[libc] [llvm] [libc] Migrate unistd tests to use ErrnoCheckingTest. (PR #132067)

via llvm-commits llvm-commits at lists.llvm.org
Wed Mar 19 10:32:44 PDT 2025 

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-libc

Author: Alexey Samsonov (vonosmas)

<details>
<summary>Changes</summary>

Use ErrnoCheckingTest harness added in d039af33096c0a83b03475a240d5e281e2271c44 for all unistd tests that verify errno values. Stop explicitly setting it to zero in test code, as harness does it.

It also verifies that the errno is zero at the end of each test case, so update the ASSERT_ERRNO_EQ and ASSERT_ERRNO_FAILURE macro to clear out its value after the verification (similar to how ErrnoSetterMatcher does).

Update the CMake and Bazel rules for those tests. In the latter case, remove commented out tests that are currently unsupported in Bazel, since they get stale quickly.

---

Patch is 54.50 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/132067.diff


30 Files Affected:

- (modified) libc/test/UnitTest/Test.h (+4-2) 
- (modified) libc/test/src/unistd/CMakeLists.txt (+42) 
- (modified) libc/test/src/unistd/access_test.cpp (+13-18) 
- (modified) libc/test/src/unistd/chdir_test.cpp (+5-6) 
- (modified) libc/test/src/unistd/dup2_test.cpp (+5-4) 
- (modified) libc/test/src/unistd/dup3_test.cpp (+5-4) 
- (modified) libc/test/src/unistd/dup_test.cpp (+5-4) 
- (modified) libc/test/src/unistd/fchdir_test.cpp (+5-7) 
- (modified) libc/test/src/unistd/fpathconf_test.cpp (+7-2) 
- (modified) libc/test/src/unistd/ftruncate_test.cpp (+4-4) 
- (modified) libc/test/src/unistd/getentropy_test.cpp (+5-3) 
- (modified) libc/test/src/unistd/getsid_test.cpp (+4-2) 
- (modified) libc/test/src/unistd/isatty_test.cpp (+8-9) 
- (modified) libc/test/src/unistd/link_test.cpp (+5-4) 
- (modified) libc/test/src/unistd/linkat_test.cpp (+5-4) 
- (modified) libc/test/src/unistd/lseek_test.cpp (+5-3) 
- (modified) libc/test/src/unistd/pathconf_test.cpp (+7-2) 
- (modified) libc/test/src/unistd/pipe2_test.cpp (+4-3) 
- (modified) libc/test/src/unistd/pipe_test.cpp (+3-1) 
- (modified) libc/test/src/unistd/pread_pwrite_test.cpp (+6-4) 
- (modified) libc/test/src/unistd/read_write_test.cpp (+6-4) 
- (modified) libc/test/src/unistd/readlink_test.cpp (+4-4) 
- (modified) libc/test/src/unistd/readlinkat_test.cpp (+4-4) 
- (modified) libc/test/src/unistd/rmdir_test.cpp (+5-3) 
- (modified) libc/test/src/unistd/symlink_test.cpp (+5-4) 
- (modified) libc/test/src/unistd/symlinkat_test.cpp (+5-4) 
- (modified) libc/test/src/unistd/syscall_test.cpp (+6-7) 
- (modified) libc/test/src/unistd/truncate_test.cpp (+5-4) 
- (modified) libc/test/src/unistd/unlinkat_test.cpp (+5-3) 
- (modified) utils/bazel/llvm-project-overlay/libc/test/src/unistd/BUILD.bazel (+31-99) 


``````````diff
diff --git a/libc/test/UnitTest/Test.h b/libc/test/UnitTest/Test.h
index c7729606000c4..907ae1e59e511 100644
--- a/libc/test/UnitTest/Test.h
+++ b/libc/test/UnitTest/Test.h
@@ -41,10 +41,12 @@
 // they all provide.
 
 #define ASSERT_ERRNO_EQ(VAL)                                                   \
-  ASSERT_EQ(VAL, static_cast<int>(LIBC_NAMESPACE::libc_errno))
+  ASSERT_EQ(VAL, static_cast<int>(LIBC_NAMESPACE::libc_errno));                \
+  LIBC_NAMESPACE::libc_errno = 0
