sysdep.c 122 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Interfaces to system-dependent kernel and library entries.
Gerd Moellmann's avatar
Gerd Moellmann committed
2
   Copyright (C) 1985, 86,87,88,93,94,95, 1999, 2000, 2001
Gerd Moellmann's avatar
Gerd Moellmann committed
3
   Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
4 5 6 7 8

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
9
the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
10 11 12 13 14 15 16 17 18
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
19 20
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */
Jim Blandy's avatar
Jim Blandy committed
21

Pavel Janík's avatar
Pavel Janík committed
22 23 24
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
Jim Blandy's avatar
Jim Blandy committed
25 26 27

#include <signal.h>
#include <setjmp.h>
28 29 30
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
Jim Blandy's avatar
Jim Blandy committed
31
#include "lisp.h"
32 33 34
/* Including stdlib.h isn't necessarily enough to get srandom
   declared, e.g. without __USE_XOPEN_EXTENDED with glibc 2.  */
#ifdef HAVE_RANDOM
Dave Love's avatar
Dave Love committed
35 36 37 38
#if 0 /* It turns out that defining _OSF_SOURCE in osf5-0.h gets
	 random prototyped as returning `int'.  It looks to me as
	 though the best way to DTRT is to prefer the rand48 functions
	 (per libc.info).  -- fx */
39
extern long int random P_ ((void));
Dave Love's avatar
Dave Love committed
40
#endif
41 42 43
#if 0 /* Don't prototype srandom; it takes an unsigned argument on
	 some systems, and an unsigned long on others, like FreeBSD
	 4.1.  */
44 45
extern void srandom P_ ((unsigned int));
#endif
46
#endif
47

48
#include "blockinput.h"
Jim Blandy's avatar
Jim Blandy committed
49 50
#undef NULL

51
#ifdef MAC_OS8
52 53 54 55 56
/* It is essential to include stdlib.h so that this file picks up
   the correct definitions of rand, srand, and RAND_MAX.
   Otherwise random numbers will not work correctly.  */
#include <stdlib.h>

57 58 59 60
#ifndef subprocesses
/* Nonzero means delete a process right away if it exits (process.c).  */
static int delete_exited_processes;
#endif
61
#endif  /* MAC_OS8 */
62

63
#ifdef WINDOWSNT
64 65
#define read sys_read
#define write sys_write
66
#include <windows.h>
67 68 69
#ifndef NULL
#define NULL 0
#endif
70 71
#endif /* not WINDOWSNT */

72 73 74 75
#ifdef HAVE_CARBON
#define read sys_read
#endif

76 77 78 79 80 81 82
/* Does anyone other than VMS need this? */
#ifndef fwrite
#define sys_fwrite fwrite
#else
#undef fwrite
#endif

Jim Blandy's avatar
Jim Blandy committed
83 84 85 86 87
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>

88 89 90 91 92
/* Get _POSIX_VDISABLE, if it is available.  */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

93 94 95 96
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

97
#ifdef HAVE_SETPGID
98
#if !defined (USG) || defined (BSD_PGRPS)
99
#undef setpgrp
100 101
#define setpgrp setpgid
#endif
102
#endif
103

104 105 106 107 108
/* Get SI_SRPC_DOMAIN, if it is available.  */
#ifdef HAVE_SYS_SYSTEMINFO_H
#include <sys/systeminfo.h>
#endif

109 110 111 112 113
#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>
114 115 116 117 118

#if __DJGPP__ > 1
extern int etext;
extern unsigned start __asm__ ("start");
#endif
119 120
#endif

121
#ifndef USE_CRT_DLL
122
#ifndef errno
Jim Blandy's avatar
Jim Blandy committed
123
extern int errno;
124
#endif
125
#endif
Jim Blandy's avatar
Jim Blandy committed
126

127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146
#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
147
#define MAXIOSIZE (32 * PAGESIZE) /* Don't I/O more than 32 blocks at a time */
148 149
#endif /* VMS */

150 151 152 153
#ifndef VMS
#include <sys/file.h>
#endif /* not VMS */

154
#ifdef HAVE_FCNTL_H
155 156
#include <fcntl.h>
#endif
Jim Blandy's avatar
Jim Blandy committed
157

158
#ifndef MSDOS
Jim Blandy's avatar
Jim Blandy committed
159
#include <sys/ioctl.h>
160
#endif
161

162
#include "systty.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
163
#include "syswait.h"
Jim Blandy's avatar
Jim Blandy committed
164 165 166

