tty.main.c_cc[VDSUSP] = CDISABLE;
#endif /* VDSUSP */
1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213
#ifdef VLNEXT
      tty.main.c_cc[VLNEXT] = CDISABLE;
#endif /* VLNEXT */
#ifdef VREPRINT
      tty.main.c_cc[VREPRINT] = CDISABLE;
#endif /* VREPRINT */
#ifdef VWERASE
      tty.main.c_cc[VWERASE] = CDISABLE;
#endif /* VWERASE */
#ifdef VDISCARD
      tty.main.c_cc[VDISCARD] = CDISABLE;
#endif /* VDISCARD */
1214 1215 1216 1217 1218 1219
#ifdef VSTART
      tty.main.c_cc[VSTART] = CDISABLE;
#endif /* VSTART */
#ifdef VSTOP
      tty.main.c_cc[VSTOP] = CDISABLE;
#endif /* VSTOP */
Jim Blandy's avatar
Jim Blandy committed
1220 1221 1222 1223
#endif /* mips or HAVE_TCATTR */
#ifdef AIX
#ifndef IBMR2AIX
      /* AIX enhanced edit loses NULs, so disable it */
Jim Blandy's avatar
Jim Blandy committed
1224 1225
      tty.main.c_line = 0;
      tty.main.c_iflag &= ~ASCEDIT;
Jim Blandy's avatar
Jim Blandy committed
1226
#else
Jim Blandy's avatar
Jim Blandy committed
1227 1228 1229 1230