sysdep.c 92.7 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,
Glenn Morris's avatar
Glenn Morris committed
3
                 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
Glenn Morris's avatar
Glenn Morris committed
4
                 Free Software Foundation, Inc.
Jim Blandy's avatar
Jim Blandy committed
5 6 7

This file is part of GNU Emacs.

8
GNU Emacs is free software: you can redistribute it and/or modify
Jim Blandy's avatar
Jim Blandy committed
9
it under the terms of the GNU General Public License as published by
10 11
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Jim Blandy's avatar
Jim Blandy committed
12 13 14 15 16 17 18

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
19
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
Jim Blandy's avatar
Jim Blandy committed
20

Pavel Janík's avatar
Pavel Janík committed
21 22 23
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
Jim Blandy's avatar
Jim Blandy committed
24

25
#include <ctype.h>
Jim Blandy's avatar
Jim Blandy committed
26
#include <signal.h>
27
#include <stdio.h>
Jim Blandy's avatar
Jim Blandy committed
28
#include <setjmp.h>
29 30 31 32 33 34 35
#ifdef HAVE_PWD_H
#include <pwd.h>
#include <grp.h>
#endif /* HAVE_PWD_H */
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif /* HAVE_LIMITS_H */
36 37 38
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
Dan Nicolaescu's avatar
Dan Nicolaescu committed
39 40 41 42
#ifdef HAVE_ALLOCA_H
#include <alloca.h>
#endif /* HAVE_ALLOCA_H */

Jim Blandy's avatar
Jim Blandy committed
43
#include "lisp.h"
44 45 46
/* Including stdlib.h isn't necessarily enough to get srandom
   declared, e.g. without __USE_XOPEN_EXTENDED with glibc 2.  */

47 48 49
/* The w32 build defines select stuff in w32.h, which is included by
   sys/select.h (included below).   */
#ifndef WINDOWSNT
50
#include "sysselect.h"
51
#endif
52

53
#include "blockinput.h"
Jim Blandy's avatar
Jim Blandy committed
54

55
#ifdef WINDOWSNT
56 57
#define read sys_read
#define write sys_write
58
#include <windows.h>
59 60 61
#ifndef NULL
#define NULL 0
#endif
62 63
#endif /* not WINDOWSNT */

64 65 66 67 68 69 70
/* Does anyone other than VMS need this? */
#ifndef fwrite
#define sys_fwrite fwrite
#else
#undef fwrite
#endif

Jim Blandy's avatar
Jim Blandy committed
71 72 73 74
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>

75
#ifdef HAVE_SETPGID
76
#if !defined (USG) || defined (BSD_PGRPS)
77
#undef setpgrp
78 79
#define setpgrp setpgid
#endif
80
#endif
81

82 83 84 85 86
/* Get SI_SRPC_DOMAIN, if it is available.  */
#ifdef HAVE_SYS_SYSTEMINFO_H
#include <sys/systeminfo.h>
#endif

87 88 89 90 91
#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>
92 93 94 95 96

#if __DJGPP__ > 1
extern int etext;
extern unsigned start __asm__ ("start");
#endif
97 98
#endif

99
#ifndef USE_CRT_DLL
100
#ifndef errno
Jim Blandy's avatar
Jim Blandy committed
101
extern int errno;
102
#endif
103
#endif
Jim Blandy's avatar
Jim Blandy committed
104

105
#include <sys/file.h>
106

107
#ifdef HAVE_FCNTL_H
108 109
#include <fcntl.h>
#endif
Jim Blandy's avatar
Jim Blandy committed
110

111
#ifndef MSDOS
Jim Blandy's avatar
Jim Blandy committed
112
#include <sys/ioctl.h>
113
#endif
114

115
#include "systty.h"
Richard M. Stallman's avatar
Richard M. Stallman committed
116
#include "syswait.h"
Jim Blandy's avatar
Jim Blandy committed
117

