diff --git a/libc/src/unistd/linux/pathconf_utils.cpp b/libc/src/unistd/linux/pathconf_utils.cpp
@@ -0,0 +1,127 @@
+//===-- Linux implementation of pathconf_utils ----------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+// This header must go before limits_macros.h otherwise libc header may choose
+// to undefine LINK_MAX.
+#include <linux/limits.h> // For LINK_MAX and other limits
+
+#include "hdr/limits_macros.h"
+#include "hdr/unistd_macros.h"
+#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/__support/common.h"
+#include "src/errno/libc_errno.h"
+#include "src/sys/statvfs/linux/statfs_utils.h"
+
+// other linux specific includes
+#include <linux/bfs_fs.h>
+#if __has_include(<linux/ufs_fs.h>)
+#include <linux/ufs_fs.h>
+#else
+// from https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/
+#define UFS_MAGIC 0x00011954
+#endif
+#include <linux/magic.h> // For common FS magics
+
+namespace LIBC_NAMESPACE {
+
+long filesizebits(const statfs_utils::LinuxStatFs &s) {
+  switch (s.f_type) {
+  case JFFS2_SUPER_MAGIC:
+  case MSDOS_SUPER_MAGIC:
+  case NCP_SUPER_MAGIC:
+    return 32;
+  }
+  return 64;
+}
+
+long link_max(const statfs_utils::LinuxStatFs &s) {
+  switch (s.f_type) {
+  case EXT2_SUPER_MAGIC:
+    return 32000;
+  case MINIX_SUPER_MAGIC:
+    return 250;
+  case MINIX2_SUPER_MAGIC:
+    return 65530;
+  case REISERFS_SUPER_MAGIC:
+    return 0xffff - 1000;
+  case UFS_MAGIC:
+    return 32000;
+  }
+  return LINK_MAX;
+}
+
+long symlinks(const statfs_utils::LinuxStatFs &s) {
+  switch (s.f_type) {
+  case ADFS_SUPER_MAGIC:
+  case BFS_MAGIC:
+  case CRAMFS_MAGIC:
+  case EFS_SUPER_MAGIC:
+  case MSDOS_SUPER_MAGIC:
+  case QNX4_SUPER_MAGIC:
+    return 0;
+  }
+  return 1;
+}
+
+long pathconfig(const statfs_utils::LinuxStatFs &s, int name) {
+  switch (name) {
+  case _PC_LINK_MAX:
+    return link_max(s);
+
+  case _PC_FILESIZEBITS:
+    return filesizebits(s);
+
+  case _PC_2_SYMLINKS:
+    return symlinks(s);
+
+  case _PC_REC_MIN_XFER_SIZE:
+    return s.f_bsize;
+
+  case _PC_ALLOC_SIZE_MIN:
+  case _PC_REC_XFER_ALIGN:
+    return s.f_frsize;
+
+  case _PC_MAX_CANON:
+    return _POSIX_MAX_CANON;
+
+  case _PC_MAX_INPUT:
+    return _POSIX_MAX_INPUT;
+
+  case _PC_NAME_MAX:
+    return s.f_namelen;
+
+  case _PC_PATH_MAX:
+    return _POSIX_PATH_MAX;
+
+  case _PC_PIPE_BUF:
+    return _POSIX_PIPE_BUF;
+
+  case _PC_CHOWN_RESTRICTED:
+    return _POSIX_CHOWN_RESTRICTED;
+
+  case _PC_NO_TRUNC:
+    return _POSIX_NO_TRUNC;
+
+  case _PC_VDISABLE:
+    return _POSIX_VDISABLE;
+
+  case _PC_ASYNC_IO:
+  case _PC_PRIO_IO:
+  case _PC_REC_INCR_XFER_SIZE:
+  case _PC_REC_MAX_XFER_SIZE:
+  case _PC_SYMLINK_MAX:
+  case _PC_SYNC_IO:
+    return -1;
+
+  default:
+    libc_errno = EINVAL;
+    return -1;
+  }
+}
+
+} // namespace LIBC_NAMESPACE
diff --git a/libc/src/unistd/linux/pathconf_utils.h b/libc/src/unistd/linux/pathconf_utils.h
@@ -0,0 +1,20 @@
+//===-- Implementation header for pathconf_utils ----------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_UNISTD_PATHCONF_UTILS_H
+#define LLVM_LIBC_SRC_UNISTD_PATHCONF_UTILS_H
+
+#include "src/sys/statvfs/linux/statfs_utils.h"
+
+namespace LIBC_NAMESPACE {
+
