Object
[Cache]

Data Structures

struct  nl_derived_object

Modules

 Object API

Object Creation/Deletion



struct nl_object * nl_object_alloc (struct nl_object_ops *ops)
 Allocate a new object of kind specified by the operations handle.
struct nl_object * nl_object_alloc_name (const char *kind)
 Allocate a new object of kind specified by the name.
struct nl_object * nl_object_clone (struct nl_object *obj)
 Allocate a new object and copy all data from an existing object.
void nl_object_free (struct nl_object *obj)
 Free a cacheable object.

Reference Management



void nl_object_get (struct nl_object *obj)
 Acquire a reference on a object.
void nl_object_put (struct nl_object *obj)
 Release a reference from an object.
int nl_object_shared (struct nl_object *obj)
 Check whether this object is used by multiple users.

Marks



void nl_object_mark (struct nl_object *obj)
 Add mark to object.
void nl_object_unmark (struct nl_object *obj)
 Remove mark from object.
int nl_object_is_marked (struct nl_object *obj)
 Return true if object is marked.

Utillities



void nl_object_dump (struct nl_object *obj, struct nl_dump_params *params)
 Dump this object according to the specified parameters.
int nl_object_identical (struct nl_object *a, struct nl_object *b)
 Check if the identifiers of two objects are identical.
uint32_t nl_object_diff (struct nl_object *a, struct nl_object *b)
 Compute bitmask representing difference in attribute values.
int nl_object_match_filter (struct nl_object *obj, struct nl_object *filter)
 Match a filter against an object.
char * nl_object_attrs2str (struct nl_object *obj, uint32_t attrs, char *buf, size_t len)
 Convert bitmask of attributes to a character string.
char * nl_object_attr_list (struct nl_object *obj, char *buf, size_t len)
 Return list of attributes present in an object.

Attributes



int nl_object_get_refcnt (struct nl_object *obj)
struct nl_cache * nl_object_get_cache (struct nl_object *obj)
void * nl_object_priv (struct nl_object *obj)

Function Documentation

struct nl_object* nl_object_alloc ( struct nl_object_ops ops  )  [read]
Parameters:
ops cache operations handle
Returns:
The new object or NULL

Definition at line 42 of file object.c.

References nl_object_ops::oo_constructor, and nl_object_ops::oo_size.

Referenced by nl_object_alloc_name(), and nl_object_clone().

00043 {
00044         struct nl_object *new;
00045 
00046         if (ops->oo_size < sizeof(*new))
00047                 BUG();
00048 
00049         new = calloc(1, ops->oo_size);
00050         if (!new) {
00051                 nl_errno(ENOMEM);
00052                 return NULL;
00053         }
00054 
00055         new->ce_refcnt = 1;
00056         nl_init_list_head(&new->ce_list);
00057 
00058         new->ce_ops = ops;
00059         if (ops->oo_constructor)
00060                 ops->oo_constructor(new);
00061 
00062         NL_DBG(4, "Allocated new object %p\n", new);
00063 
00064         return new;
00065 }

struct nl_object* nl_object_alloc_name ( const char *  kind  )  [read]
Parameters:
kind name of object type
Returns:
The new object or nULL

Definition at line 72 of file object.c.

References nl_cache_ops_lookup(), and nl_object_alloc().

00073 {
00074         struct nl_cache_ops *ops;
00075 
00076         ops = nl_cache_ops_lookup(kind);
00077         if (!ops) {
00078                 nl_error(ENOENT, "Unable to lookup cache kind \"%s\"", kind);
00079                 return NULL;
00080         }
00081 
00082         return nl_object_alloc(ops->co_obj_ops);
00083 }

struct nl_object* nl_object_clone ( struct nl_object *  obj  )  [read]
Parameters:
obj object to inherite data from
Returns:
The new object or NULL.

Definition at line 95 of file object.c.

References nl_object_alloc(), nl_object_free(), nl_object_ops::oo_clone, nl_object_ops::oo_free_data, and nl_object_ops::oo_size.

Referenced by nl_cache_add().

