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/* Interfaces to system-dependent kernel and library entries.
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   Copyright (C) 1985, 1986, 1987, 1988, 1992 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
the Free Software Foundation; either version 1, or (at your option)
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>

#include "config.h"
#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>

extern int errno;
#ifndef VMS
extern char *sys_errlist[];
#endif

#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
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#ifndef USG5
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#include <fcntl.h>
#endif
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#endif
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#endif /* not 4.1 bsd */

/* Get DGUX definition for FASYNC - DJB */
#ifdef DGUX
#include <sys/file.h>
#endif /* DGUX */

#include <sys/ioctl.h>
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#include "systty.h"
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#ifdef BSD
#ifdef BSD4_1
#include <wait.h>
#else /* not 4.1 */
#include <sys/wait.h>
#endif /* not 4.1 */
#endif /* BSD */

#ifdef BROKEN_TIOCGWINSZ
#undef TIOCGWINSZ
#endif

#ifdef USG
#include <sys/utsname.h>
#include <string.h>
#ifndef MEMORY_IN_STRING_H
#include <memory.h>
#endif
#ifdef TIOCGWINSZ
#ifdef NEED_SIOCTL
#include <sys/sioctl.h>
#endif
#ifdef NEED_PTEM_H
#include <sys/stream.h>
#include <sys/ptem.h>
#endif
#endif /* TIOCGWINSZ */
#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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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.
   Under Unix, this is always left zero;
   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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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;
    ioctl (0, TIOCFLUSH, &zero);
  }
#else /* not Apollo */
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  EMACS_GET_TTY (input_fd, &buf);
  EMACS_SET_TTY (input_fd, &buf, 0);
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#endif /* not Apollo */
#endif /* not VMS */
}

#ifdef SIGTSTP

stuff_char (c)
     char c;
{
/* Should perhaps error if in batch mode */
#ifdef TIOCSTI
  ioctl (0, TIOCSTI, &c);
#else /* no TIOCSTI */
  error ("Cannot stuff terminal input characters in this version of Unix.");
#endif /* no TIOCSTI */
}

#endif /* SIGTSTP */

init_baud_rate ()
{
  if (noninteractive)
    ospeed = 0;
  else
    {
#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 = (sg.c_cflag & ~CBAUD) | B9600;
      tcgetattr (0, &sg);
      ospeed = sg.c_cflag & CBAUD;
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#else /* neither VMS nor TERMIOS */
#ifdef HAVE_TERMIO
      struct termio sg;
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      sg.c_cflag = (sg.c_cflag & ~CBAUD) | B9600;
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#ifdef HAVE_TCATTR
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      tcgetattr (0, &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;
      ioctl (0, TIOCGETP, &sg);
      ospeed = sg.sg_ospeed;
#endif /* not HAVE_TERMIO */
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#endif /* not HAVE_TERMIOS */
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#endif /* not VMS */
    }
   
  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 */
}

#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 */

      /* Exit if the process has terminated.  */
      if (!synch_process_alive)
	break;
      /* Otherwise wait 1 second or until a signal comes in.  */
      signal (SIGALRM, wait_for_termination_signal);
      alarm (1);
      pause ();
      alarm (0);
      signal (SIGALRM, SIG_IGN);
#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
}

#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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  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 */
  s.main.c_oflag &= ~(NLDLY|CRDLY|TABDLY|BSDLY|VTDLY|FFDLY);
  				/* No output delays */
  s.main.c_lflag &= ~ECHO;	/* Disable echo */
  s.main.c_lflag |= ISIG;	/* Enable signals */
  s.main.c_iflag &= ~IUCLC;	/* Disable map of upper case to lower on
				   input */
  s.main.c_oflag &= ~OLCUC;	/* Disable map of lower case to upper on
				   output */
#if 0
  /* Said to be unnecesary:  */
  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[VQUIT] = 0377;
  s.main.c_cc[VINTR] = 0377;
  s.main.c_cc[VEOL] = 0377;
  s.main.c_lflag &= ~ISIG;
  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);
  s.main.sg_erase = 0377;
  s.main.sg_kill = 0377;

