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/* Interfaces to system-dependent kernel and library entries.
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   Copyright (C) 1985, 86, 87, 88, 93, 94 Free Software Foundation, Inc.
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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
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the Free Software Foundation; either version 2, or (at your option)
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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
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */


#include <signal.h>
#include <setjmp.h>

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#include <config.h>
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#include "lisp.h"
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#include "blockinput.h"
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#undef NULL

#define min(x,y) ((x) > (y) ? (y) : (x))

/* In this file, open, read and write refer to the system calls,
   not our sugared interfaces  sys_open, sys_read and sys_write.
   Contrariwise, for systems where we use the system calls directly,
   define sys_read, etc. here as aliases for them.  */
#ifndef read
#define sys_read read
#define sys_write write
#endif /* `read' is not a macro */

#undef read
#undef write

#ifndef close
#define sys_close close
#else 
#undef close
#endif

#ifndef open
#define sys_open open
#else /* `open' is a macro */
#undef open
#endif /* `open' is a macro */

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

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#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>

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#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>
#endif

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extern int errno;

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#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
#define	MAXIOSIZE ( 32 * PAGESIZE )	/* Don't I/O more than 32 blocks at a time */
#endif /* VMS */

#ifndef BSD4_1
#ifdef BSD /* this is done this way to avoid defined (BSD) || defined (USG)
	      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 */
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#ifdef BROKEN_FASYNC
/* On some systems (DGUX comes to mind real fast) FASYNC causes
   background writes to the terminal to stop all processes in the
   process group when invoked under the csh (and probably any shell
   with job control). This stops Emacs dead in its tracks when coming
   up under X11. */
#undef FASYNC
#endif
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#ifndef MSDOS
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#include <sys/ioctl.h>
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#endif
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#include "systty.h"
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#include "syswait.h"
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#ifdef BROKEN_TIOCGWINSZ
#undef TIOCGWINSZ
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#undef TIOCSWINSZ
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#endif

#ifdef USG
#include <sys/utsname.h>
#include <string.h>
#ifndef MEMORY_IN_STRING_H
#include <memory.h>
#endif
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#if defined (TIOCGWINSZ) || defined (ISC4_0)
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#ifdef NEED_SIOCTL
#include <sys/sioctl.h>
#endif
#ifdef NEED_PTEM_H
#include <sys/stream.h>
#include <sys/ptem.h>
#endif
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#endif /* TIOCGWINSZ or ISC4_0 */
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#endif /* USG */

extern int quit_char;

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#include "frame.h"
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#include "window.h"
#include "termhooks.h"
#include "termchar.h"
#include "termopts.h"
#include "dispextern.h"
#include "process.h"

#ifdef NONSYSTEM_DIR_LIBRARY
#include "ndir.h"
#endif /* NONSYSTEM_DIR_LIBRARY */

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#include "syssignal.h"
#include "systime.h"
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/* 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

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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

extern short ospeed;

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/* The file descriptor for Emacs's input terminal.
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   Under Unix, this is normaly zero except when using X;
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   under VMS, we place the input channel number here.
   This allows us to write more code that works for both VMS and Unix.  */
static int input_fd;
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/* 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.  */
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discard_tty_input ()
{
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  struct emacs_tty buf;
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  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 ();
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  SYS$QIOW (0, input_fd, IO$_READVBLK|IO$M_PURGE, input_iosb, 0, 0,
	    &buf.main, 0, 0, terminator_mask, 0, 0);
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  queue_kbd_input ();
#else /* not VMS */
#ifdef APOLLO
  {
    int zero = 0;
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    ioctl (input_fd, TIOCFLUSH, &zero);
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  }
#else /* not Apollo */
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#ifdef MSDOS	/* Demacs 1.1.1 91/10/16 HIRANO Satoshi */
  while (dos_keyread () != -1)
  	;
#else /* not MSDOS */
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  EMACS_GET_TTY (input_fd, &buf);
  EMACS_SET_TTY (input_fd, &buf, 0);
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#endif /* not MSDOS */
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#endif /* not Apollo */
#endif /* not VMS */
}

