[libc-commits] [libc] [libc] Implement killpg (PR #237561)

[Pavel Labath via libc-commits]

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@@ -0,0 +1,38 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 killpg.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/signal/killpg.h"
+
+#include "hdr/errno_macros.h"
+#include "src/unistd/getpgrp.h"
+#include "test/UnitTest/ErrnoSetterMatcher.h"
+#include "test/UnitTest/Test.h"
+
+using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
+using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
+
+TEST(LlvmLibcKillpgTest, InvalidPgrp) {
+  // Negative process group ID must fail with EINVAL.
+  ASSERT_THAT(LIBC_NAMESPACE::killpg(-1, 0), Fails(EINVAL));
+}
+
+TEST(LlvmLibcKillpgTest, ZeroPgrpTargetsCallerGroup) {
+  // pgrp = 0 represents the caller's process group.
+  ASSERT_THAT(LIBC_NAMESPACE::killpg(0, 0), Succeeds(0));
+}
+
+TEST(LlvmLibcKillpgTest, ExplicitPgrp) {
+  // Sending signal 0 to our own process group should succeed.
----------------
labath wrote:

Strictly speaking, this does not send anything, as zero is not a valid signal. sig=0 just performs an  existence check.

https://github.com/llvm/llvm-project/pull/237561