Move files to procfs to merge along hurd

1 files changed, 63 insertions, 0 deletions

diff --git a/procfs/procfs_dir.h b/procfs/procfs_dir.h
new file mode 100644
index 00000000..94c5b019
--- /dev/null
+++ b/procfs/procfs_dir.h
@@ -0,0 +1,63 @@
+/* Hurd /proc filesystem, infrastructure for directories.
+   Copyright (C) 2010 Free Software Foundation, Inc.
+
+   This file is part of the GNU Hurd.
+
+   The GNU Hurd 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.
+
+   The GNU Hurd 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. */
+
+/* This module provides an abstraction layer for implementing simple
+   directories with (mostly) static contents.  The user defines the
+   contents of the directory by providing a table of entries and various
+   optional callback functions.  */
+
+/* These operations define how a given entry will behave.  Either can be
+   omitted, both from the entry-specific operations and from the
+   directory-wide defaults.  */
+struct procfs_dir_entry_ops
+{
+  /* Called when this entry is looked up to create a corresponding node.  */
+  struct node *(*make_node)(void *dir_hook, const void *entry_hook);
+  /* If this is provided and returns 0, this entry will be hidden.  */
+  int (*exists)(void *dir_hook, const void *entry_hook);
+};
+
+/* Describes an individual directory entry, associating a NAME with
+ * arbitrary HOOK data and node-specific OPS.  */
+struct procfs_dir_entry
+{
+  const char *name;
+  const void *hook;
+  struct procfs_dir_entry_ops ops;
+};
+
+/* Describes a complete directory. ENTRIES is a table terminated by a
+   null NAME field. ENTRY_OPS provides default operations for the
+   entries which don't specify them.  The optional CLEANUP function
+   should release all the resources associated with the directory hook.  */
+struct procfs_dir_ops
+{
+  const struct procfs_dir_entry *entries;
+  void (*cleanup)(void *dir_hook);
+  struct procfs_dir_entry_ops entry_ops;
+};
+
+/* Create and return a new node for the directory described in OPS.
+   The DIR_HOOK is passed the MAKE_NODE callback function of looked up
+   entries, as well as to the CLEANUP callback when the node is
+   destroyed.  If not enough memory can be allocated, OPS->CLEANUP is
+   invoked immediately and NULL is returned.  */
+struct node *
+procfs_dir_make_node (const struct procfs_dir_ops *ops, void *dir_hook);
+