sysdep.c 105 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Interfaces to system-dependent kernel and library entries.
Jim Blandy's avatar
Jim Blandy committed
2
   Copyright (C) 1985, 1986, 1987, 1988, 1993 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

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
the Free Software Foundation; either version 1, or (at your option)
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>

#include "config.h"
#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 67 68 69 70 71 72 73 74 75 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
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>

extern int errno;
#ifndef VMS
extern char *sys_errlist[];
#endif

#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
101
#ifndef USG5
Jim Blandy's avatar
Jim Blandy committed
102 103
#include <fcntl.h>
#endif
104
#endif
Jim Blandy's avatar
Jim Blandy committed
105 106
#endif /* not 4.1 bsd */

107 108 109 110 111 112 113 114
#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
115 116

#include <sys/ioctl.h>
117
#include "systty.h"
Jim Blandy's avatar
Jim Blandy committed
118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149

#ifdef BSD
#ifdef BSD4_1
#include <wait.h>
#else /* not 4.1 */
#include <sys/wait.h>
#endif /* not 4.1 */
#endif /* BSD */

#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
150
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
151 152 153 154 155 156 157 158 159 160 161
#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
162 163
#include "syssignal.h"
#include "systime.h"
Jim Blandy's avatar
Jim Blandy committed
164 165 166 167 168 169 170 171 172 173 174 175 176

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
177 178 179 180 181 182
/* The file descriptor for Emacs's input terminal.
   Under Unix, this is always left zero;
   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;

Jim Blandy's avatar
Jim Blandy committed
183 184
discard_tty_input ()
{
Jim Blandy's avatar
Jim Blandy committed
185
  struct emacs_tty buf;
Jim Blandy's avatar
Jim Blandy committed
186 187 188 189 190 191 192 193 194 195 196

  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
197 198
  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
199 200 201 202 203 204 205 206
  queue_kbd_input ();
#else /* not VMS */
#ifdef APOLLO
  {
    int zero = 0;
    ioctl (0, TIOCFLUSH, &zero);
  }
#else /* not Apollo */
Jim Blandy's avatar
Jim Blandy committed
207 208
  EMACS_GET_TTY (input_fd, &buf);
  EMACS_SET_TTY (input_fd, &buf, 0);
Jim Blandy's avatar
Jim Blandy committed
209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234
#endif /* not Apollo */
#endif /* not VMS */
}

#ifdef SIGTSTP

stuff_char (c)
     char c;
{
/* Should perhaps error if in batch mode */
#ifdef TIOCSTI
  ioctl (0, TIOCSTI, &c);
#else /* no TIOCSTI */
  error ("Cannot stuff terminal input characters in this version of Unix.");
#endif /* no TIOCSTI */
}

#endif /* SIGTSTP */

init_baud_rate ()
{
  if (noninteractive)
    ospeed = 0;
  else
    {
#ifdef VMS
Jim Blandy's avatar
Jim Blandy committed
235 236 237
      struct sensemode sg;

      SYS$QIOW (0, input_fd, IO$_SENSEMODE, &sg, 0, 0,
Jim Blandy's avatar
Jim Blandy committed
238
		&sg.class, 12, 0, 0, 0, 0 );
Jim Blandy's avatar
Jim Blandy committed
239 240
      ospeed = sg.xmit_baud;
#else /* not VMS */
241 242
#ifdef HAVE_TERMIOS
      struct termios sg;
Jim Blandy's avatar
Jim Blandy committed
243 244 245

      sg.c_cflag = (sg.c_cflag & ~CBAUD) | B9600;
      tcgetattr (0, &sg);
246
      ospeed = cfgetospeed (&sg);
247 248 249
#else /* neither VMS nor TERMIOS */
#ifdef HAVE_TERMIO
      struct termio sg;
Jim Blandy's avatar
Jim Blandy committed
250 251

