automake commit without merge history

grub-core/disk/host.c

@@ -0,0 +1,96 @@
+/* host.c - Dummy disk driver to provide access to the hosts filesystem  */
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2007  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/>.
+ */
+
+/* When using the disk, make a reference to this module.  Otherwise
+   the user will end up with a useless module :-).  */
+
+#include <grub/dl.h>
+#include <grub/disk.h>
+#include <grub/misc.h>
+
+int grub_disk_host_i_want_a_reference;
+
+static int
+grub_host_iterate (int (*hook) (const char *name))
+{
+  if (hook ("host"))
+    return 1;
+  return 0;
+}
+
+static grub_err_t
+grub_host_open (const char *name, grub_disk_t disk)
+{
+  if (grub_strcmp (name, "host"))
+      return grub_error (GRUB_ERR_UNKNOWN_DEVICE, "not a host disk");
+
+  disk->total_sectors = 0;
+  disk->id = (unsigned long) "host";
+
+  disk->has_partitions = 0;
+  disk->data = 0;
+
+  return GRUB_ERR_NONE;
+}
+
+static void
+grub_host_close (grub_disk_t disk __attribute((unused)))
+{
+}
+
+static grub_err_t
+grub_host_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_host_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;
+}
+
+static struct grub_disk_dev grub_host_dev =
+  {
+    /* The only important line in this file :-) */
+    .name = "host",
+    .id = GRUB_DISK_DEVICE_HOST_ID,
+    .iterate = grub_host_iterate,
+    .open = grub_host_open,
+    .close = grub_host_close,
+    .read = grub_host_read,
+    .write = grub_host_write,
+    .next = 0
+  };
+
+GRUB_MOD_INIT(host)
+{
+  grub_disk_dev_register (&grub_host_dev);
+}
+
+GRUB_MOD_FINI(host)
+{
+  grub_disk_dev_unregister (&grub_host_dev);
+}