1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
2 #include <arpa/inet.h>
3 #include <assert.h>
4 #include <netinet/in.h>
5 #include <pthread.h>
6 #include <stdio.h>
7 #include <stdlib.h>
8 #include <sys/socket.h>
9 #include <sys/types.h>
10 #include <unistd.h>
11
12 struct sockaddr_in addr4;
13 struct sockaddr_in6 addr6;
14 struct sockaddr *addr;
15 socklen_t addrlen;
16 int X;
17
ClientThread(void * x)18 void *ClientThread(void *x) {
19 int c = socket(addr->sa_family, SOCK_STREAM, IPPROTO_TCP);
20 X = 42;
21 if (connect(c, addr, addrlen)) {
22 perror("connect");
23 exit(1);
24 }
25 close(c);
26 return NULL;
27 }
28
main()29 int main() {
30 addr4.sin_family = AF_INET;
31 addr4.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
32 addr4.sin_port = INADDR_ANY;
33 addr = (struct sockaddr *)&addr4;
34 addrlen = sizeof(addr4);
35
36 int s = socket(addr->sa_family, SOCK_STREAM, IPPROTO_TCP);
37 if (s <= 0) {
38 // Try to fall-back to IPv6
39 addr6.sin6_family = AF_INET6;
40 addr6.sin6_addr = in6addr_loopback;
41 addr6.sin6_port = INADDR_ANY;
42 addr = (struct sockaddr *)&addr6;
43 addrlen = sizeof(addr6);
44 s = socket(addr->sa_family, SOCK_STREAM, IPPROTO_TCP);
45 }
46 assert(s > 0);
47
48 bind(s, addr, addrlen);
49 getsockname(s, addr, &addrlen);
50 listen(s, 10);
51 pthread_t t;
52 pthread_create(&t, 0, ClientThread, 0);
53 int c = accept(s, 0, 0);
54 X = 42;
55 pthread_join(t, 0);
56 close(c);
57 close(s);
58 fprintf(stderr, "OK\n");
59 }
60
61 // CHECK-NOT: WARNING: ThreadSanitizer: data race
62
63