#ifdef SIGTSTP

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

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stuff_char (c)
     char c;
{
/* Should perhaps error if in batch mode */
#ifdef TIOCSTI
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  ioctl (input_fd, TIOCSTI, &c);
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#else /* no TIOCSTI */
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  error ("Cannot stuff terminal input characters in this version of Unix");
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#endif /* no TIOCSTI */
}

#endif /* SIGTSTP */
255

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init_baud_rate ()
{
  if (noninteractive)
    ospeed = 0;
  else
    {
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#ifdef MSDOS
    ospeed = 15;
#else
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#ifdef VMS
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      struct sensemode sg;

      SYS$QIOW (0, input_fd, IO$_SENSEMODE, &sg, 0, 0,
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		&sg.class, 12, 0, 0, 0, 0 );
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      ospeed = sg.xmit_baud;
#else /* not VMS */
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#ifdef HAVE_TERMIOS
      struct termios sg;
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      sg.c_cflag = B9600;
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      tcgetattr (input_fd, &sg);
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      ospeed = cfgetospeed (&sg);
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#else /* neither VMS nor TERMIOS */
#ifdef HAVE_TERMIO
      struct termio sg;
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      sg.c_cflag = B9600;
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#ifdef HAVE_TCATTR
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      tcgetattr (input_fd, &sg);
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#else
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      ioctl (input_fd, TCGETA, &sg);
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#endif
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      ospeed = sg.c_cflag & CBAUD;
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#else /* neither VMS nor TERMIOS nor TERMIO */
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      struct sgttyb sg;
      
      sg.sg_ospeed = B9600;
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      if (ioctl (input_fd, TIOCGETP, &sg) < 0)
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	abort ();
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      ospeed = sg.sg_ospeed;
#endif /* not HAVE_TERMIO */
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#endif /* not HAVE_TERMIOS */
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#endif /* not VMS */
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#endif /* not MSDOS */
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    }
   
  baud_rate = (ospeed < sizeof baud_convert / sizeof baud_convert[0]
 	       ? baud_convert[ospeed] : 9600);
  if (baud_rate == 0)
    baud_rate = 1200;
}

/*ARGSUSED*/
set_exclusive_use (fd)
     int fd;
{
#ifdef FIOCLEX
  ioctl (fd, FIOCLEX, 0);
#endif
  /* Ok to do nothing if this feature does not exist */
}
317

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#ifndef subprocesses

wait_without_blocking ()
{
#ifdef BSD
  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
		         (at least for bsd).  */

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) */

wait_for_termination (pid)
     int pid;
{
  while (1)
    {
#ifdef subprocesses
#ifdef VMS
      int status;

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      status = SYS$FORCEX (&pid, 0, 0);
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      break;
#else /* not VMS */
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#if defined (BSD) || (defined (HPUX) && !defined (HPUX_5))
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      /* 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))
        {
	  sigsetmask (SIGEMPTYMASK);
	  kill (getpid (), SIGCHLD);
	  break;
	}
      if (wait_debugging)
	sleep (1);
      else
	sigpause (SIGEMPTYMASK);
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#else /* not BSD, and not HPUX version >= 6 */
#if defined (UNIPLUS)
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      if (0 > kill (pid, 0))
	break;
      wait (0);
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#else /* neither BSD nor UNIPLUS: random sysV */
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#ifdef POSIX_SIGNALS	/* would this work for LINUX as well? */
      sigblock (sigmask (SIGCHLD));
      if (0 > kill (pid, 0))
	{
	  sigunblock (sigmask (SIGCHLD));
	  break;
	}
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      sigpause (SIGEMPTYMASK);
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#else /* not POSIX_SIGNALS */
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#ifdef HAVE_SYSV_SIGPAUSE
      sighold (SIGCHLD);
      if (0 > kill (pid, 0))
	{
	  sigrelse (SIGCHLD);
	  break;
	}
      sigpause (SIGCHLD);
#else /* not HAVE_SYSV_SIGPAUSE */
      if (0 > kill (pid, 0))
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	break;
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      /* Using sleep instead of pause avoids timing error.
	 If the inferior dies just before the sleep,
	 we lose just one second.  */
      sleep (1);
#endif /* not HAVE_SYSV_SIGPAUSE */
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#endif /* not POSIX_SIGNALS */
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#endif /* not UNIPLUS */
#endif /* not BSD, and not HPUX version >= 6 */
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#endif /* not VMS */
#else /* not subprocesses */
#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 */
#endif /* not subprocesses */
    }
}

