sysdep.c 114 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

Jim Blandy's avatar
Jim Blandy committed
62 63 64 65 66
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>

67 68 69 70 71 72 73
#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
74 75
extern int errno;

76 77 78 79 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
#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
110

111 112 113 114 115 116 117 118
#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
119

120
#ifndef MSDOS
Jim Blandy's avatar
Jim Blandy committed
121
#include <sys/ioctl.h>
122
#endif
123
#include "systty.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
124
#include "syswait.h"
Jim Blandy's avatar
Jim Blandy committed
125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148

#ifdef BROKEN_TIOCGWINSZ
#undef TIOCGWINSZ
#endif

#ifdef USG
#include <sys/utsname.h>
#include <string.h>
#ifndef MEMORY_IN_STRING_H
#include <memory.h>
#endif
#ifdef TIOCGWINSZ
#ifdef NEED_SIOCTL
#include <sys/sioctl.h>
#endif
#ifdef NEED_PTEM_H
#include <sys/stream.h>
#include <sys/ptem.h>
#endif
#endif /* TIOCGWINSZ */
#endif /* USG */

extern int quit_char;

Jim Blandy's avatar
Jim Blandy committed
149
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
150 151 152 153 154 155 156 157 158 159 160
#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
161 162
#include "syssignal.h"
#include "systime.h"
Jim Blandy's avatar
Jim Blandy committed
163

164 165 166 167 168 169 170 171 172
/* 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
173 174 175 176 177 178 179 180 181 182 183 184
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
185
/* The file descriptor for Emacs's input terminal.
186
   Under Unix, this is normaly zero except when using X;
Jim Blandy's avatar
Jim Blandy committed
187 188 189
   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;
190 191 192 193 194 195 196 197 198 199 200

/* 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
201

Jim Blandy's avatar
Jim Blandy committed
202 203
discard_tty_input ()
{
Jim Blandy's avatar
Jim Blandy committed
204
  struct emacs_tty buf;
Jim Blandy's avatar
Jim Blandy committed
205 206 207 208 209 210 211 212 213 214 215

  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
216 217
  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
218 219 220 221 222
  queue_kbd_input ();
#else /* not VMS */
#ifdef APOLLO
  {
    int zero = 0;
223
    ioctl (input_fd, TIOCFLUSH, &zero);
Jim Blandy's avatar
Jim Blandy committed
224 225
  }
#else /* not Apollo */
226 227 228 229
#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
230 231
  EMACS_GET_TTY (input_fd, &buf);
  EMACS_SET_TTY (input_fd, &buf, 0);
232
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
233 234 235 236 237 238
#endif /* not Apollo */
#endif /* not VMS */
}

#ifdef SIGTSTP

239 240 241
/* Arrange for character C to be read as the next input from
   the terminal.  */

Jim Blandy's avatar
Jim Blandy committed
242 243 244 245 246
stuff_char (c)
     char c;
{
/* Should perhaps error if in batch mode */
#ifdef TIOCSTI
247
  ioctl (input_fd, TIOCSTI, &c);
Jim Blandy's avatar
Jim Blandy committed
248
#else /* no TIOCSTI */
249
  error ("Cannot stuff terminal input characters in this version of Unix");
Jim Blandy's avatar
Jim Blandy committed
250 251 252 253
#endif /* no TIOCSTI */
}

#endif /* SIGTSTP */
254

Jim Blandy's avatar
Jim Blandy committed
255 256 257 258 259 260
init_baud_rate ()
{
  if (noninteractive)
    ospeed = 0;
  else
    {
261 262 263
#ifdef MSDOS
    ospeed = 15;
#else
Jim Blandy's avatar
Jim Blandy committed
264
#ifdef VMS
Jim Blandy's avatar
Jim Blandy committed
265 266 267
      struct sensemode sg;

      SYS$QIOW (0, input_fd, IO$_SENSEMODE, &sg, 0, 0,
Jim Blandy's avatar
Jim Blandy committed
268
		&sg.class, 12, 0, 0, 0, 0 );
Jim Blandy's avatar
Jim Blandy committed
269 270
      ospeed = sg.xmit_baud;
#else /* not VMS */
271 272
#ifdef HAVE_TERMIOS
      struct termios sg;
Jim Blandy's avatar
Jim Blandy committed
273

