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 33
/* Including stdlib.h isn't necessarily enough to get srandom
   declared, e.g. without __USE_XOPEN_EXTENDED with glibc 2.  */
#ifdef HAVE_RANDOM
extern long int random P_ ((void));
34 35 36
#if 0 /* Don't prototype srandom; it takes an unsigned argument on
	 some systems, and an unsigned long on others, like FreeBSD
	 4.1.  */
37 38
extern void srandom P_ ((unsigned int));
#endif
39
#endif
40

41
#include "blockinput.h"
Jim Blandy's avatar
Jim Blandy committed
42 43
#undef NULL

44
#ifdef macintosh
45 46 47 48 49
/* 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>

50 51 52 53 54 55
#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
56 57
#define min(x,y) ((x) > (y) ? (y) : (x))

58
#ifdef WINDOWSNT
59 60
#define read sys_read
#define write sys_write
61
#include <windows.h>
62 63 64
#ifndef NULL
#define NULL 0
#endif
65 66
#endif /* not WINDOWSNT */

67 68 69 70 71 72 73
/* Does anyone other than VMS need this? */
#ifndef fwrite
#define sys_fwrite fwrite
#else
#undef fwrite
#endif

Jim Blandy's avatar
Jim Blandy committed
74 75 76 77 78
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>

79 80 81 82 83
/* Get _POSIX_VDISABLE, if it is available.  */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

84 85 86 87
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif

88
#ifdef HAVE_SETPGID
89
#if !defined (USG) || defined (BSD_PGRPS)
90
#undef setpgrp
91 92
#define setpgrp setpgid
#endif
93
#endif
94

95 96 97 98 99
/* Get SI_SRPC_DOMAIN, if it is available.  */
#ifdef HAVE_SYS_SYSTEMINFO_H
#include <sys/systeminfo.h>
#endif

100 101 102 103 104
#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>
105 106 107 108 109

#if __DJGPP__ > 1
extern int etext;
extern unsigned start __asm__ ("start");
#endif
110 111
#endif

112
#ifndef USE_CRT_DLL
113
#ifndef errno
Jim Blandy's avatar
Jim Blandy committed
114
extern int errno;
115
#endif
116
#endif
Jim Blandy's avatar
Jim Blandy committed
117

118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137
#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
138
#define MAXIOSIZE (32 * PAGESIZE) /* Don't I/O more than 32 blocks at a time */
139 140 141
#endif /* VMS */

#ifndef BSD4_1
142
#ifdef BSD_SYSTEM /* avoid writing defined (BSD_SYSTEM) || defined (USG)
143 144 145 146 147 148 149 150 151
	      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
152

153
#ifndef MSDOS
Jim Blandy's avatar
Jim Blandy committed
154
#include <sys/ioctl.h>
155
#endif
156

157
#include "systty.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
158
#include "syswait.h"
Jim Blandy's avatar
Jim Blandy committed
159 160 161

#ifdef BROKEN_TIOCGWINSZ
#undef TIOCGWINSZ
162
#undef TIOCSWINSZ
Jim Blandy's avatar
Jim Blandy committed
163 164
#endif

165
#if defined (USG) || defined (DGUX)
Jim Blandy's avatar
Jim Blandy committed
166 167 168 169
#include <sys/utsname.h>
#ifndef MEMORY_IN_STRING_H
#include <memory.h>
#endif
170
#if defined (TIOCGWINSZ) || defined (ISC4_0)
Jim Blandy's avatar
Jim Blandy committed
171 172 173 174 175 176 177
#ifdef NEED_SIOCTL
#include <sys/sioctl.h>
#endif
#ifdef NEED_PTEM_H
#include <sys/stream.h>
#include <sys/ptem.h>
#endif
178
#endif /* TIOCGWINSZ or ISC4_0 */
Karl Heuer's avatar
Karl Heuer committed
179
#endif /* USG or DGUX */
Jim Blandy's avatar
Jim Blandy committed
180 181 182

extern int quit_char;

183
#include "keyboard.h"
Jim Blandy's avatar
Jim Blandy committed
184
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
185 186 187 188 189 190 191
#include "window.h"
#include "termhooks.h"
#include "termchar.h"
#include "termopts.h"
#include "dispextern.h"
#include "process.h"

192 193 194 195 196 197 198 199
#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
200 201 202 203
#ifdef NONSYSTEM_DIR_LIBRARY
#include "ndir.h"
#endif /* NONSYSTEM_DIR_LIBRARY */

