sysdep.c 125 KB
Newer Older
Jim Blandy's avatar
Jim Blandy committed
1
/* Interfaces to system-dependent kernel and library entries.
2
   Copyright (C) 1985, 1986, 1987, 1988, 1993, 1994, 1995, 1999, 2000, 2001,
3
                 2002, 2003, 2004, 2005 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
Lute Kamstra's avatar
Lute Kamstra committed
19 20
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, 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

#include <signal.h>
27
#include <stdio.h>
Jim Blandy's avatar
Jim Blandy committed
28
#include <setjmp.h>
29 30 31
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
Jim Blandy's avatar
Jim Blandy committed
32
#include "lisp.h"
33 34 35
/* 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
36 37 38 39
#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 */
40
extern long int random P_ ((void));
Dave Love's avatar
Dave Love committed
41
#endif
42 43 44
#if 0 /* Don't prototype srandom; it takes an unsigned argument on
	 some systems, and an unsigned long on others, like FreeBSD
	 4.1.  */
45 46
extern void srandom P_ ((unsigned int));
#endif
47
#endif
48

49
#include "blockinput.h"
Jim Blandy's avatar
Jim Blandy committed
50 51
#undef NULL

52
#ifdef MAC_OS8
53 54 55 56 57
/* 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>

58 59 60 61
#ifndef subprocesses
/* Nonzero means delete a process right away if it exits (process.c).  */
static int delete_exited_processes;
#endif
62
#endif  /* MAC_OS8 */
63

64
#ifdef WINDOWSNT
65 66
#define read sys_read
#define write sys_write
67
#include <windows.h>
68 69 70
#ifndef NULL
#define NULL 0
#endif
71 72
#endif /* not WINDOWSNT */

73 74 75 76 77 78 79
/* Does anyone other than VMS need this? */
#ifndef fwrite
#define sys_fwrite fwrite
#else
#undef fwrite
#endif

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

84
#ifdef HAVE_SETPGID
85
#if !defined (USG) || defined (BSD_PGRPS)
86
#undef setpgrp
87 88
#define setpgrp setpgid
#endif
89
#endif
90

91 92 93 94 95
/* Get SI_SRPC_DOMAIN, if it is available.  */
#ifdef HAVE_SYS_SYSTEMINFO_H
#include <sys/systeminfo.h>
#endif

96 97 98 99 100
#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>
101 102 103 104 105

#if __DJGPP__ > 1
extern int etext;
extern unsigned start __asm__ ("start");
#endif
106 107
#endif

108
#ifndef USE_CRT_DLL
109
#ifndef errno
Jim Blandy's avatar
Jim Blandy committed
110
extern int errno;
111
#endif
112
#endif
Jim Blandy's avatar
Jim Blandy committed
113

114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133
#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
134
#define MAXIOSIZE (32 * PAGESIZE) /* Don't I/O more than 32 blocks at a time */
135 136
#endif /* VMS */

137 138 139 140
#ifndef VMS
#include <sys/file.h>
#endif /* not VMS */

141
#ifdef HAVE_FCNTL_H
142 143
#include <fcntl.h>
#endif
Jim Blandy's avatar
Jim Blandy committed
144

145
#ifndef MSDOS
Jim Blandy's avatar
Jim Blandy committed
146
#include <sys/ioctl.h>
147
#endif
148

149
#include "systty.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
150
#include "syswait.h"
Jim Blandy's avatar
Jim Blandy committed
151 152 153

#ifdef BROKEN_TIOCGWINSZ
#undef TIOCGWINSZ
154
#undef TIOCSWINSZ
Jim Blandy's avatar
Jim Blandy committed
155 156
#endif

