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 22


Dave Love's avatar
Dave Love committed
23
#include "config.h"
Jim Blandy's avatar
Jim Blandy committed
24 25
#include <signal.h>
#include <setjmp.h>
26 27 28
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
Jim Blandy's avatar
Jim Blandy committed
29
#include "lisp.h"
30 31 32
/* 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
33 34 35 36
#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 */
37
extern long int random P_ ((void));
Dave Love's avatar
Dave Love committed
38
#endif
39 40 41
#if 0 /* Don't prototype srandom; it takes an unsigned argument on
	 some systems, and an unsigned long on others, like FreeBSD
	 4.1.  */
42 43
extern void srandom P_ ((unsigned int));
#endif
44
#endif
45

46
#include "blockinput.h"
Jim Blandy's avatar
Jim Blandy committed
47 48
#undef NULL

49
#ifdef macintosh
50 51 52 53 54
/* 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>

55 56 57 58 59 60
#ifndef subprocesses
/* Nonzero means delete a process right away if it exits (process.c).  */
static int delete_exited_processes;
#endif
#endif  /* macintosh */

Jim Blandy's avatar
Jim Blandy committed
61 62
#define min(x,y) ((x) > (y) ? (y) : (x))

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

Jim Blandy's avatar
Jim Blandy committed
79 80 81 82 83
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>

84 85 86 87 88
/* Get _POSIX_VDISABLE, if it is available.  */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

89 90 91 92
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

93
#ifdef HAVE_SETPGID
94
#if !defined (USG) || defined (BSD_PGRPS)
95
#undef setpgrp
96 97
#define setpgrp setpgid
#endif
98
#endif
99

100 101 102 103 104
/* Get SI_SRPC_DOMAIN, if it is available.  */
#ifdef HAVE_SYS_SYSTEMINFO_H
#include <sys/systeminfo.h>
#endif

105 106 107 108 109
#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>
110 111 112 113 114

#if __DJGPP__ > 1
extern int etext;
extern unsigned start __asm__ ("start");
#endif
115 116
#endif

117
#ifndef USE_CRT_DLL
118
#ifndef errno
Jim Blandy's avatar
Jim Blandy committed
119
extern int errno;
120
#endif
121
#endif
Jim Blandy's avatar
Jim Blandy committed
122

123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142
#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
143
#define MAXIOSIZE (32 * PAGESIZE) /* Don't I/O more than 32 blocks at a time */
144 145 146
#endif /* VMS */

#ifndef BSD4_1
147
#ifdef BSD_SYSTEM /* avoid writing defined (BSD_SYSTEM) || defined (USG)
148 149 150 151 152 153 154 155 156
	      because the vms compiler doesn't grok `defined' */
#include <fcntl.h>
#endif
#ifdef USG
#ifndef USG5
#include <fcntl.h>
#endif
#endif
#endif /* not 4.1 bsd */
Jim Blandy's avatar
Jim Blandy committed
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
Richard M. Stallman's avatar
Richard M. Stallman committed
250 251
#if defined (HAVE_TERMIOS_H) && defined (LINUX)
#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
Jim Blandy's avatar
Jim Blandy committed
330 331 332
stuff_char (c)
     char c;
{
333 334 335
  if (read_socket_hook)
    return;

Jim Blandy's avatar
Jim Blandy committed
336 337
/* Should perhaps error if in batch mode */
#ifdef TIOCSTI
338
  ioctl (input_fd, TIOCSTI, &c);
Jim Blandy's avatar
Jim Blandy committed
339
#else /* no TIOCSTI */
340
  error ("Cannot stuff terminal input characters in this version of Unix");
Jim Blandy's avatar
Jim Blandy committed
341 342 343 344
#endif /* no TIOCSTI */
}

#endif /* SIGTSTP */
345

346
void
Jim Blandy's avatar
Jim Blandy committed
347 348 349
init_baud_rate ()
{
  if (noninteractive)
Gerd Moellmann's avatar
Gerd Moellmann committed
350
    emacs_ospeed = 0;
Jim Blandy's avatar
Jim Blandy committed
351 352
  else
    {
353 354 355
#ifdef INIT_BAUD_RATE
      INIT_BAUD_RATE ();
#else
356
#ifdef DOS_NT
Gerd Moellmann's avatar
Gerd Moellmann committed
357
    emacs_ospeed = 15;
358
#else  /* not DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
359
#ifdef VMS
Jim Blandy's avatar
Jim Blandy committed
360 361 362
      struct sensemode sg;