#ifdef BROKEN_TIOCGWINSZ
#undef TIOCGWINSZ
167
#undef TIOCSWINSZ
Jim Blandy's avatar
Jim Blandy committed
168 169
#endif

170
#if defined (USG) || defined (DGUX)
Jim Blandy's avatar
Jim Blandy committed
171 172 173 174
#include <sys/utsname.h>
#ifndef MEMORY_IN_STRING_H
#include <memory.h>
#endif
175
#if defined (TIOCGWINSZ) || defined (ISC4_0)
Jim Blandy's avatar
Jim Blandy committed
176 177 178 179 180 181 182
#ifdef NEED_SIOCTL
#include <sys/sioctl.h>
#endif
#ifdef NEED_PTEM_H
#include <sys/stream.h>
#include <sys/ptem.h>
#endif
183
#endif /* TIOCGWINSZ or ISC4_0 */
Karl Heuer's avatar
Karl Heuer committed
184
#endif /* USG or DGUX */
Jim Blandy's avatar
Jim Blandy committed
185 186 187

extern int quit_char;

188
#include "keyboard.h"
Jim Blandy's avatar
Jim Blandy committed
189
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
190 191 192 193 194 195 196
#include "window.h"
#include "termhooks.h"
#include "termchar.h"
#include "termopts.h"
#include "dispextern.h"
#include "process.h"

197 198 199 200 201 202 203 204
#ifdef WINDOWSNT
#include <direct.h>
/* In process.h which conflicts with the local copy.  */
#define _P_WAIT 0
int _CRTAPI1 _spawnlp (int, const char *, const char *, ...);
int _CRTAPI1 _getpid (void);
#endif

Jim Blandy's avatar
Jim Blandy committed
205 206 207 208
#ifdef NONSYSTEM_DIR_LIBRARY
#include "ndir.h"
#endif /* NONSYSTEM_DIR_LIBRARY */

Jim Blandy's avatar
Jim Blandy committed
209 210
#include "syssignal.h"
#include "systime.h"
211 212 213 214 215 216 217 218 219 220 221 222 223 224
#ifdef HAVE_UTIME_H
#include <utime.h>
#endif

#ifndef HAVE_UTIMES
#ifndef HAVE_STRUCT_UTIMBUF
/* We want to use utime rather than utimes, but we couldn't find the
   structure declaration.  We'll use the traditional one.  */
struct utimbuf {
  long actime;
  long modtime;
};
#endif
#endif
Jim Blandy's avatar
Jim Blandy committed
225

226 227 228 229 230 231 232 233 234
/* 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
235 236 237 238 239 240 241 242 243 244
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

245 246 247
#ifdef HAVE_SPEED_T
#include <termios.h>
#else
248 249
#if defined (HAVE_LIBNCURSES) && ! defined (NCURSES_OSPEED_T)
#else
250
#if defined (HAVE_TERMIOS_H) && defined (GNU_LINUX)
Richard M. Stallman's avatar
Richard M. Stallman committed
251
#include <termios.h>
252
#endif
253
#endif
254
#endif
Jim Blandy's avatar
Jim Blandy committed
255

Gerd Moellmann's avatar
Gerd Moellmann committed
256 257
int emacs_ospeed;

Jim Blandy's avatar
Jim Blandy committed
258
/* The file descriptor for Emacs's input terminal.
259 260 261
   Under Unix, this is normally zero except when using X;
   under VMS, we place the input channel number here.  */
int input_fd;
262 263 264

void croak P_ ((char *));

265 266 267 268
#ifdef AIXHFT
void hft_init ();
void hft_reset ();
#endif
269

270 271 272 273
/* Temporary used by `sigblock' when defined in terms of signprocmask.  */

SIGMASKTYPE sigprocmask_set;

274 275 276 277 278 279 280 281 282 283 284

/* 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
285

286
void
Jim Blandy's avatar
Jim Blandy committed
287 288
discard_tty_input ()
{
289
#ifndef WINDOWSNT
Jim Blandy's avatar
Jim Blandy committed
290
  struct emacs_tty buf;
Jim Blandy's avatar
Jim Blandy committed
291 292 293 294 295 296 297 298 299 300 301