Dan Nicolaescu's avatar
Dan Nicolaescu committed
118
#if defined (USG)
Jim Blandy's avatar
Jim Blandy committed
119 120
#include <sys/utsname.h>
#include <memory.h>
Dan Nicolaescu's avatar
Dan Nicolaescu committed
121
#endif /* USG */
Jim Blandy's avatar
Jim Blandy committed
122 123 124

extern int quit_char;

125
#include "keyboard.h"
Jim Blandy's avatar
Jim Blandy committed
126
#include "frame.h"
Jim Blandy's avatar
Jim Blandy committed
127 128 129 130 131 132
#include "window.h"
#include "termhooks.h"
#include "termchar.h"
#include "termopts.h"
#include "dispextern.h"
#include "process.h"
Karoly Lorentey's avatar
Karoly Lorentey committed
133
#include "cm.h"  /* for reset_sys_modes */
Jim Blandy's avatar
Jim Blandy committed
134

Glenn Morris's avatar
Glenn Morris committed
135
/* For serial_configure and serial_open.  */
136 137 138 139
extern Lisp_Object QCport, QCspeed, QCprocess;
extern Lisp_Object QCbytesize, QCstopbits, QCparity, Qodd, Qeven;
extern Lisp_Object QCflowcontrol, Qhw, Qsw, QCsummary;

140 141 142 143
#ifdef WINDOWSNT
#include <direct.h>
/* In process.h which conflicts with the local copy.  */
#define _P_WAIT 0
144 145
int _cdecl _spawnlp (int, const char *, const char *, ...);
int _cdecl _getpid (void);
146
extern char *getwd (char *);
147 148
#endif

Jim Blandy's avatar
Jim Blandy committed
149 150
#include "syssignal.h"
#include "systime.h"
151 152 153 154 155 156 157 158 159 160 161 162 163 164
#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
165

166 167 168 169 170
/* LPASS8 is new in 4.3, and makes cbreak mode provide all 8 bits.  */
#ifndef LPASS8
#define LPASS8 0
#endif

171
static const int baud_convert[] =
Jim Blandy's avatar
Jim Blandy committed
172 173 174 175 176
  {
    0, 50, 75, 110, 135, 150, 200, 300, 600, 1200,
    1800, 2400, 4800, 9600, 19200, 38400
  };

177 178 179
#ifdef HAVE_SPEED_T
#include <termios.h>
#else
180 181
#if defined (HAVE_LIBNCURSES) && ! defined (NCURSES_OSPEED_T)
#else
182
#if defined (HAVE_TERMIOS_H) && defined (GNU_LINUX)
Richard M. Stallman's avatar
Richard M. Stallman committed
183
#include <termios.h>
184
#endif
185
#endif
186
#endif
Jim Blandy's avatar
Jim Blandy committed
187

Gerd Moellmann's avatar
Gerd Moellmann committed
188 189
int emacs_ospeed;

190
void croak P_ ((char *)) NO_RETURN;
191

192 193 194 195
/* Temporary used by `sigblock' when defined in terms of signprocmask.  */

SIGMASKTYPE sigprocmask_set;

196

197
#if !defined (HAVE_GET_CURRENT_DIR_NAME) || defined (BROKEN_GET_CURRENT_DIR_NAME)
198

199
/* Return the current working directory.  Returns NULL on errors.
200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230
   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;
231
      buf = (char *) malloc (buf_size);
232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270
      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

271

272
/* Discard pending input on all input descriptors.  */
Jim Blandy's avatar
Jim Blandy committed
273

274
void
Jim Blandy's avatar
Jim Blandy committed
275 276
discard_tty_input ()
{
277
#ifndef WINDOWSNT
Jim Blandy's avatar
Jim Blandy committed
278
  struct emacs_tty buf;
Jim Blandy's avatar
Jim Blandy committed
279 280 281 282

  if (noninteractive)
    return;