      sg.c_cflag = (sg.c_cflag & ~CBAUD) | B9600;
252
#ifdef HAVE_TCATTR
Jim Blandy's avatar
Jim Blandy committed
253
      tcgetattr (0, &sg);
254
#else
255
      ioctl (input_fd, TCGETA, &sg);
256
#endif
Jim Blandy's avatar
Jim Blandy committed
257
      ospeed = sg.c_cflag & CBAUD;
258
#else /* neither VMS nor TERMIOS nor TERMIO */
Jim Blandy's avatar
Jim Blandy committed
259 260 261
      struct sgttyb sg;
      
      sg.sg_ospeed = B9600;
262 263
      if (ioctl (0, TIOCGETP, &sg) < 0)
	abort ();
Jim Blandy's avatar
Jim Blandy committed
264 265
      ospeed = sg.sg_ospeed;
#endif /* not HAVE_TERMIO */
266
#endif /* not HAVE_TERMIOS */
Jim Blandy's avatar
Jim Blandy committed
267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318
#endif /* not VMS */
    }
   
  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 */
}

#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;

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

#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;
{
Jim Blandy's avatar
Jim Blandy committed
428 429 430
  struct emacs_tty s;

  EMACS_GET_TTY (out, &s);
Jim Blandy's avatar
Jim Blandy committed
431

432
#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
Jim Blandy's avatar
Jim Blandy committed
433 434 435 436 437 438 439 440 441 442 443
  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 */
#if 0
444
  /* Said to be unnecessary:  */
Jim Blandy's avatar
Jim Blandy committed
445 446 447 448 449 450 451 452 453
  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
454
#ifdef HPUX
Jim Blandy's avatar
Jim Blandy committed
455
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
456
#endif /* HPUX */
Jim Blandy's avatar
Jim Blandy committed
457

Jim Blandy's avatar
Jim Blandy committed
458 459 460
#ifdef AIX
/* AIX enhanced edit loses NULs, so disable it */
#ifndef IBMR2AIX
Jim Blandy's avatar
Jim Blandy committed
461 462
  s.main.c_line = 0;
  s.main.c_iflag &= ~ASCEDIT;
Jim Blandy's avatar
Jim Blandy committed
463 464 465
#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
466 467 468 469
  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;
470 471 472 473 474 475 476 477 478 479 480
#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
481
  s.main.c_lflag &= ~ISIG;
482 483
#endif /* no TIOCGPGRP or no TIOCGLTC or no TIOCGETC */
  s.main.c_cc[VEOL] = 0377;
Jim Blandy's avatar
Jim Blandy committed
484
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
485 486 487
#endif /* AIX */

#else /* not HAVE_TERMIO */
Jim Blandy's avatar
Jim Blandy committed
488 489 490 491 492 493

  s.main.sg_flags &= ~(ECHO | CRMOD | ANYP | ALLDELAY | RAW | LCASE
		       | CBREAK | TANDEM);
  s.main.sg_erase = 0377;
  s.main.sg_kill = 0377;

Jim Blandy's avatar
Jim Blandy committed
494 495
#endif /* not HAVE_TERMIO */

Jim Blandy's avatar
Jim Blandy committed
496
  EMACS_SET_TTY (out, &s, 0);
Jim Blandy's avatar
Jim Blandy committed
497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516

#ifdef BSD4_1
  if (interrupt_input)
    reset_sigio ();
#endif /* BSD4_1 */
#ifdef RTU
  {
    int zero = 0;
    ioctl (out, FIOASYNC, &zero);
  }
#endif /* RTU */
}
#endif /* not VMS */

#endif /* subprocesses */

/*ARGSUSED*/
setpgrp_of_tty (pid)
     int pid;
{
Jim Blandy's avatar
Jim Blandy committed
517
  EMACS_SET_TTY_PGRP (input_fd, &pid);
Jim Blandy's avatar
Jim Blandy committed
518 519 520 521 522 523 524 525 526 527 528 529 530 531
}

/* 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
532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549
  /* "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 ();