      SYS$QIOW (0, input_fd, IO$_SENSEMODE, &sg, 0, 0,
Jim Blandy's avatar
Jim Blandy committed
363
		&sg.class, 12, 0, 0, 0, 0 );
Gerd Moellmann's avatar
Gerd Moellmann committed
364
      emacs_ospeed = sg.xmit_baud;
Jim Blandy's avatar
Jim Blandy committed
365
#else /* not VMS */
366 367
#ifdef HAVE_TERMIOS
      struct termios sg;
Jim Blandy's avatar
Jim Blandy committed
368

369
      sg.c_cflag = B9600;
370
      tcgetattr (input_fd, &sg);
Gerd Moellmann's avatar
Gerd Moellmann committed
371
      emacs_ospeed = cfgetospeed (&sg);
372
#if defined (USE_GETOBAUD) && defined (getobaud)
373
      /* m88k-motorola-sysv3 needs this (ghazi@noc.rutgers.edu) 9/1/94. */
Gerd Moellmann's avatar
Gerd Moellmann committed
374 375
      if (emacs_ospeed == 0)
        emacs_ospeed = getobaud (sg.c_cflag);
376
#endif
377 378 379
#else /* neither VMS nor TERMIOS */
#ifdef HAVE_TERMIO
      struct termio sg;
Jim Blandy's avatar
Jim Blandy committed
380

381
      sg.c_cflag = B9600;
382
#ifdef HAVE_TCATTR
383
      tcgetattr (input_fd, &sg);
384
#else
385
      ioctl (input_fd, TCGETA, &sg);
386
#endif
Gerd Moellmann's avatar
Gerd Moellmann committed
387
      emacs_ospeed = sg.c_cflag & CBAUD;
388
#else /* neither VMS nor TERMIOS nor TERMIO */
Jim Blandy's avatar
Jim Blandy committed
389 390 391
      struct sgttyb sg;
      
      sg.sg_ospeed = B9600;
392
      if (ioctl (input_fd, TIOCGETP, &sg) < 0)
393
	abort ();
Gerd Moellmann's avatar
Gerd Moellmann committed
394
      emacs_ospeed = sg.sg_ospeed;
Jim Blandy's avatar
Jim Blandy committed
395
#endif /* not HAVE_TERMIO */
396
#endif /* not HAVE_TERMIOS */
Jim Blandy's avatar
Jim Blandy committed
397
#endif /* not VMS */
398
#endif /* not DOS_NT */
399
#endif /* not INIT_BAUD_RATE */
Jim Blandy's avatar
Jim Blandy committed
400 401
    }
   
Gerd Moellmann's avatar
Gerd Moellmann committed
402 403
  baud_rate = (emacs_ospeed < sizeof baud_convert / sizeof baud_convert[0]
	       ? baud_convert[emacs_ospeed] : 9600);
Jim Blandy's avatar
Jim Blandy committed
404 405 406 407 408
  if (baud_rate == 0)
    baud_rate = 1200;
}

/*ARGSUSED*/
Andreas Schwab's avatar
Andreas Schwab committed
409
void
Jim Blandy's avatar
Jim Blandy committed
410 411 412 413 414 415 416 417
set_exclusive_use (fd)
     int fd;
{
#ifdef FIOCLEX
  ioctl (fd, FIOCLEX, 0);
#endif
  /* Ok to do nothing if this feature does not exist */
}
418

Jim Blandy's avatar
Jim Blandy committed
419 420 421 422
#ifndef subprocesses

wait_without_blocking ()
{
423
#ifdef BSD_SYSTEM
Jim Blandy's avatar
Jim Blandy committed
424 425 426 427 428 429 430 431 432 433
  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
434
			 (at least for bsd).  */
Jim Blandy's avatar
Jim Blandy committed
435 436 437 438 439 440 441 442

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) */

443
void
Jim Blandy's avatar
Jim Blandy committed
444 445 446 447 448 449 450 451 452
wait_for_termination (pid)
     int pid;
{
  while (1)
    {
#ifdef subprocesses
#ifdef VMS
      int status;

