sysdep.c 111 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Interfaces to system-dependent kernel and library entries.
2
   Copyright (C) 1985, 1986, 1987, 1988, 1993, 1994 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 76
extern int errno;


77 78 79 80 81 82 83 84
#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
85

86
#ifndef MSDOS
Jim Blandy's avatar
Jim Blandy committed
87
#include <sys/ioctl.h>
88
#endif
89
#include "systty.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
90
#include "syswait.h"
Jim Blandy's avatar
Jim Blandy committed
91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114

#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
115
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
116 117 118 119 120 121 122 123 124 125 126
#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
127 128
#include "syssignal.h"
#include "systime.h"
Jim Blandy's avatar
Jim Blandy committed
129

130 131 132 133 134 135 136 137 138
/* 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
139 140 141 142 143 144 145 146 147 148 149 150
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
151
/* The file descriptor for Emacs's input terminal.
152
   Under Unix, this is normaly zero except when using X;
Jim Blandy's avatar
Jim Blandy committed
153 154 155
   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;
156 157 158 159 160 161 162 163 164 165 166

/* 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
167

Jim Blandy's avatar
Jim Blandy committed
168 169
discard_tty_input ()
{
Jim Blandy's avatar
Jim Blandy committed
170
  struct emacs_tty buf;
Jim Blandy's avatar
Jim Blandy committed
171 172 173 174 175 176 177 178 179 180 181

  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
182 183
  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
184 185 186 187 188
  queue_kbd_input ();
#else /* not VMS */
#ifdef APOLLO
  {
    int zero = 0;
189
    ioctl (input_fd, TIOCFLUSH, &zero);
Jim Blandy's avatar
Jim Blandy committed
190 191
  }
#else /* not Apollo */
192 193 194 195
#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
196 197
  EMACS_GET_TTY (input_fd, &buf);
  EMACS_SET_TTY (input_fd, &buf, 0);
198
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
199 200 201 202 203 204
#endif /* not Apollo */
#endif /* not VMS */
}

#ifdef SIGTSTP

205 206 207
/* Arrange for character C to be read as the next input from
   the terminal.  */

Jim Blandy's avatar
Jim Blandy committed
208 209 210 211 212
stuff_char (c)
     char c;
{
/* Should perhaps error if in batch mode */
#ifdef TIOCSTI
213
  ioctl (input_fd, TIOCSTI, &c);
Jim Blandy's avatar
Jim Blandy committed
214
#else /* no TIOCSTI */
215
  error ("Cannot stuff terminal input characters in this version of Unix");
Jim Blandy's avatar
Jim Blandy committed
216 217 218 219
#endif /* no TIOCSTI */
}

#endif /* SIGTSTP */
220

Jim Blandy's avatar
Jim Blandy committed
221 222 223 224 225 226
init_baud_rate ()
{
  if (noninteractive)
    ospeed = 0;
  else
    {
227 228 229
#ifdef MSDOS
    ospeed = 15;
#else
Jim Blandy's avatar
Jim Blandy committed
230
#ifdef VMS
Jim Blandy's avatar
Jim Blandy committed
231 232 233
      struct sensemode sg;

      SYS$QIOW (0, input_fd, IO$_SENSEMODE, &sg, 0, 0,
Jim Blandy's avatar
Jim Blandy committed
234
		&sg.class, 12, 0, 0, 0, 0 );
Jim Blandy's avatar
Jim Blandy committed
235 236
      ospeed = sg.xmit_baud;
#else /* not VMS */
237 238
#ifdef HAVE_TERMIOS
      struct termios sg;
Jim Blandy's avatar
Jim Blandy committed
239

240
      sg.c_cflag = B9600;
241
      tcgetattr (input_fd, &sg);
242
      ospeed = cfgetospeed (&sg);
243 244 245
#else /* neither VMS nor TERMIOS */
#ifdef HAVE_TERMIO
      struct termio sg;
Jim Blandy's avatar
Jim Blandy committed
246