 #define ASSERT_ERRNO_SUCCESS()                                                 \
   ASSERT_EQ(0, static_cast<int>(LIBC_NAMESPACE::libc_errno))
 #define ASSERT_ERRNO_FAILURE()                                                 \
-  ASSERT_NE(0, static_cast<int>(LIBC_NAMESPACE::libc_errno))
+  ASSERT_NE(0, static_cast<int>(LIBC_NAMESPACE::libc_errno));                  \
+  LIBC_NAMESPACE::libc_errno = 0
 
 #endif // LLVM_LIBC_TEST_UNITTEST_TEST_H
diff --git a/libc/test/src/unistd/CMakeLists.txt b/libc/test/src/unistd/CMakeLists.txt
index c31a03d4b27a5..9aec6150af0ec 100644
--- a/libc/test/src/unistd/CMakeLists.txt
+++ b/libc/test/src/unistd/CMakeLists.txt
@@ -15,6 +15,8 @@ add_libc_unittest(
     libc.src.unistd.access
     libc.src.unistd.close
     libc.src.unistd.unlink
+    libc.test.UnitTest.ErrnoCheckingTest
+    libc.test.UnitTest.ErrnoSetterMatcher
 )
 
 add_libc_unittest(
@@ -30,6 +32,7 @@ add_libc_unittest(
     libc.src.unistd.chdir
     libc.src.unistd.close
     libc.src.fcntl.open
+    libc.test.UnitTest.ErrnoCheckingTest
     libc.test.UnitTest.ErrnoSetterMatcher
 )
 
@@ -48,6 +51,7 @@ add_libc_unittest(
     libc.src.unistd.read
     libc.src.unistd.unlink
     libc.src.unistd.write
+    libc.test.UnitTest.ErrnoCheckingTest
     libc.test.UnitTest.ErrnoSetterMatcher
 )
 
@@ -66,6 +70,7 @@ add_libc_unittest(
     libc.src.unistd.read
     libc.src.unistd.unlink
     libc.src.unistd.write
+    libc.test.UnitTest.ErrnoCheckingTest
     libc.test.UnitTest.ErrnoSetterMatcher
 )
 
@@ -84,6 +89,7 @@ add_libc_unittest(
     libc.src.unistd.read
     libc.src.unistd.unlink
     libc.src.unistd.write
+    libc.test.UnitTest.ErrnoCheckingTest
     libc.test.UnitTest.ErrnoSetterMatcher
 )
 
@@ -99,6 +105,7 @@ add_libc_unittest(
     libc.src.fcntl.open
     libc.src.unistd.fchdir
     libc.src.unistd.close
+    libc.test.UnitTest.ErrnoCheckingTest
     libc.test.UnitTest.ErrnoSetterMatcher
 )
 
@@ -118,6 +125,8 @@ add_libc_unittest(
     libc.src.unistd.unlink
     libc.src.unistd.write
     libc.src.__support.CPP.string_view
+    libc.test.UnitTest.ErrnoCheckingTest
+    libc.test.UnitTest.ErrnoSetterMatcher
 )
 
 add_libc_unittest(
@@ -136,6 +145,7 @@ add_libc_unittest(
     libc.src.unistd.pwrite
     libc.src.unistd.unlink
     libc.src.unistd.write
+    libc.test.UnitTest.ErrnoCheckingTest
     libc.test.UnitTest.ErrnoSetterMatcher
 )
 
@@ -154,6 +164,7 @@ add_libc_unittest(
     libc.src.unistd.read
     libc.src.unistd.write
     libc.src.stdio.remove
+    libc.test.UnitTest.ErrnoCheckingTest
     libc.test.UnitTest.ErrnoSetterMatcher
 )
 
@@ -170,6 +181,8 @@ add_libc_unittest(
     libc.src.unistd.close
     libc.src.unistd.link
     libc.src.unistd.unlink
+    libc.test.UnitTest.ErrnoCheckingTest
+    libc.test.UnitTest.ErrnoSetterMatcher
 )
 
 add_libc_unittest(
@@ -185,6 +198,8 @@ add_libc_unittest(
     libc.src.unistd.close
     libc.src.unistd.linkat
     libc.src.unistd.unlink
+    libc.test.UnitTest.ErrnoCheckingTest
+    libc.test.UnitTest.ErrnoSetterMatcher
 )
 
 add_libc_unittest(
@@ -200,6 +215,7 @@ add_libc_unittest(
     libc.src.unistd.close
     libc.src.unistd.lseek
     libc.src.unistd.read
+    libc.test.UnitTest.ErrnoCheckingTest
     libc.test.UnitTest.ErrnoSetterMatcher
 )
 
@@ -214,6 +230,7 @@ add_libc_unittest(