#ifdef subprocesses

/*
 *	flush any pending output
 *      (may flush input as well; it does not matter the way we use it)
 */
 
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
}
450

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#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.  */

child_setup_tty (out)
     int out;
{
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#ifndef MSDOS
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  struct emacs_tty s;

  EMACS_GET_TTY (out, &s);
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#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
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  s.main.c_oflag |= OPOST;	/* Enable output postprocessing */
  s.main.c_oflag &= ~ONLCR;	/* Disable map of NL to CR-NL on output */
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#ifdef NLDLY
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  s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
  				/* No output delays */
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#endif
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  s.main.c_lflag &= ~ECHO;	/* Disable echo */
  s.main.c_lflag |= ISIG;	/* Enable signals */
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#ifdef IUCLC
  s.main.c_iflag &= ~IUCLC;	/* Disable downcasing on input.  */
#endif
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#ifdef OLCUC
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  s.main.c_oflag &= ~OLCUC;	/* Disable upcasing on output.  */
#endif
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  s.main.c_cflag = (s.main.c_cflag & ~CSIZE) | CS8; /* Don't strip 8th bit */
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#if 0
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  /* Said to be unnecessary:  */
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  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 */
  s.main.c_cc[VERASE] = 0377;	/* disable erase processing */
  s.main.c_cc[VKILL] = 0377;	/* disable kill processing */

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#ifdef HPUX
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  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
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#endif /* HPUX */
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#ifdef AIX
/* AIX enhanced edit loses NULs, so disable it */
#ifndef IBMR2AIX
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  s.main.c_line = 0;
  s.main.c_iflag &= ~ASCEDIT;
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#endif
  /* Also, PTY overloads NUL and BREAK.
     don't ignore break, but don't signal either, so it looks like NUL.  */
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  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;
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#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;
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  s.main.c_lflag &= ~ISIG;
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#endif /* no TIOCGPGRP or no TIOCGLTC or no TIOCGETC */
  s.main.c_cc[VEOL] = 0377;
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  s.main.c_cflag = (s.main.c_cflag & ~CBAUD) | B9600; /* baud rate sanity */
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#endif /* AIX */

#else /* not HAVE_TERMIO */
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  s.main.sg_flags &= ~(ECHO | CRMOD | ANYP | ALLDELAY | RAW | LCASE
		       | CBREAK | TANDEM);
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  s.main.sg_flags |= LPASS8;
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  s.main.sg_erase = 0377;
  s.main.sg_kill = 0377;
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  s.lmode = LLITOUT | s.lmode;        /* Don't strip 8th bit */
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#endif /* not HAVE_TERMIO */

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  EMACS_SET_TTY (out, &s, 0);
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#ifdef BSD4_1
  if (interrupt_input)
    reset_sigio ();
#endif /* BSD4_1 */
#ifdef RTU
  {
    int zero = 0;
    ioctl (out, FIOASYNC, &zero);
  }
#endif /* RTU */
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#endif /* not MSDOS */
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}
#endif /* not VMS */

#endif /* subprocesses */

/*ARGSUSED*/
setpgrp_of_tty (pid)
     int pid;
{
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  EMACS_SET_TTY_PGRP (input_fd, &pid);
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}
560

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/* Record a signal code and the handler for it.  */
struct save_signal
{
  int code;
  SIGTYPE (*handler) ();
};

/* Suspend the Emacs process; give terminal to its superior.  */

sys_suspend ()
{
#ifdef VMS
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  /* "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 ();