550
  xfree (fpid_string);		/* On VMS, this was malloc'd */
Jim Blandy's avatar
Jim Blandy committed
551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566

  if (parent_id && parent_id != 0xffffffff)
    {
      SIGTYPE (*oldsig)() = (int) signal (SIGINT, SIG_IGN);
      int status = LIB$ATTACH (&parent_id) & 1;
      signal (SIGINT, oldsig);
      return status;
    }
  else
    {
      struct {
	int	l;
	char	*a;
      } d_prompt;
      d_prompt.l = sizeof ("Emacs: ");		/* Our special prompt */
      d_prompt.a = "Emacs: ";			/* Just a reminder */
567
      LIB$SPAWN (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, &d_prompt, 0);
Jim Blandy's avatar
Jim Blandy committed
568 569 570 571 572 573
      return 1;
    }
  return -1;
#else
#ifdef SIGTSTP

574 575 576 577 578 579 580 581
  {
#ifdef USG
    int pgrp = getpgrp ();
#else
    int pgrp = getpgrp (0);
#endif
    EMACS_KILLPG (pgrp, SIGTSTP);
  }
Jim Blandy's avatar
Jim Blandy committed
582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642

#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;

      sh = (char *) egetenv ("SHELL");
      if (sh == 0)
	sh = "sh";
      /* 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");
	/* Can't use NULL */
	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
643 644 645 646 647 648 649 650 651 652

#ifdef PRIO_PROCESS
      {
	extern int emacs_priority;

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

Jim Blandy's avatar
Jim Blandy committed
653 654 655 656 657 658
      execlp (sh, sh, 0);
      write (1, "Can't execute subshell", 22);
      _exit (1);
    }

  save_signal_handlers (saved_handlers);
659
  synch_process_alive = 1;
Jim Blandy's avatar
Jim Blandy committed
660 661 662 663 664 665 666 667 668 669 670 671 672
  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
673 674
      saved_handlers->handler
	= (SIGTYPE (*) ()) signal (saved_handlers->code, SIG_IGN);
Jim Blandy's avatar
Jim Blandy committed
675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705
      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
  old_fcntl_flags = fcntl (0, F_GETFL, 0) & ~FASYNC;
#endif
  request_sigio ();
}

reset_sigio ()
{
  unrequest_sigio ();
}

706
#ifdef FASYNC		/* F_SETFL does not imply existence of FASYNC */
Jim Blandy's avatar
Jim Blandy committed
707 708 709 710

request_sigio ()
{
#ifdef SIGWINCH
Jim Blandy's avatar
Jim Blandy committed
711
  sigunblock (sigmask (SIGWINCH));
Jim Blandy's avatar
Jim Blandy committed
712 713 714 715 716 717 718 719 720
#endif
  fcntl (0, F_SETFL, old_fcntl_flags | FASYNC);

  interrupts_deferred = 0;
}

unrequest_sigio ()
{
#ifdef SIGWINCH
Jim Blandy's avatar
Jim Blandy committed
721
  sigblock (sigmask (SIGWINCH));
Jim Blandy's avatar
Jim Blandy committed
722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759
#endif
  fcntl (0, F_SETFL, old_fcntl_flags);
  interrupts_deferred = 1;
}

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

request_sigio ()
{
  int on = 1;
  ioctl (0, FIOASYNC, &on);
  interrupts_deferred = 0;
}

unrequest_sigio ()
{
  int off = 0;

  ioctl (0, FIOASYNC, &off);
  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 */
760

761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808
/* 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)
    EMACS_SET_TTY_PGRP (0, &me);
  setpgrp (0, me);
}

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

#endif

809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848
/* 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
  /* I give up - I hope you have the BSD ioctls.  */
  if (ioctl (fd, TIOCGETP, &settings->main) < 0)
    return -1;