453
      status = SYS$FORCEX (&pid, 0, 0);
Jim Blandy's avatar
Jim Blandy committed
454 455
      break;
#else /* not VMS */
456
#if defined (BSD_SYSTEM) || (defined (HPUX) && !defined (HPUX_5))
457 458 459 460 461 462 463 464 465
      /* 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))
466
	{
467 468 469 470 471 472 473 474
	  sigsetmask (SIGEMPTYMASK);
	  kill (getpid (), SIGCHLD);
	  break;
	}
      if (wait_debugging)
	sleep (1);
      else
	sigpause (SIGEMPTYMASK);
475
#else /* not BSD_SYSTEM, and not HPUX version >= 6 */
476
#if defined (UNIPLUS)
477 478 479
      if (0 > kill (pid, 0))
	break;
      wait (0);
480
#else /* neither BSD_SYSTEM nor UNIPLUS: random sysV */
481
#ifdef POSIX_SIGNALS    /* would this work for LINUX as well? */
482 483 484 485 486 487
      sigblock (sigmask (SIGCHLD));
      if (0 > kill (pid, 0))
	{
	  sigunblock (sigmask (SIGCHLD));
	  break;
	}
488 489 490 491 492

      /* FIXME: Since sigpause is not POSIX and its use is deprecated,
	 this should probably be `sigsuspend (&empty_mask)', which is
	 POSIX.  I'm not making that change right away because the
	 release is nearing.  2001-09-20 gerd.  */
493
      sigpause (SIGEMPTYMASK);
494
#else /* not POSIX_SIGNALS */
495 496 497 498 499 500 501 502 503
#ifdef HAVE_SYSV_SIGPAUSE
      sighold (SIGCHLD);
      if (0 > kill (pid, 0))
	{
	  sigrelse (SIGCHLD);
	  break;
	}
      sigpause (SIGCHLD);
#else /* not HAVE_SYSV_SIGPAUSE */
504 505 506 507
#ifdef WINDOWSNT
      wait (0);
      break;
#else /* not WINDOWSNT */
508
      if (0 > kill (pid, 0))
Jim Blandy's avatar
Jim Blandy committed
509
	break;
510 511 512 513
      /* Using sleep instead of pause avoids timing error.
	 If the inferior dies just before the sleep,
	 we lose just one second.  */
      sleep (1);
514
#endif /* not WINDOWSNT */
515
#endif /* not HAVE_SYSV_SIGPAUSE */
516
#endif /* not POSIX_SIGNALS */
517
#endif /* not UNIPLUS */
518
#endif /* not BSD_SYSTEM, and not HPUX version >= 6 */
Jim Blandy's avatar
Jim Blandy committed
519 520
#endif /* not VMS */
#else /* not subprocesses */
521 522 523
#if __DJGPP__ > 1
      break;
#else /* not __DJGPP__ > 1 */
Jim Blandy's avatar
Jim Blandy committed
524 525 526 527 528 529 530 531 532 533
#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 */
534
#endif /* not __DJGPP__ > 1*/
Jim Blandy's avatar
Jim Blandy committed
535 536 537 538 539 540 541 542 543 544 545
#endif /* not subprocesses */
    }
}

#ifdef subprocesses

/*
 *	flush any pending output
 *      (may flush input as well; it does not matter the way we use it)
 */
 
546
void
Jim Blandy's avatar
Jim Blandy committed
547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566
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
}
567

Jim Blandy's avatar
Jim Blandy committed
568 569 570 571 572 573
#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.  */

574
void
Jim Blandy's avatar
Jim Blandy committed
575 576 577
child_setup_tty (out)
     int out;
{
578
#ifndef DOS_NT
Jim Blandy's avatar
Jim Blandy committed
579 580 581
  struct emacs_tty s;

  EMACS_GET_TTY (out, &s);
Jim Blandy's avatar
Jim Blandy committed
582

583
#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
Jim Blandy's avatar
Jim Blandy committed
584 585
  s.main.c_oflag |= OPOST;	/* Enable output postprocessing */
  s.main.c_oflag &= ~ONLCR;	/* Disable map of NL to CR-NL on output */
586
#ifdef NLDLY
Jim Blandy's avatar
Jim Blandy committed
587 588
  s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
  				/* No output delays */
589
#endif
Jim Blandy's avatar
Jim Blandy committed
590 591
  s.main.c_lflag &= ~ECHO;	/* Disable echo */
  s.main.c_lflag |= ISIG;	/* Enable signals */
592 593 594
#ifdef IUCLC
  s.main.c_iflag &= ~IUCLC;	/* Disable downcasing on input.  */
#endif
595 596 597
#ifdef ISTRIP
  s.main.c_iflag &= ~ISTRIP;	/* don't strip 8th bit on input */
#endif
598
#ifdef OLCUC
599 600
  s.main.c_oflag &= ~OLCUC;	/* Disable upcasing on output.  */
#endif
601
  s.main.c_oflag &= ~TAB3;	/* Disable tab expansion */
602
  s.main.c_cflag = (s.main.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
Jim Blandy's avatar
Jim Blandy committed
603
#if 0
604
  /* Said to be unnecessary:  */
Jim Blandy's avatar
Jim Blandy committed
605 606 607 608 609 610
  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 */
611 612
  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
613

