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  * Based on lttng-clock-override-example.c from LTTng-ust example
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  19  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  21  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  22  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  23  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  24  * SOFTWARE.
  25  */
  26
  27 #include <stdlib.h>
  28 #include <time.h>
  29 #include <string.h>
  30 #include <stdio.h>
  31 #include <lttng/ust-clock.h>
  32
  33 static
  34 uint64_t plugin_read64(void)
  35 {
  36         /* Freeze time */
  37         return 0;
  38 }
  39
  40 static
  41 uint64_t plugin_freq(void)
  42 {
  43         return 1000;    /* 1KHz clock (very coarse!) */
  44 }
  45
  46 static
  47 int plugin_uuid(char *uuid)
  48 {
  49         const char myuuid[] = "83c63deb-7aa4-48fb-abda-946f400d76e6";
  50         memcpy(uuid, myuuid, LTTNG_UST_UUID_STR_LEN);
  51         return 0;
  52 }
  53
  54 static
  55 const char *plugin_name(void)
  56 {
  57         return "lttng_test_clock_override";
  58 }
  59
  60 static
  61 const char *plugin_description(void)
  62 {
  63         return "Freeze time with 1KHz for regression test";
  64 }
  65
  66 void lttng_ust_clock_plugin_init(void)
  67 {
  68         int ret;
  69
  70         ret = lttng_ust_trace_clock_set_read64_cb(plugin_read64);
  71         if (ret) {
  72                 fprintf(stderr, "Error setting clock override read64 callback: %s\n",
  73                         strerror(-ret));
  74                 goto error;
  75         }
  76         ret = lttng_ust_trace_clock_set_freq_cb(plugin_freq);
  77         if (ret) {
  78                 fprintf(stderr, "Error setting clock override freq callback: %s\n",
  79                         strerror(-ret));
  80                 goto error;
  81         }
  82         ret = lttng_ust_trace_clock_set_uuid_cb(plugin_uuid);
  83         if (ret) {
  84                 fprintf(stderr, "Error setting clock override uuid callback: %s\n",
  85                         strerror(-ret));
  86                 goto error;
  87         }
  88
  89         ret = lttng_ust_trace_clock_set_name_cb(plugin_name);
  90         if (ret) {
  91                 fprintf(stderr, "Error setting clock override name callback: %s\n",
  92                         strerror(-ret));
  93                 goto error;
  94         }
  95
  96         ret = lttng_ust_trace_clock_set_description_cb(plugin_description);
  97         if (ret) {
  98                 fprintf(stderr, "Error setting clock override description callback: %s\n",
  99                         strerror(-ret));
 100                 goto error;
 101         }
 102
 103         ret = lttng_ust_enable_trace_clock_override();
 104         if (ret) {
 105                 fprintf(stderr, "Error enabling clock override: %s\n",
 106                         strerror(-ret));
 107                 goto error;
 108         }
 109
 110         return;
 111
 112 error:
 113         exit(EXIT_FAILURE);
 114 }