[libc-commits] [libc] fd7993e - [libc] Add <sys/statfs.h> header and entrypoints. (#213108)
via libc-commits
libc-commits at lists.llvm.org
Fri Jul 31 07:29:33 PDT 2026
Author: Alexey Samsonov
Date: 2026-07-31T14:29:27Z
New Revision: fd7993ea2dcc76f915da1baf1b36f5cd560722a8
URL: https://github.com/llvm/llvm-project/commit/fd7993ea2dcc76f915da1baf1b36f5cd560722a8
DIFF: https://github.com/llvm/llvm-project/commit/fd7993ea2dcc76f915da1baf1b36f5cd560722a8.diff
LOG: [libc] Add <sys/statfs.h> header and entrypoints. (#213108)
Implement `statfs` and `fstatfs` functions on Linux.
We already have `struct statfs` and syscall wrappers defined (to
implement POSIX `<sys/statvfs.h>`). Use them to provide Linux-specific
functions as well.
Added:
libc/include/llvm-libc-macros/linux/sys-statfs-macros.h
libc/include/llvm-libc-macros/sys-statfs-macros.h
libc/include/sys/statfs.yaml
libc/src/sys/statfs/CMakeLists.txt
libc/src/sys/statfs/fstatfs.h
libc/src/sys/statfs/linux/CMakeLists.txt
libc/src/sys/statfs/linux/fstatfs.cpp
libc/src/sys/statfs/linux/statfs.cpp
libc/src/sys/statfs/statfs.h
libc/test/src/sys/statfs/CMakeLists.txt
libc/test/src/sys/statfs/linux/CMakeLists.txt
libc/test/src/sys/statfs/linux/fstatfs_test.cpp
libc/test/src/sys/statfs/linux/statfs_test.cpp
Modified:
libc/config/linux/aarch64/entrypoints.txt
libc/config/linux/aarch64/headers.txt
libc/config/linux/riscv/entrypoints.txt
libc/config/linux/riscv/headers.txt
libc/config/linux/x86_64/entrypoints.txt
libc/config/linux/x86_64/headers.txt
libc/include/CMakeLists.txt
libc/include/llvm-libc-macros/CMakeLists.txt
libc/include/llvm-libc-macros/linux/CMakeLists.txt
libc/src/sys/CMakeLists.txt
libc/test/src/sys/CMakeLists.txt
Removed:
################################################################################
diff --git a/libc/config/linux/aarch64/entrypoints.txt b/libc/config/linux/aarch64/entrypoints.txt
index 2cfbc1e2b69fc..1ccb6cf202cf7 100644
--- a/libc/config/linux/aarch64/entrypoints.txt
+++ b/libc/config/linux/aarch64/entrypoints.txt
@@ -334,7 +334,11 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.sys.stat.stat
libc.src.sys.stat.utimensat
- # sys/statvfs.h
+ # sys/statfs.h entrypoints
+ libc.src.sys.statfs.fstatfs
+ libc.src.sys.statfs.statfs
+
+ # sys/statvfs.h entrypoints
libc.src.sys.statvfs.fstatvfs
libc.src.sys.statvfs.statvfs
diff --git a/libc/config/linux/aarch64/headers.txt b/libc/config/linux/aarch64/headers.txt
index 37d7ab9530c3b..5f8b9c2aeaf5b 100644
--- a/libc/config/linux/aarch64/headers.txt
+++ b/libc/config/linux/aarch64/headers.txt
@@ -62,6 +62,7 @@ set(TARGET_PUBLIC_HEADERS
libc.include.sys_signal
libc.include.sys_socket
libc.include.sys_stat
+ libc.include.sys_statfs
libc.include.sys_statvfs
libc.include.sys_syscall
libc.include.sys_time
diff --git a/libc/config/linux/riscv/entrypoints.txt b/libc/config/linux/riscv/entrypoints.txt
index 256e3a7dc3a87..5083417b453be 100644
--- a/libc/config/linux/riscv/entrypoints.txt
+++ b/libc/config/linux/riscv/entrypoints.txt
@@ -365,7 +365,11 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.sys.stat.stat
libc.src.sys.stat.utimensat
- # sys/statvfs.h
+ # sys/statfs.h entrypoints
+ libc.src.sys.statfs.fstatfs
+ libc.src.sys.statfs.statfs
+
+ # sys/statvfs.h entrypoints
libc.src.sys.statvfs.fstatvfs
libc.src.sys.statvfs.statvfs
