[libcxx] [clang] [llvm] Reapply "[libc++][streams] P1759R6: Native handles and file streams" (PR #77190)
via cfe-commits
cfe-commits at lists.llvm.org
Sat Jan 6 10:42:25 PST 2024
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-libcxx
Author: Hristo Hristov (H-G-Hristov)
<details>
<summary>Changes</summary>
Fixes build on Windows in C++26 mode.
Reverted in: https://github.com/llvm/llvm-project/commit/40c07b559aa6ab4bac074c943967d3207bc07ae0
Original PR: https://github.com/llvm/llvm-project/pull/76632
---
Patch is 35.28 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/77190.diff
25 Files Affected:
- (modified) libcxx/docs/FeatureTestMacroTable.rst (+1-1)
- (modified) libcxx/docs/ReleaseNotes/18.rst (+1)
- (modified) libcxx/docs/Status/Cxx2cPapers.csv (+1-1)
- (modified) libcxx/include/fstream (+50)
- (modified) libcxx/include/version (+1-1)
- (modified) libcxx/src/CMakeLists.txt (+1)
- (added) libcxx/src/fstream.cpp (+37)
- (added) libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/native_handle.assert.pass.cpp (+32)
- (added) libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/native_handle.pass.cpp (+58)
- (modified) libcxx/test/std/input.output/file.streams/fstreams/filebuf/types.pass.cpp (+8-1)
- (added) libcxx/test/std/input.output/file.streams/fstreams/fstream.members/native_handle.assert.pass.cpp (+32)
- (added) libcxx/test/std/input.output/file.streams/fstreams/fstream.members/native_handle.pass.cpp (+27)
- (modified) libcxx/test/std/input.output/file.streams/fstreams/fstream/types.pass.cpp (+8-1)
- (added) libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/native_handle.assert.pass.cpp (+32)
- (added) libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/native_handle.pass.cpp (+27)
- (modified) libcxx/test/std/input.output/file.streams/fstreams/ifstream/types.pass.cpp (+8-1)
- (added) libcxx/test/std/input.output/file.streams/fstreams/native_handle_assert_test_helpers.h (+28)
- (added) libcxx/test/std/input.output/file.streams/fstreams/native_handle_test_helpers.h (+84)
- (added) libcxx/test/std/input.output/file.streams/fstreams/ofstream.members/native_handle.assert.pass.cpp (+32)
- (added) libcxx/test/std/input.output/file.streams/fstreams/ofstream.members/native_handle.pass.cpp (+27)
- (modified) libcxx/test/std/input.output/file.streams/fstreams/ofstream/types.pass.cpp (+8-1)
- (modified) libcxx/test/std/input.output/file.streams/fstreams/types.h (+10)
- (modified) libcxx/test/std/language.support/support.limits/support.limits.general/fstream.version.compile.pass.cpp (+5-11)
- (modified) libcxx/test/std/language.support/support.limits/support.limits.general/version.version.compile.pass.cpp (+5-11)
- (modified) libcxx/utils/generate_feature_test_macro_components.py (-1)
``````````diff
diff --git a/libcxx/docs/FeatureTestMacroTable.rst b/libcxx/docs/FeatureTestMacroTable.rst
index 8ce5ec9f64ef9a..893a3b13ca06e0 100644
--- a/libcxx/docs/FeatureTestMacroTable.rst
+++ b/libcxx/docs/FeatureTestMacroTable.rst
@@ -418,7 +418,7 @@ Status
--------------------------------------------------- -----------------
``__cpp_lib_freestanding_variant`` *unimplemented*
--------------------------------------------------- -----------------
- ``__cpp_lib_fstream_native_handle`` *unimplemented*
+ ``__cpp_lib_fstream_native_handle`` ``202306L``
--------------------------------------------------- -----------------
``__cpp_lib_function_ref`` *unimplemented*
--------------------------------------------------- -----------------
diff --git a/libcxx/docs/ReleaseNotes/18.rst b/libcxx/docs/ReleaseNotes/18.rst
index cae2347be5fd61..882f53b8d9f83f 100644
--- a/libcxx/docs/ReleaseNotes/18.rst
+++ b/libcxx/docs/ReleaseNotes/18.rst
@@ -59,6 +59,7 @@ Implemented Papers
- P2909R4 - Fix formatting of code units as integers (Dude, where’s my ``char``?)