Jim Blandy's avatar
Jim Blandy committed
614
#ifdef HPUX
Jim Blandy's avatar
Jim Blandy committed
615
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
616
#endif /* HPUX */
Jim Blandy's avatar
Jim Blandy committed
617

Jim Blandy's avatar
Jim Blandy committed
618 619 620
#ifdef AIX
/* AIX enhanced edit loses NULs, so disable it */
#ifndef IBMR2AIX
Jim Blandy's avatar
Jim Blandy committed
621 622
  s.main.c_line = 0;
  s.main.c_iflag &= ~ASCEDIT;
Jim Blandy's avatar
Jim Blandy committed
623 624 625
#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
626 627 628 629
  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;
630 631 632 633 634 635 636 637 638 639 640
#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
641
  s.main.c_lflag &= ~ISIG;
642 643
#endif /* no TIOCGPGRP or no TIOCGLTC or no TIOCGETC */
  s.main.c_cc[VEOL] = 0377;
Jim Blandy's avatar
Jim Blandy committed
644
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
645 646 647
#endif /* AIX */

#else /* not HAVE_TERMIO */
Jim Blandy's avatar
Jim Blandy committed
648 649 650

  s.main.sg_flags &= ~(ECHO | CRMOD | ANYP | ALLDELAY | RAW | LCASE
		       | CBREAK | TANDEM);
651
  s.main.sg_flags |= LPASS8;
Jim Blandy's avatar
Jim Blandy committed
652 653
  s.main.sg_erase = 0377;
  s.main.sg_kill = 0377;
654
  s.lmode = LLITOUT | s.lmode;        /* Don't strip 8th bit */
Jim Blandy's avatar
Jim Blandy committed
655

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

Jim Blandy's avatar
Jim Blandy committed
658
  EMACS_SET_TTY (out, &s, 0);
Jim Blandy's avatar
Jim Blandy committed
659 660 661 662 663 664 665 666 667 668 669

#ifdef BSD4_1
  if (interrupt_input)
    reset_sigio ();
#endif /* BSD4_1 */
#ifdef RTU
  {
    int zero = 0;
    ioctl (out, FIOASYNC, &zero);
  }
#endif /* RTU */
670
#endif /* not DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
671 672 673 674
}
#endif /* not VMS */

#endif /* subprocesses */
675

Jim Blandy's avatar
Jim Blandy committed
676 677 678 679
/* Record a signal code and the handler for it.  */
struct save_signal
{
  int code;
Andreas Schwab's avatar
Andreas Schwab committed
680
  SIGTYPE (*handler) P_ ((int));
Jim Blandy's avatar
Jim Blandy committed
681 682
};

Andreas Schwab's avatar
Andreas Schwab committed
683 684 685
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
686 687
/* Suspend the Emacs process; give terminal to its superior.  */

688
void
Jim Blandy's avatar
Jim Blandy committed
689 690 691
sys_suspend ()
{
#ifdef VMS
692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709
  /* "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 ();

710
  xfree (fpid_string);		/* On VMS, this was malloc'd */
Jim Blandy's avatar
Jim Blandy committed
711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726

  if (parent_id && parent_id != 0xffffffff)
    {
      SIGTYPE (*oldsig)() = (int) signal (SIGINT, SIG_IGN);
      int status = LIB$ATTACH (&parent_id) & 1;
      signal (SIGINT, oldsig);
      return status;
    }
  else
    {
      struct {
	int	l;
	char	*a;
      } d_prompt;
      d_prompt.l = sizeof ("Emacs: ");		/* Our special prompt */
      d_prompt.a = "Emacs: ";			/* Just a reminder */
727
      LIB$SPAWN (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, &d_prompt, 0);
Jim Blandy's avatar
Jim Blandy committed
728 729 730 731
      return 1;
    }
  return -1;
#else
732
#if defined (SIGTSTP) && !defined (MSDOS)
Jim Blandy's avatar
Jim Blandy committed
733