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  xfree (fpid_string);		/* On VMS, this was malloc'd */
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  if (parent_id && parent_id != 0xffffffff)
    {
      SIGTYPE (*oldsig)() = (int) signal (SIGINT, SIG_IGN);
      int status = LIB$ATTACH (&parent_id) & 1;
      signal (SIGINT, oldsig);
      return status;
    }
  else
    {
      struct {
	int	l;
	char	*a;
      } d_prompt;
      d_prompt.l = sizeof ("Emacs: ");		/* Our special prompt */
      d_prompt.a = "Emacs: ";			/* Just a reminder */
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      LIB$SPAWN (0, 0, 0, 0, 0, 0, 0, 0, 0, 0, &d_prompt, 0);
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      return 1;
    }
  return -1;
#else
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#if defined(SIGTSTP) && !defined(MSDOS)
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  {
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    int pgrp = EMACS_GETPGRP (0);
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    EMACS_KILLPG (pgrp, SIGTSTP);
  }
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#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.  */
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  sys_subshell ();

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

/* Fork a subshell.  */

sys_subshell ()
{
#ifndef VMS
#ifdef MSDOS	/* Demacs 1.1.2 91/10/20 Manabu Higashida */
  int st;
  char oldwd[MAXPATHLEN+1]; /* Fixed length is safe on MSDOS.  */
#endif
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  int pid = fork ();
  struct save_signal saved_handlers[5];

  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

  if (pid == -1)
    error ("Can't spawn subshell");
  if (pid == 0)
    {
      char *sh;

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#ifdef MSDOS	/* MW, Aug 1993 */
      getwd (oldwd);
#endif
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      sh = (char *) egetenv ("SHELL");
      if (sh == 0)
	sh = "sh";
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      /* Use our buffer's default directory for the subshell.  */
      {
	Lisp_Object dir;
	unsigned char *str;
	int len;

	/* mentioning current_buffer->buffer would mean including buffer.h,
	   which somehow wedges the hp compiler.  So instead... */

	dir = intern ("default-directory");
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	/* Can't use NILP */
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	if (XFASTINT (Fboundp (dir)) == XFASTINT (Qnil))
	  goto xyzzy;
	dir = Fsymbol_value (dir);
	if (XTYPE (dir) != Lisp_String)
	  goto xyzzy;

	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;
	chdir (str);
      }
    xyzzy:
#ifdef subprocesses
      close_process_descs ();	/* Close Emacs's pipes/ptys */
#endif
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#ifdef SET_EMACS_PRIORITY
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      {
	extern int emacs_priority;

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	if (emacs_priority < 0)
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	  nice (-emacs_priority);
      }
#endif

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#ifdef MSDOS	/* Demacs 1.1.2 91/10/20 Manabu Higashida */
      st = system (sh);
      chdir (oldwd);
      if (st)
        report_file_error ("Can't execute subshell", Fcons (build_string (sh), Qnil));
#else /* not MSDOS */
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      execlp (sh, sh, 0);
      write (1, "Can't execute subshell", 22);
      _exit (1);
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#endif /* not MSDOS */
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    }

  save_signal_handlers (saved_handlers);
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  synch_process_alive = 1;
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  wait_for_termination (pid);
  restore_signal_handlers (saved_handlers);
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#endif /* !VMS */
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}

save_signal_handlers (saved_handlers)
     struct save_signal *saved_handlers;
{
  while (saved_handlers->code)
    {
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      saved_handlers->handler
	= (SIGTYPE (*) ()) signal (saved_handlers->code, SIG_IGN);
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      saved_handlers++;
    }
}