274
      sg.c_cflag = B9600;
275
      tcgetattr (input_fd, &sg);
276
      ospeed = cfgetospeed (&sg);
277 278 279
#else /* neither VMS nor TERMIOS */
#ifdef HAVE_TERMIO
      struct termio sg;
Jim Blandy's avatar
Jim Blandy committed
280

281
      sg.c_cflag = B9600;
282
#ifdef HAVE_TCATTR
283
      tcgetattr (input_fd, &sg);
284
#else
285
      ioctl (input_fd, TCGETA, &sg);
286
#endif
Jim Blandy's avatar
Jim Blandy committed
287
      ospeed = sg.c_cflag & CBAUD;
288
#else /* neither VMS nor TERMIOS nor TERMIO */
Jim Blandy's avatar
Jim Blandy committed
289 290 291
      struct sgttyb sg;
      
      sg.sg_ospeed = B9600;
292
      if (ioctl (input_fd, TIOCGETP, &sg) < 0)
293
	abort ();
Jim Blandy's avatar
Jim Blandy committed
294 295
      ospeed = sg.sg_ospeed;
#endif /* not HAVE_TERMIO */
296
#endif /* not HAVE_TERMIOS */
Jim Blandy's avatar
Jim Blandy committed
297
#endif /* not VMS */
298
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315
    }
   
  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 */
}
316

Jim Blandy's avatar
Jim Blandy committed
317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349
#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;

350
      status = SYS$FORCEX (&pid, 0, 0);
Jim Blandy's avatar
Jim Blandy committed
351 352
      break;
#else /* not VMS */
353
#if defined (BSD) || (defined (HPUX) && !defined (HPUX_5))
354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371
      /* 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);
372 373
#else /* not BSD, and not HPUX version >= 6 */
#if defined (UNIPLUS)
374 375 376
      if (0 > kill (pid, 0))
	break;
      wait (0);
377
#else /* neither BSD nor UNIPLUS: random sysV */
378 379 380 381 382 383 384
#ifdef POSIX_SIGNALS	/* would this work for LINUX as well? */
      sigblock (sigmask (SIGCHLD));
      if (0 > kill (pid, 0))
	{
	  sigunblock (sigmask (SIGCHLD));
	  break;
	}
385
      sigpause (SIGEMPTYMASK);
386
#else /* not POSIX_SIGNALS */
387 388 389 390 391 392 393 394 395 396
#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
397
	break;
398 399 400 401 402
      /* 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 */
403
#endif /* not POSIX_SIGNALS */
404 405
#endif /* not UNIPLUS */
#endif /* not BSD, and not HPUX version >= 6 */
Jim Blandy's avatar
Jim Blandy committed
406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448
#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
}
449

Jim Blandy's avatar
Jim Blandy committed
450 451 452 453 454 455 456 457 458
#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;
{
459
#ifndef MSDOS
Jim Blandy's avatar
Jim Blandy committed
460 461 462
  struct emacs_tty s;

  EMACS_GET_TTY (out, &s);
Jim Blandy's avatar
Jim Blandy committed
463

464
#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
Jim Blandy's avatar
Jim Blandy committed
465 466
  s.main.c_oflag |= OPOST;	/* Enable output postprocessing */
  s.main.c_oflag &= ~ONLCR;	/* Disable map of NL to CR-NL on output */
467
#ifdef NLDLY
Jim Blandy's avatar
Jim Blandy committed
468 469
  s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
  				/* No output delays */
470
#endif
Jim Blandy's avatar
Jim Blandy committed
471 472
  s.main.c_lflag &= ~ECHO;	/* Disable echo */
  s.main.c_lflag |= ISIG;	/* Enable signals */
473 474 475
#ifdef IUCLC
  s.main.c_iflag &= ~IUCLC;	/* Disable downcasing on input.  */
#endif
476
#ifdef OLCUC
477 478
  s.main.c_oflag &= ~OLCUC;	/* Disable upcasing on output.  */
#endif
479
  s.main.c_cflag = (s.main.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
Jim Blandy's avatar
Jim Blandy committed
480
#if 0
481
  /* Said to be unnecessary:  */
Jim Blandy's avatar
Jim Blandy committed
482 483 484 485 486 487 488 489 490
  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
491
#ifdef HPUX
Jim Blandy's avatar
Jim Blandy committed
492
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
493
#endif /* HPUX */
Jim Blandy's avatar
Jim Blandy committed
494