  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
302 303
  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
304 305 306 307 308
  queue_kbd_input ();
#else /* not VMS */
#ifdef APOLLO
  {
    int zero = 0;
309
    ioctl (input_fd, TIOCFLUSH, &zero);
Jim Blandy's avatar
Jim Blandy committed
310 311
  }
#else /* not Apollo */
312
#ifdef MSDOS    /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
313
  while (dos_keyread () != -1)
314
    ;
315
#else /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
316 317
  EMACS_GET_TTY (input_fd, &buf);
  EMACS_SET_TTY (input_fd, &buf, 0);
318
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
319 320
#endif /* not Apollo */
#endif /* not VMS */
321
#endif /* not WINDOWSNT */
Jim Blandy's avatar
Jim Blandy committed
322 323 324 325
}

#ifdef SIGTSTP

326 327 328
/* Arrange for character C to be read as the next input from
   the terminal.  */

Andreas Schwab's avatar
Andreas Schwab committed
329
void
330 331 332
#ifdef PROTOTYPES
stuff_char (char c)
#else
Jim Blandy's avatar
Jim Blandy committed
333 334
stuff_char (c)
     char c;
335
#endif
Jim Blandy's avatar
Jim Blandy committed
336
{
337 338 339
  if (read_socket_hook)
    return;

Jim Blandy's avatar
Jim Blandy committed
340 341
/* Should perhaps error if in batch mode */
#ifdef TIOCSTI
342
  ioctl (input_fd, TIOCSTI, &c);
Jim Blandy's avatar
Jim Blandy committed
343
#else /* no TIOCSTI */
344
  error ("Cannot stuff terminal input characters in this version of Unix");
Jim Blandy's avatar
Jim Blandy committed
345 346 347 348
#endif /* no TIOCSTI */
}

#endif /* SIGTSTP */
349

350
void
Jim Blandy's avatar
Jim Blandy committed
351 352 353
init_baud_rate ()
{
  if (noninteractive)
Gerd Moellmann's avatar
Gerd Moellmann committed
354
    emacs_ospeed = 0;
Jim Blandy's avatar
Jim Blandy committed
355 356
  else
    {
357 358 359
#ifdef INIT_BAUD_RATE
      INIT_BAUD_RATE ();
#else
360
#ifdef DOS_NT
Gerd Moellmann's avatar
Gerd Moellmann committed
361
    emacs_ospeed = 15;
362
#else  /* not DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
363
#ifdef VMS
Jim Blandy's avatar
Jim Blandy committed
364 365 366
      struct sensemode sg;

      SYS$QIOW (0, input_fd, IO$_SENSEMODE, &sg, 0, 0,
Jim Blandy's avatar
Jim Blandy committed
367
		&sg.class, 12, 0, 0, 0, 0 );
Gerd Moellmann's avatar
Gerd Moellmann committed
368
      emacs_ospeed = sg.xmit_baud;
Jim Blandy's avatar
Jim Blandy committed
369
#else /* not VMS */
370 371
#ifdef HAVE_TERMIOS
      struct termios sg;
Jim Blandy's avatar
Jim Blandy committed
372

373
      sg.c_cflag = B9600;
374
      tcgetattr (input_fd, &sg);
Gerd Moellmann's avatar
Gerd Moellmann committed
375
      emacs_ospeed = cfgetospeed (&sg);
376
#if defined (USE_GETOBAUD) && defined (getobaud)
377
      /* m88k-motorola-sysv3 needs this (ghazi@noc.rutgers.edu) 9/1/94. */
Gerd Moellmann's avatar
Gerd Moellmann committed
378 379
      if (emacs_ospeed == 0)
        emacs_ospeed = getobaud (sg.c_cflag);
380
#endif
381 382 383
#else /* neither VMS nor TERMIOS */
#ifdef HAVE_TERMIO
      struct termio sg;
Jim Blandy's avatar
Jim Blandy committed
384

385
      sg.c_cflag = B9600;
386
#ifdef HAVE_TCATTR
387
      tcgetattr (input_fd, &sg);
388
#else
389
      ioctl (input_fd, TCGETA, &sg);
390
#endif
Gerd Moellmann's avatar
Gerd Moellmann committed
391
      emacs_ospeed = sg.c_cflag & CBAUD;
392
#else /* neither VMS nor TERMIOS nor TERMIO */
Jim Blandy's avatar
Jim Blandy committed
393 394 395
      struct sgttyb sg;
      
      sg.sg_ospeed = B9600;
396
      if (ioctl (input_fd, TIOCGETP, &sg) < 0)
397
	abort ();
Gerd Moellmann's avatar
Gerd Moellmann committed
398
      emacs_ospeed = sg.sg_ospeed;
Jim Blandy's avatar
Jim Blandy committed
399
#endif /* not HAVE_TERMIO */
400
#endif /* not HAVE_TERMIOS */
Jim Blandy's avatar
Jim Blandy committed
401
#endif /* not VMS */
402
#endif /* not DOS_NT */
403
#endif /* not INIT_BAUD_RATE */
Jim Blandy's avatar
Jim Blandy committed
404 405
    }
   