- P2821R5 - span.at()
- P0521R0 - Proposed Resolution for CA 14 (shared_ptr use_count/unique)
+- P1759R6 - Native handles and file streams
Improvements and New Features
diff --git a/libcxx/docs/Status/Cxx2cPapers.csv b/libcxx/docs/Status/Cxx2cPapers.csv
index fa4a112d143673..5701717f39766c 100644
--- a/libcxx/docs/Status/Cxx2cPapers.csv
+++ b/libcxx/docs/Status/Cxx2cPapers.csv
@@ -19,7 +19,7 @@
"`P2757R3 <https://wg21.link/P2757R3>`__","LWG","Type-checking format args","Varna June 2023","","","|format|"
"`P2637R3 <https://wg21.link/P2637R3>`__","LWG","Member ``visit``","Varna June 2023","","","|format|"
"`P2641R4 <https://wg21.link/P2641R4>`__","CWG, LWG","Checking if a ``union`` alternative is active","Varna June 2023","","",""
-"`P1759R6 <https://wg21.link/P1759R6>`__","LWG","Native handles and file streams","Varna June 2023","","",""
+"`P1759R6 <https://wg21.link/P1759R6>`__","LWG","Native handles and file streams","Varna June 2023","|Complete|","18.0",""
"`P2697R1 <https://wg21.link/P2697R1>`__","LWG","Interfacing ``bitset`` with ``string_view``","Varna June 2023","|Complete|","18.0",""
"`P1383R2 <https://wg21.link/P1383R2>`__","LWG","More ``constexpr`` for ``<cmath>`` and ``<complex>``","Varna June 2023","","",""
"`P2734R0 <https://wg21.link/P2734R0>`__","LWG","Adding the new SI prefixes","Varna June 2023","|Complete|","17.0",""
diff --git a/libcxx/include/fstream b/libcxx/include/fstream
index 7a4e15b55d56fe..203cc6dfb4b134 100644
--- a/libcxx/include/fstream
+++ b/libcxx/include/fstream
@@ -73,6 +73,7 @@ public:
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
+ using native_handle_type = typename basic_filebuf<charT, traits>::native_handle_type; // Since C++26
basic_ifstream();
explicit basic_ifstream(const char* s, ios_base::openmode mode = ios_base::in);
@@ -85,6 +86,7 @@ public:
void swap(basic_ifstream& rhs);
basic_filebuf<char_type, traits_type>* rdbuf() const;
+ native_handle_type native_handle() const noexcept; // Since C++26
bool is_open() const;
void open(const char* s, ios_base::openmode mode = ios_base::in);
void open(const string& s, ios_base::openmode mode = ios_base::in);
@@ -110,6 +112,7 @@ public:
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
+ using native_handle_type = typename basic_filebuf<charT, traits>::native_handle_type; // Since C++26
basic_ofstream();
explicit basic_ofstream(const char* s, ios_base::openmode mode = ios_base::out);
@@ -122,6 +125,8 @@ public:
void swap(basic_ofstream& rhs);
basic_filebuf<char_type, traits_type>* rdbuf() const;
+ native_handle_type native_handle() const noexcept; // Since C++26
+
bool is_open() const;
void open(const char* s, ios_base::openmode mode = ios_base::out);
void open(const string& s, ios_base::openmode mode = ios_base::out);
@@ -148,6 +153,7 @@ public:
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
+ using native_handle_type = typename basic_filebuf<charT, traits>::native_handle_type; // Since C++26
basic_fstream();
explicit basic_fstream(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out);
@@ -160,6 +166,7 @@ public:
void swap(basic_fstream& rhs);
basic_filebuf<char_type, traits_type>* rdbuf() const;
+ native_handle_type native_handle() const noexcept; // Since C++26
bool is_open() const;
void open(const char* s, ios_base::openmode mode = ios_base::in|ios_base::out);
void open(const string& s, ios_base::openmode mode = ios_base::in|ios_base::out);
@@ -210,6 +217,10 @@ _LIBCPP_PUSH_MACROS
_LIBCPP_BEGIN_NAMESPACE_STD
+# if _LIBCPP_STD_VER >= 26 && defined(_LIBCPP_WIN32API)
+_LIBCPP_EXPORTED_FROM_ABI void* __filebuf_windows_native_handle(FILE* __file) noexcept;
+# endif
+
template <class _CharT, class _Traits>
class _LIBCPP_TEMPLATE_VIS basic_filebuf : public basic_streambuf<_CharT, _Traits> {
public:
@@ -219,6 +230,15 @@ public:
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
typedef typename traits_type::state_type state_type;
+# if _LIBCPP_STD_VER >= 26
+# if defined(_LIBCPP_WIN32API)
+ using native_handle_type = void*; // HANDLE
+# elif __has_include(<unistd.h>)
+ using native_handle_type = int; // POSIX file descriptor
+# else
+# error "Provide a native file handle!"