734
  {
735
    int pgrp = EMACS_GETPGRP (0);
736 737
    EMACS_KILLPG (pgrp, SIGTSTP);
  }
Jim Blandy's avatar
Jim Blandy committed
738 739 740 741 742 743 744 745 746 747 748

#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.  */
749 750 751 752 753 754 755 756 757
  sys_subshell ();

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

/* Fork a subshell.  */

758
#ifndef macintosh
759
void
760 761 762
sys_subshell ()
{
#ifndef VMS
763
#ifdef DOS_NT	/* Demacs 1.1.2 91/10/20 Manabu Higashida */
764 765 766
  int st;
  char oldwd[MAXPATHLEN+1]; /* Fixed length is safe on MSDOS.  */
#endif
767
  int pid;
Jim Blandy's avatar
Jim Blandy committed
768
  struct save_signal saved_handlers[5];
769 770 771
  Lisp_Object dir;
  unsigned char *str = 0;
  int len;
Jim Blandy's avatar
Jim Blandy committed
772 773 774 775 776 777 778 779 780 781 782

  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

783 784 785 786
  /* Mentioning current_buffer->buffer would mean including buffer.h,
     which somehow wedges the hp compiler.  So instead...  */

  dir = intern ("default-directory");
787
  if (NILP (Fboundp (dir)))
788 789
    goto xyzzy;
  dir = Fsymbol_value (dir);
790
  if (!STRINGP (dir))
791 792 793 794 795 796 797 798 799 800
    goto xyzzy;

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

801
#ifdef DOS_NT
802
  pid = 0;
803 804 805 806
#if __DJGPP__ > 1
  save_signal_handlers (saved_handlers);
  synch_process_alive = 1;
#endif /* __DJGPP__ > 1 */
807
#else  
808
  pid = vfork ();
Jim Blandy's avatar
Jim Blandy committed
809 810
  if (pid == -1)
    error ("Can't spawn subshell");
811 812
#endif

Jim Blandy's avatar
Jim Blandy committed
813 814
  if (pid == 0)
    {
815
      char *sh = 0;
Jim Blandy's avatar
Jim Blandy committed
816

817
#ifdef DOS_NT    /* MW, Aug 1993 */
818
      getwd (oldwd);
819 820
      if (sh == 0)
	sh = (char *) egetenv ("SUSPEND");	/* KFS, 1994-12-14 */
821
#endif
822 823
      if (sh == 0)
	sh = (char *) egetenv ("SHELL");
Jim Blandy's avatar
Jim Blandy committed
824 825
      if (sh == 0)
	sh = "sh";
826

Jim Blandy's avatar
Jim Blandy committed
827
      /* Use our buffer's default directory for the subshell.  */
828
      if (str)
829
	chdir ((char *) str);
830

Jim Blandy's avatar
Jim Blandy committed
831 832 833
#ifdef subprocesses
      close_process_descs ();	/* Close Emacs's pipes/ptys */
#endif
834

835
#ifdef SET_EMACS_PRIORITY
836 837 838
      {
	extern int emacs_priority;

839
	if (emacs_priority < 0)
840 841 842 843
	  nice (-emacs_priority);
      }
#endif

844
#ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida */
845 846
      st = system (sh);
      chdir (oldwd);
847
#if 0	/* This is also reported if last command executed in subshell failed, KFS */
848
      if (st)
849
	report_file_error ("Can't execute subshell", Fcons (build_string (sh), Qnil));
850
#endif
851
#else /* not MSDOS */
852 853 854
#ifdef  WINDOWSNT
      /* Waits for process completion */
      pid = _spawnlp (_P_WAIT, sh, sh, NULL);
855
      chdir (oldwd);
856 857 858
      if (pid == -1)
	write (1, "Can't execute subshell", 22);
#else   /* not WINDOWSNT */
Jim Blandy's avatar
Jim Blandy committed
859 860 861
      execlp (sh, sh, 0);
      write (1, "Can't execute subshell", 22);
      _exit (1);
862
#endif  /* not WINDOWSNT */
863
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
864 865
    }

866 867
  /* Do this now if we did not do it before.  */
#if !defined (MSDOS) || __DJGPP__ == 1
Jim Blandy's avatar
Jim Blandy committed
868
  save_signal_handlers (saved_handlers);
869
  synch_process_alive = 1;
870 871
#endif

