[clang-tidy] Add a close-on-exec check on dup() in Android module.

Summary:
dup() is better to be replaced by fcntl() to avoid file descriptor leakage.

Differential Revision: https://reviews.llvm.org/D35364

llvm-svn: 310858

1 files changed, 31 insertions, 0 deletions

diff --git a/clang-tools-extra/test/clang-tidy/android-cloexec-dup.cpp b/clang-tools-extra/test/clang-tidy/android-cloexec-dup.cpp
new file mode 100644
index 00000000000..f7011b8b835
--- /dev/null
+++ b/clang-tools-extra/test/clang-tidy/android-cloexec-dup.cpp
@@ -0,0 +1,31 @@
+// RUN: %check_clang_tidy %s android-cloexec-dup %t
+
+extern "C" int dup(int oldfd);
+void f() {
+  dup(1);
+  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: prefer fcntl() to dup() because fcntl() allows F_DUPFD_CLOEXEC [android-cloexec-dup]
+  // CHECK-FIXES: fcntl(1, F_DUPFD_CLOEXEC);
+  int oldfd = 0;
+  dup(oldfd);
+  // CHECK-MESSAGES: :[[@LINE-1]]:3: warning: prefer
+  // CHECK-FIXES: fcntl(oldfd, F_DUPFD_CLOEXEC);
+}
+
+namespace i {
+int dup(int oldfd);
+void g() {
+  dup(0);
+  int oldfd = 1;
+  dup(oldfd);
+}
+} // namespace i
+
+class C {
+public:
+  int dup(int oldfd);
+  void h() {
+    dup(0);
+    int oldfd = 1;
+    dup(oldfd);
+  }
+};