Jim Blandy's avatar
Jim Blandy committed
204 205
#include "syssignal.h"
#include "systime.h"
206 207 208 209 210 211 212 213 214 215 216 217 218 219
#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
220

221 222 223 224 225 226 227 228 229
/* 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
230 231 232 233 234 235 236 237 238 239
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

240 241 242
#ifdef HAVE_SPEED_T
#include <termios.h>
#else
243 244
#if defined (HAVE_LIBNCURSES) && ! defined (NCURSES_OSPEED_T)
#else
Richard M. Stallman's avatar
Richard M. Stallman committed
245 246
#if defined (HAVE_TERMIOS_H) && defined (LINUX)
#include <termios.h>
247
#endif
248
#endif
249
#endif
Jim Blandy's avatar
Jim Blandy committed
250

Gerd Moellmann's avatar
Gerd Moellmann committed
251 252
int emacs_ospeed;

Jim Blandy's avatar
Jim Blandy committed
253
/* The file descriptor for Emacs's input terminal.
254 255 256
   Under Unix, this is normally zero except when using X;
   under VMS, we place the input channel number here.  */
int input_fd;
257 258 259

void croak P_ ((char *));

260 261 262 263
#ifdef AIXHFT
void hft_init ();
void hft_reset ();
#endif
264

265 266 267 268
/* Temporary used by `sigblock' when defined in terms of signprocmask.  */

SIGMASKTYPE sigprocmask_set;

269 270 271 272 273 274 275 276 277 278 279

/* 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
280

281
void
Jim Blandy's avatar
Jim Blandy committed
282 283
discard_tty_input ()
{
284
#ifndef WINDOWSNT
Jim Blandy's avatar
Jim Blandy committed
285
  struct emacs_tty buf;
Jim Blandy's avatar
Jim Blandy committed
286 287 288 289 290 291 292 293 294 295 296

  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
297 298
  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
299 300 301 302 303
  queue_kbd_input ();
#else /* not VMS */
#ifdef APOLLO
  {
    int zero = 0;
304
    ioctl (input_fd, TIOCFLUSH, &zero);
Jim Blandy's avatar
Jim Blandy committed
305 306
  }
#else /* not Apollo */
307
#ifdef MSDOS    /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
308
  while (dos_keyread () != -1)
309
    ;
310
#else /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
311 312
  EMACS_GET_TTY (input_fd, &buf);
  EMACS_SET_TTY (input_fd, &buf, 0);
313
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
314 315
#endif /* not Apollo */
#endif /* not VMS */
316
#endif /* not WINDOWSNT */
Jim Blandy's avatar
Jim Blandy committed
317 318 319 320
}

#ifdef SIGTSTP

321 322 323
/* Arrange for character C to be read as the next input from
   the terminal.  */

Andreas Schwab's avatar
Andreas Schwab committed
324
void
Jim Blandy's avatar
Jim Blandy committed
325 326 327
stuff_char (c)
     char c;
{
328 329 330
  if (read_socket_hook)
    return;

Jim Blandy's avatar
Jim Blandy committed
331 332
/* Should perhaps error if in batch mode */
#ifdef TIOCSTI
333
  ioctl (input_fd, TIOCSTI, &c);
Jim Blandy's avatar
Jim Blandy committed
334
#else /* no TIOCSTI */
335
  error ("Cannot stuff terminal input characters in this version of Unix");
Jim Blandy's avatar
Jim Blandy committed
336 337 338 339
#endif /* no TIOCSTI */
}

#endif /* SIGTSTP */
340

341
void
Jim Blandy's avatar
Jim Blandy committed
342 343 344
init_baud_rate ()
{
  if (noninteractive)
Gerd Moellmann's avatar
Gerd Moellmann committed
345
    emacs_ospeed = 0;
Jim Blandy's avatar
Jim Blandy committed
346 347
  else
    {
348 349 350
#ifdef INIT_BAUD_RATE
      INIT_BAUD_RATE ();
#else
351
#ifdef DOS_NT
Gerd Moellmann's avatar
Gerd Moellmann committed
352
    emacs_ospeed = 15;
353
#else  /* not DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
354
#ifdef VMS
Jim Blandy's avatar
Jim Blandy committed
355 356 357
      struct sensemode sg;