diff --git a/libc/config/linux/riscv/headers.txt b/libc/config/linux/riscv/headers.txt
index 7fb172f86b1db..0b1d7dc7dff34 100644
--- a/libc/config/linux/riscv/headers.txt
+++ b/libc/config/linux/riscv/headers.txt
@@ -63,6 +63,7 @@ set(TARGET_PUBLIC_HEADERS
libc.include.sys_signal
libc.include.sys_socket
libc.include.sys_stat
+ libc.include.sys_statfs
libc.include.sys_statvfs
libc.include.sys_syscall
libc.include.sys_time
diff --git a/libc/config/linux/x86_64/entrypoints.txt b/libc/config/linux/x86_64/entrypoints.txt
index 619fc9b85ae48..bf809e268f585 100644
--- a/libc/config/linux/x86_64/entrypoints.txt
+++ b/libc/config/linux/x86_64/entrypoints.txt
@@ -370,7 +370,11 @@ set(TARGET_LIBC_ENTRYPOINTS
libc.src.sys.stat.stat
libc.src.sys.stat.utimensat
- # sys/statvfs.h
+ # sys/statfs.h entrypoints
+ libc.src.sys.statfs.fstatfs
+ libc.src.sys.statfs.statfs
+
+ # sys/statvfs.h entrypoints
libc.src.sys.statvfs.fstatvfs
libc.src.sys.statvfs.statvfs
diff --git a/libc/config/linux/x86_64/headers.txt b/libc/config/linux/x86_64/headers.txt
index 5fd4039eda139..b8751f7810b30 100644
--- a/libc/config/linux/x86_64/headers.txt
+++ b/libc/config/linux/x86_64/headers.txt
@@ -65,6 +65,7 @@ set(TARGET_PUBLIC_HEADERS
libc.include.sys_signal
libc.include.sys_socket
libc.include.sys_stat
+ libc.include.sys_statfs
libc.include.sys_statvfs
libc.include.sys_syscall
libc.include.sys_time
diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
index 1c6c65fa29c23..cf8bfb02c3931 100644
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -861,6 +861,16 @@ add_header_macro(
.llvm-libc-types.struct_ucred
)
+add_header_macro(
+ sys_statfs
+ ../libc/include/sys/statfs.yaml
+ sys/statfs.h
+ DEPENDS
+ .llvm_libc_common_h
+ .llvm-libc-macros.sys_statfs_macros
+ .llvm-libc-types.struct_statfs
+)
+
add_header_macro(
sys_statvfs
../libc/include/sys/statvfs.yaml
diff --git a/libc/include/llvm-libc-macros/CMakeLists.txt b/libc/include/llvm-libc-macros/CMakeLists.txt
index f0f9dabb00433..45a1dbc851d2c 100644
--- a/libc/include/llvm-libc-macros/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/CMakeLists.txt
@@ -267,6 +267,12 @@ add_macro_header(
sys-stat-macros.h
)
+add_macro_header(
+ sys_statfs_macros
+ HDR
+ sys-statfs-macros.h
+)
+
add_macro_header(
sys_mman_macros
HDR
diff --git a/libc/include/llvm-libc-macros/linux/CMakeLists.txt b/libc/include/llvm-libc-macros/linux/CMakeLists.txt
index 2a400b1c80e2c..c07c6dee8c797 100644
--- a/libc/include/llvm-libc-macros/linux/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/linux/CMakeLists.txt
@@ -100,6 +100,12 @@ add_header(
sys-stat-macros.h
)
+add_header(
+ sys_statfs_macros
+ HDR
+ sys-statfs-macros.h
+)
+
add_header(
sys_time_macros
HDR
diff --git a/libc/include/llvm-libc-macros/linux/sys-statfs-macros.h b/libc/include/llvm-libc-macros/linux/sys-statfs-macros.h
new file mode 100644
index 0000000000000..1e3dbc2cc453a
--- /dev/null
+++ b/libc/include/llvm-libc-macros/linux/sys-statfs-macros.h
@@ -0,0 +1,21 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// Linux specific declarations of macros from sys/statfs.h.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_LINUX_SYS_STATFS_MACROS_H
+#define LLVM_LIBC_MACROS_LINUX_SYS_STATFS_MACROS_H
+
+// There are numerous possible values for f_type field, defined in
+// the Linux kernel header. Include it directly.