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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 */
}
#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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}

/* 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
#ifdef SIGTSTP

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  EMACS_KILLPG (getpgrp (0), 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.  */
  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;

      sh = (char *) egetenv ("SHELL");
      if (sh == 0)
	sh = "sh";
      /* 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");
	/* Can't use NULL */
	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 PRIO_PROCESS
      {
	extern int emacs_priority;

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

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      execlp (sh, sh, 0);
      write (1, "Can't execute subshell", 22);
      _exit (1);
    }

  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);

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

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

reset_sigio ()
{
  unrequest_sigio ();
}

#ifdef FASYNC		/* F_SETFL does not imply existance of FASYNC */

request_sigio ()
{
#ifdef SIGWINCH
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  sigunblock (sigmask (SIGWINCH));
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#endif
  fcntl (0, F_SETFL, old_fcntl_flags | FASYNC);

  interrupts_deferred = 0;
}

unrequest_sigio ()
{
#ifdef SIGWINCH
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  sigblock (sigmask (SIGWINCH));
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#endif
  fcntl (0, F_SETFL, old_fcntl_flags);
  interrupts_deferred = 1;
}

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

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

unrequest_sigio ()
{
  int off = 0;

  ioctl (0, FIOASYNC, &off);
  interrupts_deferred = 1;
}

#else /* not FASYNC, not STRIDE */
 
request_sigio ()
{
  croak ("request_sigio");
}
 
unrequest_sigio ()
{
  croak ("unrequest_sigio");
}
 
#endif /* STRIDE */
#endif /* FASYNC */
#endif /* F_SETFL */
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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
  /* I give up - I hope you have the BSD ioctls.  */
  if (ioctl (fd, TIOCGETP, &settings->main) < 0)
    return -1;

#endif
#endif
#endif

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

  /* How about a struct tchars and a wordful of lmode bits?  */
#ifdef TIOCGETC
  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
  /* 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."  */
  for (;;)
    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);
	if (memcmp (&new, &settings->main, sizeof (new)))
	  continue;
	else
	  break;
      }

#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
  /* I give up - I hope you have the BSD ioctls.  */
  if (ioctl (fd, (waitp) ? TIOCSETP : TIOCSETN, &settings->main) < 0)
    return -1;

#endif
#endif
#endif

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

  /* How about a struct tchars and a wordful of lmode bits?  */
#ifdef TIOCGETC
  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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#ifdef F_SETOWN
int old_fcntl_owner;
#endif /* F_SETOWN */

/* 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
 
#ifdef TIOCGLTC
static struct ltchars new_ltchars = {-1,-1,-1,-1,-1,-1};
#endif
#ifdef TIOCGETC
  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.");
897
#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));
903
#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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  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
      tty.main.c_iflag &= ~IEXTEN;	/* Disable other editing characters.  */
#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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#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$M_TTSYNC;
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      else
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	tty.main.tt_char &= ~TT$M_TTSYNC;
      tty.main.tt2_char |= TT2$M_PASTHRU | TT2$M_XON;
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#else /* not VMS (BSD, that is) */
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      tty.main.sg_flags &= ~(ECHO | CRMOD | XTABS);
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      if (meta_key)
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	tty.main.sg_flags |= ANYP;
      tty.main.sg_flags |= interrupt_input ? RAW : CBREAK;
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#endif /* not VMS (BSD, that is) */
#endif /* not HAVE_TERMIO */

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      /* If going to use CBREAK mode, we must request C-g to interrupt
	 and turn off start and stop chars, etc.  If not going to use
	 CBREAK mode, do this anyway so as to turn off local flow
	 control for user coming over network on 4.2; in this case,
	 only t_stopc and t_startc really matter.  */
#ifndef HAVE_TERMIO
#ifdef TIOCGETC
      /* Note: if not using CBREAK mode, it makes no difference how we
	 set this */
      tty.tchars = new_tchars;
      tty.tchars.t_intrc = quit_char;
      if (flow_control)
	{
	  tty.tchars.t_startc = '\021';
	  tty.tchars.t_stopc = '\023';
	}

