1 files changed, 91 insertions, 0 deletions
diff --git a/ufs-utils/dlabel.c b/ufs-utils/dlabel.c
new file mode 100644
index 00000000..1bb30bbc
--- /dev/null
+++ b/ufs-utils/dlabel.c
@@ -0,0 +1,91 @@
+/* Get the disklabel from a device node
+
+   Copyright (C) 1996, 1999 Free Software Foundation, Inc.
+
+   Written by Miles Bader <miles@gnu.org>
+
+   This program 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, 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 this program; if not, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#include <errno.h>
+#include <hurd.h>
+#include <mach.h>
+#include <string.h>
+#include <device/device.h>
+#include <device/disk_status.h>
+#include <hurd/store.h>
+
+/* XXX Ick. */
+#define IOCPARM_MASK 0x1fff/* parameter length, at most 13 bits */
+#define IOC_OUT 0x40000000/* copy out parameters */
+#define _IOC(inout,group,num,len) \
+	(inout | ((len & IOCPARM_MASK) << 16) | ((group) << 8) | (num))
+#define _IOR(g,n,t) _IOC(IOC_OUT,(g), (n), sizeof(t))
+
+static error_t
+fd_get_device (int fd, device_t *device)
+{
+  error_t err;
+  struct store *store;
+  file_t node = getdport (fd);
+
+  if (node == MACH_PORT_NULL)
+    return errno;
+
+  err = store_create (node, 0, 0, &store);
+  if (! err)
+    {
+      if (store->class->id != STORAGE_DEVICE
+	  /* In addition to requiring a device, we also want the *whole*
+	     device -- one contiguous run starting at 0.  */
+	  || store->num_runs != 1
+	  || store->runs[0].start != 0)
+	err = ENODEV;
+      else if (store->port == MACH_PORT_NULL)
+	/* Usually getting a null port back means we didn't have sufficient
+	   privileges.  */
+	err = EPERM;
+      else
+	{
+	  *device = store->port;
+	  store->port = MACH_PORT_NULL;	/* Steal the port from STORE!  */
+	}
+      store_free (store);
+    }
+
+  mach_port_deallocate (mach_task_self (), node);
+
+  return err;
+}
+
+error_t
+fd_get_disklabel (int fd, struct disklabel *label)
+{
+  device_t device;
+  error_t err = fd_get_device (fd, &device);
+
+  if (! err)
+    {
+      mach_msg_type_number_t label_len = sizeof *label / sizeof (integer_t);
+
+      err = device_get_status (device, DIOCGDINFO,
+			       (dev_status_t)label, &label_len);
+      if (!err && label_len != sizeof *label / sizeof (integer_t))
+	err = ERANGE;
+
+      mach_port_deallocate (mach_task_self (), device);
+    }
+
+  return err;
+}