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;

init_sigio ()
{
#ifdef FASYNC
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  old_fcntl_flags = fcntl (input_fd, F_GETFL, 0) & ~FASYNC;
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#endif
  request_sigio ();
}

reset_sigio ()
{
  unrequest_sigio ();
}

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#ifdef FASYNC		/* F_SETFL does not imply existence of FASYNC */
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request_sigio ()
{
#ifdef SIGWINCH
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  sigunblock (sigmask (SIGWINCH));
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#endif
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  fcntl (input_fd, F_SETFL, old_fcntl_flags | FASYNC);
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  interrupts_deferred = 0;
}

unrequest_sigio ()
{
#ifdef SIGWINCH
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  sigblock (sigmask (SIGWINCH));
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#endif
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  fcntl (input_fd, F_SETFL, old_fcntl_flags);
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  interrupts_deferred = 1;
}

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

request_sigio ()
{
  int on = 1;
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  ioctl (input_fd, FIOASYNC, &on);
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  interrupts_deferred = 0;
}

unrequest_sigio ()
{
  int off = 0;

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  ioctl (input_fd, FIOASYNC, &off);
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  interrupts_deferred = 1;
}

#else /* not FASYNC, not STRIDE */
 
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#ifdef _CX_UX

#include <termios.h>

request_sigio ()
{
  int on = 1;
  sigset_t st;

  sigemptyset(&st);
  sigaddset(&st, SIGIO);
  ioctl (input_fd, FIOASYNC, &on);
  interrupts_deferred = 0;
  sigprocmask(SIG_UNBLOCK, &st, (sigset_t *)0);
}

unrequest_sigio ()
{
  int off = 0;

  ioctl (input_fd, FIOASYNC, &off);
  interrupts_deferred = 1;
}

#else /* ! _CX_UX */

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request_sigio ()
{
  croak ("request_sigio");
}
 
unrequest_sigio ()
{
  croak ("unrequest_sigio");
}
 
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#endif /* _CX_UX */
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#endif /* STRIDE */
#endif /* FASYNC */
#endif /* F_SETFL */
848

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/* Saving and restoring the process group of Emacs's terminal.  */

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#ifdef BSD_PGRPS
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/* The process group of which Emacs was a member when it initially
   started.

   If Emacs was in its own process group (i.e. inherited_pgroup ==
   getpid ()), then we know we're running under a shell with job
   control (Emacs would never be run as part of a pipeline).
   Everything is fine.

   If Emacs was not in its own process group, then we know we're
   running under a shell (or a caller) that doesn't know how to
   separate itself from Emacs (like sh).  Emacs must be in its own
   process group in order to receive SIGIO correctly.  In this
   situation, we put ourselves in our own pgroup, forcibly set the
   tty's pgroup to our pgroup, and make sure to restore and reinstate
   the tty's pgroup just like any other terminal setting.  If
   inherited_group was not the tty's pgroup, then we'll get a
   SIGTTmumble when we try to change the tty's pgroup, and a CONT if
   it goes foreground in the future, which is what should happen.  */
int inherited_pgroup;

/* Split off the foreground process group to Emacs alone.
   When we are in the foreground, but not started in our own process
   group, redirect the TTY to point to our own process group.  We need
   to be in our own process group to receive SIGIO properly.  */
narrow_foreground_group ()
{
  int me = getpid ();

  setpgrp (0, inherited_pgroup);
  if (inherited_pgroup != me)
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    EMACS_SET_TTY_PGRP (input_fd, &me);
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  setpgrp (0, me);
}

/* Set the tty to our original foreground group.  */
widen_foreground_group ()
{
  if (inherited_pgroup != getpid ())
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    EMACS_SET_TTY_PGRP (input_fd, &inherited_pgroup);
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  setpgrp (0, inherited_pgroup);
}

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#endif /* BSD_PGRPS */
896

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/* Getting and setting emacs_tty structures.  */

/* Set *TC to the parameters associated with the terminal FD.
   Return zero if all's well, or -1 if we ran into an error we
   couldn't deal with.  */
int
emacs_get_tty (fd, settings)
     int fd;
     struct emacs_tty *settings;
{
  /* Retrieve the primary parameters - baud rate, character size, etcetera.  */
#ifdef HAVE_TCATTR
  /* We have those nifty POSIX tcmumbleattr functions.  */
  if (tcgetattr (fd, &settings->main) < 0)
    return -1;