/* LPASS8 is new in 4.3, and makes cbreak mode provide all 8 bits.  */
#ifndef LPASS8
#define LPASS8 0
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#endif
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#ifdef BSD4_1
#define LNOFLSH 0100000
#endif

      tty.lmode = LDECCTQ | LLITOUT | LPASS8 | LNOFLSH | old_tty.lmode;
      
#ifdef BSD4_1
      lmode = tty.lmode;
#endif

#endif /* TIOCGETC */
#endif /* not HAVE_TERMIO */

#ifdef TIOCGLTC
      tty.ltchars = new_ltchars;
#endif /* TIOCGLTC */

      EMACS_SET_TTY (input_fd, &tty, 0);
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      /* This code added to insure that, if flow-control is not to be used,
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	 we have an unlocked terminal at the start. */
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#ifdef TCXONC
      if (!flow_control) ioctl (0, TCXONC, 1);
#endif
#ifndef APOLLO
#ifdef TIOCSTART
      if (!flow_control) ioctl (0, TIOCSTART, 0);
#endif
#endif

#ifdef AIX
      hft_init ();
#ifdef IBMR2AIX
      {
	/* IBM's HFT device usually thinks a ^J should be LF/CR.  We need it
	   to be only LF.  This is the way that is done. */
	struct termio tty;

	if (ioctl (1, HFTGETID, &tty) != -1)
	  write (1, "\033[20l", 5);
      }
#endif
#endif

#ifdef VMS
/*  Appears to do nothing when in PASTHRU mode.
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      SYS$QIOW (0, input_fd, IO$_SETMODE|IO$M_OUTBAND, 0, 0, 0,
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		interrupt_signal, oob_chars, 0, 0, 0, 0);
*/
      queue_kbd_input (0);
#endif /* VMS */
    }

#ifdef F_SETFL
#ifdef F_GETOWN		/* F_SETFL does not imply existance of F_GETOWN */
  if (interrupt_input)
    {
      old_fcntl_owner = fcntl (0, F_GETOWN, 0);
      fcntl (0, F_SETOWN, getpid ());
      init_sigio ();
    }
#endif /* F_GETOWN */
#endif /* F_SETFL */

#ifdef BSD4_1
  if (interrupt_input)
    init_sigio ();
#endif

#ifdef VMS  /* VMS sometimes has this symbol but lacks setvbuf.  */
#undef _IOFBF
#endif
#ifdef _IOFBF
  /* This symbol is defined on recent USG systems.
     Someone says without this call USG won't really buffer the file
     even with a call to setbuf. */
  setvbuf (stdout, _sobuf, _IOFBF, sizeof _sobuf);
#else
  setbuf (stdout, _sobuf);
#endif
  set_terminal_modes ();
  if (term_initted && no_redraw_on_reenter)
    {
      if (display_completed)
	direct_output_forward_char (0);
    }
  else
    {
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      frame_garbaged = 1;
#ifdef MULTI_FRAME
      if (FRAMEP (Vterminal_frame))
	FRAME_GARBAGED_P (XFRAME (Vterminal_frame)) = 1;
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#endif
    }
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  term_initted = 1;
}

/* Return nonzero if safe to use tabs in output.
   At the time this is called, init_sys_modes has not been done yet.  */
   
tabs_safe_p ()
{
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  struct emacs_tty tty;

  EMACS_GET_TTY (input_fd, &tty);
  return EMACS_TTY_TABS_OK (&tty);
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}

/* Get terminal size from system.
   Store number of lines into *heightp and width into *widthp.
   If zero or a negative number is stored, the value is not valid.  */

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get_frame_size (widthp, heightp)
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     int *widthp, *heightp;
{

#ifdef TIOCGWINSZ
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  /* BSD-style.  */
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  struct winsize size;
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  if (ioctl (input_fd, TIOCGWINSZ, &size) == -1)
    *widthp = *heightp = 0;
  else
    {
      *widthp = size.ws_col;
      *heightp = size.ws_row;
    }