283
#ifdef MSDOS    /* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
284
  while (dos_keyread () != -1)
285
    ;
286
#else /* not MSDOS */
287
  {
288
    struct tty_display_info *tty;
289 290
    for (tty = tty_list; tty; tty = tty->next)
      {
291 292 293 294 295
        if (tty->input)         /* Is the device suspended? */
          {
            EMACS_GET_TTY (fileno (tty->input), &buf);
            EMACS_SET_TTY (fileno (tty->input), &buf, 0);
          }
296 297
      }
  }
298
#endif /* not MSDOS */
299
#endif /* not WINDOWSNT */
Jim Blandy's avatar
Jim Blandy committed
300 301
}

302

Jim Blandy's avatar
Jim Blandy committed
303 304
#ifdef SIGTSTP

305
/* Arrange for character C to be read as the next input from
306 307 308
   the terminal.
   XXX What if we have multiple ttys?
*/
309

Andreas Schwab's avatar
Andreas Schwab committed
310
void
311
stuff_char (char c)
Jim Blandy's avatar
Jim Blandy committed
312
{
313
  if (! FRAME_TERMCAP_P (SELECTED_FRAME ()))
314 315
    return;

Jim Blandy's avatar
Jim Blandy committed
316 317
/* Should perhaps error if in batch mode */
#ifdef TIOCSTI
318
  ioctl (fileno (CURTTY()->input), TIOCSTI, &c);
Jim Blandy's avatar
Jim Blandy committed
319
#else /* no TIOCSTI */
320
  error ("Cannot stuff terminal input characters in this version of Unix");
Jim Blandy's avatar
Jim Blandy committed
321 322 323 324
#endif /* no TIOCSTI */
}

#endif /* SIGTSTP */
325

326
void
327
init_baud_rate (int fd)
Jim Blandy's avatar
Jim Blandy committed
328 329
{
  if (noninteractive)
Gerd Moellmann's avatar
Gerd Moellmann committed
330
    emacs_ospeed = 0;
Jim Blandy's avatar
Jim Blandy committed
331 332
  else
    {
333
#ifdef DOS_NT
Gerd Moellmann's avatar
Gerd Moellmann committed
334
    emacs_ospeed = 15;
335
#else  /* not DOS_NT */
336 337
#ifdef HAVE_TERMIOS
      struct termios sg;
Jim Blandy's avatar
Jim Blandy committed
338

339
      sg.c_cflag = B9600;
340
      tcgetattr (fd, &sg);
Gerd Moellmann's avatar
Gerd Moellmann committed
341
      emacs_ospeed = cfgetospeed (&sg);
Dan Nicolaescu's avatar
Dan Nicolaescu committed
342
#else /* not TERMIOS */
343 344
#ifdef HAVE_TERMIO
      struct termio sg;
Jim Blandy's avatar
Jim Blandy committed
345

346
      sg.c_cflag = B9600;
347
#ifdef HAVE_TCATTR
348
      tcgetattr (fd, &sg);
349
#else
350
      ioctl (fd, TCGETA, &sg);
351
#endif
Gerd Moellmann's avatar
Gerd Moellmann committed
352
      emacs_ospeed = sg.c_cflag & CBAUD;
Dan Nicolaescu's avatar
Dan Nicolaescu committed
353
#else /* neither TERMIOS nor TERMIO */
Jim Blandy's avatar
Jim Blandy committed
354
      struct sgttyb sg;
355

Jim Blandy's avatar
Jim Blandy committed
356
      sg.sg_ospeed = B9600;
357
      if (ioctl (fd, TIOCGETP, &sg) < 0)
358
	abort ();
Gerd Moellmann's avatar
Gerd Moellmann committed
359
      emacs_ospeed = sg.sg_ospeed;
Jim Blandy's avatar
Jim Blandy committed
360
#endif /* not HAVE_TERMIO */
361
#endif /* not HAVE_TERMIOS */
362
#endif /* not DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
363
    }
364

Gerd Moellmann's avatar
Gerd Moellmann committed
365 366
  baud_rate = (emacs_ospeed < sizeof baud_convert / sizeof baud_convert[0]
	       ? baud_convert[emacs_ospeed] : 9600);
Jim Blandy's avatar
Jim Blandy committed
367 368 369 370
  if (baud_rate == 0)
    baud_rate = 1200;
}

