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Linux/tools/perf/tests/perf-hooks.c

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  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 "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 
 23         *hook_flags = 1234;
 24 
 25         /* Generate a segfault, test perf_hooks__recover */
 26         raise(SIGSEGV);
 27 }
 28 
 29 static int test__perf_hooks(struct test_suite *test __maybe_unused, int subtest __maybe_unused)
 30 {
 31         int hook_flags = 0;
 32 
 33         signal(SIGSEGV, sigsegv_handler);
 34         perf_hooks__set_hook("test", the_hook, &hook_flags);
 35         perf_hooks__invoke_test();
 36 
 37         /* hook is triggered? */
 38         if (hook_flags != 1234) {
 39                 pr_debug("Setting failed: %d (%p)\n", hook_flags, &hook_flags);
 40                 return TEST_FAIL;
 41         }
 42 
 43         /* the buggy hook is removed? */
 44         if (perf_hooks__get_hook("test"))
 45                 return TEST_FAIL;
 46         return TEST_OK;
 47 }
 48 
 49 DEFINE_SUITE("perf hooks", perf_hooks);
 50 

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