157
#if defined (USG) || defined (DGUX)
Jim Blandy's avatar
Jim Blandy committed
158 159 160 161
#include <sys/utsname.h>
#ifndef MEMORY_IN_STRING_H
#include <memory.h>
#endif
162
#if defined (TIOCGWINSZ) || defined (ISC4_0)
Jim Blandy's avatar
Jim Blandy committed
163 164 165 166 167 168 169
#ifdef NEED_SIOCTL
#include <sys/sioctl.h>
#endif
#ifdef NEED_PTEM_H
#include <sys/stream.h>
#include <sys/ptem.h>
#endif
170
#endif /* TIOCGWINSZ or ISC4_0 */
Karl Heuer's avatar
Karl Heuer committed
171
#endif /* USG or DGUX */
Jim Blandy's avatar
Jim Blandy committed
172 173 174

extern int quit_char;

175
#include "keyboard.h"
Jim Blandy's avatar
Jim Blandy committed
176
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
177 178 179 180 181 182 183
#include "window.h"
#include "termhooks.h"
#include "termchar.h"
#include "termopts.h"
#include "dispextern.h"
#include "process.h"

184 185 186 187 188 189 190 191
#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
192 193 194 195
#ifdef NONSYSTEM_DIR_LIBRARY
#include "ndir.h"
#endif /* NONSYSTEM_DIR_LIBRARY */

Jim Blandy's avatar
Jim Blandy committed
196 197
#include "syssignal.h"
#include "systime.h"
198 199 200 201 202 203 204 205 206 207 208 209 210 211
#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
212

213 214 215 216 217 218 219 220 221
/* 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
222 223 224 225 226 227 228 229 230 231
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

232 233 234
#ifdef HAVE_SPEED_T
#include <termios.h>
#else
235 236
#if defined (HAVE_LIBNCURSES) && ! defined (NCURSES_OSPEED_T)
#else
237
#if defined (HAVE_TERMIOS_H) && defined (GNU_LINUX)
Richard M. Stallman's avatar
Richard M. Stallman committed
238
#include <termios.h>
239
#endif
240
#endif
241
#endif
Jim Blandy's avatar
Jim Blandy committed
242

Gerd Moellmann's avatar
Gerd Moellmann committed
243 244
int emacs_ospeed;

Jim Blandy's avatar
Jim Blandy committed
245
/* The file descriptor for Emacs's input terminal.
246 247 248
   Under Unix, this is normally zero except when using X;
   under VMS, we place the input channel number here.  */
int input_fd;
249 250 251

void croak P_ ((char *));

252 253 254 255
#ifdef AIXHFT
void hft_init ();
void hft_reset ();
#endif
256

257 258 259 260
/* Temporary used by `sigblock' when defined in terms of signprocmask.  */

SIGMASKTYPE sigprocmask_set;

261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335

#ifndef HAVE_CURRENT_DIR_NAME

/* Return the current working directory.  Returns NULL on errors. 
   Any other returned value must be freed with free. This is used
   only when get_current_dir_name is not defined on the system.  */
char*
get_current_dir_name ()
{
  char *buf;
  char *pwd;
  struct stat dotstat, pwdstat;
  /* If PWD is accurate, use it instead of calling getwd.  PWD is
     sometimes a nicer name, and using it may avoid a fatal error if a
     parent directory is searchable but not readable.  */
    if ((pwd = getenv ("PWD")) != 0
      && (IS_DIRECTORY_SEP (*pwd) || (*pwd && IS_DEVICE_SEP (pwd[1])))
      && stat (pwd, &pwdstat) == 0
      && stat (".", &dotstat) == 0
      && dotstat.st_ino == pwdstat.st_ino
      && dotstat.st_dev == pwdstat.st_dev
#ifdef MAXPATHLEN
      && strlen (pwd) < MAXPATHLEN
#endif
      )
    {
      buf = (char *) malloc (strlen (pwd) + 1);
      if (!buf)
        return NULL;
      strcpy (buf, pwd);
    }
#ifdef HAVE_GETCWD
  else
    {
      size_t buf_size = 1024;
      buf = (char *) malloc (buf_size); 
      if (!buf)
        return NULL;
      for (;;)
        {
          if (getcwd (buf, buf_size) == buf)
            break;
          if (errno != ERANGE)
            {
              int tmp_errno = errno;
              free (buf);
              errno = tmp_errno;
              return NULL;
            }
          buf_size *= 2;
          buf = (char *) realloc (buf, buf_size);
          if (!buf)
            return NULL;
        }
    }
#else
  else
    {
      /* We need MAXPATHLEN here.  */
      buf = (char *) malloc (MAXPATHLEN + 1);
      if (!buf)
        return NULL;
      if (getwd (buf) == NULL)
        {
          int tmp_errno = errno;
          free (buf);
          errno = tmp_errno;
          return NULL;
        }
    }
#endif
  return buf;
}
#endif