#endif
#endif
#endif

  /* Suivant - Do we have to get struct ltchars data?  */
849
#ifdef HAVE_LTCHARS
850 851 852 853 854
  if (ioctl (fd, TIOCGLTC, &settings->ltchars) < 0)
    return -1;
#endif

  /* How about a struct tchars and a wordful of lmode bits?  */
855
#ifdef HAVE_TCHARS
856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878
  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
879
  int i;
880 881 882 883 884 885 886
  /* 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."  */
887
  /* This make sure that we don't loop indefinitely in here.  */
888
  for (i = 0 ; i < 10 ; i++)
889 890 891 892 893 894 895 896 897 898 899 900 901
    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);
902 903 904 905 906 907 908 909 910
	/* 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)
911
	  break;
912 913
	else
	  continue;
914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939
      }

#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
  /* I give up - I hope you have the BSD ioctls.  */
  if (ioctl (fd, (waitp) ? TIOCSETP : TIOCSETN, &settings->main) < 0)
    return -1;

#endif
#endif
#endif

  /* Suivant - Do we have to get struct ltchars data?  */
940
#ifdef HAVE_LTCHARS
941 942 943 944 945
  if (ioctl (fd, TIOCSLTC, &settings->ltchars) < 0)
    return -1;
#endif

  /* How about a struct tchars and a wordful of lmode bits?  */
946
#ifdef HAVE_TCHARS
947 948 949 950 951 952 953 954 955
  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
956

Jim Blandy's avatar
Jim Blandy committed
957 958
/* The initial tty mode bits */
struct emacs_tty old_tty;
Jim Blandy's avatar
Jim Blandy committed
959 960 961

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

Jim Blandy's avatar
Jim Blandy committed
962 963 964 965 966 967
#ifdef BSD4_1
/* BSD 4.1 needs to keep track of the lmode bits in order to start
   sigio.  */
int lmode;
#endif

968
#ifndef F_SETOWN_BUG
Jim Blandy's avatar
Jim Blandy committed
969 970 971
#ifdef F_SETOWN
int old_fcntl_owner;
#endif /* F_SETOWN */
972
#endif /* F_SETOWN_BUG */
Jim Blandy's avatar
Jim Blandy committed
973 974 975 976 977 978 979 980 981 982 983

/* 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
 
984
#ifdef HAVE_LTCHARS
Jim Blandy's avatar
Jim Blandy committed
985 986
static struct ltchars new_ltchars = {-1,-1,-1,-1,-1,-1};
#endif
987
#ifdef HAVE_TCHARS
Jim Blandy's avatar
Jim Blandy committed
988 989 990 991 992
  static struct tchars new_tchars = {-1,-1,-1,-1,-1,-1};
#endif 

init_sys_modes ()
{
Jim Blandy's avatar
Jim Blandy committed
993 994
  struct emacs_tty tty;

Jim Blandy's avatar
Jim Blandy committed
995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014
#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);
1015
#if 0
Jim Blandy's avatar
Jim Blandy committed
1016 1017 1018 1019 1020 1021 1022
  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.");
1023
#endif
Jim Blandy's avatar
Jim Blandy committed
1024
  if (input_ef / 32 != timer_ef / 32)
1025 1026
    croak ("Input and timer event flags in different clusters.");
#if 0
Jim Blandy's avatar
Jim Blandy committed
1027 1028
  input_eflist = ((unsigned) 1 << (input_ef % 32)) |
    ((unsigned) 1 << (process_ef % 32));
1029
#endif
Jim Blandy's avatar
Jim Blandy committed
1030 1031 1032 1033 1034 1035
  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
1036

1037 1038 1039 1040 1041
#ifdef BSD
  if (! read_socket_hook && EQ (Vwindow_system, Qnil))
    narrow_foreground_group ();
#endif

Jim Blandy's avatar
Jim Blandy committed
1042 1043
  EMACS_GET_TTY (input_fd, &old_tty);