247
      sg.c_cflag = B9600;
248
#ifdef HAVE_TCATTR
249
      tcgetattr (input_fd, &sg);
250
#else
251
      ioctl (input_fd, TCGETA, &sg);
252
#endif
Jim Blandy's avatar
Jim Blandy committed
253
      ospeed = sg.c_cflag & CBAUD;
254
#else /* neither VMS nor TERMIOS nor TERMIO */
Jim Blandy's avatar
Jim Blandy committed
255 256 257
      struct sgttyb sg;
      
      sg.sg_ospeed = B9600;
258
      if (ioctl (input_fd, TIOCGETP, &sg) < 0)
259
	abort ();
Jim Blandy's avatar
Jim Blandy committed
260 261
      ospeed = sg.sg_ospeed;
#endif /* not HAVE_TERMIO */
262
#endif /* not HAVE_TERMIOS */
Jim Blandy's avatar
Jim Blandy committed
263
#endif /* not VMS */
264
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281
    }
   
  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 */
}
282

Jim Blandy's avatar
Jim Blandy committed
283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315
#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;

316
      status = SYS$FORCEX (&pid, 0, 0);
Jim Blandy's avatar
Jim Blandy committed
317 318
      break;
#else /* not VMS */
319
#if defined (BSD) || (defined (HPUX) && !defined (HPUX_5))
320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337
      /* 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);
338 339
#else /* not BSD, and not HPUX version >= 6 */
#if defined (UNIPLUS)
340 341 342
      if (0 > kill (pid, 0))
	break;
      wait (0);
343
#else /* neither BSD nor UNIPLUS: random sysV */
344 345 346 347 348 349 350
#ifdef POSIX_SIGNALS	/* would this work for LINUX as well? */
      sigblock (sigmask (SIGCHLD));
      if (0 > kill (pid, 0))
	{
	  sigunblock (sigmask (SIGCHLD));
	  break;
	}
351
      sigpause (SIGEMPTYMASK);
352
#else /* not POSIX_SIGNALS */
353 354 355 356 357 358 359 360 361 362
#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
363
	break;
364 365 366 367 368
      /* 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 */
369
#endif /* not POSIX_SIGNALS */
370 371
#endif /* not UNIPLUS */
#endif /* not BSD, and not HPUX version >= 6 */
Jim Blandy's avatar
Jim Blandy committed
372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414
#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
}
415

Jim Blandy's avatar
Jim Blandy committed
416 417 418 419 420 421 422 423 424
#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;
{
425
#ifndef MSDOS
Jim Blandy's avatar
Jim Blandy committed
426 427 428
  struct emacs_tty s;

  EMACS_GET_TTY (out, &s);
Jim Blandy's avatar
Jim Blandy committed
429

430
#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
Jim Blandy's avatar
Jim Blandy committed
431 432 433 434 435 436 437 438 439 440
  s.main.c_oflag |= OPOST;	/* Enable output postprocessing */
  s.main.c_oflag &= ~ONLCR;	/* Disable map of NL to CR-NL on output */
  s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
  				/* No output delays */
  s.main.c_lflag &= ~ECHO;	/* Disable echo */
  s.main.c_lflag |= ISIG;	/* Enable signals */
  s.main.c_iflag &= ~IUCLC;	/* Disable map of upper case to lower on
				   input */
  s.main.c_oflag &= ~OLCUC;	/* Disable map of lower case to upper on
				   output */
441
  s.main.c_cflag = (s.main.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
Jim Blandy's avatar
Jim Blandy committed
442
#if 0
443
  /* Said to be unnecessary:  */
Jim Blandy's avatar
Jim Blandy committed
444 445 446 447 448 449 450 451 452
  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
453
#ifdef HPUX
Jim Blandy's avatar
Jim Blandy committed
454
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
455
#endif /* HPUX */
Jim Blandy's avatar
Jim Blandy committed
456

Jim Blandy's avatar
Jim Blandy committed
457 458 459
#ifdef AIX
/* AIX enhanced edit loses NULs, so disable it */
#ifndef IBMR2AIX
Jim Blandy's avatar
Jim Blandy committed
460 461
  s.main.c_line = 0;
  s.main.c_iflag &= ~ASCEDIT;
Jim Blandy's avatar
Jim Blandy committed
462 463 464
#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
465 466 467 468
  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;
469 470 471 472 473 474 475 476 477 478 479
#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
480
  s.main.c_lflag &= ~ISIG;
481 482
#endif /* no TIOCGPGRP or no TIOCGLTC or no TIOCGETC */
  s.main.c_cc[VEOL] = 0377;
Jim Blandy's avatar
Jim Blandy committed
483
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
484 485 486
#endif /* AIX */