336 337 338 339 340 341 342 343 344 345 346

/* 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
347

348
void
Jim Blandy's avatar
Jim Blandy committed
349 350
discard_tty_input ()
{
351
#ifndef WINDOWSNT
Jim Blandy's avatar
Jim Blandy committed
352
  struct emacs_tty buf;
Jim Blandy's avatar
Jim Blandy committed
353 354 355 356 357 358 359 360 361 362 363

  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
364 365
  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
366 367 368 369 370
  queue_kbd_input ();
#else /* not VMS */
#ifdef APOLLO
  {
    int zero = 0;
371
    ioctl (input_fd, TIOCFLUSH, &zero);
Jim Blandy's avatar
Jim Blandy committed
372 373
  }
#else /* not Apollo */
374
#ifdef MSDOS    /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
375
  while (dos_keyread () != -1)
376
    ;
377
#else /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
378 379
  EMACS_GET_TTY (input_fd, &buf);
  EMACS_SET_TTY (input_fd, &buf, 0);
380
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
381 382
#endif /* not Apollo */
#endif /* not VMS */
383
#endif /* not WINDOWSNT */
Jim Blandy's avatar
Jim Blandy committed
384 385 386 387
}

#ifdef SIGTSTP

388 389 390
/* Arrange for character C to be read as the next input from
   the terminal.  */

Andreas Schwab's avatar
Andreas Schwab committed
391
void
392 393 394
#ifdef PROTOTYPES
stuff_char (char c)
#else
Jim Blandy's avatar
Jim Blandy committed
395 396
stuff_char (c)
     char c;
397
#endif
Jim Blandy's avatar
Jim Blandy committed
398
{
399 400 401
  if (read_socket_hook)
    return;

Jim Blandy's avatar
Jim Blandy committed
402 403
/* Should perhaps error if in batch mode */
#ifdef TIOCSTI
404
  ioctl (input_fd, TIOCSTI, &c);
Jim Blandy's avatar
Jim Blandy committed
405
#else /* no TIOCSTI */
406
  error ("Cannot stuff terminal input characters in this version of Unix");
Jim Blandy's avatar
Jim Blandy committed
407 408 409 410
#endif /* no TIOCSTI */
}

#endif /* SIGTSTP */
411

412
void
Jim Blandy's avatar
Jim Blandy committed
413 414 415
init_baud_rate ()
{
  if (noninteractive)
Gerd Moellmann's avatar
Gerd Moellmann committed
416
    emacs_ospeed = 0;
Jim Blandy's avatar
Jim Blandy committed
417 418
  else
    {
419 420 421
#ifdef INIT_BAUD_RATE
      INIT_BAUD_RATE ();
#else
422
#ifdef DOS_NT
Gerd Moellmann's avatar
Gerd Moellmann committed
423
    emacs_ospeed = 15;
424
#else  /* not DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
425
#ifdef VMS
Jim Blandy's avatar
Jim Blandy committed
426 427 428
      struct sensemode sg;

      SYS$QIOW (0, input_fd, IO$_SENSEMODE, &sg, 0, 0,
Jim Blandy's avatar
Jim Blandy committed
429
		&sg.class, 12, 0, 0, 0, 0 );
Gerd Moellmann's avatar
Gerd Moellmann committed
430
      emacs_ospeed = sg.xmit_baud;
Jim Blandy's avatar
Jim Blandy committed
431
#else /* not VMS */
432 433
#ifdef HAVE_TERMIOS
      struct termios sg;
Jim Blandy's avatar
Jim Blandy committed
434

