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 }
61