Basic infrastructure

* procfs.h: New file; basic interfaces for procfs nodes.
* procfs.c: New file; implement the basic infrastructure.
* netfs.c: New file; bridge libnetfs and the procfs interfaces.
* main.c: New file; mostly a "Hello, World!" for now.
* Makefile: New file; standalone for now.

1 files changed, 40 insertions, 0 deletions

diff --git a/procfs.h b/procfs.h
new file mode 100644
index 00000000..0557b6d1
--- /dev/null
+++ b/procfs.h
@@ -0,0 +1,40 @@
+#include <hurd/hurd_types.h>
+#include <hurd/netfs.h>
+
+
+/* Interface for the procfs side. */
+
+/* Any of these callback functions can be omitted, in which case
+   reasonable defaults will be used.  The initial file mode and type
+   depend on whether a lookup function is provided, but can be
+   overridden in update_stat().  */
+struct procfs_node_ops
+{
+  /* Fetch the contents of a node.  A pointer to the contents should be
+     returned in *CONTENTS and their length in *CONTENTS_LEN.  The exact
+     nature of these data depends on whether the node is a regular file,
+     symlink or directory, as determined by the file mode in
+     netnode->nn_stat.  For regular files and symlinks, they are what
+     you would expect; for directories, they are an argz vector of the
+     names of the entries.  */
+  error_t (*get_contents) (void *hook, void **contents, size_t *contents_len);
+  void (*cleanup_contents) (void *contents);
+
+  /* Lookup NAME in this directory, and store the result in *np.  The
+     returned node should be created by lookup() using procfs_make_node() 
+     or a derived function.  */
+  error_t (*lookup) (void *hook, const char *name, struct node **np);
+
+  /* Destroy this node.  */
+  void (*cleanup) (void *hook);
+};
+
+struct node *procfs_make_node (const struct procfs_node_ops *ops, void *hook);
+
+
+/* Interface for the libnetfs side. */
+
+error_t procfs_get_contents (struct node *np, void **data, size_t *data_len);
+error_t procfs_lookup (struct node *np, const char *name, struct node **npp);
+void procfs_cleanup (struct node *np);
+