compiler-rt/test/tsan/Linux/user_fopen.cpp

   1 // RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4
   5 // Defined by tsan.
   6 extern "C" FILE *__interceptor_fopen(const char *file, const char *mode);
   7 extern "C" int __interceptor_fileno(FILE *f);
   8
   9 extern "C" FILE *fopen(const char *file, const char *mode) {
  10   static int first = 0;
  11   if (__sync_lock_test_and_set(&first, 1) == 0)
  12     printf("user fopen\n");
  13   return __interceptor_fopen(file, mode);
  14 }
  15
  16 extern "C" int fileno(FILE *f) {
  17   static int first = 0;
  18   if (__sync_lock_test_and_set(&first, 1) == 0)
  19     printf("user fileno\n");
  20   return 1;
  21 }
  22
  23 int main() {
  24   FILE *f = fopen("/dev/zero", "r");
  25   if (f) {
  26     char buf;
  27     fread(&buf, 1, 1, f);
  28     fclose(f);
  29   }
  30 }
  31
  32 // CHECK: user fopen
  33 // CHECK-NOT: ThreadSanitizer
  34