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8d8a24c8 MD |
1 | /* |
2 | * Copyright (C) 2010 Pierre-Marc Fournier | |
3 | * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
518d7abb PMF |
4 | * |
5 | * This library is free software; you can redistribute it and/or | |
6 | * modify it under the terms of the GNU Lesser General Public | |
8d8a24c8 MD |
7 | * License as published by the Free Software Foundation; version 2.1 of |
8 | * the License. | |
518d7abb PMF |
9 | * |
10 | * This library is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * Lesser General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU Lesser General Public | |
16 | * License along with this library; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | */ | |
19 | ||
9c6bb081 JD |
20 | #ifndef _UST_CLOCK_H |
21 | #define _UST_CLOCK_H | |
518d7abb | 22 | |
ca4525b5 | 23 | #include <time.h> |
518d7abb | 24 | #include <sys/time.h> |
9edd34bd MD |
25 | #include <stdint.h> |
26 | #include <stddef.h> | |
939950af | 27 | #include <stdio.h> |
578ce73a MD |
28 | |
29 | /* | |
30 | * Includes final \0. | |
31 | */ | |
32 | #define CLOCK_UUID_LEN 37 | |
518d7abb PMF |
33 | |
34 | /* TRACE CLOCK */ | |
35 | ||
8d8a24c8 MD |
36 | /* |
37 | * Currently using the kernel MONOTONIC clock, waiting for kernel-side | |
38 | * LTTng to implement mmap'd trace clock. | |
39 | */ | |
518d7abb | 40 | |
9c6bb081 | 41 | /* Choosing correct trace clock */ |
518d7abb | 42 | |
28b12049 MD |
43 | static __inline__ |
44 | uint64_t trace_clock_read64(void) | |
9c6bb081 JD |
45 | { |
46 | struct timespec ts; | |
9c6bb081 | 47 | |
8d8a24c8 | 48 | clock_gettime(CLOCK_MONOTONIC, &ts); |
dc190cc1 | 49 | return ((uint64_t) ts.tv_sec * 1000000000ULL) + ts.tv_nsec; |
9c6bb081 JD |
50 | } |
51 | ||
28b12049 MD |
52 | static __inline__ |
53 | uint64_t trace_clock_freq(void) | |
518d7abb | 54 | { |
28b12049 MD |
55 | return 1000000000ULL; |
56 | } | |
57 | ||
58 | static __inline__ | |
95c5cc3c | 59 | const int trace_clock_uuid(char *uuid) |
28b12049 | 60 | { |
939950af MD |
61 | int ret = 0; |
62 | size_t len; | |
63 | FILE *fp; | |
64 | ||
65 | /* | |
66 | * boot_id needs to be read once before being used concurrently | |
67 | * to deal with a Linux kernel race. A fix is proposed for | |
68 | * upstream, but the work-around is needed for older kernels. | |
69 | */ | |
70 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
71 | if (!fp) { | |
72 | return -ENOENT; | |
73 | } | |
578ce73a MD |
74 | len = fread(uuid, 1, CLOCK_UUID_LEN - 1, fp); |
75 | if (len < CLOCK_UUID_LEN - 1) { | |
939950af MD |
76 | ret = -EINVAL; |
77 | goto end; | |
78 | } | |
578ce73a | 79 | uuid[CLOCK_UUID_LEN - 1] = '\0'; |
939950af MD |
80 | end: |
81 | fclose(fp); | |
82 | return ret; | |
518d7abb PMF |
83 | } |
84 | ||
9c6bb081 | 85 | #endif /* _UST_CLOCK_H */ |