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
  10 static 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
  20 static 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
  31 int 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 }