/* 
   Copyright (C) 1995 Free Software Foundation, Inc.
   Written by Michael I. Bushnell, p/BSG.

   This file is part of the GNU Hurd.

   The GNU Hurd 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 2, or (at
   your option) any later version.

   The GNU Hurd 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 this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA. */

#include "term.h"
#include <sys/stat.h>
#include <unistd.h>
#include <sys/types.h>
#include <string.h>
#include <fcntl.h>
#include <hurd/trivfs.h>
#include <cthreads.h>
#include <hurd.h>
#include "ourmsg_U.h"

#undef ECHO
#undef MDMBUF
#undef TOSTOP
#undef FLUSHO
#undef PENDIN
#undef NOFLSH

#include "term_S.h"
#include "tioctl_S.h"
#include <sys/ioctl.h>

#define TTYDEFCHARS
#include <sys/ttydefaults.h>

/* Count of active opens */
int nperopens;

/* io_async requests */
struct async_req
{
  mach_port_t notify;
  struct async_req *next;
};
struct async_req *async_requests;

mach_port_t async_icky_id;
mach_port_t async_id;
struct port_info *cttyid;
int foreground_id;

struct winsize window_size;

static void call_asyncs (void);

/* Attach this on the hook of any protid that is a ctty. */
struct protid_hook
{
  int refcnt;
  pid_t pid, pgrp;
};

void
init_users ()
{
  cttyid = ports_allocate_port (term_bucket, sizeof (struct port_info),
				cttyid_class);
  mach_port_allocate (mach_task_self (), MACH_PORT_RIGHT_RECEIVE, 
		      &async_icky_id);
  mach_port_allocate (mach_task_self (), MACH_PORT_RIGHT_RECEIVE, &async_id);
}
  

static error_t
open_hook (struct trivfs_control *cntl,
	   uid_t *uids, u_int nuids,
	   uid_t *gids, u_int ngids,
	   int flags)
{
  int cancel = 0;
  error_t err;
  
  if ((flags & (O_READ|O_WRITE)) == 0)
    return 0;

  if (cntl == ptyctl)
    return pty_open_hook (cntl, uids, nuids, gids, ngids, flags);

  mutex_lock (&global_lock);

  if (!(termflags & TTY_OPEN))
    {
      bzero (&termstate, sizeof termstate);

      /* This is different from BSD: we don't turn on ISTRIP,
	 and we use CS8 rather than CS7|PARENB.  */
      termstate.c_iflag |= BRKINT | ICRNL | IMAXBEL | IXON | IXANY;
      termstate.c_oflag |= OPOST | ONLCR | OXTABS;
      termstate.c_lflag |= (ECHO | ICANON | ISIG | IEXTEN 
			    | ECHOE|ECHOKE|ECHOCTL);
      termstate.c_cflag |= CREAD | CS8 | HUPCL;
  
      bcopy (ttydefchars, termstate.c_cc, NCCS);

      termflags |= NO_OWNER;
    }
  else if (termflags & EXCL_USE)
    {
      mutex_unlock (&global_lock);
      return EBUSY;
    }

  /* Wait for carrier to turn on. */
  while (((termflags & NO_CARRIER) && !(termstate.c_cflag & CLOCAL))
	 && !(flags & O_NONBLOCK)
	 && !cancel)
    {
      err = (*bottom->assert_dtr) ();
      if (err)
	{
	  mutex_unlock (&global_lock);
	  return err;
	}
      cancel = hurd_condition_wait (&carrier_alert, &global_lock);
    }
      
  if ((termflags & NO_CARRIER) && !(termstate.c_cflag & CLOCAL))
    {
      mutex_unlock (&global_lock);
      return EWOULDBLOCK;
    }
  if (cancel)
    {
      mutex_unlock (&global_lock);
      return EINTR;
    }
  
  termflags |= TTY_OPEN;
  if (!(termstate.c_cflag & CIGNORE))
    (*bottom->set_bits) ();


  mutex_unlock (&global_lock);
  return 0;
}
error_t (*trivfs_check_open_hook) (struct trivfs_control *, uid_t *,
				   u_int, uid_t *, u_int, int)
     = open_hook;

static error_t
pi_create_hook (struct trivfs_protid *cred)
{
  if (cred->pi.class == pty_class)
    return 0;
  
  mutex_lock (&global_lock);
  if (cred->hook)
    ((struct protid_hook *)cred->hook)->refcnt++;
  mutex_unlock (&global_lock);
  
  return 0;
}
error_t (*trivfs_protid_create_hook) (struct trivfs_protid *) = pi_create_hook;

static void
pi_destroy_hook (struct trivfs_protid *cred)
{
  if (cred->pi.class == pty_class)
    return 0;