Jim Blandy's avatar
Jim Blandy committed
1044 1045
  if (!read_socket_hook && EQ (Vwindow_system, Qnil))
    {
Jim Blandy's avatar
Jim Blandy committed
1046
      tty = old_tty;
Jim Blandy's avatar
Jim Blandy committed
1047

1048
#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
Jim Blandy's avatar
Jim Blandy committed
1049 1050
      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
1051
#ifdef ISTRIP
Jim Blandy's avatar
Jim Blandy committed
1052
      tty.main.c_iflag &= ~ISTRIP;	/* don't strip 8th bit on input */
Jim Blandy's avatar
Jim Blandy committed
1053
#endif
Jim Blandy's avatar
Jim Blandy committed
1054 1055
      tty.main.c_lflag &= ~ECHO;	/* Disable echo */
      tty.main.c_lflag &= ~ICANON;	/* Disable erase/kill processing */
1056 1057 1058
#ifdef IEXTEN
      tty.main.c_iflag &= ~IEXTEN;	/* Disable other editing characters.  */
#endif
Jim Blandy's avatar
Jim Blandy committed
1059
      tty.main.c_lflag |= ISIG;	/* Enable signals */
Jim Blandy's avatar
Jim Blandy committed
1060 1061
      if (flow_control)
	{
Jim Blandy's avatar
Jim Blandy committed
1062
	  tty.main.c_iflag |= IXON;	/* Enable start/stop output control */
Jim Blandy's avatar
Jim Blandy committed
1063
#ifdef IXANY
Jim Blandy's avatar
Jim Blandy committed
1064
	  tty.main.c_iflag &= ~IXANY;
Jim Blandy's avatar
Jim Blandy committed
1065 1066 1067
#endif /* IXANY */
	}
      else
Jim Blandy's avatar
Jim Blandy committed
1068 1069 1070 1071
	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
1072 1073 1074
#ifdef CS8
      if (meta_key)
	{
Jim Blandy's avatar
Jim Blandy committed
1075 1076
	  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
1077 1078
	}
#endif
Jim Blandy's avatar
Jim Blandy committed
1079
      tty.main.c_cc[VINTR] = quit_char;	/* C-g (usually) gives SIGINT */
Jim Blandy's avatar
Jim Blandy committed
1080 1081 1082
      /* 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
1083 1084 1085
      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
1086
#ifdef VSWTCH
1087
      tty.main.c_cc[VSWTCH] = CDISABLE;	/* Turn off shell layering use
Jim Blandy's avatar
Jim Blandy committed
1088
					   of C-z */
Jim Blandy's avatar
Jim Blandy committed
1089 1090 1091
#endif /* VSWTCH */
#if defined (mips) || defined (HAVE_TCATTR)
#ifdef VSUSP
1092
      tty.main.c_cc[VSUSP] = CDISABLE;	/* Turn off mips handling of C-z.  */
Jim Blandy's avatar
Jim Blandy committed
1093 1094
#endif /* VSUSP */
#ifdef V_DSUSP
1095
      tty.main.c_cc[V_DSUSP] = CDISABLE; /* Turn off mips handling of C-y.  */
Jim Blandy's avatar
Jim Blandy committed
1096
#endif /* V_DSUSP */
1097 1098 1099
#ifdef VDSUSP /* Some systems have VDSUSP, some have V_DSUSP.  */
      tty.main.c_cc[VDSUSP] = CDISABLE;
#endif /* VDSUSP */
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111
#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
1112 1113 1114 1115
#endif /* mips or HAVE_TCATTR */
#ifdef AIX
#ifndef IBMR2AIX
      /* AIX enhanced edit loses NULs, so disable it */
Jim Blandy's avatar
Jim Blandy committed
1116 1117
      tty.main.c_line = 0;
      tty.main.c_iflag &= ~ASCEDIT;
Jim Blandy's avatar
Jim Blandy committed
1118
#else
Jim Blandy's avatar
Jim Blandy committed
1119 1120 1121 1122
      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
1123 1124 1125 1126 1127
#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
1128 1129
      tty.main.c_iflag &= ~IGNBRK;
      tty.main.c_iflag &= ~BRKINT;
Jim Blandy's avatar
Jim Blandy committed
1130 1131 1132
#endif
#else /* if not HAVE_TERMIO */
#ifdef VMS
Jim Blandy's avatar
Jim Blandy committed
1133
      tty.main.tt_char |= TT$M_NOECHO;
Jim Blandy's avatar
Jim Blandy committed
1134
      if (meta_key)
1135
	tty.main.tt_char |= TT$M_EIGHTBIT;
Jim Blandy's avatar
Jim Blandy committed
1136
      if (flow_control)
Jim Blandy's avatar
Jim Blandy committed
1137
	tty.main.tt_char |= TT$M_TTSYNC;
Jim Blandy's avatar
Jim Blandy committed
1138
      else
Jim Blandy's avatar
Jim Blandy committed
1139 1140
	tty.main.tt_char &= ~TT$M_TTSYNC;
      tty.main.tt2_char |= TT2$M_PASTHRU | TT2$M_XON;
Jim Blandy's avatar
Jim Blandy committed
1141
#else /* not VMS (BSD, that is) */
Jim Blandy's avatar
Jim Blandy committed
1142
      tty.main.sg_flags &= ~(ECHO | CRMOD | XTABS);
Jim Blandy's avatar
Jim Blandy committed
1143
      if (meta_key)
Jim Blandy's avatar
Jim Blandy committed
1144 1145
	tty.main.sg_flags |= ANYP;
      tty.main.sg_flags |= interrupt_input ? RAW : CBREAK;
Jim Blandy's avatar
Jim Blandy committed
1146 1147 1148
#endif /* not VMS (BSD, that is) */
#endif /* not HAVE_TERMIO */