371

Jim Blandy's avatar
Jim Blandy committed
372
/*ARGSUSED*/
Andreas Schwab's avatar
Andreas Schwab committed
373
void
Jim Blandy's avatar
Jim Blandy committed
374 375 376 377 378 379 380 381
set_exclusive_use (fd)
     int fd;
{
#ifdef FIOCLEX
  ioctl (fd, FIOCLEX, 0);
#endif
  /* Ok to do nothing if this feature does not exist */
}
382

Jim Blandy's avatar
Jim Blandy committed
383 384 385 386 387 388 389 390 391 392 393
#ifndef subprocesses

wait_without_blocking ()
{
  croak ("wait_without_blocking");
  synch_process_alive = 0;
}

#endif /* not subprocesses */

int wait_debugging;   /* Set nonzero to make following function work under dbx
394
			 (at least for bsd).  */
Jim Blandy's avatar
Jim Blandy committed
395 396 397 398 399 400 401 402

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) */

403
void
Jim Blandy's avatar
Jim Blandy committed
404 405 406 407 408 409
wait_for_termination (pid)
     int pid;
{
  while (1)
    {
#ifdef subprocesses
Dan Nicolaescu's avatar
Dan Nicolaescu committed
410
#if defined (BSD_SYSTEM) || defined (HPUX)
411 412 413 414 415 416 417 418 419
      /* 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))
420
	{
421 422 423 424 425 426 427 428
	  sigsetmask (SIGEMPTYMASK);
	  kill (getpid (), SIGCHLD);
	  break;
	}
      if (wait_debugging)
	sleep (1);
      else
	sigpause (SIGEMPTYMASK);
429
#else /* not BSD_SYSTEM, and not HPUX version >= 6 */
430
#ifdef POSIX_SIGNALS    /* would this work for GNU/Linux as well? */
431
      sigblock (sigmask (SIGCHLD));
432 433
      errno = 0;
      if (kill (pid, 0) == -1 && errno == ESRCH)
434 435 436 437
	{
	  sigunblock (sigmask (SIGCHLD));
	  break;
	}
438

439
      sigsuspend (&empty_mask);
440
#else /* not POSIX_SIGNALS */
441 442 443 444 445 446 447 448 449
#ifdef HAVE_SYSV_SIGPAUSE
      sighold (SIGCHLD);
      if (0 > kill (pid, 0))
	{
	  sigrelse (SIGCHLD);
	  break;
	}
      sigpause (SIGCHLD);
#else /* not HAVE_SYSV_SIGPAUSE */
450 451 452 453
#ifdef WINDOWSNT
      wait (0);
      break;
#else /* not WINDOWSNT */
454
      if (0 > kill (pid, 0))
Jim Blandy's avatar
Jim Blandy committed
455
	break;
456 457 458 459
      /* Using sleep instead of pause avoids timing error.
	 If the inferior dies just before the sleep,
	 we lose just one second.  */
      sleep (1);
460
#endif /* not WINDOWSNT */
461
#endif /* not HAVE_SYSV_SIGPAUSE */
462
#endif /* not POSIX_SIGNALS */
463
#endif /* not BSD_SYSTEM, and not HPUX version >= 6 */
Jim Blandy's avatar
Jim Blandy committed
464
#else /* not subprocesses */
465 466 467
#if __DJGPP__ > 1
      break;
#else /* not __DJGPP__ > 1 */
Jim Blandy's avatar
Jim Blandy committed
468 469 470
      if (kill (pid, 0) < 0)
	break;
      wait (0);
471
#endif /* not __DJGPP__ > 1*/
Jim Blandy's avatar
Jim Blandy committed
472 473 474 475 476 477 478 479 480 481
#endif /* not subprocesses */
    }
}

#ifdef subprocesses

/*
 *	flush any pending output
 *      (may flush input as well; it does not matter the way we use it)
 */
482

483
void
Jim Blandy's avatar
Jim Blandy committed
484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503
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
}
504

Jim Blandy's avatar
Jim Blandy committed
505 506 507 508 509
/*  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.  */