      SYS$QIOW (0, input_fd, IO$_SENSEMODE, &sg, 0, 0,
Jim Blandy's avatar
Jim Blandy committed
358
		&sg.class, 12, 0, 0, 0, 0 );
Gerd Moellmann's avatar
Gerd Moellmann committed
359
      emacs_ospeed = sg.xmit_baud;
Jim Blandy's avatar
Jim Blandy committed
360
#else /* not VMS */
361 362
#ifdef HAVE_TERMIOS
      struct termios sg;
Jim Blandy's avatar
Jim Blandy committed
363

364
      sg.c_cflag = B9600;
365
      tcgetattr (input_fd, &sg);
Gerd Moellmann's avatar
Gerd Moellmann committed
366
      emacs_ospeed = cfgetospeed (&sg);
367
#if defined (USE_GETOBAUD) && defined (getobaud)
368
      /* m88k-motorola-sysv3 needs this (ghazi@noc.rutgers.edu) 9/1/94. */
Gerd Moellmann's avatar
Gerd Moellmann committed
369 370
      if (emacs_ospeed == 0)
        emacs_ospeed = getobaud (sg.c_cflag);
371
#endif
372 373 374
#else /* neither VMS nor TERMIOS */
#ifdef HAVE_TERMIO
      struct termio sg;
Jim Blandy's avatar
Jim Blandy committed
375

376
      sg.c_cflag = B9600;
377
#ifdef HAVE_TCATTR
378
      tcgetattr (input_fd, &sg);
379
#else
380
      ioctl (input_fd, TCGETA, &sg);
381
#endif
Gerd Moellmann's avatar
Gerd Moellmann committed
382
      emacs_ospeed = sg.c_cflag & CBAUD;
383
#else /* neither VMS nor TERMIOS nor TERMIO */
Jim Blandy's avatar
Jim Blandy committed
384 385 386
      struct sgttyb sg;
      
      sg.sg_ospeed = B9600;
387
      if (ioctl (input_fd, TIOCGETP, &sg) < 0)
388
	abort ();
Gerd Moellmann's avatar
Gerd Moellmann committed
389
      emacs_ospeed = sg.sg_ospeed;
Jim Blandy's avatar
Jim Blandy committed
390
#endif /* not HAVE_TERMIO */
391
#endif /* not HAVE_TERMIOS */
Jim Blandy's avatar
Jim Blandy committed
392
#endif /* not VMS */
393
#endif /* not DOS_NT */
394
#endif /* not INIT_BAUD_RATE */
Jim Blandy's avatar
Jim Blandy committed
395 396
    }
   
Gerd Moellmann's avatar
Gerd Moellmann committed
397 398
  baud_rate = (emacs_ospeed < sizeof baud_convert / sizeof baud_convert[0]
	       ? baud_convert[emacs_ospeed] : 9600);
Jim Blandy's avatar
Jim Blandy committed
399 400 401 402 403
  if (baud_rate == 0)
    baud_rate = 1200;
}

/*ARGSUSED*/
Andreas Schwab's avatar
Andreas Schwab committed
404
void
Jim Blandy's avatar
Jim Blandy committed
405 406 407 408 409 410 411 412
set_exclusive_use (fd)
     int fd;
{
#ifdef FIOCLEX
  ioctl (fd, FIOCLEX, 0);
#endif
  /* Ok to do nothing if this feature does not exist */
}
413

Jim Blandy's avatar
Jim Blandy committed
414 415 416 417
#ifndef subprocesses

wait_without_blocking ()
{
418
#ifdef BSD_SYSTEM
Jim Blandy's avatar
Jim Blandy committed
419 420 421 422 423 424 425 426 427 428
  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
429
			 (at least for bsd).  */
Jim Blandy's avatar
Jim Blandy committed
430 431 432 433 434 435 436 437

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) */

438
void
Jim Blandy's avatar
Jim Blandy committed
439 440 441 442 443 444 445 446 447
wait_for_termination (pid)
     int pid;
{
  while (1)
    {
#ifdef subprocesses
#ifdef VMS
      int status;

