tests/tracepoint/tracepoint_test.c

   1 /* Copyright (C) 2010 David Goulet <david.goulet@polymtl.ca>
   2  *
   3  * This library is free software; you can redistribute it and/or
   4  * modify it under the terms of the GNU Lesser General Public
   5  * License as published by the Free Software Foundation; either
   6  * version 2.1 of the License, or (at your option) any later version.
   7  *
   8  * This library is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * Lesser General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU Lesser General Public
  14  * License along with this library; if not, write to the Free Software
  15  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301 USA
  16  */
  17
  18 /*
  19  * This test is aimed at testing tracepoint *with* ust_marker :
  20  *
  21  * 1) tracepoint named : "ust_event"
  22  *      -) Probe 1 registered and recording the value 13 (x5)
  23  *      -) Probe 2 registered and recording the value 42 (x5)
  24  *      -) Probe 3 registered and recording the payload of the struct message
  25  *      but using a *different* tracepoint (event_msg)
  26  *
  27  * 2) tracepoint named : "ust_event2"
  28  *      -) Probe 4 registered and recording the value 42 (x100)
  29  */
  30
  31 #include <stdio.h>
  32 #include <ust/marker.h>
  33 #include "tracepoint_test.h"
  34
  35 DEFINE_TRACEPOINT(ust_event);
  36 DEFINE_TRACEPOINT(ust_event2);
  37
  38 static struct message msg_probe3 = {
  39         .payload = "probe3",
  40 };
  41
  42 /*
  43  * Probe 4 --> ust_event2
  44  *      Will record 100 times the value 42
  45  */
  46 void tp_probe4(void *data, unsigned int p4)
  47 {
  48         int i;
  49         for (i = 0; i < 100; i++) {
  50                 ust_marker_tp(event2, ust_event2, tp_probe4, "probe4 %u", p4);
  51         }
  52 }
  53
  54 /*
  55  * Probe 3 --> ust_event *and* event_msg (from inside)
  56  *      Will record the payload of msg_prob3 struct
  57  *      from the data pointer of the probe
  58  */
  59 void tp_probe3(void *data, unsigned int p3)
  60 {
  61         struct message *msg;
  62         msg = (struct message*) data;
  63         ust_marker_tp(event_msg, ust_event_msg,
  64                         tp_probe3, "probe %s", msg->payload);
  65 }
  66
  67 /*
  68  * Probe 2 --> ust_event
  69  *      Will record 5 times the number 13
  70  */
  71 void tp_probe2(void *data, unsigned int p2)
  72 {
  73         int i;
  74         for (i = 0; i < 5; i++) {
  75                 ust_marker_tp(event, ust_event, tp_probe2, "probe %u", 13);
  76         }
  77 }
  78
  79 /*
  80  * Probe 1 --> ust_event
  81  *      Will record 5 times the unsigned int v = 42
  82  */
  83 void tp_probe(void *data, unsigned int p1)
  84 {
  85         int i;
  86         for (i = 0; i < 5; i++) {
  87                 ust_marker_tp(event, ust_event, tp_probe, "probe %u", p1);
  88         }
  89 }
  90
  91 static void __attribute__((constructor)) init()
  92 {
  93         register_tracepoint(ust_event, tp_probe, NULL);
  94         register_tracepoint(ust_event, tp_probe2, NULL);
  95         register_tracepoint(ust_event, tp_probe3, &msg_probe3);
  96         register_tracepoint(ust_event2, tp_probe4, NULL);
  97 }
  98
  99 int main(int argc, char **argv) {
 100         unsigned int v = 42;
 101         /* Tracepoint 1 : ust_event */
 102         tracepoint(ust_event, v);
 103         /* Tracepoint 2 : ust_event2 */
 104         tracepoint(ust_event2, v);
 105
 106         return 0;
 107 }