tools/testing/selftests/rseq/basic_test.c

   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
  16 void 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                         int node;
  26
  27                         CPU_SET(i, &test_affinity);
  28                         sched_setaffinity(0, sizeof(test_affinity),
  29                                         &test_affinity);
  30                         assert(sched_getcpu() == i);
  31                         assert(rseq_current_cpu() == i);
  32                         assert(rseq_current_cpu_raw() == i);
  33                         assert(rseq_cpu_start() == i);
  34                         node = rseq_fallback_current_node();
  35                         assert(rseq_current_node_id() == node);
  36                         CPU_CLR(i, &test_affinity);
  37                 }
  38         }
  39         sched_setaffinity(0, sizeof(affinity), &affinity);
  40 }
  41
  42 int main(int argc, char **argv)
  43 {
  44         if (rseq_register_current_thread()) {
  45                 fprintf(stderr, "Error: rseq_register_current_thread(...) failed(%d): %s\n",
  46                         errno, strerror(errno));
  47                 goto init_thread_error;
  48         }
  49         printf("testing current cpu\n");
  50         test_cpu_pointer();
  51         if (rseq_unregister_current_thread()) {
  52                 fprintf(stderr, "Error: rseq_unregister_current_thread(...) failed(%d): %s\n",
  53                         errno, strerror(errno));
  54                 goto init_thread_error;
  55         }
  56         return 0;
  57
  58 init_thread_error:
  59         return -1;
  60 }