Gerd Moellmann's avatar
Gerd Moellmann committed
406 407
  baud_rate = (emacs_ospeed < sizeof baud_convert / sizeof baud_convert[0]
	       ? baud_convert[emacs_ospeed] : 9600);
Jim Blandy's avatar
Jim Blandy committed
408 409 410 411 412
  if (baud_rate == 0)
    baud_rate = 1200;
}

/*ARGSUSED*/
Andreas Schwab's avatar
Andreas Schwab committed
413
void
Jim Blandy's avatar
Jim Blandy committed
414 415 416 417 418 419 420 421
set_exclusive_use (fd)
     int fd;
{
#ifdef FIOCLEX
  ioctl (fd, FIOCLEX, 0);
#endif
  /* Ok to do nothing if this feature does not exist */
}
422

Jim Blandy's avatar
Jim Blandy committed
423 424 425 426
#ifndef subprocesses

wait_without_blocking ()
{
427
#ifdef BSD_SYSTEM
Jim Blandy's avatar
Jim Blandy committed
428 429 430 431 432 433 434 435 436 437
  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
438
			 (at least for bsd).  */
Jim Blandy's avatar
Jim Blandy committed
439 440 441 442 443 444 445 446

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) */

447
void
Jim Blandy's avatar
Jim Blandy committed
448 449 450 451 452 453 454 455 456
wait_for_termination (pid)
     int pid;
{
  while (1)
    {
#ifdef subprocesses
#ifdef VMS
      int status;

457
      status = SYS$FORCEX (&pid, 0, 0);
Jim Blandy's avatar
Jim Blandy committed
458 459
      break;
#else /* not VMS */
460
#if defined (BSD_SYSTEM) || (defined (HPUX) && !defined (HPUX_5))
461 462 463 464 465 466 467 468 469
      /* 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))
470
	{
471 472 473 474 475 476 477 478
	  sigsetmask (SIGEMPTYMASK);
	  kill (getpid (), SIGCHLD);
	  break;
	}
      if (wait_debugging)
	sleep (1);
      else
	sigpause (SIGEMPTYMASK);
479
#else /* not BSD_SYSTEM, and not HPUX version >= 6 */
480
#if defined (UNIPLUS)
481 482 483
      if (0 > kill (pid, 0))
	break;
      wait (0);
484
#else /* neither BSD_SYSTEM nor UNIPLUS: random sysV */
485
#ifdef POSIX_SIGNALS    /* would this work for GNU/Linux as well? */
486
      sigblock (sigmask (SIGCHLD));
487 488
      errno = 0;
      if (kill (pid, 0) == -1 && errno == ESRCH)
489 490 491 492
	{
	  sigunblock (sigmask (SIGCHLD));
	  break;
	}
493

494
      sigsuspend (&empty_mask);
495
#else /* not POSIX_SIGNALS */
496 497 498 499 500 501 502 503 504
#ifdef HAVE_SYSV_SIGPAUSE
      sighold (SIGCHLD);
      if (0 > kill (pid, 0))
	{
	  sigrelse (SIGCHLD);
	  break;
	}
      sigpause (SIGCHLD);
#else /* not HAVE_SYSV_SIGPAUSE */
505 506 507 508
#ifdef WINDOWSNT
      wait (0);
      break;
#else /* not WINDOWSNT */
509
      if (0 > kill (pid, 0))
Jim Blandy's avatar
Jim Blandy committed
510
	break;
511 512 513 514
      /* Using sleep instead of pause avoids timing error.
	 If the inferior dies just before the sleep,
	 we lose just one second.  */
      sleep (1);
515
#endif /* not WINDOWSNT */
516
#endif /* not HAVE_SYSV_SIGPAUSE */
517
#endif /* not POSIX_SIGNALS */
518
#endif /* not UNIPLUS */
519
#endif /* not BSD_SYSTEM, and not HPUX version >= 6 */
Jim Blandy's avatar
Jim Blandy committed
520 521
#endif /* not VMS */
#else /* not subprocesses */
522 523 524
#if __DJGPP__ > 1
      break;
#else /* not __DJGPP__ > 1 */
Jim Blandy's avatar
Jim Blandy committed
525 526 527 528 529 530 531 532 533 534
#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 */
535
#endif /* not __DJGPP__ > 1*/
Jim Blandy's avatar
Jim Blandy committed
536 537 538 539 540 541 542 543 544 545 546
#endif /* not subprocesses */
    }
}