     libc.src.errno.errno
     libc.src.unistd.close
     libc.src.unistd.pipe
+    libc.test.UnitTest.ErrnoCheckingTest
     libc.test.UnitTest.ErrnoSetterMatcher
 )
 
@@ -228,6 +245,7 @@ add_libc_unittest(
     libc.src.errno.errno
     libc.src.unistd.close
     libc.src.unistd.pipe2
+    libc.test.UnitTest.ErrnoCheckingTest
     libc.test.UnitTest.ErrnoSetterMatcher
 )
 
@@ -242,6 +260,8 @@ add_libc_unittest(
     libc.src.errno.errno
     libc.src.sys.stat.mkdir
     libc.src.unistd.rmdir
+    libc.test.UnitTest.ErrnoCheckingTest
+    libc.test.UnitTest.ErrnoSetterMatcher
 )
 
 add_libc_unittest(
@@ -268,6 +288,8 @@ add_libc_unittest(
     libc.src.unistd.symlink
     libc.src.unistd.unlink
     libc.src.__support.CPP.string_view
+    libc.test.UnitTest.ErrnoCheckingTest
+    libc.test.UnitTest.ErrnoSetterMatcher
 )
 
 add_libc_unittest(
@@ -285,6 +307,8 @@ add_libc_unittest(
     libc.src.unistd.symlink
     libc.src.unistd.unlink
     libc.src.__support.CPP.string_view
+    libc.test.UnitTest.ErrnoCheckingTest
+    libc.test.UnitTest.ErrnoSetterMatcher
 )
 
 add_libc_unittest(
@@ -310,6 +334,8 @@ add_libc_unittest(
     libc.src.unistd.close
     libc.src.unistd.symlink
     libc.src.unistd.unlink
+    libc.test.UnitTest.ErrnoCheckingTest
+    libc.test.UnitTest.ErrnoSetterMatcher
 )
 
 add_libc_unittest(
@@ -325,6 +351,8 @@ add_libc_unittest(
     libc.src.unistd.close
     libc.src.unistd.symlinkat
     libc.src.unistd.unlink
+    libc.test.UnitTest.ErrnoCheckingTest
+    libc.test.UnitTest.ErrnoSetterMatcher
 )
 
 add_libc_unittest(
@@ -343,6 +371,8 @@ add_libc_unittest(
     libc.src.unistd.unlink
     libc.src.unistd.write
     libc.src.__support.CPP.string_view
+    libc.test.UnitTest.ErrnoCheckingTest
+    libc.test.UnitTest.ErrnoSetterMatcher
 )
 
 add_libc_unittest(
@@ -374,6 +404,8 @@ add_libc_unittest(
     libc.src.fcntl.openat
     libc.src.unistd.close
     libc.src.unistd.unlinkat
+    libc.test.UnitTest.ErrnoCheckingTest
+    libc.test.UnitTest.ErrnoSetterMatcher
 )
 
 add_libc_unittest(
@@ -404,6 +436,8 @@ add_libc_unittest(
     getsid_test.cpp
   DEPENDS
     libc.src.unistd.getsid
+    libc.test.UnitTest.ErrnoCheckingTest
+    libc.test.UnitTest.ErrnoSetterMatcher
 )
 
 add_libc_unittest(
@@ -427,6 +461,8 @@ add_libc_unittest(
     libc.src.fcntl.open
     libc.src.unistd.close
     libc.src.errno.errno
+    libc.test.UnitTest.ErrnoCheckingTest
+    libc.test.UnitTest.ErrnoSetterMatcher
 )
 
 add_libc_unittest(
@@ -451,6 +487,7 @@ add_libc_unittest(
     libc.include.sys_syscall
     libc.src.errno.errno
     libc.src.unistd.__llvm_libc_syscall
+    libc.test.UnitTest.ErrnoCheckingTest
     libc.test.UnitTest.ErrnoSetterMatcher
 )
 
@@ -479,6 +516,8 @@ add_libc_unittest(
     libc.src.unistd.fpathconf
     libc.src.fcntl.open
     libc.src.unistd.close
+    libc.test.UnitTest.ErrnoCheckingTest
+    libc.test.UnitTest.ErrnoSetterMatcher
 )
 
 add_libc_unittest(
@@ -494,6 +533,8 @@ add_libc_unittest(
     libc.src.unistd.pathconf
     libc.src.fcntl.open
     libc.src.unistd.close
+    libc.test.UnitTest.ErrnoCheckingTest
+    libc.test.UnitTest.ErrnoSetterMatcher
 )
 
 add_libc_test(
@@ -519,6 +560,7 @@ add_libc_test(
   DEPENDS
     libc.src.unistd.getentropy
     libc.src.errno.errno