510
void
Jim Blandy's avatar
Jim Blandy committed
511 512 513
child_setup_tty (out)
     int out;
{
514
#ifndef DOS_NT
Jim Blandy's avatar
Jim Blandy committed
515 516 517
  struct emacs_tty s;

  EMACS_GET_TTY (out, &s);
Jim Blandy's avatar
Jim Blandy committed
518

519
#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
Jim Blandy's avatar
Jim Blandy committed
520 521
  s.main.c_oflag |= OPOST;	/* Enable output postprocessing */
  s.main.c_oflag &= ~ONLCR;	/* Disable map of NL to CR-NL on output */
522
#ifdef NLDLY
523 524 525
  /* http://lists.gnu.org/archive/html/emacs-devel/2008-05/msg00406.html
     Some versions of GNU Hurd do not have FFDLY?  */
#ifdef FFDLY
Jim Blandy's avatar
Jim Blandy committed
526 527
  s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
  				/* No output delays */
528 529 530 531
#else
  s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY);
  				/* No output delays */
#endif
532
#endif
Jim Blandy's avatar
Jim Blandy committed
533 534
  s.main.c_lflag &= ~ECHO;	/* Disable echo */
  s.main.c_lflag |= ISIG;	/* Enable signals */
535 536 537
#ifdef IUCLC
  s.main.c_iflag &= ~IUCLC;	/* Disable downcasing on input.  */
#endif
538 539 540
#ifdef ISTRIP
  s.main.c_iflag &= ~ISTRIP;	/* don't strip 8th bit on input */
#endif
541
#ifdef OLCUC
542 543
  s.main.c_oflag &= ~OLCUC;	/* Disable upcasing on output.  */
#endif
544
  s.main.c_oflag &= ~TAB3;	/* Disable tab expansion */
545
  s.main.c_cflag = (s.main.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
Jim Blandy's avatar
Jim Blandy committed
546 547
  s.main.c_lflag |= ICANON;	/* Enable erase/kill and eof processing */
  s.main.c_cc[VEOF] = 04;	/* insure that EOF is Control-D */
548 549
  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
550

Jim Blandy's avatar
Jim Blandy committed
551
#ifdef HPUX
Jim Blandy's avatar
Jim Blandy committed
552
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
553
#endif /* HPUX */
Jim Blandy's avatar
Jim Blandy committed
554

555 556 557
#ifdef SIGNALS_VIA_CHARACTERS
  /* the QUIT and INTR character are used in process_send_signal
     so set them here to something useful.  */
558
  if (s.main.c_cc[VQUIT] == CDISABLE)
559
    s.main.c_cc[VQUIT] = '\\'&037;	/* Control-\ */
560
  if (s.main.c_cc[VINTR] == CDISABLE)
561 562 563
    s.main.c_cc[VINTR] = 'C'&037;	/* Control-C */
#endif /* not SIGNALS_VIA_CHARACTERS */

Jim Blandy's avatar
Jim Blandy committed
564 565 566
#ifdef AIX
/* AIX enhanced edit loses NULs, so disable it */
#ifndef IBMR2AIX
Jim Blandy's avatar
Jim Blandy committed
567 568
  s.main.c_line = 0;
  s.main.c_iflag &= ~ASCEDIT;
Jim Blandy's avatar
Jim Blandy committed
569 570 571
#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
572 573
  s.main.c_iflag &= ~IGNBRK;
  s.main.c_iflag &= ~BRKINT;
574 575 576
  /* 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.  */
577
  s.main.c_cc[VEOL] = CDISABLE;
Jim Blandy's avatar
Jim Blandy committed
578
  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
Jim Blandy's avatar
Jim Blandy committed
579 580 581
#endif /* AIX */