  mutex_lock (&global_lock);
  if (cred->hook && !--((struct protid_hook *)cred->hook)->refcnt)
    free (cred->hook);
  mutex_unlock (&global_lock);
}
void (*trivfs_protid_destroy_hook) (struct trivfs_protid *) = pi_destroy_hook;

static error_t
po_create_hook (struct trivfs_peropen *po)
{
  if (po->cntl == ptyctl)
    return pty_po_create_hook (po);

  mutex_lock (&global_lock);
  nperopens++;
  if (po->openmodes & O_ASYNC)
    termflags |= ICKY_ASYNC;
  mutex_unlock (&global_lock);
  return 0;
}
error_t (*trivfs_peropen_create_hook) (struct trivfs_peropen *) =
     po_create_hook;

static void 
po_destroy_hook (struct trivfs_peropen *po)
{
  if (po->cntl == ptyctl)
    return pty_po_destroy_hook (po);

  mutex_lock (&global_lock);
  nperopens--;
  if (!nperopens)
    {
      /* Empty queues */
      clear_queue (inputq);
      clear_queue (rawq);
      (*bottom->notice_input_flushed) ();

      drain_output ();
      
      /* Possibly drop carrier */
      if ((termstate.c_cflag & HUPCL) || (termflags & NO_CARRIER))
	(*bottom->desert_dtr) ();

      termflags &= ~TTY_OPEN;
    }
  mutex_unlock (&global_lock);
}
void (*trivfs_peropen_destroy_hook) (struct trivfs_peropen *) 
     = po_destroy_hook;

/* Tell if CRED can do foreground terminal operations */
static inline int
fg_p (struct trivfs_protid *cred)
{
  struct protid_hook *hook = cred->hook;
  
  if (!hook || (termflags & NO_OWNER))
    return 1;
  
  if (hook->pid == foreground_id
      || hook->pgrp == -foreground_id)
    return 1;
  
  return 0;
}

void
trivfs_modify_stat (struct trivfs_protid *cred, struct stat *st)
{
  st->st_blksize = 512;
  st->st_fstype = FSTYPE_TERM;
  st->st_fsid = getpid ();
  st->st_ino = 0;
  st->st_mode &= ~S_IFMT;
  st->st_mode |= S_IFCHR;
}

/* Implement term_getctty as described in <hurd/term.defs>. */
kern_return_t
S_term_getctty (mach_port_t arg,
		mach_port_t *id,
		mach_msg_type_name_t *idtype)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket,
						  arg, tty_class);
  error_t err;
  
  if (!cred)
    return EOPNOTSUPP;

  mutex_lock (&global_lock);

  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err = EBADF;
  else
    {
      *id = ports_get_right (cttyid);
      *idtype = MACH_MSG_TYPE_MAKE_SEND;
      err = 0;
    }
  ports_port_deref (cred);
  mutex_unlock (&global_lock);
  return err;
}

/* Implement termctty_open_terminal as described in <hurd/term.defs>. */
kern_return_t
S_termctty_open_terminal (mach_port_t arg,
			  int flags,
			  mach_port_t *result,
			  mach_msg_type_name_t *resulttype)
{
  error_t err;
  mach_port_t new_realnode;
  struct trivfs_protid *newcred;
  struct port_info *pi = ports_lookup_port (term_bucket, arg, cttyid_class);

  if (!pi)
    return EOPNOTSUPP;

  assert (pi == cttyid);

  err = io_restrict_auth (termctl->underlying, &new_realnode, 0, 0, 0, 0);

  if (!err)
    {
      err = trivfs_open (termctl, 0, 0, 0, 0, flags, new_realnode, &newcred);
      if (!err)
	{
	  *result = ports_get_right (newcred);
	  *resulttype = MACH_MSG_TYPE_MAKE_SEND;
	  ports_port_deref (newcred);
	}
    }

  ports_port_deref (pi);
  return err;
}

/* Implement term_become_ctty as described in <hurd/term.defs>. */
kern_return_t
S_term_open_ctty (mach_port_t arg,
		    pid_t pid,
		    pid_t pgrp,
		    mach_port_t *newpt,
		    mach_msg_type_name_t *newpttype)
{
  error_t err;
  struct trivfs_protid *newcred;
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, arg, tty_class);
  
  if (!cred)
    return EOPNOTSUPP;

  mutex_lock (&global_lock);

  if (!cred->po->openmodes & (O_READ|O_WRITE))
    {
      mutex_unlock (&global_lock);
      err = EBADF;
    }
  else
    {
      mutex_unlock (&global_lock);
      err = trivfs_protid_dup (cred, &newcred);

      if (!err)
	{
	  struct protid_hook *hook = malloc (sizeof (struct protid_hook));

	  hook->pid = pid;
	  hook->pgrp = pgrp;
	  hook->refcnt = 1;

	  if (newcred->hook)
	    /* We inherited CRED's hook, get rid of our ref to it. */
	    pi_destroy_hook (newcred);
	  newcred->hook = hook;