Jim Blandy's avatar
Jim Blandy committed
495 496 497
#ifdef AIX
/* AIX enhanced edit loses NULs, so disable it */
#ifndef IBMR2AIX
Jim Blandy's avatar
Jim Blandy committed
498 499
  s.main.c_line = 0;
  s.main.c_iflag &= ~ASCEDIT;
Jim Blandy's avatar
Jim Blandy committed
500 501 502
#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
503 504 505 506
  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;
507 508 509 510 511 512 513 514 515 516 517
#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
518
  s.main.c_lflag &= ~ISIG;
519 520
#endif /* no TIOCGPGRP or no TIOCGLTC or no TIOCGETC */
  s.main.c_cc[VEOL] = 0377;
Jim Blandy's avatar
Jim Blandy committed
521
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
522 523 524
#endif /* AIX */

#else /* not HAVE_TERMIO */
Jim Blandy's avatar
Jim Blandy committed
525 526 527

  s.main.sg_flags &= ~(ECHO | CRMOD | ANYP | ALLDELAY | RAW | LCASE
		       | CBREAK | TANDEM);
528
  s.main.sg_flags |= LPASS8;
Jim Blandy's avatar
Jim Blandy committed
529 530
  s.main.sg_erase = 0377;
  s.main.sg_kill = 0377;
531
  s.lmode = LLITOUT | s.lmode;        /* Don't strip 8th bit */
Jim Blandy's avatar
Jim Blandy committed
532

Jim Blandy's avatar
Jim Blandy committed
533 534
#endif /* not HAVE_TERMIO */

Jim Blandy's avatar
Jim Blandy committed
535
  EMACS_SET_TTY (out, &s, 0);
Jim Blandy's avatar
Jim Blandy committed
536 537 538 539 540 541 542 543 544 545 546

#ifdef BSD4_1
  if (interrupt_input)
    reset_sigio ();
#endif /* BSD4_1 */
#ifdef RTU
  {
    int zero = 0;
    ioctl (out, FIOASYNC, &zero);
  }
#endif /* RTU */
547
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
548 549 550 551 552 553 554 555 556
}
#endif /* not VMS */

#endif /* subprocesses */

/*ARGSUSED*/
setpgrp_of_tty (pid)
     int pid;
{
Jim Blandy's avatar
Jim Blandy committed
557
  EMACS_SET_TTY_PGRP (input_fd, &pid);
Jim Blandy's avatar
Jim Blandy committed
558
}
559

Jim Blandy's avatar
Jim Blandy committed
560 561 562 563 564 565 566 567 568 569 570 571
/* 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
572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589
  /* "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 ();

590
  xfree (fpid_string);		/* On VMS, this was malloc'd */
Jim Blandy's avatar
Jim Blandy committed
591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606

  if (parent_id && parent_id != 0xffffffff)
    {
      SIGTYPE (*oldsig)() = (int) signal (SIGINT, SIG_IGN);
      int status = LIB$ATTACH (&parent_id) & 1;
      signal (SIGINT, oldsig);
      return status;
    }
  else
    {
      struct {
	int	l;
	char	*a;
      } d_prompt;
      d_prompt.l = sizeof ("Emacs: ");		/* Our special prompt */
      d_prompt.a = "Emacs: ";			/* Just a reminder */
607
      LIB$SPAWN (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, &d_prompt, 0);
Jim Blandy's avatar
Jim Blandy committed
608 609 610 611
      return 1;
    }
  return -1;
#else
612
#if defined(SIGTSTP) && !defined(MSDOS)
Jim Blandy's avatar
Jim Blandy committed
613

