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#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 *hook, void *contents, size_t contents_len);
/* 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);
};
/* These helper functions can be used as procfs_node_ops.cleanup_contents. */
void procfs_cleanup_contents_with_free (void *, void *, size_t);
void procfs_cleanup_contents_with_vm_deallocate (void *, void *, size_t);
/* Create a new node and return it. Returns NULL if it fails to allocate
enough memory. In this case, ops->cleanup will be invoked. */
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);
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