#else
#ifdef HAVE_TERMIO
  /* The SYSV-style interface?  */
  if (ioctl (fd, TCGETA, &settings->main) < 0)
    return -1;

#else
#ifdef VMS
  /* Vehemently Monstrous System?  :-)  */
  if (! (SYS$QIOW (0, fd, IO$_SENSEMODE, settings, 0, 0,
		   &settings->main.class, 12, 0, 0, 0, 0)
	 & 1))
    return -1;

#else
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#ifndef MSDOS
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  /* I give up - I hope you have the BSD ioctls.  */
  if (ioctl (fd, TIOCGETP, &settings->main) < 0)
    return -1;
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#endif /* not MSDOS */
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#endif
#endif
#endif

  /* Suivant - Do we have to get struct ltchars data?  */
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#ifdef HAVE_LTCHARS
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  if (ioctl (fd, TIOCGLTC, &settings->ltchars) < 0)
    return -1;
#endif

  /* How about a struct tchars and a wordful of lmode bits?  */
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#ifdef HAVE_TCHARS
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  if (ioctl (fd, TIOCGETC, &settings->tchars) < 0
      || ioctl (fd, TIOCLGET, &settings->lmode) < 0)
    return -1;
#endif

  /* We have survived the tempest.  */
  return 0;
}


/* Set the parameters of the tty on FD according to the contents of
   *SETTINGS.  If WAITP is non-zero, we wait for all queued output to
   be written before making the change; otherwise, we forget any
   queued input and make the change immediately.
   Return 0 if all went well, and -1 if anything failed.  */
int
emacs_set_tty (fd, settings, waitp)
     int fd;
     struct emacs_tty *settings;
     int waitp;
{
  /* Set the primary parameters - baud rate, character size, etcetera.  */
#ifdef HAVE_TCATTR
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  int i;
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  /* We have those nifty POSIX tcmumbleattr functions.
     William J. Smith <wjs@wiis.wang.com> writes:
     "POSIX 1003.1 defines tcsetattr() to return success if it was
     able to perform any of the requested actions, even if some
     of the requested actions could not be performed.
     We must read settings back to ensure tty setup properly.
     AIX requires this to keep tty from hanging occasionally."  */
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  /* This make sure that we don't loop indefinitely in here.  */
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  for (i = 0 ; i < 10 ; i++)
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    if (tcsetattr (fd, waitp ? TCSAFLUSH : TCSADRAIN, &settings->main) < 0)
      {
	if (errno == EINTR)
	  continue;
	else
	  return -1;
      }
    else
      {
	struct termios new;

	/* Get the current settings, and see if they're what we asked for.  */
	tcgetattr (fd, &new);
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	/* We cannot use memcmp on the whole structure here because under
	 * aix386 the termios structure has some reserved field that may
	 * not be filled in.
	 */
	if (   new.c_iflag == settings->main.c_iflag
	    && new.c_oflag == settings->main.c_oflag
	    && new.c_cflag == settings->main.c_cflag
	    && new.c_lflag == settings->main.c_lflag
	    && memcmp(new.c_cc, settings->main.c_cc, NCCS) == 0)
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	  break;
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	else
	  continue;
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      }

#else
#ifdef HAVE_TERMIO
  /* The SYSV-style interface?  */
  if (ioctl (fd, waitp ? TCSETAW : TCSETAF, &settings->main) < 0)
    return -1;

#else
#ifdef VMS
  /* Vehemently Monstrous System?  :-)  */
  if (! (SYS$QIOW (0, fd, IO$_SETMODE, &input_iosb, 0, 0,
		   &settings->main.class, 12, 0, 0, 0, 0)
	 & 1))
    return -1;

#else
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#ifndef MSDOS
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  /* I give up - I hope you have the BSD ioctls.  */
  if (ioctl (fd, (waitp) ? TIOCSETP : TIOCSETN, &settings->main) < 0)
    return -1;
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#endif /* not MSDOS */
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#endif
#endif
#endif