00096 {
00097         struct nl_object *new;
00098         struct nl_object_ops *ops = obj_ops(obj);
00099         int doff = offsetof(struct nl_derived_object, data);
00100         int size;
00101 
00102         new = nl_object_alloc(ops);
00103         if (!new)
00104                 return NULL;
00105 
00106         size = ops->oo_size - doff;
00107         if (size < 0)
00108                 BUG();
00109 
00110         new->ce_ops = obj->ce_ops;
00111         new->ce_msgtype = obj->ce_msgtype;
00112 
00113         if (size)
00114                 memcpy((void *)new + doff, (void *)obj + doff, size);
00115 
00116         if (ops->oo_clone) {
00117                 if (ops->oo_clone(new, obj) < 0) {
00118                         nl_object_free(new);
00119                         return NULL;
00120                 }
00121         } else if (size && ops->oo_free_data)
00122                 BUG();
00123 
00124         return new;
00125 }

void nl_object_free ( struct nl_object *  obj  ) 
Parameters:
obj object to free
Returns:
0 or a negative error code.

Definition at line 133 of file object.c.

References nl_cache_remove(), and nl_object_ops::oo_free_data.

Referenced by nl_object_clone(), and nl_object_put().

00134 {
00135         struct nl_object_ops *ops = obj_ops(obj);
00136 
00137         if (obj->ce_refcnt > 0)
00138                 NL_DBG(1, "Warning: Freeing object in use...\n");
00139 
00140         if (obj->ce_cache)
00141                 nl_cache_remove(obj);
00142 
00143         if (ops->oo_free_data)
00144                 ops->oo_free_data(obj);
00145 
00146         free(obj);
00147 
00148         NL_DBG(4, "Freed object %p\n", obj);
00149 }

void nl_object_get ( struct nl_object *  obj  ) 
Parameters:
obj object to acquire reference from

Definition at line 162 of file object.c.

Referenced by genl_ctrl_search(), genl_ctrl_search_by_name(), nl_cache_add(), nl_cache_move(), nl_cache_search(), rtnl_link_get(), rtnl_link_get_by_name(), rtnl_neigh_get(), rtnl_neightbl_get(), rtnl_qdisc_get(), and rtnl_qdisc_get_by_parent().

00163 {
00164         obj->ce_refcnt++;
00165         NL_DBG(4, "New reference to object %p, total %d\n",
00166                obj, obj->ce_refcnt);
00167 }

void nl_object_put ( struct nl_object *  obj  ) 
Parameters:
obj object to release reference from

Definition at line 173 of file object.c.

References nl_object_free().

Referenced by nl_cache_remove().

00174 {
00175         if (!obj)
00176                 return;
00177 
00178         obj->ce_refcnt--;
00179         NL_DBG(4, "Returned object reference %p, %d remaining\n",
00180                obj, obj->ce_refcnt);
00181 
00182         if (obj->ce_refcnt < 0)
00183                 BUG();
00184 
00185         if (obj->ce_refcnt <= 0)
00186                 nl_object_free(obj);
00187 }

int nl_object_shared ( struct nl_object *  obj  ) 
Parameters:
obj object to check
Returns:
true or false

Definition at line 194 of file object.c.

00195 {
00196         return obj->ce_refcnt > 1;
00197 }

void nl_object_mark ( struct nl_object *  obj  ) 
Parameters:
obj Object to mark

Definition at line 210 of file object.c.

Referenced by nl_cache_mark_all().

00211 {
00212         obj->ce_flags |= NL_OBJ_MARK;
00213 }

void nl_object_unmark ( struct nl_object *  obj  ) 
Parameters:
obj Object to unmark

Definition at line 219 of file object.c.

00220 {
00221         obj->ce_flags &= ~NL_OBJ_MARK;
00222 }

int nl_object_is_marked ( struct nl_object *  obj  ) 
Parameters:
obj Object to check
Returns:
true if object is marked, otherwise false

Definition at line 229 of file object.c.