435
      sg.c_cflag = B9600;
436
      tcgetattr (input_fd, &sg);
Gerd Moellmann's avatar
Gerd Moellmann committed
437
      emacs_ospeed = cfgetospeed (&sg);
438
#if defined (USE_GETOBAUD) && defined (getobaud)
439
      /* m88k-motorola-sysv3 needs this (ghazi@noc.rutgers.edu) 9/1/94. */
Gerd Moellmann's avatar
Gerd Moellmann committed
440 441
      if (emacs_ospeed == 0)
        emacs_ospeed = getobaud (sg.c_cflag);
442
#endif
443 444 445
#else /* neither VMS nor TERMIOS */
#ifdef HAVE_TERMIO
      struct termio sg;
Jim Blandy's avatar
Jim Blandy committed
446

447
      sg.c_cflag = B9600;
448
#ifdef HAVE_TCATTR
449
      tcgetattr (input_fd, &sg);
450
#else
451
      ioctl (input_fd, TCGETA, &sg);
452
#endif
Gerd Moellmann's avatar
Gerd Moellmann committed
453
      emacs_ospeed = sg.c_cflag & CBAUD;
454
#else /* neither VMS nor TERMIOS nor TERMIO */
Jim Blandy's avatar
Jim Blandy committed
455
      struct sgttyb sg;
456

Jim Blandy's avatar
Jim Blandy committed
457
      sg.sg_ospeed = B9600;
458
      if (ioctl (input_fd, TIOCGETP, &sg) < 0)
459
	abort ();
Gerd Moellmann's avatar
Gerd Moellmann committed
460
      emacs_ospeed = sg.sg_ospeed;
Jim Blandy's avatar
Jim Blandy committed
461
#endif /* not HAVE_TERMIO */
462
#endif /* not HAVE_TERMIOS */
Jim Blandy's avatar
Jim Blandy committed
463
#endif /* not VMS */
464
#endif /* not DOS_NT */
465
#endif /* not INIT_BAUD_RATE */
Jim Blandy's avatar
Jim Blandy committed
466
    }
467

Gerd Moellmann's avatar
Gerd Moellmann committed
468 469
  baud_rate = (emacs_ospeed < sizeof baud_convert / sizeof baud_convert[0]
	       ? baud_convert[emacs_ospeed] : 9600);
Jim Blandy's avatar
Jim Blandy committed
470 471 472 473 474
  if (baud_rate == 0)
    baud_rate = 1200;
}

/*ARGSUSED*/
Andreas Schwab's avatar
Andreas Schwab committed
475
void
Jim Blandy's avatar
Jim Blandy committed
476 477 478 479 480 481 482 483
set_exclusive_use (fd)
     int fd;
{
#ifdef FIOCLEX
  ioctl (fd, FIOCLEX, 0);
#endif
  /* Ok to do nothing if this feature does not exist */
}
484

Jim Blandy's avatar
Jim Blandy committed
485 486 487 488
#ifndef subprocesses

wait_without_blocking ()
{
489
#ifdef BSD_SYSTEM
Jim Blandy's avatar
Jim Blandy committed
490 491 492 493 494 495 496 497 498 499
  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
500
			 (at least for bsd).  */
Jim Blandy's avatar
Jim Blandy committed
501 502 503 504 505 506 507 508

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) */

509
void
Jim Blandy's avatar
Jim Blandy committed
510 511 512 513 514 515 516 517 518
wait_for_termination (pid)
     int pid;
{
  while (1)
    {
#ifdef subprocesses
#ifdef VMS
      int status;

519
      status = SYS$FORCEX (&pid, 0, 0);
Jim Blandy's avatar
Jim Blandy committed
520 521
      break;
#else /* not VMS */
522
#if defined (BSD_SYSTEM) || (defined (HPUX) && !defined (HPUX_5))
523 524 525 526 527 528 529 530 531
      /* 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))
532
	{
533 534 535 536 537 538 539 540
	  sigsetmask (SIGEMPTYMASK);
	  kill (getpid (), SIGCHLD);
	  break;
	}
      if (wait_debugging)
	sleep (1);
      else
	sigpause (SIGEMPTYMASK);
541
#else /* not BSD_SYSTEM, and not HPUX version >= 6 */
542
#if defined (UNIPLUS)
543 544 545
      if (0 > kill (pid, 0))
	break;
      wait (0);
546
#else /* neither BSD_SYSTEM nor UNIPLUS: random sysV */
547
#ifdef POSIX_SIGNALS    /* would this work for GNU/Linux as well? */
548
      sigblock (sigmask (SIGCHLD));
549 550
      errno = 0;
      if (kill (pid, 0) == -1 && errno == ESRCH)
551 552 553 554
	{
	  sigunblock (sigmask (SIGCHLD));
	  break;
	}
555