+#include <linux/magic.h>
+
+#endif // LLVM_LIBC_MACROS_LINUX_SYS_STATFS_MACROS_H
diff --git a/libc/include/llvm-libc-macros/sys-statfs-macros.h b/libc/include/llvm-libc-macros/sys-statfs-macros.h
new file mode 100644
index 0000000000000..36dcec917ae8e
--- /dev/null
+++ b/libc/include/llvm-libc-macros/sys-statfs-macros.h
@@ -0,0 +1,21 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// Macros defined in sys/statfs.h header file.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_SYS_STATFS_MACROS_H
+#define LLVM_LIBC_MACROS_SYS_STATFS_MACROS_H
+
+#ifdef __linux__
+#include "linux/sys-statfs-macros.h"
+#endif
+
+#endif // LLVM_LIBC_MACROS_SYS_STATFS_MACROS_H
diff --git a/libc/include/sys/statfs.yaml b/libc/include/sys/statfs.yaml
new file mode 100644
index 0000000000000..337a3e33357f1
--- /dev/null
+++ b/libc/include/sys/statfs.yaml
@@ -0,0 +1,19 @@
+header: sys/statfs.h
+standards:
+ - linux
+macros:
+ - macro_name: ADFS_SUPER_MAGIC
+ macro_header: sys-statfs-macros.h
+types:
+ - type_name: struct_statfs
+functions:
+ - name: fstatfs
+ return_type: int
+ arguments:
+ - type: int
+ - type: struct statfs *
+ - name: statfs
+ return_type: int
+ arguments:
+ - type: const char *
+ - type: struct statfs *
diff --git a/libc/src/sys/CMakeLists.txt b/libc/src/sys/CMakeLists.txt
index 69e96c0e1705b..95334f0084f07 100644
--- a/libc/src/sys/CMakeLists.txt
+++ b/libc/src/sys/CMakeLists.txt
@@ -10,6 +10,7 @@ add_subdirectory(socket)
add_subdirectory(sem)
add_subdirectory(sendfile)
add_subdirectory(stat)
+add_subdirectory(statfs)
add_subdirectory(statvfs)
add_subdirectory(time)
add_subdirectory(utsname)
diff --git a/libc/src/sys/statfs/CMakeLists.txt b/libc/src/sys/statfs/CMakeLists.txt
new file mode 100644
index 0000000000000..7db6450b2aa31
--- /dev/null
+++ b/libc/src/sys/statfs/CMakeLists.txt
@@ -0,0 +1,17 @@
+if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
+ add_subdirectory(${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
+endif()
+
+add_entrypoint_object(
+ statfs
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.statfs
+)
+
+add_entrypoint_object(
+ fstatfs
+ ALIAS
+ DEPENDS
+ .${LIBC_TARGET_OS}.fstatfs
+)
diff --git a/libc/src/sys/statfs/fstatfs.h b/libc/src/sys/statfs/fstatfs.h
new file mode 100644
index 0000000000000..8cfc945250e7d
--- /dev/null
+++ b/libc/src/sys/statfs/fstatfs.h
@@ -0,0 +1,26 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// Implementation header for fstatfs.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_SYS_STATFS_FSTATFS_H
+#define LLVM_LIBC_SRC_SYS_STATFS_FSTATFS_H
+
+#include "hdr/types/struct_statfs.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+int fstatfs(int fd, struct statfs *buf);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_SYS_STATFS_FSTATFS_H
diff --git a/libc/src/sys/statfs/linux/CMakeLists.txt b/libc/src/sys/statfs/linux/CMakeLists.txt
new file mode 100644
index 0000000000000..34cec1e37c0d2
--- /dev/null
+++ b/libc/src/sys/statfs/linux/CMakeLists.txt
@@ -0,0 +1,23 @@
+add_entrypoint_object(