872
#ifndef DOS_NT
Jim Blandy's avatar
Jim Blandy committed
873
  wait_for_termination (pid);
874
#endif
Jim Blandy's avatar
Jim Blandy committed
875
  restore_signal_handlers (saved_handlers);
876
  synch_process_alive = 0;
877
#endif /* !VMS */
Jim Blandy's avatar
Jim Blandy committed
878
}
879
#endif /* !macintosh */
Jim Blandy's avatar
Jim Blandy committed
880

Andreas Schwab's avatar
Andreas Schwab committed
881
static void
Jim Blandy's avatar
Jim Blandy committed
882 883 884 885 886
save_signal_handlers (saved_handlers)
     struct save_signal *saved_handlers;
{
  while (saved_handlers->code)
    {
Joseph Arceneaux's avatar
Joseph Arceneaux committed
887
      saved_handlers->handler
Andreas Schwab's avatar
Andreas Schwab committed
888
	= (SIGTYPE (*) P_ ((int))) signal (saved_handlers->code, SIG_IGN);
Jim Blandy's avatar
Jim Blandy committed
889 890 891 892
      saved_handlers++;
    }
}

Andreas Schwab's avatar
Andreas Schwab committed
893
static void
Jim Blandy's avatar
Jim Blandy committed
894 895 896 897 898 899 900 901 902 903 904 905 906 907
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;

908
void
909 910
init_sigio (fd)
     int fd;
Jim Blandy's avatar
Jim Blandy committed
911 912
{
#ifdef FASYNC
913 914
  old_fcntl_flags = fcntl (fd, F_GETFL, 0) & ~FASYNC;
  fcntl (fd, F_SETFL, old_fcntl_flags | FASYNC);
Jim Blandy's avatar
Jim Blandy committed
915
#endif
916
  interrupts_deferred = 0;
Jim Blandy's avatar
Jim Blandy committed
917 918
}

Andreas Schwab's avatar
Andreas Schwab committed
919
void
Jim Blandy's avatar
Jim Blandy committed
920 921 922 923 924
reset_sigio ()
{
  unrequest_sigio ();
}

925
#ifdef FASYNC		/* F_SETFL does not imply existence of FASYNC */
Jim Blandy's avatar
Jim Blandy committed
926

927
void
Jim Blandy's avatar
Jim Blandy committed
928 929
request_sigio ()
{
930 931 932
  if (read_socket_hook)
    return;

Jim Blandy's avatar
Jim Blandy committed
933
#ifdef SIGWINCH
Jim Blandy's avatar
Jim Blandy committed
934
  sigunblock (sigmask (SIGWINCH));
Jim Blandy's avatar
Jim Blandy committed
935
#endif
936
  fcntl (input_fd, F_SETFL, old_fcntl_flags | FASYNC);
Jim Blandy's avatar
Jim Blandy committed
937 938 939 940

  interrupts_deferred = 0;
}

941
void
Jim Blandy's avatar
Jim Blandy committed
942 943
unrequest_sigio ()
{
944 945 946
  if (read_socket_hook)
    return;

Jim Blandy's avatar
Jim Blandy committed
947
#ifdef SIGWINCH
Jim Blandy's avatar
Jim Blandy committed
948
  sigblock (sigmask (SIGWINCH));
Jim Blandy's avatar
Jim Blandy committed
949
#endif
950
  fcntl (input_fd, F_SETFL, old_fcntl_flags);
Jim Blandy's avatar
Jim Blandy committed
951 952 953 954 955 956
  interrupts_deferred = 1;
}

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

957
void
Jim Blandy's avatar
Jim Blandy committed
958 959 960
request_sigio ()
{
  int on = 1;
961 962 963 964

  if (read_socket_hook)
    return;

965
  ioctl (input_fd, FIOASYNC, &on);
Jim Blandy's avatar
Jim Blandy committed
966 967 968
  interrupts_deferred = 0;
}

969
void
Jim Blandy's avatar
Jim Blandy committed
970 971 972 973
unrequest_sigio ()
{
  int off = 0;

974 975 976
  if (read_socket_hook)
    return;

977
  ioctl (input_fd, FIOASYNC, &off);
Jim Blandy's avatar
Jim Blandy committed
978 979 980 981 982
  interrupts_deferred = 1;
}

#else /* not FASYNC, not STRIDE */
 
983 984 985 986