  /* Suivant - Do we have to get struct ltchars data?  */
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  if (ioctl (fd, TIOCSLTC, &settings->ltchars) < 0)
    return -1;
#endif

  /* How about a struct tchars and a wordful of lmode bits?  */
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#ifdef HAVE_TCHARS
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  if (ioctl (fd, TIOCSETC, &settings->tchars) < 0
      || ioctl (fd, TIOCLSET, &settings->lmode) < 0)
    return -1;
#endif
  
  /* We have survived the tempest.  */
  return 0;
}

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/* The initial tty mode bits */
struct emacs_tty old_tty;
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int term_initted;		/* 1 if outer tty status has been recorded */

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#ifdef BSD4_1
/* BSD 4.1 needs to keep track of the lmode bits in order to start
   sigio.  */
int lmode;
#endif

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#ifndef F_SETOWN_BUG
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#ifdef F_SETOWN
int old_fcntl_owner;
#endif /* F_SETOWN */
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#endif /* F_SETOWN_BUG */
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/* This may also be defined in stdio,
   but if so, this does no harm,
   and using the same name avoids wasting the other one's space.  */

#if defined (USG) || defined (DGUX)
unsigned char _sobuf[BUFSIZ+8];
#else
char _sobuf[BUFSIZ];
#endif
 
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#ifdef HAVE_LTCHARS
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static struct ltchars new_ltchars = {-1,-1,-1,-1,-1,-1};
#endif
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#ifdef HAVE_TCHARS
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  static struct tchars new_tchars = {-1,-1,-1,-1,-1,-1};
#endif 

init_sys_modes ()
{
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  struct emacs_tty tty;

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#ifdef VMS
#if 0
  static int oob_chars[2] = {0, 1 << 7}; /* catch C-g's */
  extern int (*interrupt_signal) ();
#endif
#endif

  if (noninteractive)
    return;

#ifdef VMS
  if (!input_ef)
    input_ef = get_kbd_event_flag ();
    /* LIB$GET_EF (&input_ef); */
  SYS$CLREF (input_ef);
  waiting_for_ast = 0;
  if (!timer_ef)
    timer_ef = get_timer_event_flag ();
    /* LIB$GET_EF (&timer_ef); */
  SYS$CLREF (timer_ef);
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#if 0
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  if (!process_ef)
    {
      LIB$GET_EF (&process_ef);
      SYS$CLREF (process_ef);
    }
  if (input_ef / 32 != process_ef / 32)
    croak ("Input and process event flags in different clusters.");
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#endif
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  if (input_ef / 32 != timer_ef / 32)
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    croak ("Input and timer event flags in different clusters.");
#if 0
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  input_eflist = ((unsigned) 1 << (input_ef % 32)) |
    ((unsigned) 1 << (process_ef % 32));
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#endif
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  timer_eflist = ((unsigned) 1 << (input_ef % 32)) |
    ((unsigned) 1 << (timer_ef % 32));
#ifndef VMS4_4
  sys_access_reinit ();
#endif
#endif /* not VMS */
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#ifdef BSD_PGRPS
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  if (! read_socket_hook && EQ (Vwindow_system, Qnil))
    narrow_foreground_group ();
#endif

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  EMACS_GET_TTY (input_fd, &old_tty);