614
  {
615
    int pgrp = EMACS_GETPGRP (0);
616 617
    EMACS_KILLPG (pgrp, SIGTSTP);
  }
Jim Blandy's avatar
Jim Blandy committed
618 619 620 621 622 623 624 625 626 627 628

#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.  */
629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644
  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
Jim Blandy's avatar
Jim Blandy committed
645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663
  int pid = fork ();
  struct save_signal saved_handlers[5];

  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

  if (pid == -1)
    error ("Can't spawn subshell");
  if (pid == 0)
    {
      char *sh;

664 665 666
#ifdef MSDOS	/* MW, Aug 1993 */
      getwd (oldwd);
#endif
Jim Blandy's avatar
Jim Blandy committed
667 668 669
      sh = (char *) egetenv ("SHELL");
      if (sh == 0)
	sh = "sh";
670

Jim Blandy's avatar
Jim Blandy committed
671 672 673 674 675 676 677 678 679 680
      /* Use our buffer's default directory for the subshell.  */
      {
	Lisp_Object dir;
	unsigned char *str;
	int len;

	/* mentioning current_buffer->buffer would mean including buffer.h,
	   which somehow wedges the hp compiler.  So instead... */

	dir = intern ("default-directory");
681
	/* Can't use NILP */
Jim Blandy's avatar
Jim Blandy committed
682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698
	if (XFASTINT (Fboundp (dir)) == XFASTINT (Qnil))
	  goto xyzzy;
	dir = Fsymbol_value (dir);
	if (XTYPE (dir) != Lisp_String)
	  goto xyzzy;

	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;
	chdir (str);
      }
    xyzzy:
#ifdef subprocesses
      close_process_descs ();	/* Close Emacs's pipes/ptys */
#endif
699 700 701 702 703 704 705 706 707 708

#ifdef PRIO_PROCESS
      {
	extern int emacs_priority;

	if (emacs_priority)
	  nice (-emacs_priority);
      }
#endif

709 710 711 712 713 714
#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
715 716 717
      execlp (sh, sh, 0);
      write (1, "Can't execute subshell", 22);
      _exit (1);
718
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
719 720 721
    }

  save_signal_handlers (saved_handlers);
722
  synch_process_alive = 1;
Jim Blandy's avatar
Jim Blandy committed
723 724
  wait_for_termination (pid);
  restore_signal_handlers (saved_handlers);
725
#endif /* !VMS */
Jim Blandy's avatar
Jim Blandy committed
726 727 728 729 730 731 732
}

save_signal_handlers (saved_handlers)
     struct save_signal *saved_handlers;
{
  while (saved_handlers->code)
    {
Joseph Arceneaux's avatar
Joseph Arceneaux committed
733 734
      saved_handlers->handler
	= (SIGTYPE (*) ()) signal (saved_handlers->code, SIG_IGN);
Jim Blandy's avatar
Jim Blandy committed
735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755
      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
756
  old_fcntl_flags = fcntl (input_fd, F_GETFL, 0) & ~FASYNC;
Jim Blandy's avatar
Jim Blandy committed
757 758 759 760 761 762 763 764 765
#endif
  request_sigio ();
}

reset_sigio ()
{
  unrequest_sigio ();
}

766
#ifdef FASYNC		/* F_SETFL does not imply existence of FASYNC */
Jim Blandy's avatar
Jim Blandy committed
767 768 769 770

request_sigio ()
{
#ifdef SIGWINCH
Jim Blandy's avatar
Jim Blandy committed
771
  sigunblock (sigmask (SIGWINCH));
Jim Blandy's avatar
Jim Blandy committed
772
#endif
773
  fcntl (input_fd, F_SETFL, old_fcntl_flags | FASYNC);
Jim Blandy's avatar
Jim Blandy committed
774 775 776 777 778 779 780

  interrupts_deferred = 0;
}

unrequest_sigio ()
{
#ifdef SIGWINCH
Jim Blandy's avatar
Jim Blandy committed
781
  sigblock (sigmask (SIGWINCH));
Jim Blandy's avatar
Jim Blandy committed
782
#endif
783
  fcntl (input_fd, F_SETFL, old_fcntl_flags);
Jim Blandy's avatar
Jim Blandy committed
784 785 786 787 788 789 790 791 792
  interrupts_deferred = 1;
}

