test/tsan/signal_errno.cc

   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
  10 pthread_t mainth;
  11 volatile int done;
  12
  13 static void MyHandler(int, siginfo_t *s, void *c) {
  14   errno = 1;
  15   done = 1;
  16 }
  17
  18 static void* sendsignal(void *p) {
  19   sleep(1);
  20   pthread_kill(mainth, SIGPROF);
  21   return 0;
  22 }
  23
  24 static __attribute__((noinline)) void loop() {
  25   while (done == 0) {
  26     volatile char *p = (char*)malloc(1);
  27     p[0] = 0;
  28     free((void*)p);
  29     pthread_yield();
  30   }
  31 }
  32
  33 int main() {
  34   mainth = pthread_self();
  35   struct sigaction act = {};
  36   act.sa_sigaction = &MyHandler;
  37   sigaction(SIGPROF, &act, 0);
  38   pthread_t th;
  39   pthread_create(&th, 0, sendsignal, 0);
  40   loop();
  41   pthread_join(th, 0);
  42   return 0;
  43 }
  44
  45 // CHECK: WARNING: ThreadSanitizer: signal handler spoils errno
  46 // CHECK:     #0 MyHandler(int, siginfo{{(_t)?}}*, void*) {{.*}}signal_errno.cc
  47 // CHECK:     main
  48 // CHECK: SUMMARY: ThreadSanitizer: signal handler spoils errno{{.*}}MyHandler
  49