#else /* not HAVE_TERMIO */
Jim Blandy's avatar
Jim Blandy committed
582 583 584

  s.main.sg_flags &= ~(ECHO | CRMOD | ANYP | ALLDELAY | RAW | LCASE
		       | CBREAK | TANDEM);
585
  s.main.sg_flags |= LPASS8;
Jim Blandy's avatar
Jim Blandy committed
586 587
  s.main.sg_erase = 0377;
  s.main.sg_kill = 0377;
588
  s.lmode = LLITOUT | s.lmode;        /* Don't strip 8th bit */
Jim Blandy's avatar
Jim Blandy committed
589

Jim Blandy's avatar
Jim Blandy committed
590 591
#endif /* not HAVE_TERMIO */

Jim Blandy's avatar
Jim Blandy committed
592
  EMACS_SET_TTY (out, &s, 0);
Jim Blandy's avatar
Jim Blandy committed
593

594
#endif /* not DOS_NT */
Jim Blandy's avatar
Jim Blandy committed
595 596 597
}

#endif /* subprocesses */
598

Jim Blandy's avatar
Jim Blandy committed
599 600 601 602
/* Record a signal code and the handler for it.  */
struct save_signal
{
  int code;
Andreas Schwab's avatar
Andreas Schwab committed
603
  SIGTYPE (*handler) P_ ((int));
Jim Blandy's avatar
Jim Blandy committed
604 605
};

Andreas Schwab's avatar
Andreas Schwab committed
606 607 608
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
609 610
/* Suspend the Emacs process; give terminal to its superior.  */

611
void
Jim Blandy's avatar
Jim Blandy committed
612 613
sys_suspend ()
{
614
#if defined (SIGTSTP) && !defined (MSDOS)
Jim Blandy's avatar
Jim Blandy committed
615

616
  {
617
    int pgrp = EMACS_GETPGRP (0);
618 619
    EMACS_KILLPG (pgrp, SIGTSTP);
  }
Jim Blandy's avatar
Jim Blandy committed
620 621 622 623 624

#else /* No SIGTSTP */
/* On a system where suspending is not implemented,
   instead fork a subshell and let it talk directly to the terminal
   while we wait.  */
625 626 627 628 629 630 631
  sys_subshell ();

#endif /* no SIGTSTP */
}

/* Fork a subshell.  */

632
void
633 634
sys_subshell ()
{
635
#ifdef DOS_NT	/* Demacs 1.1.2 91/10/20 Manabu Higashida */
636 637 638
  int st;
  char oldwd[MAXPATHLEN+1]; /* Fixed length is safe on MSDOS.  */
#endif
639
  int pid;
Jim Blandy's avatar
Jim Blandy committed
640
  struct save_signal saved_handlers[5];
641 642 643
  Lisp_Object dir;
  unsigned char *str = 0;
  int len;
Jim Blandy's avatar
Jim Blandy committed
644 645 646 647 648 649 650 651 652 653 654

  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

655 656 657 658
  /* Mentioning current_buffer->buffer would mean including buffer.h,
     which somehow wedges the hp compiler.  So instead...  */

  dir = intern ("default-directory");
659
  if (NILP (Fboundp (dir)))
660 661
    goto xyzzy;
  dir = Fsymbol_value (dir);
662
  if (!STRINGP (dir))
663 664 665
    goto xyzzy;

  dir = expand_and_dir_to_file (Funhandled_file_name_directory (dir), Qnil);
666 667 668
  str = (unsigned char *) alloca (SCHARS (dir) + 2);
  len = SCHARS (dir);
  bcopy (SDATA (dir), str, len);
669 670 671 672
  if (str[len - 1] != '/') str[len++] = '/';
  str[len] = 0;
 xyzzy:

673
#ifdef DOS_NT
674
  pid = 0;
675 676 677 678
#if __DJGPP__ > 1
  save_signal_handlers (saved_handlers);
  synch_process_alive = 1;
#endif /* __DJGPP__ > 1 */
679
#else
680
  pid = vfork ();
Jim Blandy's avatar
Jim Blandy committed
681 682
  if (pid == -1)
    error ("Can't spawn subshell");
683 684
#endif

Jim Blandy's avatar
Jim Blandy committed
685 686
  if (pid == 0)
    {
687
      char *sh = 0;
Jim Blandy's avatar
Jim Blandy committed
688

