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 : : #ifdef HAVE_CONFIG_H
32 : : #include "config.h"
33 : : #endif
34 : :
35 : : #include <stdio.h>
36 : : #include <errno.h>
37 : : #include <unistd.h>
38 : : #include <string.h>
39 : :
40 : : #include "tap-ctl.h"
41 : : #include "blktap2.h"
42 : :
43 : : int
44 : 0 : tap_ctl_check_blktap(const char **msg)
45 : : {
46 : : FILE *f;
47 : 0 : int err = 0, minor;
48 : : char name[33];
49 : :
50 : : memset(name, 0, sizeof(name));
51 : :
52 : 0 : f = fopen("/proc/misc", "r");
53 : 0 : if (!f) {
54 : 0 : *msg = "failed to open /proc/misc";
55 : 0 : return -errno;
56 : : }
57 : :
58 : 0 : while (fscanf(f, "%d %32s", &minor, name) == 2) {
59 : 0 : if (!strcmp(name, BLKTAP2_CONTROL_NAME))
60 : : goto out;
61 : : }
62 : :
63 : 0 : err = -ENOSYS;
64 : 0 : *msg = "blktap kernel module not installed";
65 : :
66 : : out:
67 : 0 : fclose(f);
68 : : return err;
69 : : }
70 : :
71 : : int
72 : 0 : tap_ctl_check(const char **msg)
73 : : {
74 : : int err;
75 : :
76 : 0 : err = tap_ctl_check_blktap(msg);
77 : 0 : if (err)
78 : : goto out;
79 : :
80 : 0 : err = 0;
81 : 0 : *msg = "ok";
82 : :
83 : : out:
84 : 0 : return err;
85 : : }
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