sys/link.h


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#include "sys/lockstack.h"
#ifndef _JOVE_SYS_LINK_HPP
#define _JOVE_SYS_LINK_HPP 1

#include "hal/obj.h"

#ifdef __x86_64__
#include "arch/x86_64/sys/link.h"
#endif

typedef struct obj_perm_group
{
    jove_owned_obj_t *obj;
    uint8_t permissions;
} jove_perm_obj_t;

uint8_t link_getperm(jove_link_obj_t *link);
void link_setperm(jove_link_obj_t *link, uint8_t perm);

void link_lock(jove_link_obj_t *link);
void link_unlock(jove_link_obj_t *link);

jove_owned_obj_t *link_deref(jove_link_obj_t *link);
jove_owned_obj_t *link_try_deref(jove_link_obj_t *link);

jove_perm_obj_t link_traverse(jove_owned_obj_t *link, lockstack_t *lockstack);
jove_perm_obj_t link_try_traverse(jove_owned_obj_t *link, lockstack_t *lockstack);

/**Try to retrieve an object from the object directory, resolving each link as it's encountered.
 * Permissions are preserved through traversal, meaning objects are limited by their
 * objdir permissions.*/
jove_perm_obj_t link_try_traverse_objdir(jove_owned_obj_t *objdir, 
        lockstack_t *lockstack, size_t pathlen, objpath_part_t *path);

jove_obj_t link_unlink(jove_owned_obj_t *link);
int link_new(jove_owned_obj_t *target_obj, jove_owned_obj_t *untyped_obj, uint8_t permissions);
int link_dup(jove_owned_obj_t *link_obj, jove_owned_obj_t *dest_obj);

#endif