#else
#ifdef TIOCGSIZE

  /* SunOS - style.  */
  struct ttysize size;  

  if (ioctl (input_fd, TIOCGSIZE, &size) == -1)
    *widthp = *heightp = 0;
  else
    {
      *widthp = size.ts_cols;
      *heightp = size.ts_lines;
    }

#else
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#ifdef VMS
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  struct sensemode tty;
  
  SYS$QIOW (0, input_fd, IO$_SENSEMODE, &tty, 0, 0,
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	    &tty.class, 12, 0, 0, 0, 0);
  *widthp = tty.scr_wid;
  *heightp = tty.scr_len;
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#else /* system doesn't know size */
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  *widthp = 0;
  *heightp = 0;
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#endif /* not VMS */
#endif /* not SunOS-style */
#endif /* not BSD-style */
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}
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/* Prepare the terminal for exiting Emacs; move the cursor to the
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   bottom of the frame, turn off interrupt-driven I/O, etc.  */
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reset_sys_modes ()
{
  if (noninteractive)
    {
      fflush (stdout);
      return;
    }
  if (!term_initted)
    return;
  if (read_socket_hook || !EQ (Vwindow_system, Qnil))
    return;
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  cursor_to (FRAME_HEIGHT (selected_frame) - 1, 0);
  clear_end_of_line (FRAME_WIDTH (selected_frame));
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  /* clear_end_of_line may move the cursor */
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  cursor_to (FRAME_HEIGHT (selected_frame) - 1, 0);
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#ifdef IBMR2AIX
  {
    /* HFT devices normally use ^J as a LF/CR.  We forced it to 
       do the LF only.  Now, we need to reset it. */
    struct termio tty;

    if (ioctl (1, HFTGETID, &tty) != -1)
      write (1, "\033[20h", 5);
  }
#endif

  reset_terminal_modes ();
  fflush (stdout);
#ifdef BSD
#ifndef BSD4_1
  /* Avoid possible loss of output when changing terminal modes.  */
  fsync (fileno (stdout));
#endif
#endif
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#ifdef F_SETFL
#ifdef F_SETOWN		/* F_SETFL does not imply existance of F_SETOWN */
  if (interrupt_input)
    {
      reset_sigio ();
      fcntl (0, F_SETOWN, old_fcntl_owner);
    }
#endif /* F_SETOWN */
#endif /* F_SETFL */
#ifdef BSD4_1
  if (interrupt_input)
    reset_sigio ();
#endif /* BSD4_1 */
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  while (EMACS_SET_TTY (input_fd, &old_tty, 0) < 0 && errno == EINTR)
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    ;
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#ifdef AIX
  hft_reset ();
#endif
}

#ifdef HAVE_PTYS

/* Set up the proper status flags for use of a pty.  */

setup_pty (fd)
     int fd;
{
  /* I'm told that TOICREMOTE does not mean control chars
     "can't be sent" but rather that they don't have
     input-editing or signaling effects.
     That should be good, because we have other ways
     to do those things in Emacs.
     However, telnet mode seems not to work on 4.2.
     So TIOCREMOTE is turned off now. */

  /* Under hp-ux, if TIOCREMOTE is turned on, some calls
     will hang.  In particular, the "timeout" feature (which
     causes a read to return if there is no data available)
     does this.  Also it is known that telnet mode will hang
     in such a way that Emacs must be stopped (perhaps this
     is the same problem).
     
     If TIOCREMOTE is turned off, then there is a bug in
     hp-ux which sometimes loses data.  Apparently the
     code which blocks the master process when the internal
     buffer fills up does not work.  Other than this,
     though, everything else seems to work fine.
     