448
      status = SYS$FORCEX (&pid, 0, 0);
Jim Blandy's avatar
Jim Blandy committed
449 450
      break;
#else /* not VMS */
451
#if defined (BSD_SYSTEM) || (defined (HPUX) && !defined (HPUX_5))
452 453 454 455 456 457 458 459 460
      /* 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))
461
	{
462 463 464 465 466 467 468 469
	  sigsetmask (SIGEMPTYMASK);
	  kill (getpid (), SIGCHLD);
	  break;
	}
      if (wait_debugging)
	sleep (1);
      else
	sigpause (SIGEMPTYMASK);
470
#else /* not BSD_SYSTEM, and not HPUX version >= 6 */
471
#if defined (UNIPLUS)
472 473 474
      if (0 > kill (pid, 0))
	break;
      wait (0);
475
#else /* neither BSD_SYSTEM nor UNIPLUS: random sysV */
476
#ifdef POSIX_SIGNALS    /* would this work for LINUX as well? */
477 478 479 480 481 482
      sigblock (sigmask (SIGCHLD));
      if (0 > kill (pid, 0))
	{
	  sigunblock (sigmask (SIGCHLD));
	  break;
	}
483
      sigpause (SIGEMPTYMASK);
484
#else /* not POSIX_SIGNALS */
485 486 487 488 489 490 491 492 493
#ifdef HAVE_SYSV_SIGPAUSE
      sighold (SIGCHLD);
      if (0 > kill (pid, 0))
	{
	  sigrelse (SIGCHLD);
	  break;
	}
      sigpause (SIGCHLD);
#else /* not HAVE_SYSV_SIGPAUSE */
494 495 496 497
#ifdef WINDOWSNT
      wait (0);
      break;
#else /* not WINDOWSNT */
498
      if (0 > kill (pid, 0))
Jim Blandy's avatar
Jim Blandy committed
499
	break;
500 501 502 503
      /* Using sleep instead of pause avoids timing error.
	 If the inferior dies just before the sleep,
	 we lose just one second.  */
      sleep (1);
504
#endif /* not WINDOWSNT */
505
#endif /* not HAVE_SYSV_SIGPAUSE */
506
#endif /* not POSIX_SIGNALS */
507
#endif /* not UNIPLUS */
508
#endif /* not BSD_SYSTEM, and not HPUX version >= 6 */
Jim Blandy's avatar
Jim Blandy committed
509 510
#endif /* not VMS */
#else /* not subprocesses */
511 512 513
#if __DJGPP__ > 1
      break;
#else /* not __DJGPP__ > 1 */
Jim Blandy's avatar
Jim Blandy committed
514 515 516 517 518 519 520 521 522 523
#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 */
524
#endif /* not __DJGPP__ > 1*/
Jim Blandy's avatar
Jim Blandy committed
525 526 527 528 529 530 531 532 533 534 535
#endif /* not subprocesses */
    }
}

#ifdef subprocesses

/*
 *	flush any pending output
 *      (may flush input as well; it does not matter the way we use it)
 */
 
536
void
Jim Blandy's avatar
Jim Blandy committed
537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556
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
}
557

Jim Blandy's avatar
Jim Blandy committed
558 559 560 561 562 563
#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.  */

564
void
Jim Blandy's avatar
Jim Blandy committed
565 566 567
child_setup_tty (out)
     int out;
{
568
#ifndef DOS_NT
Jim Blandy's avatar
Jim Blandy committed
569 570 571
  struct emacs_tty s;

  EMACS_GET_TTY (out, &s);
Jim Blandy's avatar
Jim Blandy committed
572

573
#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
Jim Blandy's avatar
Jim Blandy committed
574 575
  s.main.c_oflag |= OPOST;	/* Enable output postprocessing */
  s.main.c_oflag &= ~ONLCR;	/* Disable map of NL to CR-NL on output */
576
#ifdef NLDLY
Jim Blandy's avatar
Jim Blandy committed
577 578
  s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
  				/* No output delays */
579
#endif
Jim Blandy's avatar
Jim Blandy committed
580 581
  s.main.c_lflag &= ~ECHO;	/* Disable echo */
  s.main.c_lflag |= ISIG;	/* Enable signals */
582 583 584
#ifdef IUCLC
  s.main.c_iflag &= ~IUCLC;	/* Disable downcasing on input.  */
#endif
585 586 587
#ifdef ISTRIP
  s.main.c_iflag &= ~ISTRIP;	/* don't strip 8th bit on input */
#endif
588
#ifdef OLCUC
589 590
  s.main.c_oflag &= ~OLCUC;	/* Disable upcasing on output.  */
#endif
591
  s.main.c_oflag &= ~TAB3;	/* Disable tab expansion */
592
  s.main.c_cflag = (s.main.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
Jim Blandy's avatar
Jim Blandy committed
593
#if 0
594
  /* Said to be unnecessary:  */
Jim Blandy's avatar
Jim Blandy committed
595 596 597 598 599 600
  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 */
601 602
  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
603