#else /* not HAVE_TERMIO */
Jim Blandy's avatar
Jim Blandy committed
487 488 489

  s.main.sg_flags &= ~(ECHO | CRMOD | ANYP | ALLDELAY | RAW | LCASE
		       | CBREAK | TANDEM);
490
  s.main.sg_flags |= LPASS8;
Jim Blandy's avatar
Jim Blandy committed
491 492
  s.main.sg_erase = 0377;
  s.main.sg_kill = 0377;
493
  s.lmode = LLITOUT | s.lmode;        /* Don't strip 8th bit */
Jim Blandy's avatar
Jim Blandy committed
494

Jim Blandy's avatar
Jim Blandy committed
495 496
#endif /* not HAVE_TERMIO */

Jim Blandy's avatar
Jim Blandy committed
497
  EMACS_SET_TTY (out, &s, 0);
Jim Blandy's avatar
Jim Blandy committed
498 499 500 501 502 503 504 505 506 507 508

#ifdef BSD4_1
  if (interrupt_input)
    reset_sigio ();
#endif /* BSD4_1 */
#ifdef RTU
  {
    int zero = 0;
    ioctl (out, FIOASYNC, &zero);
  }
#endif /* RTU */
509
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
510 511 512 513 514 515 516 517 518
}
#endif /* not VMS */

#endif /* subprocesses */

/*ARGSUSED*/
setpgrp_of_tty (pid)
     int pid;
{
Jim Blandy's avatar
Jim Blandy committed
519
  EMACS_SET_TTY_PGRP (input_fd, &pid);
Jim Blandy's avatar
Jim Blandy committed
520
}
521

Jim Blandy's avatar
Jim Blandy committed
522 523 524 525 526 527 528 529 530 531 532
/* 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 ()
{
533 534 535 536
#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
537
#ifdef VMS
538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555
  /* "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 ();

556
  xfree (fpid_string);		/* On VMS, this was malloc'd */
Jim Blandy's avatar
Jim Blandy committed
557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572

  if (parent_id && parent_id != 0xffffffff)
    {
      SIGTYPE (*oldsig)() = (int) signal (SIGINT, SIG_IGN);
      int status = LIB$ATTACH (&parent_id) & 1;
      signal (SIGINT, oldsig);
      return status;
    }
  else
    {
      struct {
	int	l;
	char	*a;
      } d_prompt;
      d_prompt.l = sizeof ("Emacs: ");		/* Our special prompt */
      d_prompt.a = "Emacs: ";			/* Just a reminder */
573
      LIB$SPAWN (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, &d_prompt, 0);
Jim Blandy's avatar
Jim Blandy committed
574 575 576 577
      return 1;
    }
  return -1;
#else
578
#if defined(SIGTSTP) && !defined(MSDOS)
Jim Blandy's avatar
Jim Blandy committed
579

580
  {
581
    int pgrp = EMACS_GETPGRP (0);
582 583
    EMACS_KILLPG (pgrp, SIGTSTP);
  }
Jim Blandy's avatar
Jim Blandy committed
584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613

#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.  */
  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;

614 615 616
#ifdef MSDOS	/* MW, Aug 1993 */
      getwd (oldwd);
#endif
Jim Blandy's avatar
Jim Blandy committed
617 618 619
      sh = (char *) egetenv ("SHELL");
      if (sh == 0)
	sh = "sh";
620

Jim Blandy's avatar
Jim Blandy committed
621 622 623 624 625 626 627 628 629 630
      /* 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");
631
	/* Can't use NILP */
Jim Blandy's avatar
Jim Blandy committed
632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648
	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
649 650 651 652 653 654 655 656 657 658

#ifdef PRIO_PROCESS
      {
	extern int emacs_priority;

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

659 660 661 662 663 664
#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
665 666 667
      execlp (sh, sh, 0);
      write (1, "Can't execute subshell", 22);
      _exit (1);
668
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
669 670 671
    }

  save_signal_handlers (saved_handlers);
672
  synch_process_alive = 1;
Jim Blandy's avatar
Jim Blandy committed
673 674 675 676 677 678 679 680 681 682 683 684 685
  wait_for_termination (pid);
  restore_signal_handlers (saved_handlers);