+long pathconfig(const statfs_utils::LinuxStatFs &s, int name);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_UNISTD_PREAD_H
diff --git a/libc/src/unistd/pathconf.h b/libc/src/unistd/pathconf.h
@@ -0,0 +1,18 @@
+//===-- Implementation header for pathconf ----------------------*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC_UNISTD_PATHCONF_H
+#define LLVM_LIBC_SRC_UNISTD_PATHCONF_H
+
+namespace LIBC_NAMESPACE {
+
+long pathconf(const char *path, int name);
+
+} // namespace LIBC_NAMESPACE
+
+#endif // LLVM_LIBC_SRC_UNISTD_PREAD_H
diff --git a/libc/test/src/unistd/CMakeLists.txt b/libc/test/src/unistd/CMakeLists.txt
@@ -446,6 +446,36 @@ add_libc_unittest(
     libc.src.unistd.sysconf
 )
 
+add_libc_unittest(
+  fpathconf_test
+  SUITE
+    libc_unistd_unittests
+  SRCS
+    fpathconf_test.cpp
+  DEPENDS
+    libc.hdr.limits_macros
+    libc.hdr.unistd_macros
+    libc.hdr.sys_stat_macros
+    libc.src.unistd.fpathconf
+    libc.src.fcntl.open
+    libc.src.unistd.close
+)
+
+add_libc_unittest(
+  pathconf_test
+  SUITE
+    libc_unistd_unittests
+  SRCS
+    pathconf_test.cpp
+  DEPENDS
+    libc.hdr.limits_macros
+    libc.hdr.unistd_macros
+    libc.hdr.sys_stat_macros
+    libc.src.unistd.pathconf
+    libc.src.fcntl.open
+    libc.src.unistd.close
+)
+
 add_libc_test(
   getopt_test
   HERMETIC_TEST_ONLY # Uses libc's own stderr

diff --git a/libc/test/src/unistd/fpathconf_test.cpp b/libc/test/src/unistd/fpathconf_test.cpp
@@ -0,0 +1,30 @@
+//===-- Unittests for fpathconf -------------------------------------------===//
+//
+// 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/fcntl_macros.h"
+#include "hdr/limits_macros.h"
+#include "hdr/sys_stat_macros.h"
+#include "hdr/unistd_macros.h"
+#include "src/fcntl/open.h"
+#include "src/unistd/close.h"
+#include "src/unistd/fpathconf.h"
+#include "test/UnitTest/ErrnoSetterMatcher.h"
+#include "test/UnitTest/Test.h"
+
+using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
+
+TEST(LlvmLibcPipeTest, 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);
+  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);
+}
+
+// TODO: Functionality tests
diff --git a/libc/test/src/unistd/pathconf_test.cpp b/libc/test/src/unistd/pathconf_test.cpp
@@ -0,0 +1,30 @@
+//===-- Unittests for pathconf --------------------------------------------===//
+//
+// 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/fcntl_macros.h"
+#include "hdr/limits_macros.h"
+#include "hdr/sys_stat_macros.h"
+#include "hdr/unistd_macros.h"
+#include "src/fcntl/open.h"
+#include "src/unistd/close.h"
+#include "src/unistd/pathconf.h"
+#include "test/UnitTest/ErrnoSetterMatcher.h"
+#include "test/UnitTest/Test.h"
+
+using namespace LIBC_NAMESPACE::testing::ErrnoSetterMatcher;
+
+TEST(LlvmLibcPipeTest, SmokeTest) {
+  constexpr const char *FILENAME = "pathconf.test";
+  auto TEST_FILE = libc_make_test_file_path(FILENAME);
+  int fd = LIBC_NAMESPACE::open(TEST_FILE, O_WRONLY | O_CREAT, S_IRWXU);
+  EXPECT_EQ(LIBC_NAMESPACE::pathconf(FILENAME, _PC_SYNC_IO), -1l);
+  EXPECT_EQ(LIBC_NAMESPACE::pathconf(FILENAME, _PC_PATH_MAX),
+            static_cast<long>(_POSIX_PATH_MAX));
+  LIBC_NAMESPACE::close(fd);
+}
+
+// TODO: Functionality tests