1// RUN: %clang_tsan -O1 %s -o %t && not %t 2>&1 | FileCheck %s
2#include <pthread.h>
3#include <stdio.h>
4#include <stdlib.h>
5#include <signal.h>
6#include <sys/types.h>
7#include <unistd.h>
8#include <errno.h>
9
10pthread_t mainth;
11volatile int done;
12
13static void MyHandler(int, siginfo_t *s, void *c) {
14  errno = 1;
15  done = 1;
16}
17
18static void* sendsignal(void *p) {
19  pthread_kill(mainth, SIGPROF);
20  return 0;
21}
22
23int main() {
24  mainth = pthread_self();
25  struct sigaction act = {};
26  act.sa_sigaction = &MyHandler;
27  sigaction(SIGPROF, &act, 0);
28  pthread_t th;
29  pthread_create(&th, 0, sendsignal, 0);
30  while (done == 0) {
31    volatile char *p = (char*)malloc(1);
32    p[0] = 0;
33    free((void*)p);
34    pthread_yield();
35  }
36  pthread_join(th, 0);
37  return 0;
38}
39
40// CHECK: WARNING: ThreadSanitizer: signal handler spoils errno
41// CHECK:     #0 MyHandler(int, siginfo{{(_t)?}}*, void*) {{.*}}signal_errno.cc
42// CHECK: SUMMARY: ThreadSanitizer: signal handler spoils errno{{.*}}MyHandler
43
44