2 * SPDX-License-Identifier: LGPL-2.1-only
4 * Copyright (C) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 #ifndef LTTNG_UST_CLOCK_H
8 #define LTTNG_UST_CLOCK_H
14 * Set each callback for the trace clock override, and then enable the
15 * override. Those functions return negative error values on error, 0 on
19 typedef uint64_t (*lttng_ust_clock_read64_function
)(void);
20 typedef uint64_t (*lttng_ust_clock_freq_function
)(void);
21 typedef int (*lttng_ust_clock_uuid_function
)(char *uuid
);
22 typedef const char *(*lttng_ust_clock_name_function
)(void);
23 typedef const char *(*lttng_ust_clock_description_function
)(void);
26 * Set/Get clock override read callback. This callback should return the
27 * current clock time (a 64-bit monotonic counter).
29 int lttng_ust_trace_clock_set_read64_cb(lttng_ust_clock_read64_function read64_cb
);
30 int lttng_ust_trace_clock_get_read64_cb(lttng_ust_clock_read64_function
*read64_cb
);
33 * Set/Get clock override frequency callback. This callback should return
34 * the frequency of the clock in cycles per second.
36 int lttng_ust_trace_clock_set_freq_cb(lttng_ust_clock_freq_function freq_cb
);
37 int lttng_ust_trace_clock_get_freq_cb(lttng_ust_clock_freq_function
*freq_cb
);
40 * Set/Get clock override unique identifier.
41 * LTTNG_UST_UUID_STR_LEN is the maximum length of uuid string. Includes
44 #define LTTNG_UST_UUID_STR_LEN 37
46 int lttng_ust_trace_clock_set_uuid_cb(lttng_ust_clock_uuid_function uuid_cb
);
47 int lttng_ust_trace_clock_get_uuid_cb(lttng_ust_clock_uuid_function
*uuid_cb
);
50 * Set/Get clock override name.
52 int lttng_ust_trace_clock_set_name_cb(lttng_ust_clock_name_function name_cb
);
53 int lttng_ust_trace_clock_get_name_cb(lttng_ust_clock_name_function
*name_cb
);
56 * Set/Get clock override description.
58 int lttng_ust_trace_clock_set_description_cb(lttng_ust_clock_description_function description_cb
);
59 int lttng_ust_trace_clock_get_description_cb(lttng_ust_clock_description_function
*description_cb
);
62 * Use the clock override rather than the default clock.
64 int lttng_ust_enable_trace_clock_override(void);
66 #endif /* LTTNG_UST_CLOCK_H */