Kernel-ctl: Expose kernel clear buffer operation
[lttng-tools.git] / src / common / compat / uuid.h
1 /*
2 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a copy
5 * of this software and associated documentation files (the "Software"), to
6 * deal in the Software without restriction, including without limitation the
7 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
8 * sell copies of the Software, and to permit persons to whom the Software is
9 * furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
18 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
19 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
20 * IN THE SOFTWARE.
21 */
22
23 #ifndef LTTNG_UUID_H
24 #define LTTNG_UUID_H
25
26 #include <common/macros.h>
27
28 /*
29 * Includes final \0.
30 */
31 #define UUID_STR_LEN 37
32 #define UUID_LEN 16
33
34 #ifdef LTTNG_HAVE_LIBUUID
35 #include <uuid/uuid.h>
36
37 /*
38 * uuid_out is of len UUID_LEN.
39 */
40 static inline
41 int lttng_uuid_generate(unsigned char *uuid_out)
42 {
43 uuid_generate(uuid_out);
44 return 0;
45 }
46
47 #elif defined(LTTNG_HAVE_LIBC_UUID)
48 #include <uuid.h>
49 #include <stdint.h>
50
51 /*
52 * uuid_out is of len UUID_LEN.
53 */
54 static inline
55 int lttng_uuid_generate(unsigned char *uuid_out)
56 {
57 uint32_t status;
58
59 uuid_create((uuid_t *) uuid_out, &status);
60 if (status == uuid_s_ok)
61 return 0;
62 else
63 return -1;
64 }
65
66 #else
67 #error "LTTng-Tools needs to have a UUID generator configured."
68 #endif
69
70 /*
71 * Convert a UUID to a human-readable, NULL-terminated, string of the form
72 * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.
73 *
74 * Assumes uuid_str is at least UUID_STR_LEN byte long.
75 */
76 LTTNG_HIDDEN
77 void lttng_uuid_to_str(const unsigned char *uuid, char *uuid_str);
78
79 #endif /* LTTNG_UUID_H */
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