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 <dlfcn.h>
  13 #include <fcntl.h>
  14 #include <stdbool.h>
  15 #include <stdint.h>
  16 #include <stdio.h>
  17 #include <sys/stat.h>
  18 #include <sys/types.h>
  19
  20 #include <sys/sdt.h>
  21
  22 #include "foobar_provider.h"
  23 #include "libfoo.h"
  24 #include "sema.h"
  25
  26 int main(int argc, char *argv[])
  27 {
  28         void *handle;
  29         void (*bar_function)();
  30
  31         FOOBAR_TP1();
  32         FOOBAR_TP2();
  33         /*
  34          * This SDT tracepoint has an argument. Argument extraction is not support
  35          * at the moment but tracing of the tracepoint should work.
  36          */
  37         FOOBAR_TP_WITH_ARG(42);
  38
  39         /* Call function containing an SDT tracepoint in shared object */
  40         foo_function();
  41
  42         /*
  43          * Load a show shared object and call a function containing an SDT
  44          * tracepoint
  45          */
  46         handle = dlopen("libbar.so", RTLD_LAZY);
  47         if (!handle) {
  48                 fprintf(stderr, "Can't dlopen libbar.so");
  49                 return -1;
  50         }
  51         bar_function = (void (*)())dlsym(handle, "bar_function");
  52         bar_function();
  53         dlclose(handle);
  54
  55         /* This tracepoint has 2 callsites in this binary */
  56         FOOBAR_TP2();
  57
  58         /*
  59          * This function is defined in libfoo AND in libzzz. For a test, libzzz is
  60          * LD_PRELOADed and should override this function
  61          */
  62         overridable_function();
  63
  64         /*
  65          * This function is calling a SDT tracepoint that is guarded by a
  66          * semaphore.
  67          */
  68         sema_function();
  69         return 0;
  70 }
  71