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
32 #define CLOCK_UUID_LEN 37
37 * Currently using the kernel MONOTONIC clock, waiting for kernel-side
38 * LTTng to implement mmap'd trace clock.
41 /* Choosing correct trace clock */
44 uint64_t trace_clock_read64(void)
48 clock_gettime(CLOCK_MONOTONIC
, &ts
);
49 return ((uint64_t) ts
.tv_sec
* 1000000000ULL) + ts
.tv_nsec
;
53 uint64_t trace_clock_freq(void)
59 const int trace_clock_uuid(char *uuid
)
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.
70 fp
= fopen("/proc/sys/kernel/random/boot_id", "r");
74 len
= fread(uuid
, 1, CLOCK_UUID_LEN
- 1, fp
);
75 if (len
< CLOCK_UUID_LEN
- 1) {
79 uuid
[CLOCK_UUID_LEN
- 1] = '\0';
85 #endif /* _UST_CLOCK_H */
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