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

save_signal_handlers (saved_handlers)
     struct save_signal *saved_handlers;
{
  while (saved_handlers->code)
    {
Joseph Arceneaux's avatar
Joseph Arceneaux committed
686 687
      saved_handlers->handler
	= (SIGTYPE (*) ()) signal (saved_handlers->code, SIG_IGN);
Jim Blandy's avatar
Jim Blandy committed
688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708
      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
709
  old_fcntl_flags = fcntl (input_fd, F_GETFL, 0) & ~FASYNC;
Jim Blandy's avatar
Jim Blandy committed
710 711 712 713 714 715 716 717 718
#endif
  request_sigio ();
}

reset_sigio ()
{
  unrequest_sigio ();
}

719
#ifdef FASYNC		/* F_SETFL does not imply existence of FASYNC */
Jim Blandy's avatar
Jim Blandy committed
720 721 722 723

request_sigio ()
{
#ifdef SIGWINCH
Jim Blandy's avatar
Jim Blandy committed
724
  sigunblock (sigmask (SIGWINCH));
Jim Blandy's avatar
Jim Blandy committed
725
#endif
726
  fcntl (input_fd, F_SETFL, old_fcntl_flags | FASYNC);
Jim Blandy's avatar
Jim Blandy committed
727 728 729 730 731 732 733

  interrupts_deferred = 0;
}

unrequest_sigio ()
{
#ifdef SIGWINCH
Jim Blandy's avatar
Jim Blandy committed
734
  sigblock (sigmask (SIGWINCH));
Jim Blandy's avatar
Jim Blandy committed
735
#endif
736
  fcntl (input_fd, F_SETFL, old_fcntl_flags);
Jim Blandy's avatar
Jim Blandy committed
737 738 739 740 741 742 743 744 745
  interrupts_deferred = 1;
}

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

request_sigio ()
{
  int on = 1;
746
  ioctl (input_fd, FIOASYNC, &on);
Jim Blandy's avatar
Jim Blandy committed
747 748 749 750 751 752 753
  interrupts_deferred = 0;
}

unrequest_sigio ()
{
  int off = 0;

754
  ioctl (input_fd, FIOASYNC, &off);
Jim Blandy's avatar
Jim Blandy committed
755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772
  interrupts_deferred = 1;
}

#else /* not FASYNC, not STRIDE */
 
request_sigio ()
{
  croak ("request_sigio");
}
 
unrequest_sigio ()
{
  croak ("unrequest_sigio");
}
 
#endif /* STRIDE */
#endif /* FASYNC */
#endif /* F_SETFL */
773

774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807
/* Saving and restoring the process group of Emacs's terminal.  */

#ifdef BSD

/* 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)
808
    EMACS_SET_TTY_PGRP (input_fd, &me);
809 810 811 812 813 814 815
  setpgrp (0, me);
}

/* Set the tty to our original foreground group.  */
widen_foreground_group ()
{
  if (inherited_pgroup != getpid ())
816
    EMACS_SET_TTY_PGRP (input_fd, &inherited_pgroup);
817 818 819 820 821
  setpgrp (0, inherited_pgroup);
}

#endif

822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852
/* 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
853
#ifndef MSDOS
854 855 856
  /* I give up - I hope you have the BSD ioctls.  */
  if (ioctl (fd, TIOCGETP, &settings->main) < 0)
    return -1;
857
#endif /* not MSDOS */
858 859 860 861 862
#endif
#endif
#endif

  /* Suivant - Do we have to get struct ltchars data?  */
863
#ifdef HAVE_LTCHARS
864 865 866 867 868
  if (ioctl (fd, TIOCGLTC, &settings->ltchars) < 0)
    return -1;
#endif

  /* How about a struct tchars and a wordful of lmode bits?  */
869
#ifdef HAVE_TCHARS
870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892
  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
893
  int i;
894 895 896 897 898 899 900
  /* 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."  */
901
  /* This make sure that we don't loop indefinitely in here.  */
902
  for (i = 0 ; i < 10 ; i++)
903 904 905 906 907 908 909 910 911 912 913 914 915
    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);
916 917 918 919 920 921 922 923 924
	/* 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)
925
	  break;
926 927
	else
	  continue;
928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944
      }