	  *newpt = ports_get_right (newcred);
	  *newpttype = MACH_MSG_TYPE_MAKE_SEND;

	  ports_port_deref (newcred);
	}
    }
  
  ports_port_deref (cred);

  return err;
}

/* Called for user writes to the terminal as described
   in <hurd/io.defs>. */
error_t
trivfs_S_io_write (struct trivfs_protid *cred,
		   mach_port_t reply,
		   mach_msg_type_name_t replytype,
		   char *data,
		   u_int datalen,
		   off_t offset,
		   int *amt)
{
  int i;
  int cancel;
  
  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class == pty_class)
    return pty_io_write (cred, data, datalen, amt);

  mutex_lock (&global_lock);

  /* Check for errors first. */

  if ((cred->po->openmodes & O_WRITE) == 0)
    {
      mutex_unlock (&global_lock);
      return EBADF;
    }
  
  if ((termstate.c_lflag & TOSTOP) && !fg_p (cred))
    {
      mutex_unlock (&global_lock);
      return EBACKGROUND;
    }
  
  if ((termflags & NO_CARRIER) && !(termstate.c_cflag & CLOCAL))
    {
      mutex_unlock (&global_lock);
      return EIO;
  
    }

  cancel = 0;
  for (i = 0; i < datalen; i++)
    {
      while (!qavail (outputq) && !cancel)
	{
	  (*bottom->start_output) ();
	  if (!qavail (outputq))
	    cancel = hurd_condition_wait (outputq->wait, &global_lock);
	}
      if (cancel)
	break;

      write_character (data[i]);
    }

  *amt = i;

  (*bottom->start_output) ();

  trivfs_set_mtime (termctl);

  call_asyncs ();

  mutex_unlock (&global_lock);

  return ((cancel && datalen && !*amt) ? EINTR : 0);
}

/* Called for user reads from the terminal. */
error_t
trivfs_S_io_read (struct trivfs_protid *cred,
		  mach_port_t reply,
		  mach_msg_type_name_t replytype,
		  char **data,
		  u_int *datalen,
		  off_t offset,
		  int amount)
{
  int cancel;
  int i, max;
  char *cp;
  int avail;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class == pty_class)
    return pty_io_read (cred, data, datalen, amount);

  mutex_lock (&global_lock);
  
  if ((cred->po->openmodes & O_READ) == 0)
    {
      mutex_unlock (&global_lock);
      return EBADF;
    }
  
  if (!fg_p (cred))
    {
      mutex_unlock (&global_lock);
      return EBACKGROUND;
    }

  while (!qsize (inputq))
    {
      if ((termflags & NO_CARRIER) && !(termstate.c_cflag & CLOCAL))
	{
	  /* Return EOF, Posix.1 7.1.1.10. */
	  mutex_unlock (&global_lock);
	  *datalen = 0;
	  return 0;
	}
      
      if (cred->po->openmodes & O_NONBLOCK)
	{
	  mutex_unlock (&global_lock);
	  return EWOULDBLOCK;
	}

      if (hurd_condition_wait (inputq->wait, &global_lock))
	{
	  mutex_unlock (&global_lock);
	  return EINTR;
	}
    }

  avail = qsize (inputq);
  if (remote_input_mode)
    avail--;

  max = (amount < avail) ? amount : avail;

  if (max > *datalen)
    vm_allocate (mach_task_self (), (vm_address_t *)data, max, 1);
  
  cancel = 0;
  cp = *data;
  for (i = 0; i < max; i++)
    {
      char c = dequeue (inputq);
      
      if (remote_input_mode)
	*cp++ = c;
      else
	{
	  /* Unless this is EOF, add it to the response. */
	  if (!(termstate.c_lflag & ICANON)
	      || !CCEQ (termstate.c_cc[VEOF], c))
	    *cp++ = c;
      
	  /* If this is a break character, then finish now. */
	  if ((termstate.c_lflag & ICANON)
	      && (c == '\n'
		  || CCEQ (termstate.c_cc[VEOF], c)
		  || CCEQ (termstate.c_cc[VEOL], c)
		  || CCEQ (termstate.c_cc[VEOL2], c)))
	    break;
	  