+# endif
+# endif
// 27.9.1.2 Constructors/destructor:
basic_filebuf();
@@ -245,6 +265,18 @@ public:
# endif
_LIBCPP_HIDE_FROM_ABI basic_filebuf* __open(int __fd, ios_base::openmode __mode);
basic_filebuf* close();
+# if _LIBCPP_STD_VER >= 26
+ _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept {
+ _LIBCPP_ASSERT_UNCATEGORIZED(this->is_open(), "File must be opened");
+# if defined(_LIBCPP_WIN32API)
+ return std::__filebuf_windows_native_handle(__file_);
+# elif __has_include(<unistd.h>)
+ return fileno(__file_);
+# else
+# error "Provide a way to determine the file native handle!"
+# endif
+ }
+# endif // _LIBCPP_STD_VER >= 26
_LIBCPP_HIDE_FROM_ABI inline static const char* __make_mdstring(ios_base::openmode __mode) _NOEXCEPT;
@@ -1024,6 +1056,9 @@ public:
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
+# if _LIBCPP_STD_VER >= 26
+ using native_handle_type = typename basic_filebuf<_CharT, _Traits>::native_handle_type;
+# endif
_LIBCPP_HIDE_FROM_ABI basic_ifstream();
_LIBCPP_HIDE_FROM_ABI explicit basic_ifstream(const char* __s, ios_base::openmode __mode = ios_base::in);
@@ -1041,6 +1076,9 @@ public:
_LIBCPP_HIDE_FROM_ABI void swap(basic_ifstream& __rhs);
_LIBCPP_HIDE_FROM_ABI basic_filebuf<char_type, traits_type>* rdbuf() const;
+# if _LIBCPP_STD_VER >= 26
+ _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept { return rdbuf()->native_handle(); }
+# endif
_LIBCPP_HIDE_FROM_ABI bool is_open() const;
void open(const char* __s, ios_base::openmode __mode = ios_base::in);
# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
@@ -1171,6 +1209,9 @@ public:
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
+# if _LIBCPP_STD_VER >= 26
+ using native_handle_type = typename basic_filebuf<_CharT, _Traits>::native_handle_type;
+# endif
_LIBCPP_HIDE_FROM_ABI basic_ofstream();
_LIBCPP_HIDE_FROM_ABI explicit basic_ofstream(const char* __s, ios_base::openmode __mode = ios_base::out);
@@ -1190,6 +1231,9 @@ public:
_LIBCPP_HIDE_FROM_ABI void swap(basic_ofstream& __rhs);
_LIBCPP_HIDE_FROM_ABI basic_filebuf<char_type, traits_type>* rdbuf() const;
+# if _LIBCPP_STD_VER >= 26
+ _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept { return rdbuf()->native_handle(); }
+# endif
_LIBCPP_HIDE_FROM_ABI bool is_open() const;
void open(const char* __s, ios_base::openmode __mode = ios_base::out);
# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
@@ -1321,6 +1365,9 @@ public:
typedef typename traits_type::int_type int_type;
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
+# if _LIBCPP_STD_VER >= 26
+ using native_handle_type = typename basic_filebuf<_CharT, _Traits>::native_handle_type;
+# endif
_LIBCPP_HIDE_FROM_ABI basic_fstream();
_LIBCPP_HIDE_FROM_ABI explicit basic_fstream(const char* __s,
@@ -1345,6 +1392,9 @@ public:
_LIBCPP_HIDE_FROM_ABI void swap(basic_fstream& __rhs);
_LIBCPP_HIDE_FROM_ABI basic_filebuf<char_type, traits_type>* rdbuf() const;
+# if _LIBCPP_STD_VER >= 26
+ _LIBCPP_HIDE_FROM_ABI native_handle_type native_handle() const noexcept { return rdbuf()->native_handle(); }
+# endif
_LIBCPP_HIDE_FROM_ABI bool is_open() const;
_LIBCPP_HIDE_FROM_ABI void open(const char* __s, ios_base::openmode __mode = ios_base::in | ios_base::out);
# ifdef _LIBCPP_HAS_OPEN_WITH_WCHAR
diff --git a/libcxx/include/version b/libcxx/include/version
index d3c2791a7d0b2c..c96647894dce63 100644
--- a/libcxx/include/version
+++ b/libcxx/include/version
@@ -496,7 +496,7 @@ __cpp_lib_within_lifetime 202306L <type_traits>
// # define __cpp_lib_freestanding_optional 202311L
// # define __cpp_lib_freestanding_string_view 202311L
// # define __cpp_lib_freestanding_variant 202311L
-// # define __cpp_lib_fstream_native_handle 202306L
+# define __cpp_lib_fstream_native_handle 202306L
// # define __cpp_lib_function_ref 202306L
// # define __cpp_lib_hazard_pointer 202306L
// # define __cpp_lib_linalg 202311L
diff --git a/libcxx/src/CMakeLists.txt b/libcxx/src/CMakeLists.txt
index 329964a001363b..96e7c6362d8c31 100644
