LXR linux/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
   9static 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
  19static 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
  30int test__perf_hooks(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}
  49