	  /* If this is the delayed suspend character, then signal now. */
	  if ((termstate.c_lflag & ISIG)
	      && CCEQ (termstate.c_cc[VDSUSP], c))
	    {
	      /* The CANCEL flag is being used here to tell the return
		 below to make sure we don't signal EOF on a VDUSP that
		 happens at the front of a line. */
	      send_signal (SIGTSTP);
	      cancel = 1;
	      break;
	    }
	}
    }

  if (remote_input_mode && qsize (inputq) == 1)
    dequeue (inputq);

  *datalen = cp - *data;

  mutex_unlock (&global_lock);

  call_asyncs ();

  return !*datalen && cancel ? EINTR : 0;
}

error_t
trivfs_S_io_readable (struct trivfs_protid *cred,
		      mach_port_t reply,
		      mach_msg_type_name_t replytype,
		      int *amt)
{
  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class == pty_class)
    return pty_io_readable (amt);

  mutex_lock (&global_lock);
  if ((cred->po->openmodes & O_READ) == 0)
    return EBADF;
  *amt = qsize (inputq);
  if (remote_input_mode && *amt)
    --*amt;
  mutex_unlock (&global_lock);

  return 0;
}

/* TIOCMODG ioctl -- Get modem state */
kern_return_t
S_tioctl_tiocmodg (io_t port,
		   int *state)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);
  *state = (*bottom->mdmstate) ();
  mutex_unlock (&global_lock);
  
  ports_port_deref (cred);
  return 0;
}

/* TIOCMODS ioctl -- Set modem state */
kern_return_t
S_tioctl_tiocmods (io_t port,
		   int state)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;
  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);

  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err = EBADF;
  else
    {
      (*bottom->mdmctl) (MDMCTL_SET, state);
      err = 0;
    }
  
  mutex_unlock (&global_lock);

  ports_port_deref (cred);
  return err;
}

/* TIOCEXCL ioctl -- Set exclusive use */
kern_return_t
S_tioctl_tiocexcl (io_t port)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;
  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);

  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err = EBADF;
  else
    {
      termflags |= EXCL_USE;
      err = 0;
    }

  mutex_unlock (&global_lock);
  ports_port_deref (cred);
  return err;
}

/* TIOCNXCL ioctl -- Clear exclusive use */
kern_return_t
S_tioctl_tiocnxcl (io_t port)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;
  
  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);
  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err = EBADF;
  else
    {
      termflags &= ~EXCL_USE;
      err = 0;
    }

  mutex_unlock (&global_lock);
  ports_port_deref (cred);
  return err;
}

/* TIOCFLUSH ioctl -- Flush input, output, or both */
kern_return_t
S_tioctl_tiocflush (io_t port,
		    int flags)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);

  error_t err;
  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);
  
  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err =  EBADF;
  else
    {
      if (flags == 0)
	flags = O_READ|O_WRITE;

      if (flags & O_READ)
	{
	  clear_queue (inputq);
	  (*bottom->notice_input_flushed) ();
	}

      if (flags & O_WRITE)
	drop_output ();

      err = 0;
    }

  mutex_unlock (&global_lock);
  ports_port_deref (cred);
  return err;
}
  
/* TIOCGETA ioctl -- Get termios state */
kern_return_t
S_tioctl_tiocgeta (io_t port,
		   tcflag_t *modes,
		   cc_t *ccs,
		   speed_t *speeds)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);
  modes[0] = termstate.c_iflag;
  modes[1] = termstate.c_oflag;
  modes[2] = termstate.c_cflag;
  modes[3] = termstate.c_lflag;
  bcopy (termstate.c_cc, ccs, NCCS);
  speeds[0] = termstate.__ispeed;
  speeds[1] = termstate.__ospeed;
  mutex_unlock (&global_lock);

  ports_port_deref (cred);
  return 0;
}

/* Common code for the varios TIOCSET* commands. */
static error_t
set_state (io_t port,
	   tcflag_t *modes,
	   cc_t *ccs,
	   speed_t *speeds,
	   int draino,
	   int flushi)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;
  int oldlflag;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);
  
  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err =  EBADF;
  else if (!fg_p (cred))
    err = EBACKGROUND;
  else  
    {
      if (cred->pi.class == pty_class)
	{
	  clear_queue (outputq);
	  (*bottom->abandon_physical_output) ();
	}

      if (draino)
	{
	  err = drain_output ();
	  if (err)
	    {
	      mutex_unlock (&global_lock);
	      ports_port_deref (cred);
	      return err;
	    }
	}
      
      if (flushi)
	{
	  clear_queue (inputq);
	  (*bottom->notice_input_flushed) ();
	}

      oldlflag = termstate.c_lflag;
      termstate.c_iflag = modes[0];
      termstate.c_oflag = modes[1];
      termstate.c_cflag = modes[2];
      termstate.c_lflag = modes[3];
      bcopy (ccs, termstate.c_cc, NCCS);
      termstate.__ispeed = speeds[0];
      termstate.__ospeed = speeds[1];