556
      sigsuspend (&empty_mask);
557
#else /* not POSIX_SIGNALS */
558 559 560 561 562 563 564 565 566
#ifdef HAVE_SYSV_SIGPAUSE
      sighold (SIGCHLD);
      if (0 > kill (pid, 0))
	{
	  sigrelse (SIGCHLD);
	  break;
	}
      sigpause (SIGCHLD);
#else /* not HAVE_SYSV_SIGPAUSE */
567 568 569 570
#ifdef WINDOWSNT
      wait (0);
      break;
#else /* not WINDOWSNT */
571
      if (0 > kill (pid, 0))
Jim Blandy's avatar
Jim Blandy committed
572
	break;
573 574 575 576
      /* Using sleep instead of pause avoids timing error.
	 If the inferior dies just before the sleep,
	 we lose just one second.  */
      sleep (1);
577
#endif /* not WINDOWSNT */
578
#endif /* not HAVE_SYSV_SIGPAUSE */
579
#endif /* not POSIX_SIGNALS */
580
#endif /* not UNIPLUS */
581
#endif /* not BSD_SYSTEM, and not HPUX version >= 6 */
Jim Blandy's avatar
Jim Blandy committed
582 583
#endif /* not VMS */
#else /* not subprocesses */
584 585 586
#if __DJGPP__ > 1
      break;
#else /* not __DJGPP__ > 1 */
Jim Blandy's avatar
Jim Blandy committed
587 588 589 590 591 592 593 594 595 596
#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 */
597
#endif /* not __DJGPP__ > 1*/
Jim Blandy's avatar
Jim Blandy committed
598 599 600 601 602 603 604 605 606 607
#endif /* not subprocesses */
    }
}

#ifdef subprocesses

/*
 *	flush any pending output
 *      (may flush input as well; it does not matter the way we use it)
 */
608

609
void
Jim Blandy's avatar
Jim Blandy committed
610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629
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
}
630

Jim Blandy's avatar
Jim Blandy committed
631 632 633 634 635 636
#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.  */

637
void
Jim Blandy's avatar
Jim Blandy committed
638 639 640
child_setup_tty (out)
     int out;
{
641
#ifndef DOS_NT
Jim Blandy's avatar
Jim Blandy committed
642 643 644
  struct emacs_tty s;

  EMACS_GET_TTY (out, &s);
Jim Blandy's avatar
Jim Blandy committed
645

646
#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
Jim Blandy's avatar
Jim Blandy committed
647 648
  s.main.c_oflag |= OPOST;	/* Enable output postprocessing */
  s.main.c_oflag &= ~ONLCR;	/* Disable map of NL to CR-NL on output */
649
#ifdef NLDLY
Jim Blandy's avatar
Jim Blandy committed
650 651
  s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
  				/* No output delays */
652
#endif
Jim Blandy's avatar
Jim Blandy committed
653 654
  s.main.c_lflag &= ~ECHO;	/* Disable echo */
  s.main.c_lflag |= ISIG;	/* Enable signals */
Richard M. Stallman's avatar
Richard M. Stallman committed
655
#if 0  /* This causes bugs in (for instance) telnet to certain sites.  */
656 657 658 659 660
  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
661
#endif
662 663 664
#ifdef IUCLC
  s.main.c_iflag &= ~IUCLC;	/* Disable downcasing on input.  */
#endif
665 666 667
#ifdef ISTRIP
  s.main.c_iflag &= ~ISTRIP;	/* don't strip 8th bit on input */
#endif
668
#ifdef OLCUC
669 670
  s.main.c_oflag &= ~OLCUC;	/* Disable upcasing on output.  */
#endif
671
  s.main.c_oflag &= ~TAB3;	/* Disable tab expansion */
672
  s.main.c_cflag = (s.main.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
Jim Blandy's avatar
Jim Blandy committed
673
#if 0
674
  /* Said to be unnecessary:  */
Jim Blandy's avatar
Jim Blandy committed
675 676 677 678 679 680
  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 */
681 682
  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
683