+    libc.test.UnitTest.ErrnoCheckingTest
     libc.test.UnitTest.ErrnoSetterMatcher
 )
 
diff --git a/libc/test/src/unistd/access_test.cpp b/libc/test/src/unistd/access_test.cpp
index 0643b2b992a5c..375227fe348b8 100644
--- a/libc/test/src/unistd/access_test.cpp
+++ b/libc/test/src/unistd/access_test.cpp
@@ -6,22 +6,24 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "src/errno/libc_errno.h"
 #include "src/fcntl/open.h"
 #include "src/unistd/access.h"
 #include "src/unistd/close.h"
 #include "src/unistd/unlink.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
 #include "test/UnitTest/ErrnoSetterMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include <sys/stat.h>
 #include <unistd.h>
 
-TEST(LlvmLibcAccessTest, CreateAndTest) {
+using LlvmLibcAccessTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
+
+TEST_F(LlvmLibcAccessTest, CreateAndTest) {
   // The test strategy is to repeatedly create a file in different modes and
   // test that it is accessable in those modes but not in others.
-  LIBC_NAMESPACE::libc_errno = 0;
   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
+  using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
   constexpr const char *FILENAME = "access.test";
   auto TEST_FILE = libc_make_test_file_path(FILENAME);
   int fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU);
@@ -29,30 +31,23 @@ TEST(LlvmLibcAccessTest, CreateAndTest) {
   ASSERT_GT(fd, 0);
   ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
 
-  ASSERT_EQ(LIBC_NAMESPACE::access(TEST_FILE, F_OK), 0);
-  ASSERT_ERRNO_SUCCESS();
-  ASSERT_EQ(LIBC_NAMESPACE::access(TEST_FILE, X_OK | W_OK | R_OK), 0);
-  ASSERT_ERRNO_SUCCESS();
+  ASSERT_THAT(LIBC_NAMESPACE::access(TEST_FILE, F_OK), Succeeds(0));
+  ASSERT_THAT(LIBC_NAMESPACE::access(TEST_FILE, X_OK | W_OK | R_OK),
+              Succeeds(0));
   ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0));
 
   fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY | O_CREAT, S_IXUSR);
   ASSERT_ERRNO_SUCCESS();
   ASSERT_GT(fd, 0);
   ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
-  ASSERT_EQ(LIBC_NAMESPACE::access(TEST_FILE, F_OK), 0);
-  ASSERT_ERRNO_SUCCESS();
-  ASSERT_EQ(LIBC_NAMESPACE::access(TEST_FILE, X_OK), 0);
-  ASSERT_ERRNO_SUCCESS();
-  ASSERT_EQ(LIBC_NAMESPACE::access(TEST_FILE, R_OK), -1);
-  ASSERT_ERRNO_EQ(EACCES);
-  LIBC_NAMESPACE::libc_errno = 0;
-  ASSERT_EQ(LIBC_NAMESPACE::access(TEST_FILE, W_OK), -1);
-  ASSERT_ERRNO_EQ(EACCES);
-  LIBC_NAMESPACE::libc_errno = 0;
+  ASSERT_THAT(LIBC_NAMESPACE::access(TEST_FILE, F_OK), Succeeds(0));
+  ASSERT_THAT(LIBC_NAMESPACE::access(TEST_FILE, X_OK), Succeeds(0));
+  ASSERT_THAT(LIBC_NAMESPACE::access(TEST_FILE, R_OK), Fails(EACCES));
+  ASSERT_THAT(LIBC_NAMESPACE::access(TEST_FILE, W_OK), Fails(EACCES));
   ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0));
 }
 
-TEST(LlvmLibcAccessTest, AccessNonExistentFile) {
+TEST_F(LlvmLibcAccessTest, AccessNonExistentFile) {
   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
   ASSERT_THAT(LIBC_NAMESPACE::access("testdata/non-existent-file", F_OK),
               Fails(ENOENT));
diff --git a/libc/test/src/unistd/chdir_test.cpp b/libc/test/src/unistd/chdir_test.cpp
index e1bdcd77119f7..ac5217bbd2461 100644
--- a/libc/test/src/unistd/chdir_test.cpp