Jim Blandy's avatar
Jim Blandy committed
604
#ifdef HPUX
Jim Blandy's avatar
Jim Blandy committed
605
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
606
#endif /* HPUX */
Jim Blandy's avatar
Jim Blandy committed
607

Jim Blandy's avatar
Jim Blandy committed
608 609 610
#ifdef AIX
/* AIX enhanced edit loses NULs, so disable it */
#ifndef IBMR2AIX
Jim Blandy's avatar
Jim Blandy committed
611 612
  s.main.c_line = 0;
  s.main.c_iflag &= ~ASCEDIT;
Jim Blandy's avatar
Jim Blandy committed
613 614 615
#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
616 617 618 619
  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;
620 621 622 623 624 625 626 627 628 629 630
#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
631
  s.main.c_lflag &= ~ISIG;
632 633
#endif /* no TIOCGPGRP or no TIOCGLTC or no TIOCGETC */
  s.main.c_cc[VEOL] = 0377;
Jim Blandy's avatar
Jim Blandy committed
634
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
635 636 637
#endif /* AIX */

#else /* not HAVE_TERMIO */
Jim Blandy's avatar
Jim Blandy committed
638 639 640

  s.main.sg_flags &= ~(ECHO | CRMOD | ANYP | ALLDELAY | RAW | LCASE
		       | CBREAK | TANDEM);
641
  s.main.sg_flags |= LPASS8;
Jim Blandy's avatar
Jim Blandy committed
642 643
  s.main.sg_erase = 0377;
  s.main.sg_kill = 0377;
644
  s.lmode = LLITOUT | s.lmode;        /* Don't strip 8th bit */
Jim Blandy's avatar
Jim Blandy committed
645

Jim Blandy's avatar
Jim Blandy committed
646 647
#endif /* not HAVE_TERMIO */

Jim Blandy's avatar
Jim Blandy committed
648
  EMACS_SET_TTY (out, &s, 0);
Jim Blandy's avatar
Jim Blandy committed
649 650 651 652 653 654 655 656 657 658 659

#ifdef BSD4_1
  if (interrupt_input)
    reset_sigio ();
#endif /* BSD4_1 */
#ifdef RTU
  {
    int zero = 0;
    ioctl (out, FIOASYNC, &zero);
  }
#endif /* RTU */
660
#endif /* not DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
661 662 663 664
}
#endif /* not VMS */

#endif /* subprocesses */
665

Jim Blandy's avatar
Jim Blandy committed
666 667 668 669
/* Record a signal code and the handler for it.  */
struct save_signal
{
  int code;
Andreas Schwab's avatar
Andreas Schwab committed
670
  SIGTYPE (*handler) P_ ((int));
Jim Blandy's avatar
Jim Blandy committed
671 672
};

Andreas Schwab's avatar
Andreas Schwab committed
673 674 675
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
676 677
/* Suspend the Emacs process; give terminal to its superior.  */

678
void
Jim Blandy's avatar
Jim Blandy committed
679 680 681
sys_suspend ()
{
#ifdef VMS
682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699
  /* "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 ();

700
  xfree (fpid_string);		/* On VMS, this was malloc'd */
Jim Blandy's avatar
Jim Blandy committed
701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716

  if (parent_id && parent_id != 0xffffffff)
    {
      SIGTYPE (*oldsig)() = (int) signal (SIGINT, SIG_IGN);
      int status = LIB$ATTACH (&parent_id) & 1;
      signal (SIGINT, oldsig);
      return status;
    }
  else
    {
      struct {
	int	l;
	char	*a;
      } d_prompt;
      d_prompt.l = sizeof ("Emacs: ");		/* Our special prompt */
      d_prompt.a = "Emacs: ";			/* Just a reminder */
717
      LIB$SPAWN (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, &d_prompt, 0);
Jim Blandy's avatar
Jim Blandy committed
718 719 720 721
      return 1;
    }
  return -1;
#else
722
#if defined (SIGTSTP) && !defined (MSDOS)
Jim Blandy's avatar
Jim Blandy committed
723

