tests/utils/testapp/userspace-probe-sdt-binary/userspace-probe-sdt-binary.c

   1 /*
   2  * Copyright (C) 2017 Francis Deslauriers <francis.deslauriers@efficios.com>
   3  *
   4  * SPDX-License-Identifier: LGPL-2.1-or-later
   5  *
   6  */
   7
   8 #ifndef _GNU_SOURCE
   9 #define _GNU_SOURCE
  10 #endif
  11
  12 #include "foobar_provider.h"
  13 #include "libfoo.h"
  14 #include "sema.h"
  15
  16 #include <dlfcn.h>
  17 #include <fcntl.h>
  18 #include <stdbool.h>
  19 #include <stdint.h>
  20 #include <stdio.h>
  21 #include <sys/sdt.h>
  22 #include <sys/stat.h>
  23 #include <sys/types.h>
  24
  25 int main(int argc, char *argv[])
  26 {
  27         void *handle;
  28         void (*bar_function)();
  29
  30         FOOBAR_TP1();
  31         FOOBAR_TP2();
  32         /*
  33          * This SDT tracepoint has an argument. Argument extraction is not supported
  34          * at the moment, but tracing of the tracepoint should work.
  35          */
  36         FOOBAR_TP_WITH_ARG(42);
  37
  38         /* Call a function containing an SDT tracepoint in shared object. */
  39         foo_function();
  40
  41         /*
  42          * Load a shared object and call a function containing an SDT
  43          * tracepoint
  44          */
  45         handle = dlopen("libbar.so", RTLD_LAZY);
  46         if (!handle) {
  47                 fprintf(stderr, "Can't dlopen libbar.so");
  48                 return -1;
  49         }
  50         bar_function = (void (*)()) dlsym(handle, "bar_function");
  51         bar_function();
  52         dlclose(handle);
  53
  54         /* This tracepoint has 2 call sites in this binary. */
  55         FOOBAR_TP2();
  56
  57         /*
  58          * This function is defined in libfoo and in libzzz. For a test, libzzz is
  59          * LD_PRELOADed and should override this function.
  60          */
  61         overridable_function();
  62
  63         /*
  64          * This function is calling a SDT tracepoint that is guarded by a
  65          * semaphore.
  66          */
  67         sema_function();
  68         return 0;
  69 }