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  if (!read_socket_hook && EQ (Vwindow_system, Qnil))
    {
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      tty = old_tty;
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#if defined (HAVE_TERMIO) || defined (HAVE_TERMIOS)
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      tty.main.c_iflag |= (IGNBRK);	/* Ignore break condition */
      tty.main.c_iflag &= ~ICRNL;	/* Disable map of CR to NL on input */
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#ifdef ISTRIP
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      tty.main.c_iflag &= ~ISTRIP;	/* don't strip 8th bit on input */
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#endif
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      tty.main.c_lflag &= ~ECHO;	/* Disable echo */
      tty.main.c_lflag &= ~ICANON;	/* Disable erase/kill processing */
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#ifdef IEXTEN
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      tty.main.c_lflag &= ~IEXTEN;	/* Disable other editing characters.  */
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#endif
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      tty.main.c_lflag |= ISIG;	/* Enable signals */
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      if (flow_control)
	{
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	  tty.main.c_iflag |= IXON;	/* Enable start/stop output control */
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#ifdef IXANY
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	  tty.main.c_iflag &= ~IXANY;
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#endif /* IXANY */
	}
      else
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	tty.main.c_iflag &= ~IXON;	/* Disable start/stop output control */
      tty.main.c_oflag &= ~ONLCR;	/* Disable map of NL to CR-NL 
					   on output */
      tty.main.c_oflag &= ~TAB3;	/* Disable tab expansion */
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#ifdef CS8
      if (meta_key)
	{
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	  tty.main.c_cflag |= CS8;	/* allow 8th bit on input */
	  tty.main.c_cflag &= ~PARENB;/* Don't check parity */
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	}
#endif
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      tty.main.c_cc[VINTR] = quit_char;	/* C-g (usually) gives SIGINT */
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      /* Set up C-g for both SIGQUIT and SIGINT.
	 We don't know which we will get, but we handle both alike
	 so which one it really gives us does not matter.  */
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      tty.main.c_cc[VQUIT] = quit_char;
      tty.main.c_cc[VMIN] = 1;	/* Input should wait for at least 1 char */
      tty.main.c_cc[VTIME] = 0;	/* no matter how long that takes.  */
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#ifdef VSWTCH
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      tty.main.c_cc[VSWTCH] = CDISABLE;	/* Turn off shell layering use
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					   of C-z */
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#endif /* VSWTCH */
#if defined (mips) || defined (HAVE_TCATTR)
#ifdef VSUSP
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      tty.main.c_cc[VSUSP] = CDISABLE;	/* Turn off mips handling of C-z.  */
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#endif /* VSUSP */
#ifdef V_DSUSP
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      tty.main.c_cc[V_DSUSP] = CDISABLE; /* Turn off mips handling of C-y.  */
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#endif /* V_DSUSP */
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#ifdef VDSUSP /* Some systems have VDSUSP, some have V_DSUSP.  */
      tty.main.c_cc[VDSUSP] = CDISABLE;
#endif /* VDSUSP */
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#ifdef VLNEXT
      tty.main.c_cc[VLNEXT] = CDISABLE;
#endif /* VLNEXT */
#ifdef VREPRINT
      tty.main.c_cc[VREPRINT] = CDISABLE;
#endif /* VREPRINT */
#ifdef VWERASE
      tty.main.c_cc[VWERASE] = CDISABLE;
#endif /* VWERASE */
#ifdef VDISCARD
      tty.main.c_cc[VDISCARD] = CDISABLE;
#endif /* VDISCARD */
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#endif /* mips or HAVE_TCATTR */
#ifdef AIX
#ifndef IBMR2AIX
      /* AIX enhanced edit loses NULs, so disable it */
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      tty.main.c_line = 0;
      tty.main.c_iflag &= ~ASCEDIT;
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#else
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      tty.main.c_cc[VSTRT] = 255;
      tty.main.c_cc[VSTOP] = 255;
      tty.main.c_cc[VSUSP] = 255;
      tty.main.c_cc[VDSUSP] = 255;
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#endif /* IBMR2AIX */
      /* Also, PTY overloads NUL and BREAK.
	 don't ignore break, but don't signal either, so it looks like NUL.
	 This really serves a purpose only if running in an XTERM window
	 or via TELNET or the like, but does no harm elsewhere.  */
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      tty.main.c_iflag &= ~IGNBRK;
      tty.main.c_iflag &= ~BRKINT;
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#endif
#else /* if not HAVE_TERMIO */
#ifdef VMS
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      tty.main.tt_char |= TT$M_NOECHO;
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      if (meta_key)
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	tty.main.tt_char |= TT$M_EIGHTBIT;
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      if (flow_control)
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	tty.main.tt_char |= TT$M_TTSYNC;
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      else