/* The type ps_tty_t, for per-tty info.

   Copyright (C) 1995 Free Software Foundation, Inc.

   Written by Miles Bader <miles@gnu.ai.mit.edu>

   This program 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.

   This program 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., 675 Mass Ave, Cambridge, MA 02139, USA. */

#include <hurd.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>

#include "ps.h"
#include "common.h"

/* ---------------------------------------------------------------- */

/* Create a ps_tty_t for the tty referred to by PORT, returning it in TTY.
   If a memory allocation error occurs, ENOMEM is returned, otherwise 0.  */
error_t
ps_tty_create(file_t port, ps_tty_t *tty)
{
  *tty = NEW(struct ps_tty);
  if (*tty == NULL)
    return ENOMEM;

  (*tty)->port = port;
  (*tty)->name_state = PS_TTY_NAME_PENDING;

  return 0;
}

/* Frees TTY and any resources it consumes.  */
void
ps_tty_free(ps_tty_t tty)
{
  mach_port_deallocate(mach_task_self(), tty->port);
  if (tty->name_state == PS_TTY_NAME_OK && tty->name != NULL)
    free(tty->name);
  free(tty);
}

/* ---------------------------------------------------------------- */

/* Returns the name of the tty, or NULL if it can't be figured out.  */
char *ps_tty_name(ps_tty_t tty)
{
  if (tty->name_state == PS_TTY_NAME_PENDING)
    {
      string_t buf;

      if (term_get_nodename(tty->port, &buf) != 0)
	/* There is a terminal there, but we can't figure out its name.  */
	tty->name_state = PS_TTY_NAME_ERROR;
      else
	{
	  tty->name = NEWVEC(char, strlen(buf) + 1);
	  if (tty->name == NULL)
	    tty->name_state = PS_TTY_NAME_ERROR;
	  else
	    {
	      strcpy(tty->name, buf);
	      tty->name_state = PS_TTY_NAME_OK;
	    }
	}
    }

  if (tty->name_state == PS_TTY_NAME_OK)
    return tty->name;
  else
    return NULL;
}