grub/kern/device.c
2002-12-27 08:53:07 +00:00

99 lines
2.1 KiB
C

/* device.c - device manager */
/*
* PUPA -- Preliminary Universal Programming Architecture for GRUB
* Copyright (C) 2002 Yoshinori K. Okuji <okuji@enbug.org>
*
* PUPA 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 of the License, 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 PUPA; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <pupa/device.h>
#include <pupa/disk.h>
#include <pupa/net.h>
#include <pupa/fs.h>
#include <pupa/mm.h>
#include <pupa/misc.h>
static char *pupa_device_root;
pupa_err_t
pupa_device_set_root (const char *name)
{
pupa_free (pupa_device_root);
pupa_device_root = pupa_strdup (name);
return pupa_errno;
}
const char *
pupa_device_get_root (void)
{
if (! pupa_device_root)
pupa_error (PUPA_ERR_BAD_DEVICE, "no root device");
return pupa_device_root;
}
pupa_device_t
pupa_device_open (const char *name)
{
pupa_disk_t disk = 0;
pupa_device_t dev = 0;
if (! name)
{
if (! pupa_device_root)
{
pupa_error (PUPA_ERR_BAD_DEVICE, "no device is set");
goto fail;
}
name = pupa_device_root;
}
dev = pupa_malloc (sizeof (*dev));
if (! dev)
goto fail;
/* Try to open a disk. */
disk = pupa_disk_open (name);
if (! disk)
{
pupa_error (PUPA_ERR_BAD_DEVICE, "unknown device");
goto fail;
}
dev->disk = disk;
dev->net = 0; /* FIXME */
return dev;
fail:
if (disk)
pupa_disk_close (disk);
pupa_free (dev);
return 0;
}
pupa_err_t
pupa_device_close (pupa_device_t device)
{
if (device->disk)
pupa_disk_close (device->disk);
pupa_free (device);
return pupa_errno;
}