724
  {
725
    int pgrp = EMACS_GETPGRP (0);
726 727
    EMACS_KILLPG (pgrp, SIGTSTP);
  }
Jim Blandy's avatar
Jim Blandy committed
728 729 730 731 732 733 734 735 736 737 738

#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.  */
739 740 741 742 743 744 745 746 747
  sys_subshell ();

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

/* Fork a subshell.  */

748
#ifndef macintosh
749
void
750 751 752
sys_subshell ()
{
#ifndef VMS
753
#ifdef DOS_NT	/* Demacs 1.1.2 91/10/20 Manabu Higashida */
754 755 756
  int st;
  char oldwd[MAXPATHLEN+1]; /* Fixed length is safe on MSDOS.  */
#endif
757
  int pid;
Jim Blandy's avatar
Jim Blandy committed
758
  struct save_signal saved_handlers[5];
759 760 761
  Lisp_Object dir;
  unsigned char *str = 0;
  int len;
Jim Blandy's avatar
Jim Blandy committed
762 763 764 765 766 767 768 769 770 771 772

  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

773 774 775 776
  /* Mentioning current_buffer->buffer would mean including buffer.h,
     which somehow wedges the hp compiler.  So instead...  */

  dir = intern ("default-directory");
777
  if (NILP (Fboundp (dir)))
778 779
    goto xyzzy;
  dir = Fsymbol_value (dir);
780
  if (!STRINGP (dir))
781 782 783 784 785 786 787 788 789 790
    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:

791
#ifdef DOS_NT
792
  pid = 0;
793 794 795 796
#if __DJGPP__ > 1
  save_signal_handlers (saved_handlers);
  synch_process_alive = 1;
#endif /* __DJGPP__ > 1 */
797
#else  
798
  pid = vfork ();
Jim Blandy's avatar
Jim Blandy committed
799 800
  if (pid == -1)
    error ("Can't spawn subshell");
801 802
#endif

Jim Blandy's avatar
Jim Blandy committed
803 804
  if (pid == 0)
    {
805
      char *sh = 0;
Jim Blandy's avatar
Jim Blandy committed
806

807
#ifdef DOS_NT    /* MW, Aug 1993 */
808
      getwd (oldwd);
809 810
      if (sh == 0)
	sh = (char *) egetenv ("SUSPEND");	/* KFS, 1994-12-14 */
811
#endif
812 813
      if (sh == 0)
	sh = (char *) egetenv ("SHELL");
Jim Blandy's avatar
Jim Blandy committed
814 815
      if (sh == 0)
	sh = "sh";
816

Jim Blandy's avatar
Jim Blandy committed
817
      /* Use our buffer's default directory for the subshell.  */
818
      if (str)
819
	chdir ((char *) str);
820

Jim Blandy's avatar
Jim Blandy committed
821 822 823
#ifdef subprocesses
      close_process_descs ();	/* Close Emacs's pipes/ptys */
#endif
824

825
#ifdef SET_EMACS_PRIORITY
826 827 828
      {
	extern int emacs_priority;

829
	if (emacs_priority < 0)
830 831 832 833
	  nice (-emacs_priority);
      }
#endif

834
#ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida */
835 836
      st = system (sh);
      chdir (oldwd);
837
#if 0	/* This is also reported if last command executed in subshell failed, KFS */
838
      if (st)
839
	report_file_error ("Can't execute subshell", Fcons (build_string (sh), Qnil));
840
#endif
841
#else /* not MSDOS */
842 843 844
#ifdef  WINDOWSNT
      /* Waits for process completion */
      pid = _spawnlp (_P_WAIT, sh, sh, NULL);
845
      chdir (oldwd);
846 847 848
      if (pid == -1)
	write (1, "Can't execute subshell", 22);
#else   /* not WINDOWSNT */
Jim Blandy's avatar
Jim Blandy committed
849 850 851
      execlp (sh, sh, 0);
      write (1, "Can't execute subshell", 22);
      _exit (1);
852
#endif  /* not WINDOWSNT */
853
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
854 855
    }

856 857
  /* Do this now if we did not do it before.  */
#if !defined (MSDOS) || __DJGPP__ == 1
Jim Blandy's avatar
Jim Blandy committed
858
  save_signal_handlers (saved_handlers);
859
  synch_process_alive = 1;
860 861
#endif