00230 {
00231         return (obj->ce_flags & NL_OBJ_MARK);
00232 }

void nl_object_dump ( struct nl_object *  obj,
struct nl_dump_params params 
)
Parameters:
obj object to dump
params dumping parameters

Definition at line 246 of file object.c.

00247 {
00248         dump_from_ops(obj, params);
00249 }

int nl_object_identical ( struct nl_object *  a,
struct nl_object *  b 
)
Parameters:
a an object
b another object of same type
Returns:
true if both objects have equal identifiers, otherwise false.

Definition at line 258 of file object.c.

References nl_object_ops::oo_compare.

Referenced by nl_cache_search().

00259 {
00260         struct nl_object_ops *ops = obj_ops(a);
00261         int req_attrs;
00262 
00263         /* Both objects must be of same type */
00264         if (ops != obj_ops(b))
00265                 return 0;
00266 
00267         req_attrs = ops->oo_id_attrs;
00268 
00269         /* Both objects must provide all required attributes to uniquely
00270          * identify an object */
00271         if ((a->ce_mask & req_attrs) != req_attrs ||
00272             (b->ce_mask & req_attrs) != req_attrs)
00273                 return 0;
00274 
00275         /* Can't judge unless we can compare */
00276         if (ops->oo_compare == NULL)
00277                 return 0;
00278 
00279         return !(ops->oo_compare(a, b, req_attrs, 0));
00280 }

uint32_t nl_object_diff ( struct nl_object *  a,
struct nl_object *  b 
)
Parameters:
a an object
b another object of same type

The bitmask returned is specific to an object type, each bit set represents an attribute which mismatches in either of the two objects. Unavailability of an attribute in one object and presence in the other is regarded a mismatch as well.

Returns:
Bitmask describing differences or 0 if they are completely identical.

Definition at line 294 of file object.c.

References nl_object_ops::oo_compare.

00295 {
00296         struct nl_object_ops *ops = obj_ops(a);
00297 
00298         if (ops != obj_ops(b) || ops->oo_compare == NULL)
00299                 return UINT_MAX;
00300 
00301         return ops->oo_compare(a, b, ~0, 0);
00302 }

int nl_object_match_filter ( struct nl_object *  obj,
struct nl_object *  filter 
)
Parameters:
obj object to check
filter object of same type acting as filter
Returns:
1 if the object matches the filter or 0 if no filter procedure is available or if the filter does not match.

Definition at line 313 of file object.c.

References nl_object_ops::oo_compare.

Referenced by nl_cache_dump_filter(), nl_cache_foreach_filter(), nl_cache_nitems_filter(), and nl_cache_subset().

00314 {
00315         struct nl_object_ops *ops = obj_ops(obj);
00316 
00317         if (ops != obj_ops(filter) || ops->oo_compare == NULL)
00318                 return 0;
00319         
00320         return !(ops->oo_compare(obj, filter, filter->ce_mask,
00321                                  LOOSE_FLAG_COMPARISON));
00322 }

char* nl_object_attrs2str ( struct nl_object *  obj,
uint32_t  attrs,
char *  buf,
size_t  len 
)
Parameters:
obj object of same type as attribute bitmask
attrs bitmask of attribute types
buf destination buffer
len length of destination buffer

Converts the bitmask of attribute types into a list of attribute names separated by comas.

Returns:
destination buffer.

Definition at line 336 of file object.c.

Referenced by nl_object_attr_list().

00338 {
00339         struct nl_object_ops *ops = obj_ops(obj);
00340 
00341         if (ops->oo_attrs2str != NULL)
00342                 return ops->oo_attrs2str(attrs, buf, len);
00343         else {
00344                 memset(buf, 0, len);
00345                 return buf;
00346         }
00347 }

char* nl_object_attr_list ( struct nl_object *  obj,
char *  buf,
size_t  len 
)
Parameters:
obj an object
buf destination buffer
len length of destination buffer
Returns:
destination buffer.

Definition at line 357 of file object.c.

References nl_object_attrs2str().

00358 {
00359         return nl_object_attrs2str(obj, obj->ce_mask, buf, len);
00360 }


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