mango/include/socks/object.h

#ifndef SOCKS_OBJECT_H_
#define SOCKS_OBJECT_H_

#include <socks/locks.h>
#include <socks/status.h>
#include <socks/vm.h>
#include <stddef.h>

#ifdef __cplusplus
extern "C" {
#endif

#define OBJECT_MAGIC 0xBADDCAFE
#define OBJECT_NAME_MAX 64

#define OBJECT_CAST(to_type, to_type_member, p) \
	((to_type *)((uintptr_t)p) - offsetof(to_type, to_type_member))
#define OBJECT_C_CAST(c_type, c_type_member, obj_type, objp) \
	OBJECT_IS_TYPE(objp, obj_type) ? OBJECT_CAST(c_type, c_type_member, (objp)) : NULL
#define OBJECT_IS_TYPE(obj, type_ptr) \
	((obj)->ob_type == (type_ptr))

struct object;
struct object_attrib;

enum object_type_flags {
	OBJTYPE_INIT = 0x01u,
};

struct object_ops {
	kern_status_t(*open)(struct object *obj);
	kern_status_t(*close)(struct object *obj);
	kern_status_t(*destroy)(struct object *obj);
	kern_status_t(*query_name)(struct object *obj, char out[OBJECT_NAME_MAX]);
	kern_status_t(*parse)(struct object *obj, const char *path, struct object **out);
	kern_status_t(*get_named)(struct object *obj, const char *name, struct object **out);
	kern_status_t(*get_at)(struct object *obj, size_t at, struct object **out);
	kern_status_t(*read_attrib)(struct object *obj, struct object_attrib *attrib, char *out, size_t max, size_t *r);
	kern_status_t(*write_attrib)(struct object *obj, struct object_attrib *attrib, const char *s, size_t len, size_t *r);
};

struct object_attrib {
	char *a_name;
	struct queue_entry a_list;
};

struct object_type {
	enum object_type_flags ob_flags;
	char ob_name[32];
	unsigned int ob_size;
	struct vm_cache ob_cache;
	struct queue_entry ob_list;
	struct queue ob_attrib;
	struct object_ops ob_ops;
};

struct object {
	uint32_t ob_magic;
	struct object_type *ob_type;
	spin_lock_t ob_lock;
	unsigned int ob_refcount;
	unsigned int ob_handles;
	struct queue ob_attrib;
	struct queue_entry ob_list;
} __aligned(sizeof(long));

extern kern_status_t object_bootstrap(void);
extern kern_status_t object_type_register(struct object_type *p);
extern kern_status_t object_type_unregister(struct object_type *p);

extern struct object_namespace *global_namespace(void);
extern struct object_namespace *object_namespace_create(void);
extern struct object *ns_header(struct object_namespace *ns);
extern kern_status_t object_namespace_get_object(struct object_namespace *ns, const char *path, struct object **out);
extern kern_status_t object_publish(struct object_namespace *ns, const char *path, struct object *obj);
extern kern_status_t object_unpublish(struct object_namespace *ns, struct object *obj);

extern struct object *object_create(struct object_type *type);
extern struct object *object_ref(struct object *obj);
extern void object_deref(struct object *obj);
extern void object_lock(struct object *obj, unsigned long *flags);
extern void object_unlock(struct object *obj, unsigned long flags);
static inline kern_status_t object_get(const char *path, struct object **out)
{
	return object_namespace_get_object(global_namespace(), path, out);
}
extern kern_status_t object_get_child_named(struct object *obj, const char *name, struct object **out);
extern kern_status_t object_get_child_at(struct object *obj, size_t at, struct object **out);
extern kern_status_t object_query_name(struct object *obj, char name[OBJECT_NAME_MAX]);

extern struct object *set_create(const char *name);
extern kern_status_t set_add_object(struct object *set, struct object *obj);
extern kern_status_t set_remove_object(struct object *set, struct object *obj);
extern bool object_is_set(struct object *obj);

extern void init_set_objects(void);
extern void init_global_namespace(void);

#ifdef __cplusplus
}
#endif

#endif