#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
945
#ifndef MSDOS
946 947 948
  /* I give up - I hope you have the BSD ioctls.  */
  if (ioctl (fd, (waitp) ? TIOCSETP : TIOCSETN, &settings->main) < 0)
    return -1;
949
#endif /* not MSDOS */
950 951 952 953 954 955

#endif
#endif
#endif

  /* Suivant - Do we have to get struct ltchars data?  */
956
#ifdef HAVE_LTCHARS
957 958 959 960 961
  if (ioctl (fd, TIOCSLTC, &settings->ltchars) < 0)
    return -1;
#endif

  /* How about a struct tchars and a wordful of lmode bits?  */
962
#ifdef HAVE_TCHARS
963 964 965 966 967 968 969 970 971
  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
972

Jim Blandy's avatar
Jim Blandy committed
973 974
/* The initial tty mode bits */
struct emacs_tty old_tty;
Jim Blandy's avatar
Jim Blandy committed
975 976 977

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

Jim Blandy's avatar
Jim Blandy committed
978 979 980 981 982 983
#ifdef BSD4_1
/* BSD 4.1 needs to keep track of the lmode bits in order to start
   sigio.  */
int lmode;
#endif

984
#ifndef F_SETOWN_BUG
Jim Blandy's avatar
Jim Blandy committed
985 986 987
#ifdef F_SETOWN
int old_fcntl_owner;
#endif /* F_SETOWN */
988
#endif /* F_SETOWN_BUG */
Jim Blandy's avatar
Jim Blandy committed
989 990 991 992 993 994 995 996 997 998 999

/* 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
 
1000
#ifdef HAVE_LTCHARS
Jim Blandy's avatar
Jim Blandy committed
1001 1002
static struct ltchars new_ltchars = {-1,-1,-1,-1,-1,-1};
#endif
1003
#ifdef HAVE_TCHARS
Jim Blandy's avatar
Jim Blandy committed
1004 1005 1006 1007 1008
  static struct tchars new_tchars = {-1,-1,-1,-1,-1,-1};
#endif 

init_sys_modes ()
{
Jim Blandy's avatar
Jim Blandy committed
1009 1010
  struct emacs_tty tty;

Jim Blandy's avatar
Jim Blandy committed
1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
#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);
1031
#if 0
Jim Blandy's avatar
Jim Blandy committed
1032 1033 1034 1035 1036 1037 1038
  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.");
1039
#endif
Jim Blandy's avatar
Jim Blandy committed
1040
  if (input_ef / 32 != timer_ef / 32)
1041 1042
    croak ("Input and timer event flags in different clusters.");
#if 0
Jim Blandy's avatar
Jim Blandy committed
1043 1044
  input_eflist = ((unsigned) 1 << (input_ef % 32)) |
    ((unsigned) 1 << (process_ef % 32));
1045
#endif
Jim Blandy's avatar
Jim Blandy committed
1046 1047 1048 1049 1050 1051
  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
1052

1053 1054 1055 1056 1057
#ifdef BSD
  if (! read_socket_hook && EQ (Vwindow_system, Qnil))
    narrow_foreground_group ();
#endif

Jim Blandy's avatar
Jim Blandy committed
1058 1059
  EMACS_GET_TTY (input_fd, &old_tty);

Jim Blandy's avatar
Jim Blandy committed
1060 1061
  if (!read_socket_hook && EQ (Vwindow_system, Qnil))
    {
Jim Blandy's avatar
Jim Blandy committed
1062
      tty = old_tty;
Jim Blandy's avatar
Jim Blandy committed
1063

