Root/Documentation/connector/cn_test.c

1/*
2 * cn_test.c
3 *
4 * 2004+ Copyright (c) Evgeniy Polyakov <zbr@ioremap.net>
5 * All rights reserved.
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22#define pr_fmt(fmt) "cn_test: " fmt
23
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/moduleparam.h>
27#include <linux/skbuff.h>
28#include <linux/slab.h>
29#include <linux/timer.h>
30
31#include <linux/connector.h>
32
33static struct cb_id cn_test_id = { CN_NETLINK_USERS + 3, 0x456 };
34static char cn_test_name[] = "cn_test";
35static struct sock *nls;
36static struct timer_list cn_test_timer;
37
38static void cn_test_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
39{
40    pr_info("%s: %lu: idx=%x, val=%x, seq=%u, ack=%u, len=%d: %s.\n",
41            __func__, jiffies, msg->id.idx, msg->id.val,
42            msg->seq, msg->ack, msg->len,
43            msg->len ? (char *)msg->data : "");
44}
45
46/*
47 * Do not remove this function even if no one is using it as
48 * this is an example of how to get notifications about new
49 * connector user registration
50 */
51#if 0
52static int cn_test_want_notify(void)
53{
54    struct cn_ctl_msg *ctl;
55    struct cn_notify_req *req;
56    struct cn_msg *msg = NULL;
57    int size, size0;
58    struct sk_buff *skb;
59    struct nlmsghdr *nlh;
60    u32 group = 1;
61
62    size0 = sizeof(*msg) + sizeof(*ctl) + 3 * sizeof(*req);
63
64    size = NLMSG_SPACE(size0);
65
66    skb = alloc_skb(size, GFP_ATOMIC);
67    if (!skb) {
68        pr_err("failed to allocate new skb with size=%u\n", size);
69        return -ENOMEM;
70    }
71
72    nlh = NLMSG_PUT(skb, 0, 0x123, NLMSG_DONE, size - sizeof(*nlh));
73
74    msg = (struct cn_msg *)NLMSG_DATA(nlh);
75
76    memset(msg, 0, size0);
77
78    msg->id.idx = -1;
79    msg->id.val = -1;
80    msg->seq = 0x123;
81    msg->ack = 0x345;
82    msg->len = size0 - sizeof(*msg);
83
84    ctl = (struct cn_ctl_msg *)(msg + 1);
85
86    ctl->idx_notify_num = 1;
87    ctl->val_notify_num = 2;
88    ctl->group = group;
89    ctl->len = msg->len - sizeof(*ctl);
90
91    req = (struct cn_notify_req *)(ctl + 1);
92
93    /*
94     * Idx.
95     */
96    req->first = cn_test_id.idx;
97    req->range = 10;
98
99    /*
100     * Val 0.
101     */
102    req++;
103    req->first = cn_test_id.val;
104    req->range = 10;
105
106    /*
107     * Val 1.
108     */
109    req++;
110    req->first = cn_test_id.val + 20;
111    req->range = 10;
112
113    NETLINK_CB(skb).dst_group = ctl->group;
114    //netlink_broadcast(nls, skb, 0, ctl->group, GFP_ATOMIC);
115    netlink_unicast(nls, skb, 0, 0);
116
117    pr_info("request was sent: group=0x%x\n", ctl->group);
118
119    return 0;
120
121nlmsg_failure:
122    pr_err("failed to send %u.%u\n", msg->seq, msg->ack);
123    kfree_skb(skb);
124    return -EINVAL;
125}
126#endif
127
128static u32 cn_test_timer_counter;
129static void cn_test_timer_func(unsigned long __data)
130{
131    struct cn_msg *m;
132    char data[32];
133
134    pr_debug("%s: timer fired with data %lu\n", __func__, __data);
135
136    m = kzalloc(sizeof(*m) + sizeof(data), GFP_ATOMIC);
137    if (m) {
138
139        memcpy(&m->id, &cn_test_id, sizeof(m->id));
140        m->seq = cn_test_timer_counter;
141        m->len = sizeof(data);
142
143        m->len =
144            scnprintf(data, sizeof(data), "counter = %u",
145                  cn_test_timer_counter) + 1;
146
147        memcpy(m + 1, data, m->len);
148
149        cn_netlink_send(m, 0, GFP_ATOMIC);
150        kfree(m);
151    }
152
153    cn_test_timer_counter++;
154
155    mod_timer(&cn_test_timer, jiffies + msecs_to_jiffies(1000));
156}
157
158static int cn_test_init(void)
159{
160    int err;
161
162    err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback);
163    if (err)
164        goto err_out;
165    cn_test_id.val++;
166    err = cn_add_callback(&cn_test_id, cn_test_name, cn_test_callback);
167    if (err) {
168        cn_del_callback(&cn_test_id);
169        goto err_out;
170    }
171
172    setup_timer(&cn_test_timer, cn_test_timer_func, 0);
173    mod_timer(&cn_test_timer, jiffies + msecs_to_jiffies(1000));
174
175    pr_info("initialized with id={%u.%u}\n",
176        cn_test_id.idx, cn_test_id.val);
177
178    return 0;
179
180      err_out:
181    if (nls && nls->sk_socket)
182        sock_release(nls->sk_socket);
183
184    return err;
185}
186
187static void cn_test_fini(void)
188{
189    del_timer_sync(&cn_test_timer);
190    cn_del_callback(&cn_test_id);
191    cn_test_id.val--;
192    cn_del_callback(&cn_test_id);
193    if (nls && nls->sk_socket)
194        sock_release(nls->sk_socket);
195}
196
197module_init(cn_test_init);
198module_exit(cn_test_fini);
199
200MODULE_LICENSE("GPL");
201MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
202MODULE_DESCRIPTION("Connector's test module");
203

Archive Download this file



interactive