doc/examples/getcpu-override/lttng-ust-getcpu-override-example.c

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright (C) 2014 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  */
   6
   7 #include <stdlib.h>
   8 #include <time.h>
   9 #include <string.h>
  10 #include <stdio.h>
  11 #include <lttng/ust-getcpu.h>
  12
  13 static
  14 int plugin_getcpu(void)
  15 {
  16         /* Dummy: always return CPU 0. */
  17         return 0;
  18 }
  19
  20 /*
  21  * Entry-point called by liblttng-ust through dlsym();
  22  */
  23 void lttng_ust_getcpu_plugin_init(void);
  24 void lttng_ust_getcpu_plugin_init(void)
  25 {
  26         int ret;
  27
  28         ret = lttng_ust_getcpu_override(plugin_getcpu);
  29         if (ret) {
  30                 fprintf(stderr, "Error enabling getcpu override: %s\n",
  31                         strerror(-ret));
  32                 goto error;
  33         }
  34         return;
  35
  36 error:
  37         exit(EXIT_FAILURE);
  38 }