689
#ifdef DOS_NT    /* MW, Aug 1993 */
690
      getwd (oldwd);
691 692
      if (sh == 0)
	sh = (char *) egetenv ("SUSPEND");	/* KFS, 1994-12-14 */
693
#endif
694 695
      if (sh == 0)
	sh = (char *) egetenv ("SHELL");
Jim Blandy's avatar
Jim Blandy committed
696 697
      if (sh == 0)
	sh = "sh";
698

Jim Blandy's avatar
Jim Blandy committed
699
      /* Use our buffer's default directory for the subshell.  */
700
      if (str)
701
	chdir ((char *) str);
702

Jim Blandy's avatar
Jim Blandy committed
703 704 705
#ifdef subprocesses
      close_process_descs ();	/* Close Emacs's pipes/ptys */
#endif
706

707
#ifdef SET_EMACS_PRIORITY
708
      {
709
	extern EMACS_INT emacs_priority;
710

711
	if (emacs_priority < 0)
712 713 714 715
	  nice (-emacs_priority);
      }
#endif

716
#ifdef MSDOS    /* Demacs 1.1.2 91/10/20 Manabu Higashida */
717
      {
718 719
	char *epwd = getenv ("PWD");
	char old_pwd[MAXPATHLEN+1+4];
720 721

	/* If PWD is set, pass it with corrected value.  */
722
	if (epwd)
723
	  {
724
	    strcpy (old_pwd, epwd);
725 726 727 728 729 730
	    if (str[len - 1] == '/')
	      str[len - 1] = '\0';
	    setenv ("PWD", str, 1);
	  }
	st = system (sh);
	chdir (oldwd);
731
	if (epwd)
732 733
	  putenv (old_pwd);	/* restore previous value */
      }
734
#else /* not MSDOS */
735 736 737
#ifdef  WINDOWSNT
      /* Waits for process completion */
      pid = _spawnlp (_P_WAIT, sh, sh, NULL);
738
      chdir (oldwd);
739 740 741
      if (pid == -1)
	write (1, "Can't execute subshell", 22);
#else   /* not WINDOWSNT */
742
      execlp (sh, sh, (char *) 0);
Jim Blandy's avatar
Jim Blandy committed
743 744
      write (1, "Can't execute subshell", 22);
      _exit (1);
745
#endif  /* not WINDOWSNT */
746
#endif /* not MSDOS */
Jim Blandy's avatar
Jim Blandy committed
747 748
    }

749 750
  /* Do this now if we did not do it before.  */
#if !defined (MSDOS) || __DJGPP__ == 1
Jim Blandy's avatar
Jim Blandy committed
751
  save_signal_handlers (saved_handlers);
752
  synch_process_alive = 1;
753 754
#endif

755
#ifndef DOS_NT
Jim Blandy's avatar
Jim Blandy committed
756
  wait_for_termination (pid);
757
#endif
Jim Blandy's avatar
Jim Blandy committed
758
  restore_signal_handlers (saved_handlers);
759
  synch_process_alive = 0;
Jim Blandy's avatar
Jim Blandy committed
760 761
}

Andreas Schwab's avatar
Andreas Schwab committed
762
static void
Jim Blandy's avatar
Jim Blandy committed
763 764 765 766 767
save_signal_handlers (saved_handlers)
     struct save_signal *saved_handlers;
{
  while (saved_handlers->code)
    {
Joseph Arceneaux's avatar
Joseph Arceneaux committed
768
      saved_handlers->handler
Andreas Schwab's avatar
Andreas Schwab committed
769
	= (SIGTYPE (*) P_ ((int))) signal (saved_handlers->code, SIG_IGN);
Jim Blandy's avatar
Jim Blandy committed
770 771 772 773
      saved_handlers++;
    }
}

Andreas Schwab's avatar
Andreas Schwab committed
774
static void
Jim Blandy's avatar
Jim Blandy committed
775 776 777 778 779 780 781 782 783 784
restore_signal_handlers (saved_handlers)
     struct save_signal *saved_handlers;
{
  while (saved_handlers->code)
    {
      signal (saved_handlers->code, saved_handlers->handler);
      saved_handlers++;
    }
}

