2 * Copyright (C) 2010 Pierre-Marc Fournier
3 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; version 2.1 of
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.
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
28 #include "lttng-ust-uuid.h"
33 * Currently using the kernel MONOTONIC clock, waiting for kernel-side
34 * LTTng to implement mmap'd trace clock.
37 /* Choosing correct trace clock */
40 uint64_t trace_clock_read64(void)
44 if (caa_unlikely(clock_gettime(CLOCK_MONOTONIC
, &ts
))) {
48 return ((uint64_t) ts
.tv_sec
* 1000000000ULL) + ts
.tv_nsec
;
52 uint64_t trace_clock_freq(void)
58 int trace_clock_uuid(char *uuid
)
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.
69 fp
= fopen("/proc/sys/kernel/random/boot_id", "r");
73 len
= fread(uuid
, 1, LTTNG_UST_UUID_STR_LEN
- 1, fp
);
74 if (len
< LTTNG_UST_UUID_STR_LEN
- 1) {
78 uuid
[LTTNG_UST_UUID_STR_LEN
- 1] = '\0';
84 #endif /* _UST_CLOCK_H */
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