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Linux/tools/testing/selftests/rseq/basic_test.c

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  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                         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 
 38 int 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 
 54 init_thread_error:
 55         return -1;
 56 }
 57 

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