signal_errno.cc revision 86277eb844c4983c81de62d7c050e92fe7155788 
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
7pthread_t mainth;
8volatile int done;
9
10static void MyHandler(int, siginfo_t *s, void *c) {
11  errno = 1;
12  done = 1;
13}
14
15static void* sendsignal(void *p) {
16  barrier_wait(&barrier);
17  pthread_kill(mainth, SIGPROF);
18  return 0;
19}
20
21static __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
31int 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