arch/all-pc/boot/grub2-aros/grub-core/fs/proc.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2013  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <grub/procfs.h>
  20 #include <grub/disk.h>
  21 #include <grub/fs.h>
  22 #include <grub/file.h>
  23 #include <grub/mm.h>
  24 #include <grub/dl.h>
  25
  26 GRUB_MOD_LICENSE ("GPLv3+");
  27
  28 struct grub_procfs_entry *grub_procfs_entries;
  29
  30 static int
  31 grub_procdev_iterate (grub_disk_dev_iterate_hook_t hook, void *hook_data,
  32                          grub_disk_pull_t pull)
  33 {
  34   if (pull != GRUB_DISK_PULL_NONE)
  35     return 0;
  36
  37   return hook ("proc", hook_data);
  38 }
  39
  40 static grub_err_t
  41 grub_procdev_open (const char *name, grub_disk_t disk)
  42 {
  43   if (grub_strcmp (name, "proc"))
  44       return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "not a procfs disk");
  45
  46   disk->total_sectors = 0;
  47   disk->id = 0;
  48
  49   disk->data = 0;
  50
  51   return GRUB_ERR_NONE;
  52 }
  53
  54 static void
  55 grub_procdev_close (grub_disk_t disk __attribute((unused)))
  56 {
  57 }
  58
  59 static grub_err_t
  60 grub_procdev_read (grub_disk_t disk __attribute((unused)),
  61                 grub_disk_addr_t sector __attribute((unused)),
  62                 grub_size_t size __attribute((unused)),
  63                 char *buf __attribute((unused)))
  64 {
  65   return GRUB_ERR_OUT_OF_RANGE;
  66 }
  67
  68 static grub_err_t
  69 grub_procdev_write (grub_disk_t disk __attribute ((unused)),
  70                        grub_disk_addr_t sector __attribute ((unused)),
  71                        grub_size_t size __attribute ((unused)),
  72                        const char *buf __attribute ((unused)))
  73 {
  74   return GRUB_ERR_OUT_OF_RANGE;
  75 }
  76
  77 static grub_ssize_t
  78 grub_procfs_read (grub_file_t file, char *buf, grub_size_t len)
  79 {
  80   char *data = file->data;
  81
  82   grub_memcpy (buf, data + file->offset, len);
  83
  84   return len;
  85 }
  86
  87 static grub_err_t
  88 grub_procfs_close (grub_file_t file)
  89 {
  90   char *data;
  91
  92   data = file->data;
  93   grub_free (data);
  94
  95   return GRUB_ERR_NONE;
  96 }
  97
  98 static grub_err_t
  99 grub_procfs_dir (grub_device_t device, const char *path,
 100                  grub_fs_dir_hook_t hook, void *hook_data)
 101 {
 102   const char *ptr;
 103   struct grub_dirhook_info info;
 104   struct grub_procfs_entry *entry;
 105
 106   grub_memset (&info, 0, sizeof (info));
 107
 108   /* Check if the disk is our dummy disk.  */
 109   if (grub_strcmp (device->disk->name, "proc"))
 110     return grub_error (GRUB_ERR_BAD_FS, "not a procfs");
 111   for (ptr = path; *ptr == '/'; ptr++);
 112   if (*ptr)
 113     return 0;
 114   FOR_LIST_ELEMENTS((entry), (grub_procfs_entries))
 115     if (hook (entry->name, &info, hook_data))
 116       return 0;
 117   return 0;
 118 }
 119
 120 static grub_err_t
 121 grub_procfs_open (struct grub_file *file, const char *path)
 122 {
 123   const char *pathptr;
 124   struct grub_procfs_entry *entry;
 125
 126   for (pathptr = path; *pathptr == '/'; pathptr++);
 127
 128   FOR_LIST_ELEMENTS((entry), (grub_procfs_entries))
 129     if (grub_strcmp (pathptr, entry->name) == 0)
 130     {
 131       grub_size_t sz;
 132       file->data = entry->get_contents (&sz);
 133       if (!file->data)
 134         return grub_errno;
 135       file->size = sz;
 136       return GRUB_ERR_NONE;
 137     }
 138
 139   return grub_error (GRUB_ERR_FILE_NOT_FOUND, N_("file `%s' not found"), path);
 140 }
 141
 142 static struct grub_disk_dev grub_procfs_dev = {
 143   .name = "proc",
 144   .id = GRUB_DISK_DEVICE_PROCFS_ID,
 145   .iterate = grub_procdev_iterate,
 146   .open = grub_procdev_open,
 147   .close = grub_procdev_close,
 148   .read = grub_procdev_read,
 149   .write = grub_procdev_write,
 150   .next = 0
 151 };
 152
 153 static struct grub_fs grub_procfs_fs =
 154   {
 155     .name = "procfs",
 156     .dir = grub_procfs_dir,
 157     .open = grub_procfs_open,
 158     .read = grub_procfs_read,
 159     .close = grub_procfs_close,
 160     .next = 0
 161   };
 162
 163 GRUB_MOD_INIT (procfs)
 164 {
 165   grub_disk_dev_register (&grub_procfs_dev);
 166   grub_fs_register (&grub_procfs_fs);
 167 }
 168
 169 GRUB_MOD_FINI (procfs)
 170 {
 171   grub_disk_dev_unregister (&grub_procfs_dev);
 172   grub_fs_unregister (&grub_procfs_fs);
 173 }