Jim Blandy's avatar
Jim Blandy committed
1149 1150 1151 1152 1153 1154
      /* 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
1155
#ifdef HAVE_TCHARS
Jim Blandy's avatar
Jim Blandy committed
1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168
      /* 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';
	}

/* LPASS8 is new in 4.3, and makes cbreak mode provide all 8 bits.  */
#ifndef LPASS8
#define LPASS8 0
Jim Blandy's avatar
Jim Blandy committed
1169
#endif
Jim Blandy's avatar
Jim Blandy committed
1170 1171 1172 1173 1174 1175

#ifdef BSD4_1
#define LNOFLSH 0100000
#endif

      tty.lmode = LDECCTQ | LLITOUT | LPASS8 | LNOFLSH | old_tty.lmode;
1176 1177 1178 1179 1180
#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
1181 1182 1183 1184 1185
      
#ifdef BSD4_1
      lmode = tty.lmode;
#endif

1186
#endif /* HAVE_TCHARS */
Jim Blandy's avatar
Jim Blandy committed
1187 1188
#endif /* not HAVE_TERMIO */

1189
#ifdef HAVE_LTCHARS
Jim Blandy's avatar
Jim Blandy committed
1190
      tty.ltchars = new_ltchars;
1191
#endif /* HAVE_LTCHARS */
Jim Blandy's avatar
Jim Blandy committed
1192 1193

      EMACS_SET_TTY (input_fd, &tty, 0);
Jim Blandy's avatar
Jim Blandy committed
1194 1195

      /* This code added to insure that, if flow-control is not to be used,
Jim Blandy's avatar
Jim Blandy committed
1196
	 we have an unlocked terminal at the start. */
Jim Blandy's avatar
Jim Blandy committed
1197

Jim Blandy's avatar
Jim Blandy committed
1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222
#ifdef TCXONC
      if (!flow_control) ioctl (0, TCXONC, 1);
#endif
#ifndef APOLLO
#ifdef TIOCSTART
      if (!flow_control) ioctl (0, TIOCSTART, 0);
#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
1223
      SYS$QIOW (0, input_fd, IO$_SETMODE|IO$M_OUTBAND, 0, 0, 0,
Jim Blandy's avatar
Jim Blandy committed
1224 1225 1226 1227 1228 1229 1230
		interrupt_signal, oob_chars, 0, 0, 0, 0);
*/
      queue_kbd_input (0);
#endif /* VMS */
    }