     Since the latter lossage is more benign, we may as well
     lose that way.  -- cph */
#ifdef FIONBIO
#ifdef SYSV_PTYS
  {
    int on = 1;
    ioctl (fd, FIONBIO, &on);
  }
#endif
#endif
#ifdef IBMRTAIX
  /* On AIX, the parent gets SIGHUP when a pty attached child dies.  So, we */
  /* ignore SIGHUP once we've started a child on a pty.  Note that this may */
  /* cause EMACS not to die when it should, i.e., when its own controlling  */
  /* tty goes away.  I've complained to the AIX developers, and they may    */
  /* change this behavior, but I'm not going to hold my breath.             */
  signal (SIGHUP, SIG_IGN);
#endif
}
#endif /* HAVE_PTYS */

#ifdef VMS

/* Assigning an input channel is done at the start of Emacs execution.
   This is called each time Emacs is resumed, also, but does nothing
   because input_chain is no longer zero.  */

init_vms_input ()
{
  int status;
  
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  if (input_fd == 0)
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    {
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      status = SYS$ASSIGN (&input_dsc, &input_fd, 0, 0);
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      if (! (status & 1))
	LIB$STOP (status);
    }
}

/* Deassigning the input channel is done before exiting.  */

stop_vms_input ()
{
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  return SYS$DASSGN (input_fd);
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}

short input_buffer;

/* Request reading one character into the keyboard buffer.
   This is done as soon as the buffer becomes empty.  */

queue_kbd_input ()
{
  int status;
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  extern kbd_input_ast ();

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  waiting_for_ast = 0;
  stop_input = 0;
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  status = SYS$QIO (0, input_fd, IO$_READVBLK,
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		    &input_iosb, kbd_input_ast, 1,
		    &input_buffer, 1, 0, terminator_mask, 0, 0);
}

int input_count;

/* Ast routine that is called when keyboard input comes in
   in accord with the SYS$QIO above.  */

kbd_input_ast ()
{
  register int c = -1;
  int old_errno = errno;
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  extern EMACS_TIME *input_available_clear_time;
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  if (waiting_for_ast)
    SYS$SETEF (input_ef);
  waiting_for_ast = 0;
  input_count++;
#ifdef ASTDEBUG
  if (input_count == 25)
    exit (1);
  printf ("Ast # %d,", input_count);
  printf (" iosb = %x, %x, %x, %x",
	  input_iosb.offset, input_iosb.status, input_iosb.termlen,
	  input_iosb.term);
#endif
  if (input_iosb.offset)
    {
      c = input_buffer;
#ifdef ASTDEBUG
      printf (", char = 0%o", c);
#endif
    }
#ifdef ASTDEBUG
  printf ("\n");
  fflush (stdout);
  sleep (1);
#endif
  if (! stop_input)
    queue_kbd_input ();
  if (c >= 0)
    {
      struct input_event e;
      e.kind = ascii_keystroke;
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      XSET (e.code, Lisp_Int, c);
#ifdef MULTI_FRAME
      XSET(e.frame_or_window, Lisp_Frame, selected_frame);
#else
      e.frame_or_window = Qnil;
#endif
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      kbd_buffer_store_event (&e);
    }
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  if (input_available_clear_time)
    EMACS_SET_SECS_USECS (*input_available_clear_time, 0, 0);
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  errno = old_errno;
}

/* Wait until there is something in kbd_buffer.  */

wait_for_kbd_input ()
{
  extern int have_process_input, process_exited;

  /* If already something, avoid doing system calls.  */
  if (detect_input_pending ())
    {
      return;
    }
  /* Clear a flag, and tell ast routine above to set it.  */
  SYS$CLREF (input_ef);
  waiting_for_ast = 1;
  /* Check for timing error: ast happened while we were doing that.  */
  if (!detect_input_pending ())
    {
      /* No timing error: wait for flag to be set.  */
      set_waiting_for_input (0);
      SYS$WFLOR (input_ef, input_eflist);
      clear_waiting_for_input (0);
      if (!detect_input_pending ())
	/* Check for subprocess input availability */
	{
	  int dsp = have_process_input || process_exited;

	  SYS$CLREF (process_ef);
	  if (have_process_input)
	    process_command_input ();
	  if (process_exited)
	    process_exit ();
	  if (dsp)
	    {
	      update_mode_lines++;
	      redisplay_preserve_echo_area ();
	    }
	}
    }
  waiting_for_ast = 0;
}

