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Diffstat (limited to 'lib/tsan/lit_tests/user_fopen.cc')
-rw-r--r-- | lib/tsan/lit_tests/user_fopen.cc | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/lib/tsan/lit_tests/user_fopen.cc b/lib/tsan/lit_tests/user_fopen.cc new file mode 100644 index 000000000000..794d598719b4 --- /dev/null +++ b/lib/tsan/lit_tests/user_fopen.cc @@ -0,0 +1,34 @@ +// RUN: %clangxx_tsan -O1 %s -o %t && %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 + |