[libc-commits] [libc] Reland: [libc] implement ioctl ([libc] implement ioctl #85890) (PR #90317)

[Nhat Nguyen via libc-commits]

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@@ -0,0 +1,27 @@
+//===-- Unittests for ioctl -----------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/errno/libc_errno.h"
+#include "src/sys/ioctl/ioctl.h"
+#include "test/UnitTest/ErrnoSetterMatcher.h"
+#include "test/UnitTest/LibcTest.h"
+#include "test/UnitTest/Test.h"
+
+#include <sys/syscall.h>
+#include <unistd.h>
+
+using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
+using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
+
+TEST(LlvmLibcIoctlTest, InvalidFileDescriptor) {
+  int fd = 10;
+  unsigned long request = 10;
+  int res = LIBC_NAMESPACE::ioctl(fd, request, NULL);
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changkhothuychung wrote:

@michaelrj-google do you have an idea what test can I use to always guarantee success ? From the other PR @nickdesaulniers nick
told me I dont need to test for this syscall because it is a linux syscall, and the current test file is fine. I tried a test that I expect to succeeds in the PR but that seems to fail in the CI. 

https://github.com/llvm/llvm-project/pull/90317