Implement simple directories

* procfs_dir.h: New file; declare the procfs_dir_make_node
  function, based on the procfs_dir_entry structure.
* procfs_dir.c: New file; implement simple directories.
* Makefile: Add the procfs_dir module.
* main.c: Use it.

1 files changed, 15 insertions, 0 deletions

diff --git a/procfs_dir.h b/procfs_dir.h
new file mode 100644
index 00000000..1ba45ad0
--- /dev/null
+++ b/procfs_dir.h
@@ -0,0 +1,15 @@
+
+/* Each entry associates a name with a callback function for creating new
+   nodes corresponding to that entry.  */
+struct procfs_dir_entry
+{
+  const char *name;
+  struct node *(*make_node)(void *dir_hook, void *entry_hook);
+  void *hook;
+};
+
+/* A simple directory is built from a table of entries.  The table is
+   terminated by a null NAME pointer.  */
+struct node *
+procfs_dir_make_node (const struct procfs_dir_entry *entries, void *dir_hook);
+