172 lines
4.1 KiB
C
172 lines
4.1 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2013 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/procfs.h>
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#include <grub/disk.h>
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#include <grub/fs.h>
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#include <grub/file.h>
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#include <grub/mm.h>
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#include <grub/dl.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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struct grub_procfs_entry *grub_procfs_entries;
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static int
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grub_procdev_iterate (grub_disk_dev_iterate_hook_t hook, void *hook_data,
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grub_disk_pull_t pull)
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{
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if (pull != GRUB_DISK_PULL_NONE)
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return 0;
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return hook ("proc", hook_data);
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}
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static grub_err_t
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grub_procdev_open (const char *name, grub_disk_t disk)
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{
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if (grub_strcmp (name, "proc"))
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return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "not a procfs disk");
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disk->total_sectors = 0;
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disk->id = (unsigned long) "proc";
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disk->data = 0;
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return GRUB_ERR_NONE;
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}
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static void
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grub_procdev_close (grub_disk_t disk __attribute((unused)))
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{
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}
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static grub_err_t
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grub_procdev_read (grub_disk_t disk __attribute((unused)),
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grub_disk_addr_t sector __attribute((unused)),
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grub_size_t size __attribute((unused)),
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char *buf __attribute((unused)))
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{
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return GRUB_ERR_OUT_OF_RANGE;
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}
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static grub_err_t
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grub_procdev_write (grub_disk_t disk __attribute ((unused)),
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grub_disk_addr_t sector __attribute ((unused)),
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grub_size_t size __attribute ((unused)),
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const char *buf __attribute ((unused)))
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{
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return GRUB_ERR_OUT_OF_RANGE;
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}
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static grub_ssize_t
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grub_procfs_read (grub_file_t file, char *buf, grub_size_t len)
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{
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char *data = file->data;
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grub_memcpy (buf, data + file->offset, len);
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return len;
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}
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static grub_err_t
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grub_procfs_close (grub_file_t file)
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{
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char *data;
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data = file->data;
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grub_free (data);
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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grub_procfs_dir (grub_device_t device, const char *path,
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grub_fs_dir_hook_t hook, void *hook_data)
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{
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const char *ptr;
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struct grub_dirhook_info info;
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struct grub_procfs_entry *entry;
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grub_memset (&info, 0, sizeof (info));
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/* Check if the disk is our dummy disk. */
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if (grub_strcmp (device->disk->name, "proc"))
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return grub_error (GRUB_ERR_BAD_FS, "not a procfs");
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for (ptr = path; *ptr == '/'; ptr++);
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if (*ptr)
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return 0;
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FOR_LIST_ELEMENTS((entry), (grub_procfs_entries))
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if (hook (entry->name, &info, hook_data))
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return 0;
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return 0;
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}
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static grub_err_t
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grub_procfs_open (struct grub_file *file, const char *path)
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{
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const char *pathptr;
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struct grub_procfs_entry *entry;
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for (pathptr = path; *pathptr == '/'; pathptr++);
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FOR_LIST_ELEMENTS((entry), (grub_procfs_entries))
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if (grub_strcmp (pathptr, entry->name) == 0)
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{
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file->data = entry->get_contents ();
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if (!file->data)
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return grub_errno;
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file->size = grub_strlen (file->data);
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return GRUB_ERR_NONE;
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}
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return grub_error (GRUB_ERR_FILE_NOT_FOUND, N_("file `%s' not found"), path);
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}
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static struct grub_disk_dev grub_procfs_dev = {
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.name = "proc",
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.id = GRUB_DISK_DEVICE_PROCFS_ID,
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.iterate = grub_procdev_iterate,
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.open = grub_procdev_open,
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.close = grub_procdev_close,
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.read = grub_procdev_read,
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.write = grub_procdev_write,
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.next = 0
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};
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static struct grub_fs grub_procfs_fs =
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{
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.name = "procfs",
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.dir = grub_procfs_dir,
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.open = grub_procfs_open,
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.read = grub_procfs_read,
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.close = grub_procfs_close,
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.next = 0
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};
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GRUB_MOD_INIT (procfs)
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{
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grub_disk_dev_register (&grub_procfs_dev);
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grub_fs_register (&grub_procfs_fs);
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}
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GRUB_MOD_FINI (procfs)
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{
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grub_disk_dev_unregister (&grub_procfs_dev);
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grub_fs_unregister (&grub_procfs_fs);
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}
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