LXR linux/tools/testing/selftests/rseq/basic

   1// SPDX-License-Identifier: LGPL-2.1
   2/*
   3 * Basic test coverage for critical regions and rseq_current_cpu().
   4 */
   5
   6#define _GNU_SOURCE
   7#include <assert.h>
   8#include <sched.h>
   9#include <signal.h>
  10#include <stdio.h>
  11#include <string.h>
  12#include <sys/time.h>
  13
  14#include "rseq.h"
  15
  16void test_cpu_pointer(void)
  17{
  18        cpu_set_t affinity, test_affinity;
  19        int i;
  20
  21        sched_getaffinity(0, sizeof(affinity), &affinity);
  22        CPU_ZERO(&test_affinity);
  23        for (i = 0; i < CPU_SETSIZE; i++) {
  24                if (CPU_ISSET(i, &affinity)) {
  25                        CPU_SET(i, &test_affinity);
  26                        sched_setaffinity(0, sizeof(test_affinity),
  27                                        &test_affinity);
  28                        assert(sched_getcpu() == i);
  29                        assert(rseq_current_cpu() == i);
  30                        assert(rseq_current_cpu_raw() == i);
  31                        assert(rseq_cpu_start() == i);
  32                        CPU_CLR(i, &test_affinity);
  33                }
  34        }
  35        sched_setaffinity(0, sizeof(affinity), &affinity);
  36}
  37
  38int main(int argc, char **argv)
  39{
  40        if (rseq_register_current_thread()) {
  41                fprintf(stderr, "Error: rseq_register_current_thread(...) failed(%d): %s\n",
  42                        errno, strerror(errno));
  43                goto init_thread_error;
  44        }
  45        printf("testing current cpu\n");
  46        test_cpu_pointer();
  47        if (rseq_unregister_current_thread()) {
  48                fprintf(stderr, "Error: rseq_unregister_current_thread(...) failed(%d): %s\n",
  49                        errno, strerror(errno));
  50                goto init_thread_error;
  51        }
  52        return 0;
  53
  54init_thread_error:
  55        return -1;
  56}
  57