--- a/libcxx/src/CMakeLists.txt
+++ b/libcxx/src/CMakeLists.txt
@@ -84,6 +84,7 @@ endif()
if (LIBCXX_ENABLE_LOCALIZATION)
list(APPEND LIBCXX_SOURCES
+ fstream.cpp
include/sso_allocator.h
ios.cpp
ios.instantiations.cpp
diff --git a/libcxx/src/fstream.cpp b/libcxx/src/fstream.cpp
new file mode 100644
index 00000000000000..55a4442b9c7822
--- /dev/null
+++ b/libcxx/src/fstream.cpp
@@ -0,0 +1,37 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 <__config>
+#include <cstdio>
+#include <fstream>
+
+#if defined(_LIBCPP_WIN32API)
+# define WIN32_LEAN_AND_MEAN
+# define NOMINMAX
+# include <io.h>
+# include <windows.h>
+#endif
+
+_LIBCPP_BEGIN_NAMESPACE_STD
+
+#if defined(_LIBCPP_WIN32API)
+
+// Confirm that `HANDLE` is `void*` as implemented in `basic_filebuf`
+static_assert(std::same_as<HANDLE, void*>);
+
+_LIBCPP_EXPORTED_FROM_ABI void* __filebuf_windows_native_handle(FILE* __file) noexcept {
+ // https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/get-osfhandle?view=msvc-170
+ intptr_t __handle = _get_osfhandle(fileno(__file));
+ if (__handle == -1)
+ return nullptr;
+ return reinterpret_cast<void*>(__handle);
+}
+
+#endif
+
+_LIBCPP_END_NAMESPACE_STD
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/native_handle.assert.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/native_handle.assert.pass.cpp
new file mode 100644
index 00000000000000..9e4d88642d49e6
--- /dev/null
+++ b/libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/native_handle.assert.pass.cpp
@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
+
+// REQUIRES: has-unix-headers
+// REQUIRES: libcpp-hardening-mode={{extensive|debug}}
+// XFAIL: availability-verbose_abort-missing
+
+// <fstream>
+
+// class basic_filebuf;
+
+// native_handle_type native_handle() const noexcept;
+
+#include <fstream>
+
+#include "../native_handle_assert_test_helpers.h"
+
+int main(int, char**) {
+ test_native_handle_assertion<std::basic_filebuf<char>>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+ test_native_handle_assertion<std::basic_filebuf<wchar_t>>();
+#endif
+
+ return 0;
+}
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/native_handle.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/native_handle.pass.cpp
new file mode 100644
index 00000000000000..22cc63e909c5aa
--- /dev/null
+++ b/libcxx/test/std/input.output/file.streams/fstreams/filebuf.members/native_handle.pass.cpp
@@ -0,0 +1,58 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
+
+// <fstream>
+
+// class basic_filebuf;
+
+// native_handle_type native_handle() const noexcept;
+
+#include <cassert>
+#include <fstream>
+#include <filesystem>
+#include <utility>
+
+#include "platform_support.h"
+#include "test_macros.h"
+#include "../native_handle_test_helpers.h"
+
+template <typename CharT>
+void test() {
+ std::basic_filebuf<CharT> f;
+ std::filesystem::path p = get_temp_file_name();
+
+ // non-const
+ {
+ assert(f.open(p, std::ios_base::in) != nullptr);
+ std::same_as<NativeHandleT> decltype(auto) handle = f.native_handle();
+ assert(is_handle_valid(handle));
+ f.close();
+ assert(!is_handle_valid(handle));
+ static_assert(noexcept(f.native_handle()));
+ }
+ // const
+ {
+ assert(f.open(p, std::ios_base::in) != nullptr);
+ std::same_as<NativeHandleT> decltype(auto) const_handle = std::as_const(f).native_handle();
+ assert(is_handle_valid(const_handle));
+ f.close();
+ assert(!is_handle_valid(const_handle));
+ static_assert(noexcept(std::as_const(f).native_handle()));
+ }
+}
+
+int main(int, char**) {
+ test<char>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+ test<wchar_t>();
+#endif
+
+ return 0;
+}
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/filebuf/types.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/filebuf/types.pass.cpp
index ad4249f4d80900..53a5f78d5effb8 100644
--- a/libcxx/test/std/input.output/file.streams/fstreams/filebuf/types.pass.cpp
+++ b/libcxx/test/std/input.output/file.streams/fstreams/filebuf/types.pass.cpp
@@ -23,6 +23,7 @@
