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 <stdlib.h>
  14 #include <common/compat/time.h>
  15 #include <string.h>
  16 #include <stdio.h>
  17 #include <lttng/ust-clock.h>
  18
  19 static
  20 uint64_t plugin_read64(void)
  21 {
  22         /* Freeze time */
  23         return 0;
  24 }
  25
  26 static
  27 uint64_t plugin_freq(void)
  28 {
  29         return 1000;    /* 1KHz clock (very coarse!) */
  30 }
  31
  32 static
  33 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
  41 const char *plugin_name(void)
  42 {
  43         return "lttng_test_clock_override";
  44 }
  45
  46 static
  47 const char *plugin_description(void)
  48 {
  49         return "Freeze time with 1KHz for regression test";
  50 }
  51
  52 void lttng_ust_clock_plugin_init(void)
  53 {
  54         int ret;
  55
  56         ret = lttng_ust_trace_clock_set_read64_cb(plugin_read64);
  57         if (ret) {
  58                 fprintf(stderr, "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",
  65                         strerror(-ret));
  66                 goto error;
  67         }
  68         ret = lttng_ust_trace_clock_set_uuid_cb(plugin_uuid);
  69         if (ret) {
  70                 fprintf(stderr, "Error setting clock override uuid callback: %s\n",
  71                         strerror(-ret));
  72                 goto error;
  73         }
  74
  75         ret = lttng_ust_trace_clock_set_name_cb(plugin_name);
  76         if (ret) {
  77                 fprintf(stderr, "Error setting clock override name callback: %s\n",
  78                         strerror(-ret));
  79                 goto error;
  80         }
  81
  82         ret = lttng_ust_trace_clock_set_description_cb(plugin_description);
  83         if (ret) {
  84                 fprintf(stderr, "Error setting clock override description callback: %s\n",
  85                         strerror(-ret));
  86                 goto error;
  87         }
  88
  89         ret = lttng_ust_enable_trace_clock_override();
  90         if (ret) {
  91                 fprintf(stderr, "Error enabling clock override: %s\n",
  92                         strerror(-ret));
  93                 goto error;
  94         }
  95
  96         return;
  97
  98 error:
  99         exit(EXIT_FAILURE);
 100 }