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/lttng-export.h>
  18 #include <lttng/ust-clock.h>
  19
  20 static
  21 uint64_t plugin_read64(void)
  22 {
  23         /* Freeze time */
  24         return 0;
  25 }
  26
  27 static
  28 uint64_t plugin_freq(void)
  29 {
  30         return 1000;    /* 1KHz clock (very coarse!) */
  31 }
  32
  33 static
  34 int plugin_uuid(char *uuid)
  35 {
  36         const char myuuid[] = "83c63deb-7aa4-48fb-abda-946f400d76e6";
  37         memcpy(uuid, myuuid, LTTNG_UST_UUID_STR_LEN);
  38         return 0;
  39 }
  40
  41 static
  42 const char *plugin_name(void)
  43 {
  44         return "lttng_test_clock_override";
  45 }
  46
  47 static
  48 const char *plugin_description(void)
  49 {
  50         return "Freeze time with 1KHz for regression test";
  51 }
  52
  53 LTTNG_EXPORT void lttng_ust_clock_plugin_init(void);
  54 void lttng_ust_clock_plugin_init(void)
  55 {
  56         int ret;
  57
  58         ret = lttng_ust_trace_clock_set_read64_cb(plugin_read64);
  59         if (ret) {
  60                 fprintf(stderr, "Error setting clock override read64 callback: %s\n",
  61                         strerror(-ret));
  62                 goto error;
  63         }
  64         ret = lttng_ust_trace_clock_set_freq_cb(plugin_freq);
  65         if (ret) {
  66                 fprintf(stderr, "Error setting clock override freq callback: %s\n",
  67                         strerror(-ret));
  68                 goto error;
  69         }
  70         ret = lttng_ust_trace_clock_set_uuid_cb(plugin_uuid);
  71         if (ret) {
  72                 fprintf(stderr, "Error setting clock override uuid callback: %s\n",
  73                         strerror(-ret));
  74                 goto error;
  75         }
  76
  77         ret = lttng_ust_trace_clock_set_name_cb(plugin_name);
  78         if (ret) {
  79                 fprintf(stderr, "Error setting clock override name callback: %s\n",
  80                         strerror(-ret));
  81                 goto error;
  82         }
  83
  84         ret = lttng_ust_trace_clock_set_description_cb(plugin_description);
  85         if (ret) {
  86                 fprintf(stderr, "Error setting clock override description callback: %s\n",
  87                         strerror(-ret));
  88                 goto error;
  89         }
  90
  91         ret = lttng_ust_enable_trace_clock_override();
  92         if (ret) {
  93                 fprintf(stderr, "Error enabling clock override: %s\n",
  94                         strerror(-ret));
  95                 goto error;
  96         }
  97
  98         return;
  99
 100 error:
 101         exit(EXIT_FAILURE);
 102 }