#ifdef subprocesses

/*
 *	flush any pending output
 *      (may flush input as well; it does not matter the way we use it)
 */
 
547
void
Jim Blandy's avatar
Jim Blandy committed
548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567
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
}
568

Jim Blandy's avatar
Jim Blandy committed
569 570 571 572 573 574
#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.  */

575
void
Jim Blandy's avatar
Jim Blandy committed
576 577 578
child_setup_tty (out)
     int out;
{
579
#ifndef DOS_NT
Jim Blandy's avatar
Jim Blandy committed
580 581 582
  struct emacs_tty s;

  EMACS_GET_TTY (out, &s);
Jim Blandy's avatar
Jim Blandy committed
583

584
#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
Jim Blandy's avatar
Jim Blandy committed
585 586
  s.main.c_oflag |= OPOST;	/* Enable output postprocessing */
  s.main.c_oflag &= ~ONLCR;	/* Disable map of NL to CR-NL on output */
587
#ifdef NLDLY
Jim Blandy's avatar
Jim Blandy committed
588 589
  s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
  				/* No output delays */
590
#endif
Jim Blandy's avatar
Jim Blandy committed
591 592
  s.main.c_lflag &= ~ECHO;	/* Disable echo */
  s.main.c_lflag |= ISIG;	/* Enable signals */
Richard M. Stallman's avatar
Richard M. Stallman committed
593
#if 0  /* This causes bugs in (for instance) telnet to certain sites.  */
594 595 596 597 598
  s.main.c_iflag &= ~ICRNL;	/* Disable map of CR to NL on input */
#ifdef INLCR  /* Just being cautious, since I can't check how
		 widespread INLCR is--rms.  */
  s.main.c_iflag &= ~INLCR;	/* Disable map of NL to CR on input */
#endif
599
#endif
600 601 602
#ifdef IUCLC
  s.main.c_iflag &= ~IUCLC;	/* Disable downcasing on input.  */
#endif
603 604 605
#ifdef ISTRIP
  s.main.c_iflag &= ~ISTRIP;	/* don't strip 8th bit on input */
#endif
606
#ifdef OLCUC
607 608
  s.main.c_oflag &= ~OLCUC;	/* Disable upcasing on output.  */
#endif
609
  s.main.c_oflag &= ~TAB3;	/* Disable tab expansion */
610
  s.main.c_cflag = (s.main.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
Jim Blandy's avatar
Jim Blandy committed
611
#if 0
612
  /* Said to be unnecessary:  */
Jim Blandy's avatar
Jim Blandy committed
613 614 615 616 617 618
  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 */
619 620
  s.main.c_cc[VERASE] = CDISABLE;	/* disable erase processing */
  s.main.c_cc[VKILL] = CDISABLE;	/* disable kill processing */
Jim Blandy's avatar
Jim Blandy committed
621

Jim Blandy's avatar
Jim Blandy committed
622
#ifdef HPUX
Jim Blandy's avatar
Jim Blandy committed
623
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
624
#endif /* HPUX */
Jim Blandy's avatar
Jim Blandy committed
625

Jim Blandy's avatar
Jim Blandy committed
626 627 628
#ifdef AIX
/* AIX enhanced edit loses NULs, so disable it */
#ifndef IBMR2AIX
Jim Blandy's avatar
Jim Blandy committed
629 630
  s.main.c_line = 0;
  s.main.c_iflag &= ~ASCEDIT;
Jim Blandy's avatar
Jim Blandy committed
631 632 633
#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
634 635 636 637
  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;
638 639 640 641 642 643 644 645 646 647 648
#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
649
  s.main.c_lflag &= ~ISIG;
650 651
#endif /* no TIOCGPGRP or no TIOCGLTC or no TIOCGETC */
  s.main.c_cc[VEOL] = 0377;
Jim Blandy's avatar
Jim Blandy committed
652
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
653 654 655
#endif /* AIX */