+ statfs
+ SRCS
+ statfs.cpp
+ HDRS
+ ../statfs.h
+ DEPENDS
+ libc.src.errno.errno
+ libc.src.__support.OSUtil.linux.syscall_wrappers.statfs
+ libc.hdr.types.struct_statfs
+)
+
+add_entrypoint_object(
+ fstatfs
+ SRCS
+ fstatfs.cpp
+ HDRS
+ ../fstatfs.h
+ DEPENDS
+ libc.src.errno.errno
+ libc.src.__support.OSUtil.linux.syscall_wrappers.fstatfs
+ libc.hdr.types.struct_statfs
+)
diff --git a/libc/src/sys/statfs/linux/fstatfs.cpp b/libc/src/sys/statfs/linux/fstatfs.cpp
new file mode 100644
index 0000000000000..ddfc482fd3014
--- /dev/null
+++ b/libc/src/sys/statfs/linux/fstatfs.cpp
@@ -0,0 +1,31 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// Linux implementation of fstatfs.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/sys/statfs/fstatfs.h"
+#include "src/__support/OSUtil/linux/syscall_wrappers/fstatfs.h"
+#include "src/__support/common.h"
+#include "src/__support/libc_errno.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, fstatfs, (int fd, struct statfs *buf)) {
+ auto error_or_ret = linux_syscalls::fstatfs(fd, buf);
+ if (!error_or_ret) {
+ libc_errno = error_or_ret.error();
+ return -1;
+ }
+ return 0;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/sys/statfs/linux/statfs.cpp b/libc/src/sys/statfs/linux/statfs.cpp
new file mode 100644
index 0000000000000..376bb42cfbf47
--- /dev/null
+++ b/libc/src/sys/statfs/linux/statfs.cpp
@@ -0,0 +1,31 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// Linux implementation of statfs.
+///
+//===----------------------------------------------------------------------===//
+
+#include "src/sys/statfs/statfs.h"
+#include "src/__support/OSUtil/linux/syscall_wrappers/statfs.h"
+#include "src/__support/common.h"
+#include "src/__support/libc_errno.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, statfs, (const char *path, struct statfs *buf)) {
+ auto error_or_ret = linux_syscalls::statfs(path, buf);
+ if (!error_or_ret) {
+ libc_errno = error_or_ret.error();
+ return -1;
+ }
+ return 0;
+}
+
+} // namespace LIBC_NAMESPACE_DECL
diff --git a/libc/src/sys/statfs/statfs.h b/libc/src/sys/statfs/statfs.h
new file mode 100644
index 0000000000000..59fd969010ca1
--- /dev/null
+++ b/libc/src/sys/statfs/statfs.h
@@ -0,0 +1,26 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// Implementation header for statfs.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_SYS_STATFS_STATFS_H
+#define LLVM_LIBC_SRC_SYS_STATFS_STATFS_H
+
+#include "hdr/types/struct_statfs.h"
+#include "src/__support/macros/config.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+int statfs(const char *path, struct statfs *buf);
+
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC_SYS_STATFS_STATFS_H
diff --git a/libc/test/src/sys/CMakeLists.txt b/libc/test/src/sys/CMakeLists.txt
index 9af889bffa46d..85f702edcb14e 100644
--- a/libc/test/src/sys/CMakeLists.txt
+++ b/libc/test/src/sys/CMakeLists.txt
@@ -6,6 +6,7 @@ add_subdirectory(select)
add_subdirectory(sendfile)
add_subdirectory(socket)
add_subdirectory(stat)
