handlers.c revision ed6b39cc7746fabdd0d01c96afcf60b9544913d3 
1/*
2 * Copyright (C) 2011 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *	http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17/* NOTICE: This is a clean room re-implementation of libnl */
18
19#include <malloc.h>
20#include "netlink-types.h"
21#include "netlink/handlers.h"
22
23/* Allocate a new callback handle. */
24struct nl_cb *nl_cb_alloc(enum nl_cb_kind kind)
25{
26	struct nl_cb *cb;
27
28	cb = (struct nl_cb *) malloc(sizeof(struct nl_cb));
29	if (cb == NULL)
30		goto fail;
31	memset(cb, 0, sizeof(*cb));
32
33	return nl_cb_get(cb);
34fail:
35	return NULL;
36}
37
38/* Clone an existing callback handle */
39struct nl_cb *nl_cb_clone(struct nl_cb *orig)
40{
41	struct nl_cb *new_cb;
42	int new_refcnt;
43
44	new_cb = nl_cb_alloc(NL_CB_DEFAULT);
45	if (new_cb == NULL)
46		goto fail;
47
48	/* Preserve reference count and copy original */
49	new_refcnt = new_cb->cb_refcnt;
50	memcpy(new_cb, orig, sizeof(*orig));
51	new_cb->cb_refcnt = new_refcnt;
52
53	return new_cb;
54fail:
55	return NULL;
56}
57
58/* Set up a callback. */
59int nl_cb_set(struct nl_cb *cb, enum nl_cb_type type, enum nl_cb_kind kind, \
60	nl_recvmsg_msg_cb_t func, void *arg)
61{
62	cb->cb_set[type] = func;
63	cb->cb_args[type] = arg;
64	return 0;
65}
66
67
68
69/* Set up an error callback. */
70int nl_cb_err(struct nl_cb *cb, enum nl_cb_kind kind, \
71	nl_recvmsg_err_cb_t func, void *arg)
72{
73	cb->cb_err = func;
74	cb->cb_err_arg = arg;
75	return 0;
76
77}
78
79struct nl_cb *nl_cb_get(struct nl_cb *cb)
80{
81	cb->cb_refcnt++;
82	return cb;
83}
84
85void nl_cb_put(struct nl_cb *cb)
86{
87	cb->cb_refcnt--;
88	if (cb->cb_refcnt <= 0)
89		free(cb);
90
91}
92
93