      if (external_processing)
	termstate.c_lflag |= EXTPROC;
      else
	termstate.c_lflag &= ~EXTPROC;

      if (external_processing || !(termstate.c_cflag & CIGNORE))
	(*bottom->set_bits) ();
      if (oldlflag & ICANON)
	{
	  if (!(termstate.c_lflag & ICANON))
	    copy_rawq ();
	}
      else
	{
	  if (termstate.c_lflag & ICANON)
	    rescan_inputq ();
	}
      err = 0;
    }
  
  mutex_unlock (&global_lock);

  ports_port_deref (cred);
  return err;
}



/* TIOCSETA -- Set termios state */
kern_return_t
S_tioctl_tiocseta (io_t port,
		   tcflag_t *modes,
		   cc_t *ccs,
		   speed_t *speeds)
{
  return set_state (port, modes, ccs, speeds, 0, 0);
}

/* Drain output, then set term state.  */
kern_return_t
S_tioctl_tiocsetaw (io_t port,
		    tcflag_t *modes,
		    cc_t *ccs,
		    speed_t *speeds)
{
  return set_state (port, modes, ccs, speeds, 1, 0);
}

/* Flush input, drain output, then set term state.  */
kern_return_t
S_tioctl_tiocsetaf (io_t port,
		    tcflag_t *modes,
		    cc_t *ccs,
		    speed_t *speeds)

{
  return set_state (port, modes, ccs, speeds, 1, 1);
}

/* TIOCGETD -- Return line discipline */
kern_return_t
S_tioctl_tiocgetd (io_t port,
		   int *disc)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  *disc = 0;

  ports_port_deref (cred);
  return 0;
}

/* TIOCSETD -- Set line discipline */
kern_return_t
S_tioctl_tiocsetd (io_t port,
		   int disc)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);
  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err = EBADF;
  mutex_unlock (&global_lock);
  
  if (disc != 0)
    err = ENXIO;
  else
    err = 0;

  ports_port_deref (cred);
  return 0;
}

/* TIOCDRAIN -- Wait for output to drain */
kern_return_t
S_tioctl_tiocdrain (io_t port)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;
  
  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);
  if (!(cred->po->openmodes & O_WRITE))
    {
      mutex_unlock (&global_lock);
      ports_port_deref (cred);
      return EBADF;
    }
  
  err = drain_output ();
  mutex_unlock (&global_lock);
  ports_port_deref (cred);
  return err;
}

/* TIOCSWINSZ -- Set window size */
kern_return_t
S_tioctl_tiocswinsz (io_t port,
		     struct winsize size)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }


  mutex_lock (&global_lock);
  
  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err = EBADF;
  else
    err = 0;

  ports_port_deref (cred);

  if (!err && (size.ws_row - window_size.ws_row +
	       size.ws_col - window_size.ws_col +
	       size.ws_xpixel - window_size.ws_xpixel +
	       size.ws_ypixel - window_size.ws_ypixel) != 0)
    {
      /* The size is actually changing.  Record the new size and notify the
	 process group.  */
      window_size = size;
      send_signal (SIGWINCH);
    }

  mutex_unlock (&global_lock);
  return err;
}

/* TIOCGWINSZ -- Fetch window size */  
kern_return_t
S_tioctl_tiocgwinsz (io_t port,
		     struct winsize *size)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);
  *size = window_size;
  mutex_unlock (&global_lock);

  ports_port_deref (cred);
  return 0;
}

/* TIOCMGET -- Fetch all modem bits */
kern_return_t
S_tioctl_tiocmget (io_t port,
		   int *bits)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);
  *bits = (*bottom->mdmstate) ();
  mutex_unlock (&global_lock);
  
  ports_port_deref (cred);
  return 0;
}
  
/* TIOCMSET -- Set all modem bits */
kern_return_t
S_tioctl_tiocmset (io_t port,
		   int bits)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);
  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err = EBADF;
  else
    {
      (*bottom->mdmctl) (MDMCTL_SET, bits);
      err = 0;
    }
  
  mutex_unlock (&global_lock);
  ports_port_deref (cred);
  return err;
}
  
/* TIOCMBIC -- Clear some modem bits */
kern_return_t
S_tioctl_tiocmbic (io_t port,
		   int bits)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);
  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err = EBADF;
  else
    {
      (*bottom->mdmctl) (MDMCTL_BIC, bits);
      err = 0;
    }
  mutex_unlock (&global_lock);

  ports_port_deref (cred);
  return err;
}

/* TIOCMBIS -- Set some modem bits */
kern_return_t
S_tioctl_tiocmbis (io_t port,
		   int bits)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);