#include <type_traits>
#include "test_macros.h"
+#include "../native_handle_test_helpers.h"
int main(int, char**)
{
@@ -32,6 +33,12 @@ int main(int, char**)
static_assert((std::is_same<std::basic_filebuf<char>::int_type, std::char_traits<char>::int_type>::value), "");
static_assert((std::is_same<std::basic_filebuf<char>::pos_type, std::char_traits<char>::pos_type>::value), "");
static_assert((std::is_same<std::basic_filebuf<char>::off_type, std::char_traits<char>::off_type>::value), "");
+#if TEST_STD_VER >= 26
+ test_native_handle_type< std::basic_filebuf<char>>();
+# ifndef TEST_HAS_NO_WIDE_CHARACTERS
+ test_native_handle_type< std::basic_filebuf<wchar_t>>();
+# endif
+#endif
- return 0;
+ return 0;
}
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/fstream.members/native_handle.assert.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/fstream.members/native_handle.assert.pass.cpp
new file mode 100644
index 00000000000000..8fd37f68fc97a6
--- /dev/null
+++ b/libcxx/test/std/input.output/file.streams/fstreams/fstream.members/native_handle.assert.pass.cpp
@@ -0,0 +1,32 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
+
+// REQUIRES: has-unix-headers
+// REQUIRES: libcpp-hardening-mode={{extensive|debug}}
+// XFAIL: availability-verbose_abort-missing
+
+// <fstream>
+
+// class basic_fstream;
+
+// native_handle_type native_handle() const noexcept;
+
+#include <fstream>
+
+#include "../native_handle_assert_test_helpers.h"
+
+int main(int, char**) {
+ test_native_handle_assertion<std::basic_fstream<char>>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+ test_native_handle_assertion<std::basic_fstream<wchar_t>>();
+#endif
+
+ return 0;
+}
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/fstream.members/native_handle.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/fstream.members/native_handle.pass.cpp
new file mode 100644
index 00000000000000..a7229512385ab3
--- /dev/null
+++ b/libcxx/test/std/input.output/file.streams/fstreams/fstream.members/native_handle.pass.cpp
@@ -0,0 +1,27 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14, c++17, c++20, c++23
+
+// <fstream>
+
+// class basic_fstream;
+
+// native_handle_type native_handle() const noexcept;
+
+#include "test_macros.h"
+#include "../native_handle_test_helpers.h"
+
+int main(int, char**) {
+ test_native_handle<char, std::basic_fstream<char>>();
+#ifndef TEST_HAS_NO_WIDE_CHARACTERS
+ test_native_handle<wchar_t, std::basic_fstream<wchar_t>>();
+#endif
+
+ return 0;
+}
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/fstream/types.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/fstream/types.pass.cpp
index 9274b1854bf85b..0e275c53ed1891 100644
--- a/libcxx/test/std/input.output/file.streams/fstreams/fstream/types.pass.cpp
+++ b/libcxx/test/std/input.output/file.streams/fstreams/fstream/types.pass.cpp
@@ -23,6 +23,7 @@
#include <type_traits>
#include "test_macros.h"
+#include "../native_handle_test_helpers.h"
int main(int, char**)
{
@@ -32,6 +33,12 @@ int main(int, char**)
static_assert((std::is_same<std::basic_fstream<char>::int_type, std::char_traits<char>::int_type>::value), "");
static_assert((std::is_same<std::basic_fstream<char>::pos_type, std::char_traits<char>::pos_type>::value), "");
static_assert((std::is_same<std::basic_fstream<char>::off_type, std::char_traits<char>::off_type>::value), "");
+#if TEST_STD_VER >= 26
+ test_native_handle_type< std::basic_fstream<char>>();
+# ifndef TEST_HAS_NO_WIDE_CHARACTERS
+ test_native_handle_type< std::basic_fstream<wchar_t>>();
+# endif
+#endif
- return 0;
+ return 0;
}
diff --git a/libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/native_handle.assert.pass.cpp b/libcxx/test/std/input.output/file.streams/fstreams/ifstream.members/native_handle.assert.pass.cpp
new file mode 100644
index 00000000000000..c17b778c4afad2
--- /dev/null
+++...
[truncated]
``````````
</details>
https://github.com/llvm/llvm-project/pull/77190
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