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

request_sigio ()
{
  int on = 1;
793
  ioctl (input_fd, FIOASYNC, &on);
Jim Blandy's avatar
Jim Blandy committed
794 795 796 797 798 799 800
  interrupts_deferred = 0;
}

unrequest_sigio ()
{
  int off = 0;

801
  ioctl (input_fd, FIOASYNC, &off);
Jim Blandy's avatar
Jim Blandy committed
802 803 804 805 806
  interrupts_deferred = 1;
}

#else /* not FASYNC, not STRIDE */
 
807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832
#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
833 834 835 836 837 838 839 840 841 842
request_sigio ()
{
  croak ("request_sigio");
}
 
unrequest_sigio ()
{
  croak ("unrequest_sigio");
}
 
843
#endif /* _CX_UX */
Jim Blandy's avatar
Jim Blandy committed
844 845 846
#endif /* STRIDE */
#endif /* FASYNC */
#endif /* F_SETFL */
847

848 849
/* Saving and restoring the process group of Emacs's terminal.  */

850
#ifdef BSD_PGRPS
851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881

/* 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)
882
    EMACS_SET_TTY_PGRP (input_fd, &me);
883 884 885 886 887 888 889
  setpgrp (0, me);
}

/* Set the tty to our original foreground group.  */
widen_foreground_group ()
{
  if (inherited_pgroup != getpid ())
890
    EMACS_SET_TTY_PGRP (input_fd, &inherited_pgroup);
891 892 893
  setpgrp (0, inherited_pgroup);
}

894
#endif /* BSD_PGRPS */
895

896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926
/* 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
927
#ifndef MSDOS
928 929 930
  /* I give up - I hope you have the BSD ioctls.  */
  if (ioctl (fd, TIOCGETP, &settings->main) < 0)
    return -1;
931
#endif /* not MSDOS */
932 933 934 935 936
#endif
#endif
#endif

  /* Suivant - Do we have to get struct ltchars data?  */
937
#ifdef HAVE_LTCHARS
938 939 940 941 942
  if (ioctl (fd, TIOCGLTC, &settings->ltchars) < 0)
    return -1;
#endif

  /* How about a struct tchars and a wordful of lmode bits?  */
943
#ifdef HAVE_TCHARS
944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966
  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
967
  int i;
968 969 970 971 972 973 974
  /* 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."  */
975
  /* This make sure that we don't loop indefinitely in here.  */
976
  for (i = 0 ; i < 10 ; i++)
977 978 979 980 981 982 983 984 985 986 987 988 989
    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);
990 991 992 993 994 995 996 997 998
	/* 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)
999
	  break;
1000 1001
	else
	  continue;
1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018
      }

#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
1019
#ifndef MSDOS
1020 1021 1022
  /* I give up - I hope you have the BSD ioctls.  */
  if (ioctl (fd, (waitp) ? TIOCSETP : TIOCSETN, &settings->main) < 0)
    return -1;
1023
#endif /* not MSDOS */
1024 1025 1026 1027 1028 1029

#endif
#endif
#endif

  /* Suivant - Do we have to get struct ltchars data?  */
1030
#ifdef HAVE_LTCHARS
1031 1032 1033 1034 1035
  if (ioctl (fd, TIOCSLTC, &settings->ltchars) < 0)
    return -1;
#endif

  /* How about a struct tchars and a wordful of lmode bits?  */
1036
#ifdef HAVE_TCHARS
1037 1038 1039 1040 1041 1042 1043 1044 1045
  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
1046

Jim Blandy's avatar
Jim Blandy committed
1047 1048
/* The initial tty mode bits */
struct emacs_tty old_tty;
Jim Blandy's avatar
Jim Blandy committed
1049 1050 1051

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

Jim Blandy's avatar
Jim Blandy committed
1052 1053 1054 1055 1056 1057
#ifdef BSD4_1
/* BSD 4.1 needs to keep track of the lmode bits in order to start
   sigio.  */
int lmode;
#endif