  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err = EBADF;
  else
    {
      (*bottom->mdmctl) (MDMCTL_BIS, bits);
      err = 0;
    }
  mutex_unlock (&global_lock);
  ports_port_deref (cred);
  return err;
}

/* TIOCSTART -- start output as if VSTART were typed */
kern_return_t
S_tioctl_tiocstart (io_t port)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);

  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err = EBADF;
  else
    {
      termflags &= ~USER_OUTPUT_SUSP;
      (*bottom->start_output) ();
      err = 0;
    }
  mutex_unlock (&global_lock);

  ports_port_deref (cred);
  return err;
}

/* TIOCSTOP -- stop output as if VSTOP were typed */
kern_return_t
S_tioctl_tiocstop (io_t port)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }
  mutex_lock (&global_lock);
  
  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err = EBADF;
  else
    {
      termflags |= USER_OUTPUT_SUSP;
      (*bottom->suspend_physical_output) ();
      err = 0;
    }
  mutex_unlock (&global_lock);
  
  ports_port_deref (cred);
  return err;
}
  
/* TIOCSTI -- Simulate terminal input */
kern_return_t
S_tioctl_tiocsti (io_t port,
		  char c)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);

  /* BSD returns EACCES if this is not our controlling terminal,
     but we have no way to do that.  (And I don't think it actually
     provides any security there, either.) */

  if (!(cred->po->openmodes & O_READ))
    err = EPERM;
  else
    {
      input_character (c);
      err = 0;
    }
  mutex_unlock (&global_lock);
  
  ports_port_deref (cred);
  return err;
}

/* TIOCOUTQ -- return output queue size */
kern_return_t
S_tioctl_tiocoutq (io_t port,
		   int *queue_size)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);

  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err = EBADF;
  else
    {
      *queue_size = qsize (outputq) + (*bottom->pending_output_size) ();
      err = 0;
    }
  mutex_unlock (&global_lock);
  
  ports_port_deref (cred);
  return err;
}

/* TIOCSPGRP -- set pgrp of terminal */
kern_return_t
S_tioctl_tiocspgrp (io_t port,
		    int pgrp)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);
  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err = EBADF;
  else
    {
      termflags &= ~NO_OWNER;
      foreground_id = -pgrp;
      err = 0;
    }
  mutex_unlock (&global_lock);
  
  ports_port_deref (cred);
  return err;
}
  
/* TIOCGPGRP --- fetch pgrp of terminal */
kern_return_t
S_tioctl_tiocgpgrp (io_t port,
		    int *pgrp)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t ret;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);
  if (termflags & NO_OWNER)
    ret = ENOTTY;		/* that's what BSD says... */
  else
    {
      *pgrp = - foreground_id;
      ret = 0;
    }
  mutex_unlock (&global_lock);

  ports_port_deref (cred);
  return ret;
}

/* TIOCCDTR -- clear DTR */
kern_return_t
S_tioctl_tioccdtr (io_t port)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);
  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err = EBADF;
  else
    {
      (*bottom->mdmctl) (MDMCTL_BIC, TIOCM_DTR);
      err = 0;
    }
  mutex_unlock (&global_lock);

  ports_port_deref (cred);
  return err;
}
  
/* TIOCSDTR -- set DTR */
kern_return_t
S_tioctl_tiocsdtr (io_t port)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);
  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err = EBADF;
  else
    {
      (*bottom->mdmctl) (MDMCTL_BIS, TIOCM_DTR);
      err = 0;
    }
  mutex_unlock (&global_lock);

  ports_port_deref (cred);
  return err;
}

/* TIOCCBRK -- Clear break condition */
kern_return_t
S_tioctl_tioccbrk (io_t port)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);
  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err = EBADF;
  else
    {
      (*bottom->clear_break) ();
      err = 0;
    }
  mutex_unlock (&global_lock);

  ports_port_deref (cred);
  return err;
}

/* TIOCSBRK -- Set break condition */
kern_return_t
S_tioctl_tiocsbrk (io_t port)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, port, 0);
  error_t err;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class != pty_class
      && cred->pi.class != tty_class)
    {
      ports_port_deref (cred);
      return EOPNOTSUPP;
    }

  mutex_lock (&global_lock);
  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    err = EBADF;
  else
    {
      (*bottom->set_break) ();
      err = 0;
    }
  mutex_unlock (&global_lock);

  ports_port_deref (cred);
  return err;
}

error_t
trivfs_S_file_set_size (struct trivfs_protid *cred,
			off_t size)
{
  if (!cred)
    return EOPNOTSUPP;
  mutex_lock (&global_lock);
  if ((cred->po->openmodes & O_WRITE) == 0)
    {
      mutex_unlock (&global_lock);
      return EBADF;
    }
  mutex_unlock (&global_lock);
  return 0;
}

error_t
trivfs_S_io_seek (struct trivfs_protid *cred,
		  off_t off,
		  int whence,
		  off_t *newp)
{
  return ESPIPE;
}

error_t
trivfs_S_io_get_openmodes (struct trivfs_protid *cred,
			   mach_port_t reply,
			   mach_msg_type_name_t replytype,
			   int *bits)
{
  if (!cred)
    return EOPNOTSUPP;

  mutex_lock (&global_lock);
  *bits = cred->po->openmodes;
  mutex_unlock (&global_lock);
  return 0;
}