#else /* not HAVE_TERMIO */
Jim Blandy's avatar
Jim Blandy committed
656 657 658

  s.main.sg_flags &= ~(ECHO | CRMOD | ANYP | ALLDELAY | RAW | LCASE
		       | CBREAK | TANDEM);
659
  s.main.sg_flags |= LPASS8;
Jim Blandy's avatar
Jim Blandy committed
660 661
  s.main.sg_erase = 0377;
  s.main.sg_kill = 0377;
662
  s.lmode = LLITOUT | s.lmode;        /* Don't strip 8th bit */
Jim Blandy's avatar
Jim Blandy committed
663

Jim Blandy's avatar
Jim Blandy committed
664 665
#endif /* not HAVE_TERMIO */

Jim Blandy's avatar
Jim Blandy committed
666
  EMACS_SET_TTY (out, &s, 0);
Jim Blandy's avatar
Jim Blandy committed
667 668 669 670 671 672 673 674 675 676 677

#ifdef BSD4_1
  if (interrupt_input)
    reset_sigio ();
#endif /* BSD4_1 */
#ifdef RTU
  {
    int zero = 0;
    ioctl (out, FIOASYNC, &zero);
  }
#endif /* RTU */
678
#endif /* not DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
679 680 681 682
}
#endif /* not VMS */

#endif /* subprocesses */
683

Jim Blandy's avatar
Jim Blandy committed
684 685 686 687
/* Record a signal code and the handler for it.  */
struct save_signal
{
  int code;
Andreas Schwab's avatar
Andreas Schwab committed
688
  SIGTYPE (*handler) P_ ((int));
Jim Blandy's avatar
Jim Blandy committed
689 690
};

Andreas Schwab's avatar
Andreas Schwab committed
691 692 693
static void save_signal_handlers P_ ((struct save_signal *));
static void restore_signal_handlers P_ ((struct save_signal *));

Jim Blandy's avatar
Jim Blandy committed
694 695
/* Suspend the Emacs process; give terminal to its superior.  */

696
void
Jim Blandy's avatar
Jim Blandy committed
697 698 699
sys_suspend ()
{
#ifdef VMS
700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717
  /* "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 ();

718
  xfree (fpid_string);		/* On VMS, this was malloc'd */
Jim Blandy's avatar
Jim Blandy committed
719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734

  if (parent_id && parent_id != 0xffffffff)
    {
      SIGTYPE (*oldsig)() = (int) signal (SIGINT, SIG_IGN);
      int status = LIB$ATTACH (&parent_id) & 1;
      signal (SIGINT, oldsig);
      return status;
    }
  else
    {
      struct {
	int	l;
	char	*a;
      } d_prompt;
      d_prompt.l = sizeof ("Emacs: ");		/* Our special prompt */
      d_prompt.a = "Emacs: ";			/* Just a reminder */
735
      LIB$SPAWN (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, &d_prompt, 0);
Jim Blandy's avatar
Jim Blandy committed
736 737 738 739
      return 1;
    }
  return -1;
#else
740
#if defined (SIGTSTP) && !defined (MSDOS)
Jim Blandy's avatar
Jim Blandy committed
741

742
  {
743
    int pgrp = EMACS_GETPGRP (0);
744 745
    EMACS_KILLPG (pgrp, SIGTSTP);
  }
Jim Blandy's avatar
Jim Blandy committed
746 747 748 749 750 751 752 753 754 755 756

#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.  */
757 758 759 760 761 762 763 764 765
  sys_subshell ();

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

/* Fork a subshell.  */

766
#ifndef MAC_OS8
767
void
768 769 770
sys_subshell ()
{
#ifndef VMS
771
#ifdef DOS_NT	/* Demacs 1.1.2 91/10/20 Manabu Higashida */
772 773 774
  int st;
  char oldwd[MAXPATHLEN+1]; /* Fixed length is safe on MSDOS.  */
#endif
775
  int pid;
Jim Blandy's avatar
Jim Blandy committed
776
  struct save_signal saved_handlers[5];
777 778 779
  Lisp_Object dir;
  unsigned char *str = 0;
  int len;
Jim Blandy's avatar
Jim Blandy committed
780 781 782 783 784 785 786 787 788 789 790