1058
#ifndef F_SETOWN_BUG
Jim Blandy's avatar
Jim Blandy committed
1059 1060 1061
#ifdef F_SETOWN
int old_fcntl_owner;
#endif /* F_SETOWN */
1062
#endif /* F_SETOWN_BUG */
Jim Blandy's avatar
Jim Blandy committed
1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073

/* 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
 
1074
#ifdef HAVE_LTCHARS
Jim Blandy's avatar
Jim Blandy committed
1075 1076
static struct ltchars new_ltchars = {-1,-1,-1,-1,-1,-1};
#endif
1077
#ifdef HAVE_TCHARS
Jim Blandy's avatar
Jim Blandy committed
1078 1079 1080 1081 1082
  static struct tchars new_tchars = {-1,-1,-1,-1,-1,-1};
#endif 

init_sys_modes ()
{
Jim Blandy's avatar
Jim Blandy committed
1083 1084
  struct emacs_tty tty;

Jim Blandy's avatar
Jim Blandy committed
1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104
#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);
1105
#if 0
Jim Blandy's avatar
Jim Blandy committed
1106 1107 1108 1109 1110 1111 1112
  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.");
1113
#endif
Jim Blandy's avatar
Jim Blandy committed
1114
  if (input_ef / 32 != timer_ef / 32)
1115 1116
    croak ("Input and timer event flags in different clusters.");
#if 0
Jim Blandy's avatar
Jim Blandy committed
1117 1118
  input_eflist = ((unsigned) 1 << (input_ef % 32)) |
    ((unsigned) 1 << (process_ef % 32));
1119
#endif
Jim Blandy's avatar
Jim Blandy committed
1120 1121 1122 1123 1124 1125
  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
1126

1127
#ifdef BSD_PGRPS
1128 1129 1130 1131
  if (! read_socket_hook && EQ (Vwindow_system, Qnil))
    narrow_foreground_group ();
#endif

Jim Blandy's avatar
Jim Blandy committed
1132 1133
  EMACS_GET_TTY (input_fd, &old_tty);

Jim Blandy's avatar
Jim Blandy committed
1134 1135
  if (!read_socket_hook && EQ (Vwindow_system, Qnil))
    {
Jim Blandy's avatar
Jim Blandy committed
1136
      tty = old_tty;
Jim Blandy's avatar
Jim Blandy committed
1137