#define HONORED_STATE_MODES (O_APPEND|O_ASYNC|O_FSYNC|O_NONBLOCK|O_NOATIME)

error_t
trivfs_S_io_set_all_openmodes (struct trivfs_protid *cred,
			       mach_port_t reply,
			       mach_msg_type_name_t replytype,
			       int bits)
{

  if (!cred)
    return EOPNOTSUPP;

  mutex_lock (&global_lock);
  cred->po->openmodes &= ~HONORED_STATE_MODES;
  cred->po->openmodes |= (bits & HONORED_STATE_MODES);
  mutex_unlock (&global_lock);
  return 0;
}

error_t
trivfs_S_io_set_some_openmodes (struct trivfs_protid *cred,
			     mach_port_t reply,
			     mach_msg_type_name_t reply_type,
			     int bits)
{
  if (!cred)
    return EOPNOTSUPP;

  mutex_lock (&global_lock);
  cred->po->openmodes |= (bits & HONORED_STATE_MODES);
  mutex_unlock (&global_lock);
  return 0;
}
  
error_t
trivfs_S_io_clear_some_openmodes (struct trivfs_protid *cred,
			       mach_port_t reply,
			       mach_msg_type_name_t reply_type,
			       int bits)
{
  if (!cred)
    return EOPNOTSUPP;

  mutex_lock (&global_lock);
  cred->po->openmodes &= ~(bits & HONORED_STATE_MODES);
  mutex_unlock (&global_lock);
  return 0;
}

error_t
trivfs_S_io_mod_owner (struct trivfs_protid *cred,
		    mach_port_t reply,
		    mach_msg_type_name_t reply_type,
		    pid_t owner)
{
  if (!cred)
    return EOPNOTSUPP;

  mutex_lock (&global_lock);
  termflags &= ~NO_OWNER;
  foreground_id = owner;
  mutex_unlock (&global_lock);
  return 0;
}

error_t
trivfs_S_io_get_owner (struct trivfs_protid *cred,
		    mach_port_t erply,
		    mach_msg_type_name_t reply_type,
		    pid_t *owner)
{
  if (!cred)
    return EOPNOTSUPP;

  mutex_lock (&global_lock);
  if (termflags & NO_OWNER)
    {
      mutex_unlock (&global_lock);
      return ENOTTY;
    }
  *owner = foreground_id;
  mutex_unlock (&global_lock);
  return 0;
}

error_t
trivfs_S_io_get_async_icky (struct trivfs_protid *cred,
			    mach_port_t *id,
			    mach_msg_type_name_t *idtype)
{
  if (!cred)
    return EOPNOTSUPP;

  mutex_lock (&global_lock);
  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    {
      mutex_unlock (&global_lock);
      return EBADF;
    }
  *id = async_icky_id;
  *idtype = MACH_MSG_TYPE_MAKE_SEND;
  mutex_unlock (&global_lock);
  return 0;
}

error_t
trivfs_S_io_async (struct trivfs_protid *cred,
		   mach_port_t notify,
		   mach_port_t *id,
		   mach_msg_type_name_t *idtype)
{
  struct async_req *ar;
  if (!cred)
    return EOPNOTSUPP;

  mutex_lock (&global_lock);
  if (!(cred->po->openmodes & (O_READ|O_WRITE)))
    {
      mutex_unlock (&global_lock);
      return EBADF;
    }
  ar = malloc (sizeof (struct async_req));
  ar->notify = notify;
  ar->next = async_requests;
  async_requests = ar;
  *id = async_id;
  *idtype = MACH_MSG_TYPE_MAKE_SEND;
  mutex_unlock (&global_lock);
  return 0;
}

error_t
trivfs_S_io_select (struct trivfs_protid *cred,
		    mach_port_t reply,
		    mach_msg_type_name_t reply_type,
		    int *type,
		    int *idtag)
{
  int available;

  if (!cred)
    return EOPNOTSUPP;

  if (cred->pi.class == pty_class)
    return pty_io_select (cred, type, idtag);