  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

791 792 793 794
  /* Mentioning current_buffer->buffer would mean including buffer.h,
     which somehow wedges the hp compiler.  So instead...  */

  dir = intern ("default-directory");
795
  if (NILP (Fboundp (dir)))
796 797
    goto xyzzy;
  dir = Fsymbol_value (dir);
798
  if (!STRINGP (dir))
799 800 801
    goto xyzzy;

  dir = expand_and_dir_to_file (Funhandled_file_name_directory (dir), Qnil);
802 803 804
  str = (unsigned char *) alloca (SCHARS (dir) + 2);
  len = SCHARS (dir);
  bcopy (SDATA (dir), str, len);
805 806 807 808
  if (str[len - 1] != '/') str[len++] = '/';
  str[len] = 0;
 xyzzy:

809
#ifdef DOS_NT
810
  pid = 0;
811 812 813 814
#if __DJGPP__ > 1
  save_signal_handlers (saved_handlers);
  synch_process_alive = 1;
#endif /* __DJGPP__ > 1 */
815
#else  
816
  pid = vfork ();
Jim Blandy's avatar
Jim Blandy committed
817 818
  if (pid == -1)
    error ("Can't spawn subshell");
819 820
#endif

Jim Blandy's avatar
Jim Blandy committed
821 822
  if (pid == 0)
    {
823
      char *sh = 0;
Jim Blandy's avatar
Jim Blandy committed
824

825
#ifdef DOS_NT    /* MW, Aug 1993 */
826
      getwd (oldwd);
827 828
      if (sh == 0)
	sh = (char *) egetenv ("SUSPEND");	/* KFS, 1994-12-14 */
829
#endif
830 831
      if (sh == 0)
	sh = (char *) egetenv ("SHELL");
Jim Blandy's avatar
Jim Blandy committed
832 833
      if (sh == 0)
	sh = "sh";
834

Jim Blandy's avatar
Jim Blandy committed
835
      /* Use our buffer's default directory for the subshell.  */
836
      if (str)
837
	chdir ((char *) str);
838

Jim Blandy's avatar
Jim Blandy committed
839 840 841
#ifdef subprocesses
      close_process_descs ();	/* Close Emacs's pipes/ptys */
#endif
842

843
#ifdef SET_EMACS_PRIORITY
844
      {
845
	extern EMACS_INT emacs_priority;
846

847
	if (emacs_priority < 0)
848 849 850 851
	  nice (-emacs_priority);
      }
#endif

852
#ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida */
853
      {
854 855
	char *epwd = getenv ("PWD");
	char old_pwd[MAXPATHLEN+1+4];
856 857

	/* If PWD is set, pass it with corrected value.  */
858
	if (epwd)
859
	  {
860
	    strcpy (old_pwd, epwd);
861 862 863 864 865 866
	    if (str[len - 1] == '/')
	      str[len - 1] = '\0';
	    setenv ("PWD", str, 1);
	  }
	st = system (sh);
	chdir (oldwd);
867
	if (epwd)
868 869
	  putenv (old_pwd);	/* restore previous value */
      }
870
#if 0	/* This is also reported if last command executed in subshell failed, KFS */
871
      if (st)
872
	report_file_error ("Can't execute subshell", Fcons (build_string (sh), Qnil));
873
#endif
874
#else /* not MSDOS */
875 876 877
#ifdef  WINDOWSNT
      /* Waits for process completion */
      pid = _spawnlp (_P_WAIT, sh, sh, NULL);
878
      chdir (oldwd);
879 880 881
      if (pid == -1)
	write (1, "Can't execute subshell", 22);
#else   /* not WINDOWSNT */
Jim Blandy's avatar
Jim Blandy committed
882 883 884
      execlp (sh, sh, 0);
      write (1, "Can't execute subshell", 22);
      _exit (1);
885
#endif  /* not WINDOWSNT */
886
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
887 888
    }

889 890
  /* Do this now if we did not do it before.  */
#if !defined (MSDOS) || __DJGPP__ == 1
Jim Blandy's avatar
Jim Blandy committed
891
  save_signal_handlers (saved_handlers);
892
  synch_process_alive = 1;
893 894
#endif

895
#ifndef DOS_NT
Jim Blandy's avatar
Jim Blandy committed
896
  wait_for_termination (pid);
897
#endif
Jim Blandy's avatar
Jim Blandy committed
898
  restore_signal_handlers (saved_handlers);
899
  synch_process_alive = 0;
900
#endif /* !VMS */
Jim Blandy's avatar
Jim Blandy committed
901
}
902
#endif /* !MAC_OS8 */
Jim Blandy's avatar
Jim Blandy committed
903

