tools/perf/tests/perf-hooks.c

   1 #include <signal.h>
   2 #include <stdlib.h>
   3
   4 #include "tests.h"
   5 #include "debug.h"
   6 #include "util.h"
   7 #include "perf-hooks.h"
   8
   9 static void sigsegv_handler(int sig __maybe_unused)
  10 {
  11         pr_debug("SIGSEGV is observed as expected, try to recover.\n");
  12         perf_hooks__recover();
  13         signal(SIGSEGV, SIG_DFL);
  14         raise(SIGSEGV);
  15         exit(-1);
  16 }
  17
  18
  19 static void the_hook(void *_hook_flags)
  20 {
  21         int *hook_flags = _hook_flags;
  22         int *p = NULL;
  23
  24         *hook_flags = 1234;
  25
  26         /* Generate a segfault, test perf_hooks__recover */
  27         *p = 0;
  28 }
  29
  30 int test__perf_hooks(struct test *test __maybe_unused, int subtest __maybe_unused)
  31 {
  32         int hook_flags = 0;
  33
  34         signal(SIGSEGV, sigsegv_handler);
  35         perf_hooks__set_hook("test", the_hook, &hook_flags);
  36         perf_hooks__invoke_test();
  37
  38         /* hook is triggered? */
  39         if (hook_flags != 1234) {
  40                 pr_debug("Setting failed: %d (%p)\n", hook_flags, &hook_flags);
  41                 return TEST_FAIL;
  42         }
  43
  44         /* the buggy hook is removed? */
  45         if (perf_hooks__get_hook("test"))
  46                 return TEST_FAIL;
  47         return TEST_OK;
  48 }