tests/regression/ust/clock-override/lttng-ust-clock-override-test.c

   1 /*
   2  * lttng-clock-override-test.c
   3  *
   4  * Copyright (C) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  * Copyright (C) 2015 Jonthan Rajotte <jonathan.rajotte-julien@efficios.com>
   6  *
   7  * SPDX-License-Identifier: MIT
   8  *
   9  * Based on lttng-clock-override-example.c from LTTng-ust example
  10  *
  11  */
  12
  13 #include <common/compat/time.hpp>
  14
  15 #include <lttng/lttng-export.h>
  16 #include <lttng/ust-clock.h>
  17
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21
  22 static uint64_t plugin_read64(void)
  23 {
  24         /* Freeze time */
  25         return 0;
  26 }
  27
  28 static uint64_t plugin_freq(void)
  29 {
  30         return 1000; /* 1KHz clock (very coarse!) */
  31 }
  32
  33 static int plugin_uuid(char *uuid)
  34 {
  35         const char myuuid[] = "83c63deb-7aa4-48fb-abda-946f400d76e6";
  36         memcpy(uuid, myuuid, LTTNG_UST_UUID_STR_LEN);
  37         return 0;
  38 }
  39
  40 static const char *plugin_name(void)
  41 {
  42         return "lttng_test_clock_override";
  43 }
  44
  45 static const char *plugin_description(void)
  46 {
  47         return "Freeze time with 1KHz for regression test";
  48 }
  49
  50 LTTNG_EXPORT void lttng_ust_clock_plugin_init(void);
  51 void lttng_ust_clock_plugin_init(void)
  52 {
  53         int ret;
  54
  55         ret = lttng_ust_trace_clock_set_read64_cb(plugin_read64);
  56         if (ret) {
  57                 fprintf(stderr,
  58                         "Error setting clock override read64 callback: %s\n",
  59                         strerror(-ret));
  60                 goto error;
  61         }
  62         ret = lttng_ust_trace_clock_set_freq_cb(plugin_freq);
  63         if (ret) {
  64                 fprintf(stderr, "Error setting clock override freq callback: %s\n", strerror(-ret));
  65                 goto error;
  66         }
  67         ret = lttng_ust_trace_clock_set_uuid_cb(plugin_uuid);
  68         if (ret) {
  69                 fprintf(stderr, "Error setting clock override uuid callback: %s\n", strerror(-ret));
  70                 goto error;
  71         }
  72
  73         ret = lttng_ust_trace_clock_set_name_cb(plugin_name);
  74         if (ret) {
  75                 fprintf(stderr, "Error setting clock override name callback: %s\n", strerror(-ret));
  76                 goto error;
  77         }
  78
  79         ret = lttng_ust_trace_clock_set_description_cb(plugin_description);
  80         if (ret) {
  81                 fprintf(stderr,
  82                         "Error setting clock override description callback: %s\n",
  83                         strerror(-ret));
  84                 goto error;
  85         }
  86
  87         ret = lttng_ust_enable_trace_clock_override();
  88         if (ret) {
  89                 fprintf(stderr, "Error enabling clock override: %s\n", strerror(-ret));
  90                 goto error;
  91         }
  92
  93         return;
  94
  95 error:
  96         exit(EXIT_FAILURE);
  97 }