1064
#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
Jim Blandy's avatar
Jim Blandy committed
1065 1066
      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
1067
#ifdef ISTRIP
Jim Blandy's avatar
Jim Blandy committed
1068
      tty.main.c_iflag &= ~ISTRIP;	/* don't strip 8th bit on input */
Jim Blandy's avatar
Jim Blandy committed
1069
#endif
Jim Blandy's avatar
Jim Blandy committed
1070 1071
      tty.main.c_lflag &= ~ECHO;	/* Disable echo */
      tty.main.c_lflag &= ~ICANON;	/* Disable erase/kill processing */
1072 1073 1074
#ifdef IEXTEN
      tty.main.c_iflag &= ~IEXTEN;	/* Disable other editing characters.  */
#endif
Jim Blandy's avatar
Jim Blandy committed
1075
      tty.main.c_lflag |= ISIG;	/* Enable signals */
Jim Blandy's avatar
Jim Blandy committed
1076 1077
      if (flow_control)
	{
Jim Blandy's avatar
Jim Blandy committed
1078
	  tty.main.c_iflag |= IXON;	/* Enable start/stop output control */
Jim Blandy's avatar
Jim Blandy committed
1079
#ifdef IXANY
Jim Blandy's avatar
Jim Blandy committed
1080
	  tty.main.c_iflag &= ~IXANY;
Jim Blandy's avatar
Jim Blandy committed
1081 1082 1083
#endif /* IXANY */
	}
      else
Jim Blandy's avatar
Jim Blandy committed
1084 1085 1086 1087
	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
1088 1089 1090
#ifdef CS8
      if (meta_key)
	{
Jim Blandy's avatar
Jim Blandy committed
1091 1092
	  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
1093 1094
	}
#endif
Jim Blandy's avatar
Jim Blandy committed
1095
      tty.main.c_cc[VINTR] = quit_char;	/* C-g (usually) gives SIGINT */
Jim Blandy's avatar
Jim Blandy committed
1096 1097 1098
      /* 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
1099 1100 1101
      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
1102
#ifdef VSWTCH
1103
      tty.main.c_cc[VSWTCH] = CDISABLE;	/* Turn off shell layering use
Jim Blandy's avatar
Jim Blandy committed
1104
					   of C-z */
Jim Blandy's avatar
Jim Blandy committed
1105 1106 1107
#endif /* VSWTCH */
#if defined (mips) || defined (HAVE_TCATTR)
#ifdef VSUSP
1108
      tty.main.c_cc[VSUSP] = CDISABLE;	/* Turn off mips handling of C-z.  */
Jim Blandy's avatar
Jim Blandy committed
1109 1110
#endif /* VSUSP */
#ifdef V_DSUSP
1111
      tty.main.c_cc[V_DSUSP] = CDISABLE; /* Turn off mips handling of C-y.  */
Jim Blandy's avatar
Jim Blandy committed
1112
#endif /* V_DSUSP */
1113 1114 1115
#ifdef VDSUSP /* Some systems have VDSUSP, some have V_DSUSP.  */
      tty.main.c_cc[VDSUSP] = CDISABLE;
#endif /* VDSUSP */
1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127
#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
1128 1129 1130 1131
#endif /* mips or HAVE_TCATTR */
#ifdef AIX
#ifndef IBMR2AIX
      /* AIX enhanced edit loses NULs, so disable it */
Jim Blandy's avatar
Jim Blandy committed
1132 1133
      tty.main.c_line = 0;
      tty.main.c_iflag &= ~ASCEDIT;
Jim Blandy's avatar
Jim Blandy committed
1134
#else
Jim Blandy's avatar
Jim Blandy committed
1135 1136 1137 1138
      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
1139 1140 1141 1142 1143
#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
1144 1145
      tty.main.c_iflag &= ~IGNBRK;
      tty.main.c_iflag &= ~BRKINT;
Jim Blandy's avatar
Jim Blandy committed
1146 1147 1148
#endif
#else /* if not HAVE_TERMIO */
#ifdef VMS
Jim Blandy's avatar
Jim Blandy committed
1149
      tty.main.tt_char |= TT$M_NOECHO;
Jim Blandy's avatar
Jim Blandy committed
1150
      if (meta_key)
1151
	tty.main.tt_char |= TT$M_EIGHTBIT;
Jim Blandy's avatar
Jim Blandy committed
1152
      if (flow_control)
Jim Blandy's avatar
Jim Blandy committed
1153
	tty.main.tt_char |= TT$M_TTSYNC;
Jim Blandy's avatar
Jim Blandy committed
1154
      else
Jim Blandy's avatar
Jim Blandy committed
1155 1156
	tty.main.tt_char &= ~TT$M_TTSYNC;
      tty.main.tt2_char |= TT2$M_PASTHRU | TT2$M_XON;
Jim Blandy's avatar
Jim Blandy committed
1157
#else /* not VMS (BSD, that is) */
1158
#ifndef MSDOS
Jim Blandy's avatar
Jim Blandy committed
1159
      tty.main.sg_flags &= ~(ECHO | CRMOD | XTABS);
Jim Blandy's avatar
Jim Blandy committed
1160
      if (meta_key)
Jim Blandy's avatar
Jim Blandy committed
1161 1162
	tty.main.sg_flags |= ANYP;
      tty.main.sg_flags |= interrupt_input ? RAW : CBREAK;
1163
#endif
Jim Blandy's avatar
Jim Blandy committed
1164 1165 1166
#endif /* not VMS (BSD, that is) */
#endif /* not HAVE_TERMIO */

