4 files changed, 139 insertions, 0 deletions
diff --git a/libc/test/src/time/CMakeLists.txt b/libc/test/src/time/CMakeLists.txt
index 03e5428..c8e113f 100644
--- a/libc/test/src/time/CMakeLists.txt
+++ b/libc/test/src/time/CMakeLists.txt
@@ -124,6 +124,21 @@ add_libc_test(
     libc.src.time.clock_getres
 )
 
+add_libc_test(
+  clock_settime_test
+  SUITE
+    libc_time_unittests
+  SRCS
+    clock_settime_test.cpp
+  DEPENDS
+    libc.src.time.clock_settime
+    libc.hdr.types.time_t
+    libc.hdr.types.struct_timespec
+    libc.hdr.time_macros
+    libc.hdr.errno_macros
+    libc.test.UnitTest.ErrnoCheckingTest
+)
+
 add_libc_unittest(
   difftime_test
   SUITE
diff --git a/libc/test/src/time/clock_settime_test.cpp b/libc/test/src/time/clock_settime_test.cpp
new file mode 100644
index 0000000..ccbad9e
--- /dev/null
+++ b/libc/test/src/time/clock_settime_test.cpp
@@ -0,0 +1,54 @@
+//===-- Unittests for clock_settime ---------------------------------------===//
+//
+// 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 "hdr/time_macros.h"
+#include "hdr/types/struct_timespec.h"
+#include "src/time/clock_settime.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
+#include "test/UnitTest/Test.h"
+
+using LlvmLibcClockSetTime = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
+
+#ifdef CLOCK_MONOTONIC
+TEST_F(LlvmLibcClockSetTime, MonotonicIsNotSettable) {
+  timespec ts = {0, 0};
+  int result = LIBC_NAMESPACE::clock_settime(CLOCK_MONOTONIC, &ts);
+  ASSERT_EQ(result, -1);
+  ASSERT_ERRNO_EQ(EINVAL);
+}
+#endif // CLOCK_MONOTONIC
+
+TEST_F(LlvmLibcClockSetTime, InvalidClockId) {
+  timespec ts = {0, 0};
+  int result = LIBC_NAMESPACE::clock_settime(static_cast<clockid_t>(-1), &ts);
+  ASSERT_EQ(result, -1);
+  ASSERT_ERRNO_EQ(EINVAL);
+}
+
+TEST_F(LlvmLibcClockSetTime, InvalidTimespecNsec) {
+  timespec ts = {0, 1000000000L};
+  int result = LIBC_NAMESPACE::clock_settime(CLOCK_REALTIME, &ts);
+  ASSERT_EQ(result, -1);
+  ASSERT_ERRNO_EQ(EINVAL);
+}
+
+TEST_F(LlvmLibcClockSetTime, NullPointerIsEFAULT) {
+  int result = LIBC_NAMESPACE::clock_settime(CLOCK_REALTIME, nullptr);
+  ASSERT_EQ(result, -1);
+  ASSERT_ERRNO_EQ(EFAULT);
+}
+
+TEST_F(LlvmLibcClockSetTime, ClockIsSet) {
+  timespec ts = {0, 0};
+  int result = LIBC_NAMESPACE::clock_settime(CLOCK_REALTIME, &ts);
+  if (result == 0) {
+    ASSERT_ERRNO_SUCCESS();
+  } else {
+    ASSERT_ERRNO_EQ(EPERM);
+  }
+}
diff --git a/libc/test/src/unistd/CMakeLists.txt b/libc/test/src/unistd/CMakeLists.txt
index 0707053..3012ea9 100644
--- a/libc/test/src/unistd/CMakeLists.txt
+++ b/libc/test/src/unistd/CMakeLists.txt
@@ -147,6 +147,26 @@ add_libc_unittest(
 )
 
 add_libc_unittest(
+  fchown_test
+  SUITE
+    libc_unistd_unittests
+  SRCS
+    fchown_test.cpp
+  DEPENDS
+    libc.hdr.fcntl_macros
+    libc.include.unistd
+    libc.src.errno.errno
+    libc.src.unistd.fchown
+    libc.src.unistd.close
+    libc.src.unistd.unlink
+    libc.src.fcntl.open
+    libc.src.unistd.getuid
+    libc.src.unistd.getgid
+    libc.test.UnitTest.ErrnoCheckingTest
+    libc.test.UnitTest.ErrnoSetterMatcher
+)
+
+add_libc_unittest(
   ftruncate_test
   SUITE
     libc_unistd_unittests
diff --git a/libc/test/src/unistd/fchown_test.cpp b/libc/test/src/unistd/fchown_test.cpp
new file mode 100644
index 0000000..7954410
--- /dev/null
+++ b/libc/test/src/unistd/fchown_test.cpp
@@ -0,0 +1,50 @@
+//===-- Unittests for fchown ----------------------------------------------===//
+//
+// 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/fcntl/open.h"
+#include "src/unistd/close.h"
+#include "src/unistd/fchown.h"
+#include "src/unistd/getgid.h"
+#include "src/unistd/getuid.h"
+#include "src/unistd/unlink.h"
+
+#include "test/UnitTest/ErrnoCheckingTest.h"
+#include "test/UnitTest/ErrnoSetterMatcher.h"
+#include "test/UnitTest/Test.h"
+
+#include "hdr/fcntl_macros.h"
+#include <sys/stat.h>
+
+using LlvmLibcFchownTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
+
+TEST_F(LlvmLibcFchownTest, FchownSuccess) {
+  using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
+  uid_t my_uid = LIBC_NAMESPACE::getuid();
+  gid_t my_gid = LIBC_NAMESPACE::getgid();
+  constexpr const char *FILENAME = "fchown.test";
+  auto TEST_FILE = libc_make_test_file_path(FILENAME);
+
+  // Create a test file.
+  int write_fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU);
+  ASSERT_ERRNO_SUCCESS();
+  ASSERT_GT(write_fd, 0);
+
+  // Change the ownership of the file.
+  ASSERT_THAT(LIBC_NAMESPACE::fchown(write_fd, my_uid, my_gid), Succeeds(0));
+
+  // Close the file descriptor.
+  ASSERT_THAT(LIBC_NAMESPACE::close(write_fd), Succeeds(0));
+
+  // Clean up the test file.
+  ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0));
+}
+
+TEST_F(LlvmLibcFchownTest, FchownInvalidFileDescriptor) {
+  using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
+  ASSERT_THAT(LIBC_NAMESPACE::fchown(-1, 1000, 1000), Fails(EBADF));
+}