[libc-commits] [libc] [libc] Add <unistd.h> functions for managing foreground process group IDs (PR #220121)

[Alexey Samsonov via libc-commits]

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@@ -0,0 +1,45 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// Unittests for tcgetpgrp.
+///
+//===----------------------------------------------------------------------===//
+
+#include "hdr/errno_macros.h"
+#include "hdr/fcntl_macros.h"
+#include "hdr/sys_stat_macros.h"
+#include "src/fcntl/open.h"
+#include "src/unistd/close.h"
+#include "src/unistd/tcgetpgrp.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
+#include "test/UnitTest/ErrnoSetterMatcher.h"
+#include "test/UnitTest/Test.h"
+
+using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
+using LlvmLibcTcGetPgrpTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
+
+// It's hard to test tcgetpgrp in unit tests, as the test process
+// is not typically associated with a terminal. We can probably achieve
+// this with fork()-ing a child process and creating the pseudo-terminal
+// fixture, but given that tcgetpgrp is a simple ioctl() wrapper (on Linux),
+// this complexity is likely not justified.
+
+TEST_F(LlvmLibcTcGetPgrpTest, BadFd) {
+  ASSERT_THAT(LIBC_NAMESPACE::tcgetpgrp(-1), Fails<pid_t>(EBADF));
+}
+
+TEST_F(LlvmLibcTcGetPgrpTest, NonTerminalFd) {
+  constexpr const char *FILENAME = "tcgetpgrp.test";
+  auto test_file = libc_make_test_file_path(FILENAME);
+  int fd = LIBC_NAMESPACE::open(test_file, O_WRONLY | O_CREAT, S_IRWXU);
+  ASSERT_ERRNO_SUCCESS();
+  ASSERT_GT(fd, 0);
+  ASSERT_THAT(LIBC_NAMESPACE::tcgetpgrp(fd), Fails<pid_t>(ENOTTY));
+  ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
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vonosmas wrote:

Done

https://github.com/llvm/llvm-project/pull/220121