+++ b/libc/test/src/unistd/chdir_test.cpp
@@ -6,16 +6,18 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "src/errno/libc_errno.h"
 #include "src/fcntl/open.h"
 #include "src/unistd/chdir.h"
 #include "src/unistd/close.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
 #include "test/UnitTest/ErrnoSetterMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/fcntl_macros.h"
 
-TEST(LlvmLibcChdirTest, ChangeAndOpen) {
+using LlvmLibcChdirTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
+
+TEST_F(LlvmLibcChdirTest, ChangeAndOpen) {
   // The idea of this test is that we will first open an existing test file
   // without changing the directory to make sure it exists. Next, we change
   // directory and open the same file to make sure that the "chdir" operation
@@ -27,7 +29,6 @@ TEST(LlvmLibcChdirTest, ChangeAndOpen) {
   auto TEST_FILE = libc_make_test_file_path(FILENAME2);
   constexpr const char *FILENAME3 = "chdir.test";
   auto TEST_FILE_BASE = libc_make_test_file_path(FILENAME3);
-  LIBC_NAMESPACE::libc_errno = 0;
 
   int fd = LIBC_NAMESPACE::open(TEST_FILE, O_PATH);
   ASSERT_GT(fd, 0);
@@ -41,9 +42,7 @@ TEST(LlvmLibcChdirTest, ChangeAndOpen) {
   ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
 }
 
-TEST(LlvmLibcChdirTest, ChangeToNonExistentDir) {
-  LIBC_NAMESPACE::libc_errno = 0;
+TEST_F(LlvmLibcChdirTest, ChangeToNonExistentDir) {
   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
   ASSERT_THAT(LIBC_NAMESPACE::chdir("non-existent-dir"), Fails(ENOENT));
-  LIBC_NAMESPACE::libc_errno = 0;
 }
diff --git a/libc/test/src/unistd/dup2_test.cpp b/libc/test/src/unistd/dup2_test.cpp
index 2b2b3f3eef9a8..f6d546def33ec 100644
--- a/libc/test/src/unistd/dup2_test.cpp
+++ b/libc/test/src/unistd/dup2_test.cpp
@@ -6,21 +6,22 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "src/errno/libc_errno.h"
 #include "src/fcntl/open.h"
 #include "src/unistd/close.h"
 #include "src/unistd/dup2.h"
 #include "src/unistd/read.h"
 #include "src/unistd/unlink.h"
 #include "src/unistd/write.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
 #include "test/UnitTest/ErrnoSetterMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include <sys/stat.h>
 
-TEST(LlvmLibcdupTest, ReadAndWriteViaDup) {
+using LlvmLibcdupTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
+
+TEST_F(LlvmLibcdupTest, ReadAndWriteViaDup) {
   constexpr int DUPFD = 0xD0;
-  LIBC_NAMESPACE::libc_errno = 0;
   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
   constexpr const char *FILENAME = "dup2.test";
   auto TEST_FILE = libc_make_test_file_path(FILENAME);
@@ -59,7 +60,7 @@ TEST(LlvmLibcdupTest, ReadAndWriteViaDup) {
   ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0));
 }
 
-TEST(LlvmLibcdupTest, DupBadFD) {
+TEST_F(LlvmLibcdupTest, DupBadFD) {
   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
   ASSERT_THAT(LIBC_NAMESPACE::dup2(-1, 123), Fails(EBADF));
 }
diff --git a/libc/test/src/unistd/dup3_test.cpp b/libc/test/src/unistd/dup3_test.cpp
index 7b1c8e0e25190..598940b1c456d 100644
--- a/libc/test/src/unistd/dup3_test.cpp
+++ b/libc/test/src/unistd/dup3_test.cpp
@@ -6,26 +6,27 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "src/errno/libc_errno.h"
 #include "src/fcntl/open.h"
 #include "src/unistd/close.h"
