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// RUN: %clangxx_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
#include <stdio.h>
#include <stdlib.h>
// Defined by tsan.
extern "C" FILE *__interceptor_fopen(const char *file, const char *mode);
extern "C" int __interceptor_fileno(FILE *f);
extern "C" FILE *fopen(const char *file, const char *mode) {
static int first = 0;
if (__sync_lock_test_and_set(&first, 1) == 0)
printf("user fopen\n");
return __interceptor_fopen(file, mode);
}
extern "C" int fileno(FILE *f) {
static int first = 0;
if (__sync_lock_test_and_set(&first, 1) == 0)
printf("user fileno\n");
return 1;
}
int main() {
FILE *f = fopen("/dev/zero", "r");
if (f) {
char buf;
fread(&buf, 1, 1, f);
fclose(f);
}
}
// CHECK: user fopen
// CHECK-NOT: ThreadSanitizer
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