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/* Per-open information for devio.
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 "open.h"
#include "window.h"
#include "dev.h"
/* ---------------------------------------------------------------- */
/* Returns a new per-open structure for the device DEV in OPEN. If an error
occurs, the error-code is returned, otherwise 0. */
error_t
open_create(struct dev *dev, struct open **open)
{
error_t err;
*open = malloc(sizeof(struct open));
if (*open == NULL)
return ENOMEM;
(*open)->dev = dev;
err = io_state_init(&(*open)->io_state, dev);
if (!err && dev_is(dev, DEV_BUFFERED) && !dev_is(dev, DEV_SERIAL))
/* A random-access buffered device -- use a pager to do i/o to it. */
{
mach_port_t memobj;
err = dev_get_memory_object(dev, &memobj);
if (!err)
err =
window_create(memobj, dev->size, 0, 0, dev_is(dev, DEV_READONLY),
&(*open)->window); /* XXX sizes */
if (err)
{
mach_port_destroy(mach_task_self(), memobj);
io_state_finalize(&(*open)->io_state);
}
}
else
(*open)->window = NULL;
if (err)
free(*open);
return err;
}
/* ---------------------------------------------------------------- */
/* Free OPEN and any resources it holds. */
void
open_free(struct open *open)
{
io_state_finalize(&open->io_state);
window_free(open->window);
free(open);
}
/* ---------------------------------------------------------------- */
/* Returns the appropiate io_state object for OPEN (which may be either
per-open or a per-device depending on the device). */
struct io_state *
open_get_io_state(struct open *open)
{
return
dev_is(open->dev, DEV_SERIAL) ? &open->dev->io_state : &open->io_state;
}
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