Jim Blandy's avatar
Jim Blandy committed
1167 1168 1169 1170 1171 1172
      /* If going to use CBREAK mode, we must request C-g to interrupt
	 and turn off start and stop chars, etc.  If not going to use
	 CBREAK mode, do this anyway so as to turn off local flow
	 control for user coming over network on 4.2; in this case,
	 only t_stopc and t_startc really matter.  */
#ifndef HAVE_TERMIO
1173
#ifdef HAVE_TCHARS
Jim Blandy's avatar
Jim Blandy committed
1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184
      /* Note: if not using CBREAK mode, it makes no difference how we
	 set this */
      tty.tchars = new_tchars;
      tty.tchars.t_intrc = quit_char;
      if (flow_control)
	{
	  tty.tchars.t_startc = '\021';
	  tty.tchars.t_stopc = '\023';
	}

      tty.lmode = LDECCTQ | LLITOUT | LPASS8 | LNOFLSH | old_tty.lmode;
1185 1186 1187 1188 1189
#ifdef ultrix
      /* Under Ultrix 4.2a, leaving this out doesn't seem to hurt
	 anything, and leaving it in breaks the meta key.  Go figure.  */
      tty.lmode &= ~LLITOUT;
#endif
Jim Blandy's avatar
Jim Blandy committed
1190 1191 1192 1193 1194
      
#ifdef BSD4_1
      lmode = tty.lmode;
#endif

1195
#endif /* HAVE_TCHARS */
Jim Blandy's avatar
Jim Blandy committed
1196 1197
#endif /* not HAVE_TERMIO */

1198
#ifdef HAVE_LTCHARS
Jim Blandy's avatar
Jim Blandy committed
1199
      tty.ltchars = new_ltchars;
1200
#endif /* HAVE_LTCHARS */
1201 1202 1203 1204
#ifdef MSDOS	/* Demacs 1.1.2 91/10/20 Manabu Higashida, MW Aug 1993 */
      internal_terminal_init ();
      dos_ttraw ();
#endif
Jim Blandy's avatar
Jim Blandy committed
1205 1206

      EMACS_SET_TTY (input_fd, &tty, 0);
Jim Blandy's avatar
Jim Blandy committed
1207 1208

      /* This code added to insure that, if flow-control is not to be used,
Jim Blandy's avatar
Jim Blandy committed
1209
	 we have an unlocked terminal at the start. */
Jim Blandy's avatar
Jim Blandy committed
1210

Jim Blandy's avatar
Jim Blandy committed
1211
#ifdef TCXONC
1212
      if (!flow_control) ioctl (input_fd, TCXONC, 1);
Jim Blandy's avatar
Jim Blandy committed
1213 1214 1215
#endif
#ifndef APOLLO
#ifdef TIOCSTART
1216
      if (!flow_control) ioctl (input_fd, TIOCSTART, 0);
Jim Blandy's avatar
Jim Blandy committed
1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235
#endif
#endif

#ifdef AIX
      hft_init ();
#ifdef IBMR2AIX
      {
	/* IBM's HFT device usually thinks a ^J should be LF/CR.  We need it
	   to be only LF.  This is the way that is done. */
	struct termio tty;

	if (ioctl (1, HFTGETID, &tty) != -1)
	  write (1, "\033[20l", 5);
      }
#endif
#endif

#ifdef VMS
/*  Appears to do nothing when in PASTHRU mode.
Jim Blandy's avatar
Jim Blandy committed
1236