Branch data Line data Source code
1 : : /*
2 : : * Copyright (c) 2016, Citrix Systems, Inc.
3 : : *
4 : : * All rights reserved.
5 : : *
6 : : * Redistribution and use in source and binary forms, with or without
7 : : * modification, are permitted provided that the following conditions are met:
8 : : *
9 : : * 1. Redistributions of source code must retain the above copyright
10 : : * notice, this list of conditions and the following disclaimer.
11 : : * 2. Redistributions in binary form must reproduce the above copyright
12 : : * notice, this list of conditions and the following disclaimer in the
13 : : * documentation and/or other materials provided with the distribution.
14 : : * 3. Neither the name of the copyright holder nor the names of its
15 : : * contributors may be used to endorse or promote products derived from
16 : : * this software without specific prior written permission.
17 : : *
18 : : * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 : : * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 : : * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 : : * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
22 : : * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
23 : : * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
24 : : * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
25 : : * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26 : : * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27 : : * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28 : : * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 : : */
30 : :
31 : : #include <stdio.h>
32 : : #include <stdlib.h>
33 : : #include <string.h>
34 : :
35 : : #include "debug.h"
36 : : #include "tap-ctl.h"
37 : :
38 : 0 : int tap_ctl_info(pid_t pid, unsigned long long *sectors,
39 : : unsigned int *sector_size, unsigned int *info, const int minor)
40 : : {
41 : : tapdisk_message_t message;
42 : : int err;
43 : :
44 : 0 : ASSERT(sectors);
45 : 0 : ASSERT(sector_size);
46 : 0 : ASSERT(info);
47 : :
48 : : memset(&message, 0, sizeof(message));
49 : 0 : message.type = TAPDISK_MESSAGE_DISK_INFO;
50 : 0 : message.cookie = minor;
51 : :
52 : 0 : err = tap_ctl_connect_send_and_receive(pid, &message, NULL);
53 : 0 : if (err) {
54 : 0 : EPRINTF("failed to get info from tapdisk %d: %s\n", pid,
55 : : strerror(-err));
56 : 0 : return err;
57 : : }
58 : :
59 : 0 : if (TAPDISK_MESSAGE_DISK_INFO_RSP == message.type) {
60 : 0 : *sectors = message.u.image.sectors;
61 : 0 : *sector_size = message.u.image.sector_size;
62 : 0 : *info = message.u.image.info;
63 : 0 : return 0;
64 : 0 : } else if (TAPDISK_MESSAGE_ERROR == message.type) {
65 : 0 : return -message.u.response.error;
66 : : } else {
67 : 0 : EPRINTF("unexpected reply %d\n", message.type);
68 : : return -EINVAL;
69 : : }
70 : : }
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