Andreas Schwab's avatar
Andreas Schwab committed
904
static void
Jim Blandy's avatar
Jim Blandy committed
905 906 907 908 909
save_signal_handlers (saved_handlers)
     struct save_signal *saved_handlers;
{
  while (saved_handlers->code)
    {
Joseph Arceneaux's avatar
Joseph Arceneaux committed
910
      saved_handlers->handler
Andreas Schwab's avatar
Andreas Schwab committed
911
	= (SIGTYPE (*) P_ ((int))) signal (saved_handlers->code, SIG_IGN);
Jim Blandy's avatar
Jim Blandy committed
912 913 914 915
      saved_handlers++;
    }
}

Andreas Schwab's avatar
Andreas Schwab committed
916
static void
Jim Blandy's avatar
Jim Blandy committed
917 918 919 920 921 922 923 924 925 926 927 928 929 930
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;

931
void
932 933
init_sigio (fd)
     int fd;
Jim Blandy's avatar
Jim Blandy committed
934 935
{
#ifdef FASYNC
936 937
  old_fcntl_flags = fcntl (fd, F_GETFL, 0) & ~FASYNC;
  fcntl (fd, F_SETFL, old_fcntl_flags | FASYNC);
Jim Blandy's avatar
Jim Blandy committed
938
#endif
939
  interrupts_deferred = 0;
Jim Blandy's avatar
Jim Blandy committed
940 941
}

Andreas Schwab's avatar
Andreas Schwab committed
942
void
Jim Blandy's avatar
Jim Blandy committed
943 944 945 946 947
reset_sigio ()
{
  unrequest_sigio ();
}

948
#ifdef FASYNC		/* F_SETFL does not imply existence of FASYNC */
Jim Blandy's avatar
Jim Blandy committed
949

950
void
Jim Blandy's avatar
Jim Blandy committed
951 952
request_sigio ()
{
953 954 955
  if (read_socket_hook)
    return;

Jim Blandy's avatar
Jim Blandy committed
956
#ifdef SIGWINCH
Jim Blandy's avatar
Jim Blandy committed
957
  sigunblock (sigmask (SIGWINCH));
Jim Blandy's avatar
Jim Blandy committed
958
#endif
959
  fcntl (input_fd, F_SETFL, old_fcntl_flags | FASYNC);
Jim Blandy's avatar
Jim Blandy committed
960 961 962 963

  interrupts_deferred = 0;
}

964
void
Jim Blandy's avatar
Jim Blandy committed
965 966
unrequest_sigio ()
{
967 968 969
  if (read_socket_hook)
    return;

Jim Blandy's avatar
Jim Blandy committed
970
#ifdef SIGWINCH
Jim Blandy's avatar
Jim Blandy committed
971
  sigblock (sigmask (SIGWINCH));
Jim Blandy's avatar
Jim Blandy committed
972
#endif
973
  fcntl (input_fd, F_SETFL, old_fcntl_flags);
Jim Blandy's avatar
Jim Blandy committed
974 975 976 977 978 979
  interrupts_deferred = 1;
}

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

980
void
Jim Blandy's avatar
Jim Blandy committed
981 982 983
request_sigio ()
{
  int on = 1;
984 985 986 987

  if (read_socket_hook)
    return;

988
  ioctl (input_fd, FIOASYNC, &on);
Jim Blandy's avatar
Jim Blandy committed
989 990 991
  interrupts_deferred = 0;
}

992
void
Jim Blandy's avatar
Jim Blandy committed
993 994 995 996
unrequest_sigio ()
{
  int off = 0;

997 998 999
  if (read_socket_hook)
    return;

1000
  ioctl (input_fd, FIOASYNC, &off);
Jim Blandy's avatar
Jim Blandy committed
1001 1002 1003 1004 1005
  interrupts_deferred = 1;
}

#else /* not FASYNC, not STRIDE */
 
1006 1007 1008 1009
#ifdef _CX_UX

#include <termios.h>

1010
void
1011 1012 1013 1014 1015
request_sigio ()
{
  int on = 1;
  sigset_t st;

1016 1017 1018
  if (read_socket_hook)
    return;

1019 1020
  sigemptyset (&st);
  sigaddset (&st, SIGIO);
1021 1022
  ioctl (input_fd, FIOASYNC, &on);
  interrupts_deferred = 0;
1023
  sigprocmask (SIG_UNBLOCK, &st, (sigset_t *)0);
1024 1025
}

1026
void