/* Get rid of any pending QIO, when we are about to suspend
   or when we want to throw away pending input.
   We wait for a positive sign that the AST routine has run
   and therefore there is no I/O request queued when we return.
   SYS$SETAST is used to avoid a timing error.  */

end_kbd_input ()
{
#ifdef ASTDEBUG
  printf ("At end_kbd_input.\n");
  fflush (stdout);
  sleep (1);
#endif
  if (LIB$AST_IN_PROG ())  /* Don't wait if suspending from kbd_buffer_store_event! */
    {
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      SYS$CANCEL (input_fd);
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      return;
    }

  SYS$SETAST (0);
  /* Clear a flag, and tell ast routine above to set it.  */
  SYS$CLREF (input_ef);
  waiting_for_ast = 1;
  stop_input = 1;
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  SYS$CANCEL (input_fd);
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  SYS$SETAST (1);
  SYS$WAITFR (input_ef);
  waiting_for_ast = 0;
}

/* Wait for either input available or time interval expiry.  */

input_wait_timeout (timeval)
     int timeval;		/* Time to wait, in seconds */
{
  int time [2];
  static int zero = 0;
  static int large = -10000000;

  LIB$EMUL (&timeval, &large, &zero, time); 	  /* Convert to VMS format */

  /* If already something, avoid doing system calls.  */
  if (detect_input_pending ())
    {
      return;
    }
  /* Clear a flag, and tell ast routine above to set it.  */
  SYS$CLREF (input_ef);
  waiting_for_ast = 1;
  /* Check for timing error: ast happened while we were doing that.  */
  if (!detect_input_pending ())
    {
      /* No timing error: wait for flag to be set.  */
      SYS$CANTIM (1, 0);
      if (SYS$SETIMR (timer_ef, time, 0, 1) & 1) /* Set timer */
	SYS$WFLOR (timer_ef, timer_eflist);	  /* Wait for timer expiry or input */
    }
  waiting_for_ast = 0;
}

/* The standard `sleep' routine works some other way
   and it stops working if you have ever quit out of it.
   This one continues to work.  */

sys_sleep (timeval)
     int timeval;
{
  int time [2];
  static int zero = 0;
  static int large = -10000000;
  
  LIB$EMUL (&timeval, &large, &zero, time); 	  /* Convert to VMS format */

  SYS$CANTIM (1, 0);
  if (SYS$SETIMR (timer_ef, time, 0, 1) & 1) /* Set timer */
    SYS$WAITFR (timer_ef);	  /* Wait for timer expiry only */
}

init_sigio ()
{
  request_sigio ();
}

reset_sigio ()
{
  unrequest_sigio ();
}

request_sigio ()
{
  croak ("request sigio");
}

unrequest_sigio ()
{
  croak ("unrequest sigio");
}

#endif /* VMS */

/* Note that VMS compiler won't accept defined (CANNOT_DUMP).  */
#ifndef CANNOT_DUMP
#define NEED_STARTS
#endif

#ifndef SYSTEM_MALLOC
#ifndef NEED_STARTS
#define NEED_STARTS
#endif
#endif

#ifdef NEED_STARTS
/* Some systems that cannot dump also cannot implement these.  */

/*
 *	Return the address of the start of the text segment prior to
 *	doing an unexec.  After unexec the return value is undefined.
 *	See crt0.c for further explanation and _start.
 *
 */

#ifndef CANNOT_UNEXEC
char *
start_of_text ()
{
#ifdef TEXT_START
  return ((char *) TEXT_START);
#else
#ifdef GOULD
  extern csrt ();
  return ((char *) csrt);
#else /* not GOULD */
  extern int _start ();
  return ((char *) _start);
#endif /* GOULD */
#endif /* TEXT_START */
}
#endif /* not CANNOT_UNEXEC */

/*
 *	Return the address of the start of the data segment prior to
 *	doing an unexec.  After unexec the return value is undefined.
 *	See crt0.c for further information and definition of data_start.
 *
 *	Apparently, on BSD systems this is etext at startup.  On
 *	USG systems (swapping) this is highly mmu dependent and
 *	is also dependent on whether or not the program is running
 *	with shared text.  Generally there is a (possibly large