Jim Blandy's avatar
Jim Blandy committed
684
#ifdef HPUX
Jim Blandy's avatar
Jim Blandy committed
685
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
686
#endif /* HPUX */
Jim Blandy's avatar
Jim Blandy committed
687

688 689 690
#ifdef SIGNALS_VIA_CHARACTERS
  /* the QUIT and INTR character are used in process_send_signal
     so set them here to something useful.  */
691
  if (s.main.c_cc[VQUIT] == CDISABLE)
692
    s.main.c_cc[VQUIT] = '\\'&037;	/* Control-\ */
693
  if (s.main.c_cc[VINTR] == CDISABLE)
694 695 696
    s.main.c_cc[VINTR] = 'C'&037;	/* Control-C */
#endif /* not SIGNALS_VIA_CHARACTERS */

Jim Blandy's avatar
Jim Blandy committed
697 698 699
#ifdef AIX
/* AIX enhanced edit loses NULs, so disable it */
#ifndef IBMR2AIX
Jim Blandy's avatar
Jim Blandy committed
700 701
  s.main.c_line = 0;
  s.main.c_iflag &= ~ASCEDIT;
Jim Blandy's avatar
Jim Blandy committed
702 703 704
#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
705 706
  s.main.c_iflag &= ~IGNBRK;
  s.main.c_iflag &= ~BRKINT;
707 708 709 710
  /* rms: Formerly it set s.main.c_cc[VINTR] to 0377 here
     unconditionally.  Then a SIGNALS_VIA_CHARACTERS conditional
     would force it to 0377.  That looks like duplicated code.  */
#ifndef SIGNALS_VIA_CHARACTERS
711
  /* QUIT and INTR work better as signals, so disable character forms */
712 713
  s.main.c_cc[VQUIT] = CDISABLE;
  s.main.c_cc[VINTR] = CDISABLE;
Jim Blandy's avatar
Jim Blandy committed
714
  s.main.c_lflag &= ~ISIG;
715
#endif /* no TIOCGPGRP or no TIOCGLTC or no TIOCGETC */
716
  s.main.c_cc[VEOL] = CDISABLE;
Jim Blandy's avatar
Jim Blandy committed
717
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
718 719 720
#endif /* AIX */

#else /* not HAVE_TERMIO */
Jim Blandy's avatar
Jim Blandy committed
721 722 723

  s.main.sg_flags &= ~(ECHO | CRMOD | ANYP | ALLDELAY | RAW | LCASE
		       | CBREAK | TANDEM);
724
  s.main.sg_flags |= LPASS8;
Jim Blandy's avatar
Jim Blandy committed
725 726
  s.main.sg_erase = 0377;
  s.main.sg_kill = 0377;
727
  s.lmode = LLITOUT | s.lmode;        /* Don't strip 8th bit */
Jim Blandy's avatar
Jim Blandy committed
728

Jim Blandy's avatar
Jim Blandy committed
729 730
#endif /* not HAVE_TERMIO */

Jim Blandy's avatar
Jim Blandy committed
731
  EMACS_SET_TTY (out, &s, 0);
Jim Blandy's avatar
Jim Blandy committed
732 733 734 735 736 737 738 739 740 741 742

#ifdef BSD4_1
  if (interrupt_input)
    reset_sigio ();
#endif /* BSD4_1 */
#ifdef RTU
  {
    int zero = 0;
    ioctl (out, FIOASYNC, &zero);
  }
#endif /* RTU */
743
#endif /* not DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
744 745 746 747
}
#endif /* not VMS */