785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807
#ifndef SIGIO
/* If SIGIO is broken, don't do anything. */
void
init_sigio (int fd)
{
}

void
reset_sigio (int fd)
{
}

void
request_sigio (void)
{
}

void
unrequest_sigio (void)
{
}

#else
Jim Blandy's avatar
Jim Blandy committed
808 809
#ifdef F_SETFL

810
int old_fcntl_flags[MAXDESC];
Jim Blandy's avatar
Jim Blandy committed
811

812
void
813 814
init_sigio (fd)
     int fd;
Jim Blandy's avatar
Jim Blandy committed
815 816
{
#ifdef FASYNC
817 818
  old_fcntl_flags[fd] = fcntl (fd, F_GETFL, 0) & ~FASYNC;
  fcntl (fd, F_SETFL, old_fcntl_flags[fd] | FASYNC);
Jim Blandy's avatar
Jim Blandy committed
819
#endif
820
  interrupts_deferred = 0;
Jim Blandy's avatar
Jim Blandy committed
821 822
}

Andreas Schwab's avatar
Andreas Schwab committed
823
void
Karoly Lorentey's avatar
Karoly Lorentey committed
824 825
reset_sigio (fd)
     int fd;
Jim Blandy's avatar
Jim Blandy committed
826
{
827
#ifdef FASYNC
828
  fcntl (fd, F_SETFL, old_fcntl_flags[fd]);
829
#endif
Jim Blandy's avatar
Jim Blandy committed
830 831
}

832
#ifdef FASYNC		/* F_SETFL does not imply existence of FASYNC */
833
/* XXX Uhm, FASYNC is not used anymore here. */
834
/* XXX Yeah, but you need it for SIGIO, don't you? */
Jim Blandy's avatar
Jim Blandy committed
835

836
void
Jim Blandy's avatar
Jim Blandy committed
837 838
request_sigio ()
{
839
  if (noninteractive)
840 841
    return;

Jim Blandy's avatar
Jim Blandy committed
842
#ifdef SIGWINCH
Jim Blandy's avatar
Jim Blandy committed
843
  sigunblock (sigmask (SIGWINCH));
Jim Blandy's avatar
Jim Blandy committed
844
#endif
Karoly Lorentey's avatar
Karoly Lorentey committed
845
  sigunblock (sigmask (SIGIO));
Jim Blandy's avatar
Jim Blandy committed
846 847 848 849

  interrupts_deferred = 0;
}

850
void
Karoly Lorentey's avatar
Karoly Lorentey committed
851
unrequest_sigio (void)
852
{ 
853 854 855 856 857
  if (noninteractive)
    return;

#if 0 /* XXX What's wrong with blocking SIGIO under X?  */
  if (x_display_list)
858
    return;
859
#endif
860

Jim Blandy's avatar
Jim Blandy committed
861
#ifdef SIGWINCH
Jim Blandy's avatar
Jim Blandy committed
862
  sigblock (sigmask (SIGWINCH));
Jim Blandy's avatar
Jim Blandy committed
863
#endif
Karoly Lorentey's avatar
Karoly Lorentey committed
864
  sigblock (sigmask (SIGIO));
Jim Blandy's avatar
Jim Blandy committed
865 866 867 868
  interrupts_deferred = 1;
}

#else /* no FASYNC */
869
#ifndef MSDOS
870

871
void
Jim Blandy's avatar
Jim Blandy committed
872 873
request_sigio ()
{
874
  if (noninteractive || read_socket_hook)
875 876
    return;

Jim Blandy's avatar
Jim Blandy committed
877 878
  croak ("request_sigio");
}
879

880
void
Jim Blandy's avatar
Jim Blandy committed
881 882
unrequest_sigio ()
{
883
  if (noninteractive || read_socket_hook)
884 885
    return;

Jim Blandy's avatar
Jim Blandy committed
886 887
  croak ("unrequest_sigio");
}