2 * lttng-clock-override-example.c
4 * Copyright (c) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
29 #include <lttng/ust-clock.h>
32 uint64_t plugin_read64(void)
36 clock_gettime(CLOCK_MONOTONIC
, &ts
);
38 * This is a rather dumb example, but it illustrates the plugin
39 * mechanism: we take the monotonic clock, and transform it into
40 * a very coarse clock, which increment only at 1KHz frequency.
42 return ((uint64_t) ts
.tv_sec
* 1000ULL) + (ts
.tv_nsec
/ 1000000ULL);
46 uint64_t plugin_freq(void)
48 return 1000; /* 1KHz clock (very coarse!) */
52 int plugin_uuid(char *uuid
)
54 const char myuuid
[] = "123456789012345678901234567890123456";
57 * Should read some unique identifier for this clock shared
58 * across all components of the system using this clock for
61 memcpy(uuid
, myuuid
, LTTNG_UST_UUID_STR_LEN
);
66 const char *plugin_name(void)
68 return "my_example_clock";
72 const char *plugin_description(void)
74 return "Coarse monotonic clock at 1KHz";
77 void lttng_ust_clock_plugin_init(void)
81 ret
= lttng_ust_trace_clock_set_read64_cb(plugin_read64
);
83 fprintf(stderr
, "Error setting clock override read64 callback: %s\n",
87 ret
= lttng_ust_trace_clock_set_freq_cb(plugin_freq
);
89 fprintf(stderr
, "Error setting clock override freq callback: %s\n",
93 ret
= lttng_ust_trace_clock_set_uuid_cb(plugin_uuid
);
95 fprintf(stderr
, "Error setting clock override uuid callback: %s\n",
100 ret
= lttng_ust_trace_clock_set_name_cb(plugin_name
);
102 fprintf(stderr
, "Error setting clock override name callback: %s\n",
107 ret
= lttng_ust_trace_clock_set_description_cb(plugin_description
);
109 fprintf(stderr
, "Error setting clock override description callback: %s\n",
114 ret
= lttng_ust_enable_trace_clock_override();
116 fprintf(stderr
, "Error enabling clock override: %s\n",
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