#ifdef F_SETFL
1231
#ifndef F_SETOWN_BUG
1232
#ifdef F_GETOWN		/* F_SETFL does not imply existence of F_GETOWN */
Jim Blandy's avatar
Jim Blandy committed
1233 1234 1235 1236 1237 1238 1239
  if (interrupt_input)
    {
      old_fcntl_owner = fcntl (0, F_GETOWN, 0);
      fcntl (0, F_SETOWN, getpid ());
      init_sigio ();
    }
#endif /* F_GETOWN */
1240
#endif /* F_SETOWN_BUG */
Jim Blandy's avatar
Jim Blandy committed
1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266
#endif /* F_SETFL */

#ifdef BSD4_1
  if (interrupt_input)
    init_sigio ();
#endif

#ifdef VMS  /* VMS sometimes has this symbol but lacks setvbuf.  */
#undef _IOFBF
#endif
#ifdef _IOFBF
  /* This symbol is defined on recent USG systems.
     Someone says without this call USG won't really buffer the file
     even with a call to setbuf. */
  setvbuf (stdout, _sobuf, _IOFBF, sizeof _sobuf);
#else
  setbuf (stdout, _sobuf);
#endif
  set_terminal_modes ();
  if (term_initted && no_redraw_on_reenter)
    {
      if (display_completed)
	direct_output_forward_char (0);
    }
  else
    {
Jim Blandy's avatar
Jim Blandy committed
1267 1268 1269 1270
      frame_garbaged = 1;
#ifdef MULTI_FRAME
      if (FRAMEP (Vterminal_frame))
	FRAME_GARBAGED_P (XFRAME (Vterminal_frame)) = 1;
Jim Blandy's avatar
Jim Blandy committed
1271 1272
#endif
    }
Jim Blandy's avatar
Jim Blandy committed
1273

Jim Blandy's avatar
Jim Blandy committed
1274 1275 1276 1277 1278 1279 1280 1281
  term_initted = 1;
}

/* Return nonzero if safe to use tabs in output.
   At the time this is called, init_sys_modes has not been done yet.  */
   
tabs_safe_p ()
{
Jim Blandy's avatar
Jim Blandy committed
1282 1283 1284 1285
  struct emacs_tty tty;

  EMACS_GET_TTY (input_fd, &tty);
  return EMACS_TTY_TABS_OK (&tty);
Jim Blandy's avatar
Jim Blandy committed
1286 1287 1288 1289 1290 1291
}

/* Get terminal size from system.
   Store number of lines into *heightp and width into *widthp.
   If zero or a negative number is stored, the value is not valid.  */

Jim Blandy's avatar
Jim Blandy committed
1292
get_frame_size (widthp, heightp)
Jim Blandy's avatar
Jim Blandy committed
1293 1294 1295 1296
     int *widthp, *heightp;
{

#ifdef TIOCGWINSZ
Jim Blandy's avatar
Jim Blandy committed
1297 1298

  /* BSD-style.  */
Jim Blandy's avatar
Jim Blandy committed
1299
  struct winsize size;
Jim Blandy's avatar
Jim Blandy committed
1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323

  if (ioctl (input_fd, TIOCGWINSZ, &size) == -1)
    *widthp = *heightp = 0;
  else
    {
      *widthp = size.ws_col;
      *heightp = size.ws_row;
    }

#else
#ifdef TIOCGSIZE

  /* SunOS - style.  */
  struct ttysize size;  

  if (ioctl (input_fd, TIOCGSIZE, &size) == -1)
    *widthp = *heightp = 0;
  else
    {
      *widthp = size.ts_cols;
      *heightp = size.ts_lines;
    }

