1 // RUN: %clang_tsan -O1 %s -o %t && %deflake %run %t | FileCheck %s
2 #include "test.h"
3 #include <signal.h>
4 #include <sys/types.h>
5 #include <errno.h>
6
7 pthread_t mainth;
8 volatile int done;
9
MyHandler(int,siginfo_t * s,void * c)10 static void MyHandler(int, siginfo_t *s, void *c) {
11 errno = 1;
12 done = 1;
13 }
14
sendsignal(void * p)15 static void* sendsignal(void *p) {
16 barrier_wait(&barrier);
17 pthread_kill(mainth, SIGPROF);
18 return 0;
19 }
20
loop()21 static __attribute__((noinline)) void loop() {
22 barrier_wait(&barrier);
23 while (done == 0) {
24 volatile char *p = (char*)malloc(1);
25 p[0] = 0;
26 free((void*)p);
27 pthread_yield();
28 }
29 }
30
main()31 int main() {
32 barrier_init(&barrier, 2);
33 mainth = pthread_self();
34 struct sigaction act = {};
35 act.sa_sigaction = &MyHandler;
36 sigaction(SIGPROF, &act, 0);
37 pthread_t th;
38 pthread_create(&th, 0, sendsignal, 0);
39 loop();
40 pthread_join(th, 0);
41 return 0;
42 }
43
44 // CHECK: WARNING: ThreadSanitizer: signal handler spoils errno
45 // CHECK: #0 MyHandler(int, {{(__)?}}siginfo{{(_t)?}}*, void*) {{.*}}signal_errno.cc
46 // CHECK: main
47 // CHECK: SUMMARY: ThreadSanitizer: signal handler spoils errno{{.*}}MyHandler
48
49