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