862
#ifndef DOS_NT
Jim Blandy's avatar
Jim Blandy committed
863
  wait_for_termination (pid);
864
#endif
Jim Blandy's avatar
Jim Blandy committed
865
  restore_signal_handlers (saved_handlers);
866
  synch_process_alive = 0;
867
#endif /* !VMS */
Jim Blandy's avatar
Jim Blandy committed
868
}
869
#endif /* !macintosh */
Jim Blandy's avatar
Jim Blandy committed
870

Andreas Schwab's avatar
Andreas Schwab committed
871
static void
Jim Blandy's avatar
Jim Blandy committed
872 873 874 875 876
save_signal_handlers (saved_handlers)
     struct save_signal *saved_handlers;
{
  while (saved_handlers->code)
    {
Joseph Arceneaux's avatar
Joseph Arceneaux committed
877
      saved_handlers->handler
Andreas Schwab's avatar
Andreas Schwab committed
878
	= (SIGTYPE (*) P_ ((int))) signal (saved_handlers->code, SIG_IGN);
Jim Blandy's avatar
Jim Blandy committed
879 880 881 882
      saved_handlers++;
    }
}

Andreas Schwab's avatar
Andreas Schwab committed
883
static void
Jim Blandy's avatar
Jim Blandy committed
884 885 886 887 888 889 890 891 892 893 894 895 896 897
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;

898
void
899 900
init_sigio (fd)
     int fd;
Jim Blandy's avatar
Jim Blandy committed
901 902
{
#ifdef FASYNC
903 904
  old_fcntl_flags = fcntl (fd, F_GETFL, 0) & ~FASYNC;
  fcntl (fd, F_SETFL, old_fcntl_flags | FASYNC);
Jim Blandy's avatar
Jim Blandy committed
905
#endif
906
  interrupts_deferred = 0;
Jim Blandy's avatar
Jim Blandy committed
907 908
}

Andreas Schwab's avatar
Andreas Schwab committed
909
void
Jim Blandy's avatar
Jim Blandy committed
910 911 912 913 914
reset_sigio ()
{
  unrequest_sigio ();
}

915
#ifdef FASYNC		/* F_SETFL does not imply existence of FASYNC */
Jim Blandy's avatar
Jim Blandy committed
916

917
void
Jim Blandy's avatar
Jim Blandy committed
918 919
request_sigio ()
{
920 921 922
  if (read_socket_hook)
    return;

Jim Blandy's avatar
Jim Blandy committed
923
#ifdef SIGWINCH
Jim Blandy's avatar
Jim Blandy committed
924
  sigunblock (sigmask (SIGWINCH));
Jim Blandy's avatar
Jim Blandy committed
925
#endif
926
  fcntl (input_fd, F_SETFL, old_fcntl_flags | FASYNC);
Jim Blandy's avatar
Jim Blandy committed
927 928 929 930

  interrupts_deferred = 0;
}

931
void
Jim Blandy's avatar
Jim Blandy committed
932 933
unrequest_sigio ()
{
934 935 936
  if (read_socket_hook)
    return;

Jim Blandy's avatar
Jim Blandy committed
937
#ifdef SIGWINCH
Jim Blandy's avatar
Jim Blandy committed
938
  sigblock (sigmask (SIGWINCH));
Jim Blandy's avatar
Jim Blandy committed
939
#endif
940
  fcntl (input_fd, F_SETFL, old_fcntl_flags);
Jim Blandy's avatar
Jim Blandy committed
941 942 943 944 945 946
  interrupts_deferred = 1;
}

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

947
void
Jim Blandy's avatar
Jim Blandy committed
948 949 950
request_sigio ()
{
  int on = 1;
951 952 953 954

  if (read_socket_hook)
    return;

955
  ioctl (input_fd, FIOASYNC, &on);
Jim Blandy's avatar
Jim Blandy committed
956 957 958
  interrupts_deferred = 0;
}

959
void
Jim Blandy's avatar
Jim Blandy committed
960 961 962 963
unrequest_sigio ()
{
  int off = 0;

964 965 966
  if (read_socket_hook)
    return;

967
  ioctl (input_fd, FIOASYNC, &off);
Jim Blandy's avatar
Jim Blandy committed
968 969 970 971 972
  interrupts_deferred = 1;
}

#else /* not FASYNC, not STRIDE */
 
973 974 975 976
#ifdef _CX_UX

#include <termios.h>

977
void
978 979 980 981 982
request_sigio ()
{
  int on = 1;
  sigset_t st;

983 984 985
  if (read_socket_hook)
    return;