+add_subdirectory(statfs)
add_subdirectory(statvfs)
add_subdirectory(utsname)
add_subdirectory(wait)
diff --git a/libc/test/src/sys/statfs/CMakeLists.txt b/libc/test/src/sys/statfs/CMakeLists.txt
new file mode 100644
index 0000000000000..b4bbe81c92ff2
--- /dev/null
+++ b/libc/test/src/sys/statfs/CMakeLists.txt
@@ -0,0 +1,3 @@
+if(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${LIBC_TARGET_OS})
+ add_subdirectory(${LIBC_TARGET_OS})
+endif()
diff --git a/libc/test/src/sys/statfs/linux/CMakeLists.txt b/libc/test/src/sys/statfs/linux/CMakeLists.txt
new file mode 100644
index 0000000000000..6ba3f35148bdb
--- /dev/null
+++ b/libc/test/src/sys/statfs/linux/CMakeLists.txt
@@ -0,0 +1,35 @@
+add_custom_target(libc_sys_statfs_unittests)
+
+add_libc_unittest(
+ statfs_test
+ SUITE
+ libc_sys_statfs_unittests
+ SRCS
+ statfs_test.cpp
+ DEPENDS
+ libc.hdr.sys_stat_macros
+ libc.src.errno.errno
+ libc.src.sys.statfs.statfs
+ libc.src.sys.stat.mkdirat
+ libc.src.unistd.rmdir
+ libc.test.UnitTest.ErrnoCheckingTest
+ libc.test.UnitTest.ErrnoSetterMatcher
+)
+
+add_libc_unittest(
+ fstatfs_test
+ SUITE
+ libc_sys_statfs_unittests
+ SRCS
+ fstatfs_test.cpp
+ DEPENDS
+ libc.hdr.sys_stat_macros
+ libc.src.errno.errno
+ libc.src.sys.statfs.fstatfs
+ libc.src.sys.stat.mkdirat
+ libc.src.unistd.rmdir
+ libc.src.fcntl.open
+ libc.src.unistd.close
+ libc.test.UnitTest.ErrnoCheckingTest
+ libc.test.UnitTest.ErrnoSetterMatcher
+)
diff --git a/libc/test/src/sys/statfs/linux/fstatfs_test.cpp b/libc/test/src/sys/statfs/linux/fstatfs_test.cpp
new file mode 100644
index 0000000000000..a89e506f1cf62
--- /dev/null
+++ b/libc/test/src/sys/statfs/linux/fstatfs_test.cpp
@@ -0,0 +1,65 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 fstatfs.
+///
+//===----------------------------------------------------------------------===//
+
+#include "hdr/fcntl_macros.h"
+#include "hdr/sys_stat_macros.h"
+#include "src/__support/libc_errno.h"
+#include "src/__support/macros/config.h"
+#include "src/fcntl/open.h"
+#include "src/sys/stat/mkdirat.h"
+#include "src/sys/statfs/fstatfs.h"
+#include "src/unistd/close.h"
+#include "src/unistd/rmdir.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
+#include "test/UnitTest/ErrnoSetterMatcher.h"
+#include "test/UnitTest/Test.h"
+
+using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
+using LlvmLibcSysFStatfsTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
+
+TEST_F(LlvmLibcSysFStatfsTest, FStatfsBasic) {
+ struct statfs buf;
+
+ int fd = LIBC_NAMESPACE::open("/", O_PATH);
+ ASSERT_ERRNO_SUCCESS();
+ ASSERT_GT(fd, 0);
+
+ // The root of the file directory must always exist
+ ASSERT_THAT(LIBC_NAMESPACE::fstatfs(fd, &buf), Succeeds());
+ ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
+}
+
+TEST_F(LlvmLibcSysFStatfsTest, FStatfsInvalidPath) {
+ struct statfs buf;
+
+ constexpr const char *FILENAME = "fstatfs.testdir";
+ auto TEST_DIR = libc_make_test_file_path(FILENAME);
+
+ // Always delete the folder so that we start in a consistent state.