#endif /* subprocesses */
748

Jim Blandy's avatar
Jim Blandy committed
749 750 751 752
/* Record a signal code and the handler for it.  */
struct save_signal
{
  int code;
Andreas Schwab's avatar
Andreas Schwab committed
753
  SIGTYPE (*handler) P_ ((int));
Jim Blandy's avatar
Jim Blandy committed
754 755
};

Andreas Schwab's avatar
Andreas Schwab committed
756 757 758
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
759 760
/* Suspend the Emacs process; give terminal to its superior.  */

761
void
Jim Blandy's avatar
Jim Blandy committed
762 763 764
sys_suspend ()
{
#ifdef VMS
765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782
  /* "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 ();

783
  xfree (fpid_string);		/* On VMS, this was malloc'd */
Jim Blandy's avatar
Jim Blandy committed
784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799

  if (parent_id && parent_id != 0xffffffff)
    {
      SIGTYPE (*oldsig)() = (int) signal (SIGINT, SIG_IGN);
      int status = LIB$ATTACH (&parent_id) & 1;
      signal (SIGINT, oldsig);
      return status;
    }
  else
    {
      struct {
	int	l;
	char	*a;
      } d_prompt;
      d_prompt.l = sizeof ("Emacs: ");		/* Our special prompt */
      d_prompt.a = "Emacs: ";			/* Just a reminder */
800
      LIB$SPAWN (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, &d_prompt, 0);
Jim Blandy's avatar
Jim Blandy committed
801 802 803 804
      return 1;
    }
  return -1;
#else
805
#if defined (SIGTSTP) && !defined (MSDOS)
Jim Blandy's avatar
Jim Blandy committed
806

807
  {
808
    int pgrp = EMACS_GETPGRP (0);
809 810
    EMACS_KILLPG (pgrp, SIGTSTP);
  }
Jim Blandy's avatar
Jim Blandy committed
811 812 813 814 815 816 817 818 819 820 821

#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.  */
822 823 824 825 826 827 828 829 830
  sys_subshell ();

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

/* Fork a subshell.  */

831
#ifndef MAC_OS8
832
void
833 834 835
sys_subshell ()
{
#ifndef VMS
836
#ifdef DOS_NT	/* Demacs 1.1.2 91/10/20 Manabu Higashida */
837 838 839
  int st;
  char oldwd[MAXPATHLEN+1]; /* Fixed length is safe on MSDOS.  */
#endif
840
  int pid;
Jim Blandy's avatar
Jim Blandy committed
841
  struct save_signal saved_handlers[5];
842 843 844
  Lisp_Object dir;
  unsigned char *str = 0;
  int len;
Jim Blandy's avatar
Jim Blandy committed
845 846 847 848 849 850 851 852 853 854 855

  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

856 857 858 859
  /* Mentioning current_buffer->buffer would mean including buffer.h,
     which somehow wedges the hp compiler.  So instead...  */

  dir = intern ("default-directory");
860
  if (NILP (Fboundp (dir)))
861 862
    goto xyzzy;
  dir = Fsymbol_value (dir);
863
  if (!STRINGP (dir))
864 865 866
    goto xyzzy;

  dir = expand_and_dir_to_file (Funhandled_file_name_directory (dir), Qnil);
867 868 869
  str = (unsigned char *) alloca (SCHARS (dir) + 2);
  len = SCHARS (dir);
  bcopy (SDATA (dir), str, len);
870 871 872 873
  if (str[len - 1] != '/') str[len++] = '/';
  str[len] = 0;
 xyzzy:

874
#ifdef DOS_NT
875
  pid = 0;
876 877 878 879
#if __DJGPP__ > 1
  save_signal_handlers (saved_handlers);
  synch_process_alive = 1;
#endif /* __DJGPP__ > 1 */
880
#else
881
  pid = vfork ();
Jim Blandy's avatar
Jim Blandy committed
882 883
  if (pid == -1)
    error ("Can't spawn subshell");
884 885
#endif

