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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2013 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/procfs.h>
#include <grub/disk.h>
#include <grub/fs.h>
#include <grub/file.h>
#include <grub/mm.h>
#include <grub/dl.h>
#include <grub/archelp.h>
GRUB_MOD_LICENSE ("GPLv3+");
struct grub_procfs_entry *grub_procfs_entries;
static int
grub_procdev_iterate (grub_disk_dev_iterate_hook_t hook, void *hook_data,
grub_disk_pull_t pull)
{
if (pull != GRUB_DISK_PULL_NONE)
return 0;
return hook ("proc", hook_data);
}
static grub_err_t
grub_procdev_open (const char *name, grub_disk_t disk)
{
if (grub_strcmp (name, "proc"))
return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "not a procfs disk");
disk->total_sectors = 0;
disk->id = 0;
disk->data = 0;
return GRUB_ERR_NONE;
}
static void
grub_procdev_close (grub_disk_t disk __attribute((unused)))
{
}
static grub_err_t
grub_procdev_read (grub_disk_t disk __attribute((unused)),
grub_disk_addr_t sector __attribute((unused)),
grub_size_t size __attribute((unused)),
char *buf __attribute((unused)))
{
return GRUB_ERR_OUT_OF_RANGE;
}
static grub_err_t
grub_procdev_write (grub_disk_t disk __attribute ((unused)),
grub_disk_addr_t sector __attribute ((unused)),
grub_size_t size __attribute ((unused)),
const char *buf __attribute ((unused)))
{
return GRUB_ERR_OUT_OF_RANGE;
}
struct grub_archelp_data
{
struct grub_procfs_entry *entry, *next_entry;
};
static void
grub_procfs_rewind (struct grub_archelp_data *data)
{
data->entry = NULL;
data->next_entry = grub_procfs_entries;
}
static grub_err_t
grub_procfs_find_file (struct grub_archelp_data *data, char **name,
grub_int32_t *mtime,
grub_uint32_t *mode)
{
data->entry = data->next_entry;
if (!data->entry)
{
*mode = GRUB_ARCHELP_ATTR_END;
return GRUB_ERR_NONE;
}
data->next_entry = data->entry->next;
*mode = GRUB_ARCHELP_ATTR_FILE | GRUB_ARCHELP_ATTR_NOTIME;
*name = grub_strdup (data->entry->name);
*mtime = 0;
if (!*name)
return grub_errno;
return GRUB_ERR_NONE;
}
static struct grub_archelp_ops arcops =
{
.find_file = grub_procfs_find_file,
.rewind = grub_procfs_rewind
};
static grub_ssize_t
grub_procfs_read (grub_file_t file, char *buf, grub_size_t len)
{
char *data = file->data;
grub_memcpy (buf, data + file->offset, len);
return len;
}
static grub_err_t
grub_procfs_close (grub_file_t file)
{
char *data;
data = file->data;
grub_free (data);
return GRUB_ERR_NONE;
}
static grub_err_t
grub_procfs_dir (grub_device_t device, const char *path,
grub_fs_dir_hook_t hook, void *hook_data)
{
struct grub_archelp_data data;
/* Check if the disk is our dummy disk. */
if (grub_strcmp (device->disk->name, "proc"))
return grub_error (GRUB_ERR_BAD_FS, "not a procfs");
grub_procfs_rewind (&data);
return grub_archelp_dir (&data, &arcops,
path, hook, hook_data);
}
static grub_err_t
grub_procfs_open (struct grub_file *file, const char *path)
{
grub_err_t err;
struct grub_archelp_data data;
grub_size_t sz;
grub_procfs_rewind (&data);
err = grub_archelp_open (&data, &arcops, path);
if (err)
return err;
file->data = data.entry->get_contents (&sz);
if (!file->data)
return grub_errno;
file->size = sz;
return GRUB_ERR_NONE;
}
static struct grub_disk_dev grub_procfs_dev = {
.name = "proc",
.id = GRUB_DISK_DEVICE_PROCFS_ID,
.disk_iterate = grub_procdev_iterate,
.disk_open = grub_procdev_open,
.disk_close = grub_procdev_close,
.disk_read = grub_procdev_read,
.disk_write = grub_procdev_write,
.next = 0
};
static struct grub_fs grub_procfs_fs =
{
.name = "procfs",
.fs_dir = grub_procfs_dir,
.fs_open = grub_procfs_open,
.fs_read = grub_procfs_read,
.fs_close = grub_procfs_close,
.next = 0
};
GRUB_MOD_INIT (procfs)
{
grub_disk_dev_register (&grub_procfs_dev);
grub_fs_register (&grub_procfs_fs);
}
GRUB_MOD_FINI (procfs)
{
grub_disk_dev_unregister (&grub_procfs_dev);
grub_fs_unregister (&grub_procfs_fs);
}
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