  /* We don't deal with SELECT_URG here.  */
  if (*type & ~(SELECT_READ | SELECT_WRITE))
    return EINVAL;

  available = 0;
  if (*type == 0)
    return 0;

  mutex_lock (&global_lock);
  
  while (1)
    {
      if ((*type & SELECT_READ) && qsize (inputq))
	available |= SELECT_READ;
      if ((*type & SELECT_WRITE) && qavail (outputq))
	available |= SELECT_WRITE;

      if (available)
	{
	  *type = available;
	  mutex_unlock (&global_lock);
	  return 0;
	}

      if (hurd_condition_wait (&select_alert, &global_lock))
	{
	  *type = 0;
	  mutex_unlock (&global_lock);
	  return EINTR;
	}
    }
}

kern_return_t
trivfs_S_io_map (struct trivfs_protid *cred,
		 mach_port_t *rdobj,
		 mach_msg_type_name_t *rdtype,
		 mach_port_t *wrobj,
		 mach_msg_type_name_t *wrtype)
{
  return EOPNOTSUPP;
}

/* Call all the scheduled async I/O handlers */
static void
call_asyncs ()
{
  struct async_req *ar, *nxt, **prevp;
  mach_port_t err;

  /* If no I/O is possible or nobody wants async
     messages, don't bother further. */
  if ((!(termflags & ICKY_ASYNC) && !async_requests)
      || (!qsize (inputq) && !qavail (outputq)))
    return;
  
  if ((termflags & ICKY_ASYNC) && !(termflags & NO_OWNER))
    hurd_sig_post (foreground_id, SIGIO, async_icky_id);
  
  for (ar = async_requests, prevp = &async_requests;
       ar;
       ar = nxt)
    {
      nxt = ar->next;
      err = nowait_msg_sig_post (ar->notify, SIGIO, async_id);
      if (err == MACH_SEND_INVALID_DEST)
	{
	  /* Receiver died; remove the notification request.  */
	  *prevp = ar->next;
	  mach_port_deallocate (mach_task_self (), ar->notify);
	  free (ar);
	}
      else
	prevp = &ar->next;
    }
}

/* Send a signal to the current process (group) of the terminal. */
void
send_signal (int signo)
{
  mach_port_t right;

  if (!(termflags & NO_OWNER))
    {
      right = ports_get_right (cttyid);
      mach_port_insert_right (mach_task_self (), right, right,
			      MACH_MSG_TYPE_MAKE_SEND);
      hurd_sig_post (foreground_id, signo, right);
      mach_port_deallocate (mach_task_self (), right);
    }
}

void
report_carrier_off ()
{
  termflags |= NO_CARRIER;
  if (!(termstate.c_cflag & CLOCAL))
    send_signal (SIGHUP);
}

void
report_carrier_on ()
{
  termflags &= ~NO_CARRIER;
  condition_broadcast (&carrier_alert);
}

kern_return_t
S_term_get_nodename (io_t arg,
		     char *name)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, arg,
						  tty_class);
  if (!cred)
    return EOPNOTSUPP;
  
  strcpy (name, nodename);

  ports_port_deref (cred);
  return 0;
}

kern_return_t
S_term_set_nodename (io_t arg,
		     char *name)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, arg,
						  tty_class);
  if (!cred)
    return EOPNOTSUPP;
  ports_port_deref (cred);
  
  if (strcmp (name, nodename))
    return EINVAL;
  
  return 0;
}

kern_return_t
S_term_set_filenode (io_t arg,
		     file_t filenode)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, arg, 
						  tty_class);
  if (!cred)
    return EOPNOTSUPP;
  ports_port_deref (cred);

  return EINVAL;
}

kern_return_t
S_term_get_bottom_type (io_t arg,
			int *ttype)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, 
						  arg, tty_class);
  if (!cred)
    return EOPNOTSUPP;

  ports_port_deref (cred);
  if (bottom == &devio_bottom)
    *ttype = TERM_ON_MACHDEV;
  else
    *ttype = TERM_ON_MASTERPTY;
  return 0;
}

kern_return_t
S_term_on_machdev (io_t arg,
		   device_t machdev)
{
  struct trivfs_protid *cred = ports_lookup_port (term_bucket, arg, 
						  tty_class);
  if (!cred)
    return EOPNOTSUPP;
  ports_port_deref (cred);
  return EINVAL;
}

kern_return_t
S_term_on_hurddev (io_t arg,
		   io_t hurddev)
{
  return EOPNOTSUPP;
}

kern_return_t
S_term_on_pty (io_t arg,
	       mach_port_t *master)
{
  return EOPNOTSUPP;
}

error_t
trivfs_goaway (struct trivfs_control *cntl, int flags)
{
  return EBUSY;
}