Jim Blandy's avatar
Jim Blandy committed
886 887
  if (pid == 0)
    {
888
      char *sh = 0;
Jim Blandy's avatar
Jim Blandy committed
889

890
#ifdef DOS_NT    /* MW, Aug 1993 */
891
      getwd (oldwd);
892 893
      if (sh == 0)
	sh = (char *) egetenv ("SUSPEND");	/* KFS, 1994-12-14 */
894
#endif
895 896
      if (sh == 0)
	sh = (char *) egetenv ("SHELL");
Jim Blandy's avatar
Jim Blandy committed
897 898
      if (sh == 0)
	sh = "sh";
899

Jim Blandy's avatar
Jim Blandy committed
900
      /* Use our buffer's default directory for the subshell.  */
901
      if (str)
902
	chdir ((char *) str);
903

Jim Blandy's avatar
Jim Blandy committed
904 905 906
#ifdef subprocesses
      close_process_descs ();	/* Close Emacs's pipes/ptys */
#endif
907

908
#ifdef SET_EMACS_PRIORITY
909
      {
910
	extern EMACS_INT emacs_priority;
911

912
	if (emacs_priority < 0)
913 914 915 916
	  nice (-emacs_priority);
      }
#endif

917
#ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida */
918
      {
919 920
	char *epwd = getenv ("PWD");
	char old_pwd[MAXPATHLEN+1+4];
921 922

	/* If PWD is set, pass it with corrected value.  */
923
	if (epwd)
924
	  {
925
	    strcpy (old_pwd, epwd);
926 927 928 929 930 931
	    if (str[len - 1] == '/')
	      str[len - 1] = '\0';
	    setenv ("PWD", str, 1);
	  }
	st = system (sh);
	chdir (oldwd);
932
	if (epwd)
933 934
	  putenv (old_pwd);	/* restore previous value */
      }
935
#if 0	/* This is also reported if last command executed in subshell failed, KFS */
936
      if (st)
937
	report_file_error ("Can't execute subshell", Fcons (build_string (sh), Qnil));
938
#endif
939
#else /* not MSDOS */
940 941 942
#ifdef  WINDOWSNT
      /* Waits for process completion */
      pid = _spawnlp (_P_WAIT, sh, sh, NULL);
943
      chdir (oldwd);
944 945 946
      if (pid == -1)
	write (1, "Can't execute subshell", 22);
#else   /* not WINDOWSNT */
947
      execlp (sh, sh, (char *) 0);
Jim Blandy's avatar
Jim Blandy committed
948 949
      write (1, "Can't execute subshell", 22);
      _exit (1);
950
#endif  /* not WINDOWSNT */
951
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
952 953
    }

954 955
  /* Do this now if we did not do it before.  */
#if !defined (MSDOS) || __DJGPP__ == 1
Jim Blandy's avatar
Jim Blandy committed
956
  save_signal_handlers (saved_handlers);
957
  synch_process_alive = 1;
958 959
#endif

960
#ifndef DOS_NT
Jim Blandy's avatar
Jim Blandy committed
961
  wait_for_termination (pid);
962
#endif
Jim Blandy's avatar
Jim Blandy committed
963
  restore_signal_handlers (saved_handlers);
964
  synch_process_alive = 0;
965
#endif /* !VMS */
Jim Blandy's avatar
Jim Blandy committed
966
}
967
#endif /* !MAC_OS8 */
Jim Blandy's avatar
Jim Blandy committed
968

Andreas Schwab's avatar
Andreas Schwab committed
969
static void
Jim Blandy's avatar
Jim Blandy committed
970 971 972 973 974
save_signal_handlers (saved_handlers)
     struct save_signal *saved_handlers;
{
  while (saved_handlers->code)
    {
Joseph Arceneaux's avatar
Joseph Arceneaux committed
975
      saved_handlers->handler
Andreas Schwab's avatar
Andreas Schwab committed
976
	= (SIGTYPE (*) P_ ((int))) signal (saved_handlers->code, SIG_IGN);
Jim Blandy's avatar
Jim Blandy committed
977 978 979 980
      saved_handlers++;
    }
}

Andreas Schwab's avatar
<