+ LIBC_NAMESPACE::rmdir(TEST_DIR);
+ libc_errno = 0; // Reset errno
+
+ ASSERT_THAT(LIBC_NAMESPACE::mkdirat(AT_FDCWD, TEST_DIR, S_IRWXU),
+ Succeeds(0));
+
+ int fd = LIBC_NAMESPACE::open(TEST_DIR, O_PATH);
+ ASSERT_ERRNO_SUCCESS();
+ ASSERT_GT(fd, 0);
+
+ ASSERT_THAT(LIBC_NAMESPACE::fstatfs(fd, &buf), Succeeds());
+ ASSERT_THAT(LIBC_NAMESPACE::close(fd), Succeeds(0));
+
+ ASSERT_THAT(LIBC_NAMESPACE::rmdir(TEST_DIR), Succeeds(0));
+
+ ASSERT_THAT(LIBC_NAMESPACE::fstatfs(fd, &buf), Fails(EBADF));
+}
diff --git a/libc/test/src/sys/statfs/linux/statfs_test.cpp b/libc/test/src/sys/statfs/linux/statfs_test.cpp
new file mode 100644
index 0000000000000..6868cd50c99bb
--- /dev/null
+++ b/libc/test/src/sys/statfs/linux/statfs_test.cpp
@@ -0,0 +1,56 @@
+//===----------------------------------------------------------------------===//
+//
+// 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 statfs.
+///
+//===----------------------------------------------------------------------===//
+
+#include "hdr/fcntl_macros.h"
+#include "hdr/sys_stat_macros.h"
+#include "src/__support/libc_errno.h"
+#include "src/__support/macros/config.h"
+#include "src/sys/stat/mkdirat.h"
+#include "src/sys/statfs/statfs.h"
+#include "src/unistd/rmdir.h"
+#include "test/UnitTest/ErrnoCheckingTest.h"
+#include "test/UnitTest/ErrnoSetterMatcher.h"
+#include "test/UnitTest/Test.h"
+
+using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
+using LlvmLibcSysStatfsTest = LIBC_NAMESPACE::testing::ErrnoCheckingTest;
+
+TEST_F(LlvmLibcSysStatfsTest, StatfsBasic) {
+ struct statfs buf;
+ // The root of the file directory must always exist
+ ASSERT_THAT(LIBC_NAMESPACE::statfs("/", &buf), Succeeds());
+}
+
+TEST_F(LlvmLibcSysStatfsTest, StatfsInvalidPath) {
+ struct statfs buf;
+
+ ASSERT_THAT(LIBC_NAMESPACE::statfs("", &buf), Fails(ENOENT));
+
+ // create the file, assert it exists, then delete it and assert it doesn't
+ // exist anymore.
+ constexpr const char *FILENAME = "statfs.testdir";
+ auto TEST_DIR = libc_make_test_file_path(FILENAME);
+
+ // Always delete the folder so that we start in a consistent state.
+ LIBC_NAMESPACE::rmdir(TEST_DIR);
+ libc_errno = 0; // Reset errno
+
+ ASSERT_THAT(LIBC_NAMESPACE::mkdirat(AT_FDCWD, TEST_DIR, S_IRWXU),
+ Succeeds(0));
+
+ ASSERT_THAT(LIBC_NAMESPACE::statfs(TEST_DIR, &buf), Succeeds());
+
+ ASSERT_THAT(LIBC_NAMESPACE::rmdir(TEST_DIR), Succeeds(0));
+
+ ASSERT_THAT(LIBC_NAMESPACE::statfs(TEST_DIR, &buf), Fails(ENOENT));
+}
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