1138
#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
Jim Blandy's avatar
Jim Blandy committed
1139 1140
      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
1141
#ifdef ISTRIP
Jim Blandy's avatar
Jim Blandy committed
1142
      tty.main.c_iflag &= ~ISTRIP;	/* don't strip 8th bit on input */
Jim Blandy's avatar
Jim Blandy committed
1143
#endif
Jim Blandy's avatar
Jim Blandy committed
1144 1145
      tty.main.c_lflag &= ~ECHO;	/* Disable echo */
      tty.main.c_lflag &= ~ICANON;	/* Disable erase/kill processing */
1146
#ifdef IEXTEN
1147
      tty.main.c_lflag &= ~IEXTEN;	/* Disable other editing characters.  */
1148
#endif
Jim Blandy's avatar
Jim Blandy committed
1149
      tty.main.c_lflag |= ISIG;	/* Enable signals */
Jim Blandy's avatar
Jim Blandy committed
1150 1151
      if (flow_control)
	{
Jim Blandy's avatar
Jim Blandy committed
1152
	  tty.main.c_iflag |= IXON;	/* Enable start/stop output control */
Jim Blandy's avatar
Jim Blandy committed
1153
#ifdef IXANY
Jim Blandy's avatar
Jim Blandy committed
1154
	  tty.main.c_iflag &= ~IXANY;
Jim Blandy's avatar
Jim Blandy committed
1155 1156 1157
#endif /* IXANY */
	}
      else
Jim Blandy's avatar
Jim Blandy committed
1158 1159 1160 1161
	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
1162 1163 1164
#ifdef CS8
      if (meta_key)
	{
Jim Blandy's avatar
Jim Blandy committed
1165 1166
	  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
1167 1168
	}
#endif
Jim Blandy's avatar
Jim Blandy committed
1169
      tty.main.c_cc[VINTR] = quit_char;	/* C-g (usually) gives SIGINT */
Jim Blandy's avatar
Jim Blandy committed
1170 1171 1172
      /* 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
1173 1174 1175
      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
1176
#ifdef VSWTCH
1177
      tty.main.c_cc[VSWTCH] = CDISABLE;	/* Turn off shell layering use
Jim Blandy's avatar
Jim Blandy committed
1178
					   of C-z */
Jim Blandy's avatar
Jim Blandy committed
1179 1180 1181
#endif /* VSWTCH */
#if defined (mips) || defined (HAVE_TCATTR)
#ifdef VSUSP
1182
      tty.main.c_cc[VSUSP] = CDISABLE;	/* Turn off mips handling of C-z.  */
Jim Blandy's avatar
Jim Blandy committed
1183 1184
#endif /* VSUSP */
#ifdef V_DSUSP
1185
      tty.main.c_cc[V_DSUSP] = CDISABLE; /* Turn off mips handling of C-y.  */
Jim Blandy's avatar
Jim Blandy committed
1186
#endif /* V_DSUSP */
1187 1188 1189
#ifdef VDSUSP /* Some systems have VDSUSP, some have V_DSUSP.  */
      tty.main.c_cc[VDSUSP] = CDISABLE;
#endif /* VDSUSP */
1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201
#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 */
Jim Blandy's avatar
Jim Blandy committed
1202 1203 1204 1205
#endif /* mips or HAVE_TCATTR */
#ifdef AIX
#ifndef IBMR2AIX
      /* AIX enhanced edit loses NULs, so disable it */
Jim Blandy's avatar
Jim Blandy committed
1206 1207
      tty.main.c_line = 0;
      tty.main.c_iflag &= ~ASCEDIT;
Jim Blandy's avatar
Jim Blandy committed
1208
#else
Jim Blandy's avatar
Jim Blandy committed
1209 1210 1211 1212
      tty.main.c_cc[VSTRT] = 255;
      tty.main.c_cc[VSTOP] = 255;
      tty.main.c_cc[VSUSP] = 255;
      tty.main.c_cc[VDSUSP] = 255;
Jim Blandy's avatar
Jim Blandy committed
1213 1214 1215 1216 1217
#endif /* IBMR2AIX */
      /* Also, PTY overloads NUL and BREAK.
	 don't ignore break, but don't signal either, so it looks like NUL.
	 This really serves a purpose only if running in an XTERM window
	 or via TELNET or the like, but does no harm elsewhere.  */
Jim Blandy's avatar
Jim Blandy committed
1218 1219
      tty.main.c_iflag &= ~IGNBRK;
      tty.main.c_iflag &= ~BRKINT;
Jim Blandy's avatar
Jim Blandy committed
1220 1221 1222
#endif
#else /* if not HAVE_TERMIO */
#ifdef VMS
Jim Blandy's avatar
Jim Blandy committed
1223
      tty.main.tt_char |= TT$M_NOECHO;
Jim Blandy's avatar
Jim Blandy committed
1224
      if (meta_key)
1225
	tty.main.tt_char |= TT$M_EIGHTBIT;
Jim Blandy's avatar
Jim Blandy committed
1226
      if (flow_control)
Jim Blandy's avatar
Jim Blandy committed
1227
	tty.main.tt_char |= TT$M_TTSYNC;
Jim Blandy's avatar
Jim Blandy committed
1228
      else
Jim Blandy's avatar
Jim Blandy committed
1229 1230
	tty.main.tt_char &= ~TT$M_TTSYNC;
      tty.main.tt2_char |= TT2$M_PASTHRU | TT2$M_XON;
Jim Blandy's avatar
Jim Blandy committed
1231
#else /* not VMS (BSD, that is) */
1232
#ifndef MSDOS
Jim Blandy's avatar
Jim Blandy committed
1233
      tty.main.sg_flags &= ~(ECHO | CRMOD | XTABS);
Jim Blandy's avatar
Jim Blandy committed
1234
      if (meta_key)
Jim Blandy's avatar
Jim Blandy committed
1235 1236
	tty.main.sg_flags |= ANYP;
      tty.main.sg_flags |= interrupt_input ? RAW : CBREAK;
1237
#endif