#else
Jim Blandy's avatar
Jim Blandy committed
1324
#ifdef VMS
Jim Blandy's avatar
Jim Blandy committed
1325 1326 1327 1328

  struct sensemode tty;
  
  SYS$QIOW (0, input_fd, IO$_SENSEMODE, &tty, 0, 0,
Jim Blandy's avatar
Jim Blandy committed
1329 1330 1331
	    &tty.class, 12, 0, 0, 0, 0);
  *widthp = tty.scr_wid;
  *heightp = tty.scr_len;
Jim Blandy's avatar
Jim Blandy committed
1332

Jim Blandy's avatar
Jim Blandy committed
1333
#else /* system doesn't know size */
Jim Blandy's avatar
Jim Blandy committed
1334

Jim Blandy's avatar
Jim Blandy committed
1335 1336
  *widthp = 0;
  *heightp = 0;
Jim Blandy's avatar
Jim Blandy committed
1337 1338 1339 1340

#endif /* not VMS */
#endif /* not SunOS-style */
#endif /* not BSD-style */
Jim Blandy's avatar
Jim Blandy committed
1341
}
Jim Blandy's avatar
Jim Blandy committed
1342

Jim Blandy's avatar
Jim Blandy committed
1343

Jim Blandy's avatar
Jim Blandy committed
1344
/* Prepare the terminal for exiting Emacs; move the cursor to the
Jim Blandy's avatar
Jim Blandy committed
1345
   bottom of the frame, turn off interrupt-driven I/O, etc.  */
Jim Blandy's avatar
Jim Blandy committed
1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356
reset_sys_modes ()
{
  if (noninteractive)
    {
      fflush (stdout);
      return;
    }
  if (!term_initted)
    return;
  if (read_socket_hook || !EQ (Vwindow_system, Qnil))
    return;
Jim Blandy's avatar
Jim Blandy committed
1357 1358
  cursor_to (FRAME_HEIGHT (selected_frame) - 1, 0);
  clear_end_of_line (FRAME_WIDTH (selected_frame));
Jim Blandy's avatar
Jim Blandy committed
1359
  /* clear_end_of_line may move the cursor */
Jim Blandy's avatar
Jim Blandy committed
1360
  cursor_to (FRAME_HEIGHT (selected_frame) - 1, 0);
Jim Blandy's avatar
Jim Blandy committed
1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379
#ifdef IBMR2AIX
  {
    /* HFT devices normally use ^J as a LF/CR.  We forced it to 
       do the LF only.  Now, we need to reset it. */
    struct termio tty;

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

  reset_terminal_modes ();
  fflush (stdout);
#ifdef BSD
#ifndef BSD4_1
  /* Avoid possible loss of output when changing terminal modes.  */
  fsync (fileno (stdout));
#endif
#endif
Jim Blandy's avatar
Jim Blandy committed
1380

Jim Blandy's avatar
Jim Blandy committed
1381
#ifdef F_SETFL
1382
#ifndef F_SETOWN_BUG
1383
#ifdef F_SETOWN		/* F_SETFL does not imply existence of F_SETOWN */
Jim Blandy's avatar
Jim Blandy committed
1384 1385 1386 1387 1388 1389
  if (interrupt_input)
    {
      reset_sigio ();
      fcntl (0, F_SETOWN, old_fcntl_owner);
    }
#endif /* F_SETOWN */
1390
#endif /* F_SETOWN_BUG */
Jim Blandy's avatar
Jim Blandy committed
1391 1392 1393 1394 1395
#endif /* F_SETFL */
#ifdef BSD4_1
  if (interrupt_input)
    reset_sigio ();
#endif /* BSD4_1 */
Jim Blandy's avatar
Jim Blandy committed
1396

1397
  while (EMACS_SET_TTY (input_fd, &old_tty, 0) < 0 && errno == EINTR)
Jim Blandy's avatar
Jim Blandy committed