 #include "src/unistd/dup3.h"
 #include "src/unistd/read.h"
 #include "src/unistd/unlink.h"
 #include "src/unistd/write.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
 #include "test/UnitTest/ErrnoSetterMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include <sys/stat.h>
 
+using LlvmLibcdupTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
+
 // The tests here are exactly the same as those of dup2. We only test the
 // plumbing of the dup3 syscall and not the dup3 functionality itself as it is
 // a simple syscall wrapper. Testing dup3 functionality is beyond the scope of
 // this test.
 
-TEST(LlvmLibcdupTest, ReadAndWriteViaDup) {
+TEST_F(LlvmLibcdupTest, ReadAndWriteViaDup) {
   constexpr int DUPFD = 0xD0;
-  LIBC_NAMESPACE::libc_errno = 0;
   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
   constexpr const char *FILENAME = "dup3.test";
@@ -65,7 +66,7 @@ TEST(LlvmLibcdupTest, ReadAndWriteViaDup) {
   ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0));
 }
 
-TEST(LlvmLibcdupTest, DupBadFD) {
+TEST_F(LlvmLibcdupTest, DupBadFD) {
   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
   ASSERT_THAT(LIBC_NAMESPACE::dup3(-1, 123, 0), Fails(EBADF));
 }
diff --git a/libc/test/src/unistd/dup_test.cpp b/libc/test/src/unistd/dup_test.cpp
index c7bf877142102..8e0b662c3961b 100644
--- a/libc/test/src/unistd/dup_test.cpp
+++ b/libc/test/src/unistd/dup_test.cpp
@@ -6,20 +6,21 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "src/errno/libc_errno.h"
 #include "src/fcntl/open.h"
 #include "src/unistd/close.h"
 #include "src/unistd/dup.h"
 #include "src/unistd/read.h"
 #include "src/unistd/unlink.h"
 #include "src/unistd/write.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
 #include "test/UnitTest/ErrnoSetterMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include <sys/stat.h>
 
-TEST(LlvmLibcdupTest, ReadAndWriteViaDup) {
-  LIBC_NAMESPACE::libc_errno = 0;
+using LlvmLibcdupTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
+
+TEST_F(LlvmLibcdupTest, ReadAndWriteViaDup) {
   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succeeds;
   constexpr const char *FILENAME = "dup.test";
   auto TEST_FILE = libc_make_test_file_path(FILENAME);
@@ -55,7 +56,7 @@ TEST(LlvmLibcdupTest, ReadAndWriteViaDup) {
   ASSERT_THAT(LIBC_NAMESPACE::unlink(TEST_FILE), Succeeds(0));
 }
 
-TEST(LlvmLibcdupTest, DupBadFD) {
+TEST_F(LlvmLibcdupTest, DupBadFD) {
   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
   ASSERT_THAT(LIBC_NAMESPACE::dup(-1), Fails(EBADF));
 }
diff --git a/libc/test/src/unistd/fchdir_test.cpp b/libc/test/src/unistd/fchdir_test.cpp
index 0e39fde17c67b..add56484a8e85 100644
--- a/libc/test/src/unistd/fchdir_test.cpp
+++ b/libc/test/src/unistd/fchdir_test.cpp
@@ -6,16 +6,18 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "src/errno/libc_errno.h"
 #include "src/fcntl/open.h"
 #include "src/unistd/close.h"
 #include "src/unistd/fchdir.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
 #include "test/UnitTest/ErrnoSetterMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include "hdr/fcntl_macros.h"
 
-TEST(LlvmLibcChdirTest, ChangeAndOpen) {
+using LlvmLibcChdirTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
+
+TEST_F(LlvmLibcChdirTest, ChangeAndOpen) {
