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1 office 1 /*
2 * lib/object.c Generic Cacheable Object
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation version 2.1
7 * of the License.
8 *
9 * Copyright (c) 2003-2008 Thomas Graf <tgraf@suug.ch>
10 */
11  
12 /**
13 * @ingroup cache
14 * @defgroup object Object
15 * @{
16 */
17  
18 #include <netlink-local.h>
19 #include <netlink/netlink.h>
20 #include <netlink/cache.h>
21 #include <netlink/object.h>
22 #include <netlink/utils.h>
23  
24 static inline struct nl_object_ops *obj_ops(struct nl_object *obj)
25 {
26 if (!obj->ce_ops)
27 BUG();
28  
29 return obj->ce_ops;
30 }
31  
32 /**
33 * @name Object Creation/Deletion
34 * @{
35 */
36  
37 /**
38 * Allocate a new object of kind specified by the operations handle
39 * @arg ops cache operations handle
40 * @return The new object or NULL
41 */
42 struct nl_object *nl_object_alloc(struct nl_object_ops *ops)
43 {
44 struct nl_object *new;
45  
46 if (ops->oo_size < sizeof(*new))
47 BUG();
48  
49 new = calloc(1, ops->oo_size);
50 if (!new)
51 return NULL;
52  
53 new->ce_refcnt = 1;
54 nl_init_list_head(&new->ce_list);
55  
56 new->ce_ops = ops;
57 if (ops->oo_constructor)
58 ops->oo_constructor(new);
59  
60 NL_DBG(4, "Allocated new object %p\n", new);
61  
62 return new;
63 }
64  
65 struct nl_derived_object {
66 NLHDR_COMMON
67 char data;
68 };
69  
70 /**
71 * Allocate a new object and copy all data from an existing object
72 * @arg obj object to inherite data from
73 * @return The new object or NULL.
74 */
75 struct nl_object *nl_object_clone(struct nl_object *obj)
76 {
77 struct nl_object *new;
78 struct nl_object_ops *ops = obj_ops(obj);
79 int doff = offsetof(struct nl_derived_object, data);
80 int size;
81  
82 new = nl_object_alloc(ops);
83 if (!new)
84 return NULL;
85  
86 size = ops->oo_size - doff;
87 if (size < 0)
88 BUG();
89  
90 new->ce_ops = obj->ce_ops;
91 new->ce_msgtype = obj->ce_msgtype;
92  
93 if (size)
94 memcpy((void *)new + doff, (void *)obj + doff, size);
95  
96 if (ops->oo_clone) {
97 if (ops->oo_clone(new, obj) < 0) {
98 nl_object_free(new);
99 return NULL;
100 }
101 } else if (size && ops->oo_free_data)
102 BUG();
103  
104 return new;
105 }
106  
107 /**
108 * Free a cacheable object
109 * @arg obj object to free
110 *
111 * @return 0 or a negative error code.
112 */
113 void nl_object_free(struct nl_object *obj)
114 {
115 struct nl_object_ops *ops = obj_ops(obj);
116  
117 if (obj->ce_refcnt > 0)
118 NL_DBG(1, "Warning: Freeing object in use...\n");
119  
120 if (obj->ce_cache)
121 nl_cache_remove(obj);
122  
123 if (ops->oo_free_data)
124 ops->oo_free_data(obj);
125  
126 free(obj);
127  
128 NL_DBG(4, "Freed object %p\n", obj);
129 }
130  
131 /** @} */
132  
133 /**
134 * @name Reference Management
135 * @{
136 */
137  
138 /** @} */
139  
140 /**
141 * @name Utillities
142 * @{
143 */
144  
145 /** @} */
146  
147 /** @} */