LXR linux/tools/perf/tests/perf-hooks.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <signal.h>
   3#include <stdlib.h>
   4
   5#include "tests.h"
   6#include "debug.h"
   7#include "util.h"
   8#include "perf-hooks.h"
   9
  10static void sigsegv_handler(int sig __maybe_unused)
  11{
  12        pr_debug("SIGSEGV is observed as expected, try to recover.\n");
  13        perf_hooks__recover();
  14        signal(SIGSEGV, SIG_DFL);
  15        raise(SIGSEGV);
  16        exit(-1);
  17}
  18
  19
  20static void the_hook(void *_hook_flags)
  21{
  22        int *hook_flags = _hook_flags;
  23        int *p = NULL;
  24
  25        *hook_flags = 1234;
  26
  27        /* Generate a segfault, test perf_hooks__recover */
  28        *p = 0;
  29}
  30
  31int test__perf_hooks(struct test *test __maybe_unused, int subtest __maybe_unused)
  32{
  33        int hook_flags = 0;
  34
  35        signal(SIGSEGV, sigsegv_handler);
  36        perf_hooks__set_hook("test", the_hook, &hook_flags);
  37        perf_hooks__invoke_test();
  38
  39        /* hook is triggered? */
  40        if (hook_flags != 1234) {
  41                pr_debug("Setting failed: %d (%p)\n", hook_flags, &hook_flags);
  42                return TEST_FAIL;
  43        }
  44
  45        /* the buggy hook is removed? */
  46        if (perf_hooks__get_hook("test"))
  47                return TEST_FAIL;
  48        return TEST_OK;
  49}
  50