   // The idea of this test is that we will first open an existing test file
   // without changing the directory to make sure it exists. Next, we change
   // directory and open the same file to make sure that the "fchdir" operation
@@ -27,7 +29,6 @@ TEST(LlvmLibcChdirTest, ChangeAndOpen) {
   auto TEST_FILE = libc_make_test_file_path(FILENAME2);
   constexpr const char *FILENAME3 = "fchdir.test";
   auto TEST_FILE_BASE = libc_make_test_file_path(FILENAME3);
-  LIBC_NAMESPACE::libc_errno = 0;
 
   int dir_fd = LIBC_NAMESPACE::open(TEST_DIR, O_DIRECTORY);
   ASSERT_GT(dir_fd, 0);
@@ -45,10 +46,7 @@ TEST(LlvmLibcChdirTest, ChangeAndOpen) {
   ASSERT_THAT(LIBC_NAMESPACE::close(dir_fd), Succeeds(0));
 }
 
-TEST(LlvmLibcChdirTest, ChangeToNonExistentDir) {
-  using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Fails;
-  LIBC_NAMESPACE::libc_errno = 0;
+TEST_F(LlvmLibcChdirTest, ChangeToNonExistentDir) {
   ASSERT_EQ(LIBC_NAMESPACE::fchdir(0), -1);
   ASSERT_ERRNO_FAILURE();
-  LIBC_NAMESPACE::libc_errno = 0;
 }
diff --git a/libc/test/src/unistd/fpathconf_test.cpp b/libc/test/src/unistd/fpathconf_test.cpp
index fe63e5e085973..3cba7ec5c66a8 100644
--- a/libc/test/src/unistd/fpathconf_test.cpp
+++ b/libc/test/src/unistd/fpathconf_test.cpp
@@ -12,19 +12,24 @@
 #include "src/fcntl/open.h"
 #include "src/unistd/close.h"
 #include "src/unistd/fpathconf.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
 #include "test/UnitTest/ErrnoSetterMatcher.h"
 #include "test/UnitTest/Test.h"
 
 using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
+using LlvmLibcFpathconfTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
 
-TEST(LlvmLibcPipeTest, SmokeTest) {
+TEST_F(LlvmLibcFpathconfTest, SmokeTest) {
   constexpr const char *FILENAME = "fpathconf.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);
+
   EXPECT_EQ(LIBC_NAMESPACE::fpathconf(fd, _PC_SYNC_IO), -1l);
   EXPECT_EQ(LIBC_NAMESPACE::fpathconf(fd, _PC_PATH_MAX),
             static_cast<long>(_POSIX_PATH_MAX));
-  LIBC_NAMESPACE::close(fd);
+  ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
 }
 
 // TODO: Functionality tests
diff --git a/libc/test/src/unistd/ftruncate_test.cpp b/libc/test/src/unistd/ftruncate_test.cpp
index 2fe4002692a87..c50a07f15f1e0 100644
--- a/libc/test/src/unistd/ftruncate_test.cpp
+++ b/libc/test/src/unistd/ftruncate_test.cpp
@@ -7,21 +7,22 @@
 //===----------------------------------------------------------------------===//
 
 #include "src/__support/CPP/string_view.h"
-#include "src/errno/libc_errno.h"
 #include "src/fcntl/open.h"
 #include "src/unistd/close.h"
 #include "src/unistd/ftruncate.h"
 #include "src/unistd/read.h"
 #include "src/unistd/unlink.h"
 #include "src/unistd/write.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
 #include "test/UnitTest/ErrnoSetterMatcher.h"
 #include "test/UnitTest/Test.h"
 
 #include <sys/stat.h>
 
 namespace cpp = LIBC_NAMESPACE::cpp;
+using LlvmLibcFtruncateTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
 
-TEST(LlvmLibcFtruncateTest, CreateAndTruncate) {
+TEST_F(LlvmLibcFtruncateTest, CreateAndTruncate) {
   using LIBC_NAMESPACE::testing::ErrnoSetterMatcher::Succe...
[truncated]

``````````

</details>


https://github.com/llvm/llvm-project/pull/132067

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