Commit | Line | Data |
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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> |
eda498b8 | 28 | #include "lttng-ust-uuid.h" |
518d7abb PMF |
29 | |
30 | /* TRACE CLOCK */ | |
31 | ||
8d8a24c8 MD |
32 | /* |
33 | * Currently using the kernel MONOTONIC clock, waiting for kernel-side | |
34 | * LTTng to implement mmap'd trace clock. | |
35 | */ | |
518d7abb | 36 | |
9c6bb081 | 37 | /* Choosing correct trace clock */ |
518d7abb | 38 | |
28b12049 MD |
39 | static __inline__ |
40 | uint64_t trace_clock_read64(void) | |
9c6bb081 JD |
41 | { |
42 | struct timespec ts; | |
9c6bb081 | 43 | |
6a57ced1 MD |
44 | if (caa_unlikely(clock_gettime(CLOCK_MONOTONIC, &ts))) { |
45 | ts.tv_sec = 0; | |
46 | ts.tv_nsec = 0; | |
47 | } | |
dc190cc1 | 48 | return ((uint64_t) ts.tv_sec * 1000000000ULL) + ts.tv_nsec; |
9c6bb081 JD |
49 | } |
50 | ||
28b12049 MD |
51 | static __inline__ |
52 | uint64_t trace_clock_freq(void) | |
518d7abb | 53 | { |
28b12049 MD |
54 | return 1000000000ULL; |
55 | } | |
56 | ||
57 | static __inline__ | |
bf24b009 | 58 | int trace_clock_uuid(char *uuid) |
28b12049 | 59 | { |
939950af MD |
60 | int ret = 0; |
61 | size_t len; | |
62 | FILE *fp; | |
63 | ||
64 | /* | |
65 | * boot_id needs to be read once before being used concurrently | |
66 | * to deal with a Linux kernel race. A fix is proposed for | |
67 | * upstream, but the work-around is needed for older kernels. | |
68 | */ | |
69 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); | |
70 | if (!fp) { | |
71 | return -ENOENT; | |
72 | } | |
19d8b1b3 MD |
73 | len = fread(uuid, 1, LTTNG_UST_UUID_STR_LEN - 1, fp); |
74 | if (len < LTTNG_UST_UUID_STR_LEN - 1) { | |
939950af MD |
75 | ret = -EINVAL; |
76 | goto end; | |
77 | } | |
19d8b1b3 | 78 | uuid[LTTNG_UST_UUID_STR_LEN - 1] = '\0'; |
939950af MD |
79 | end: |
80 | fclose(fp); | |
81 | return ret; | |
518d7abb PMF |
82 | } |
83 | ||
9c6bb081 | 84 | #endif /* _UST_CLOCK_H */ |