[libc-commits] [libc] [libc] Add unistd overlay (PR #119312)

Tristan Ross via libc-commits libc-commits at lists.llvm.org
Mon Dec 9 19:23:21 PST 2024 

https://github.com/RossComputerGuy updated https://github.com/llvm/llvm-project/pull/119312

>From acd25c672693140d62cbf04cfed608cecd5e9184 Mon Sep 17 00:00:00 2001
From: Tristan Ross <tristan.ross at midstall.com>
Date: Mon, 9 Dec 2024 18:36:14 -0800
Subject: [PATCH] [libc] Add unistd overlay

---
 libc/hdr/CMakeLists.txt             |  3 ++
 libc/hdr/unistd_macros.h            |  2 +-
 libc/hdr/unistd_overlay.h           | 69 +++++++++++++++++++++++++++++
 libc/src/unistd/dup.h               |  2 +-
 libc/src/unistd/dup2.h              |  2 +-
 libc/src/unistd/dup3.h              |  2 +-
 libc/src/unistd/fork.h              |  3 +-
 libc/src/unistd/ftruncate.h         |  3 +-
 libc/src/unistd/getcwd.h            |  3 +-
 libc/src/unistd/geteuid.h           |  3 +-
 libc/src/unistd/getopt.h            |  2 +-
 libc/src/unistd/getpid.h            |  3 +-
 libc/src/unistd/getppid.h           |  3 +-
 libc/src/unistd/getuid.h            |  3 +-
 libc/src/unistd/isatty.h            |  2 +-
 libc/src/unistd/link.h              |  2 +-
 libc/src/unistd/linux/ftruncate.cpp |  2 +-
 libc/src/unistd/linux/lseek.cpp     |  2 +-
 libc/src/unistd/linux/sysconf.cpp   |  2 +-
 libc/src/unistd/linux/truncate.cpp  |  2 +-
 libc/src/unistd/lseek.h             |  3 +-
 libc/src/unistd/pread.h             |  5 ++-
 libc/src/unistd/pwrite.h            |  5 ++-
 libc/src/unistd/read.h              |  3 +-
 libc/src/unistd/readlink.h          |  4 +-
 libc/src/unistd/readlinkat.h        |  2 +-
 libc/src/unistd/swab.h              |  2 +-
 libc/src/unistd/symlink.h           |  2 +-
 libc/src/unistd/symlinkat.h         |  2 +-
 libc/src/unistd/syscall.h           |  2 +-
 libc/src/unistd/sysconf.h           |  2 +-
 libc/src/unistd/truncate.h          |  2 +-
 libc/src/unistd/write.h             |  3 +-
 33 files changed, 121 insertions(+), 31 deletions(-)
 create mode 100644 libc/hdr/unistd_overlay.h

diff --git a/libc/hdr/CMakeLists.txt b/libc/hdr/CMakeLists.txt
index 5eb311f4bb2298..7f523c50e86943 100644
--- a/libc/hdr/CMakeLists.txt
+++ b/libc/hdr/CMakeLists.txt
@@ -126,10 +126,13 @@ add_proxy_header_library(
     libc.include.llvm-libc-macros.sys_stat_macros
 )
 
+add_header_library(unistd_overlay HDRS unistd_overlay.h)
 add_proxy_header_library(
   unistd_macros
   HDRS
     unistd_macros.h
+  DEPENDS
+    .unistd_overlay
   FULL_BUILD_DEPENDS
     libc.include.unistd
     libc.include.llvm-libc-macros.unistd_macros
diff --git a/libc/hdr/unistd_macros.h b/libc/hdr/unistd_macros.h
index 132e123280139f..5c2b24354dd3ee 100644
--- a/libc/hdr/unistd_macros.h
+++ b/libc/hdr/unistd_macros.h
@@ -15,7 +15,7 @@
 
 #else // Overlay mode
 
-#include <unistd.h>
+#include "unistd_overlay.h"
 
 #endif // LLVM_LIBC_FULL_BUILD
 
diff --git a/libc/hdr/unistd_overlay.h b/libc/hdr/unistd_overlay.h
new file mode 100644
index 00000000000000..e3001e0cda08f5
--- /dev/null
+++ b/libc/hdr/unistd_overlay.h
@@ -0,0 +1,69 @@
+//===-- Including unistd.h in overlay mode -------------------------------===//
+//
+// 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_HDR_UNISTD_OVERLAY_H
+#define LLVM_LIBC_HDR_UNISTD_OVERLAY_H
+
+#ifdef LIBC_FULL_BUILD
+#error "This header should only be included in overlay mode"
+#endif
+
+// Overlay mode
+
+// glibc <unistd.h> header might provide extern inline definitions for few
+// functions, causing external alias errors.  They are guarded by
+// `__USE_EXTERN_INLINES` macro.  We temporarily disable `__USE_EXTERN_INLINES`
+// macro by defining `__NO_INLINE__` before including <stdio.h>.
+// And the same with `__USE_FORTIFY_LEVEL`, which will be temporarily disabled
+// with `_FORTIFY_SOURCE`.
+
+#ifdef _FORTIFY_SOURCE
+#define LIBC_OLD_FORTIFY_SOURCE _FORTIFY_SOURCE
+#undef _FORTIFY_SOURCE
+#endif
+
+#ifdef __USE_EXTERN_INLINES
+#define LIBC_OLD_USE_EXTERN_INLINES
+#undef __USE_EXTERN_INLINES
+#endif
+
+#ifdef __USE_FORTIFY_LEVEL
+#define LIBC_OLD_USE_FORTIFY_LEVEL __USE_FORTIFY_LEVEL
+#undef __USE_FORTIFY_LEVEL
+#define __USE_FORTIFY_LEVEL 0
+#endif
+
+#ifndef __NO_INLINE__
+#define __NO_INLINE__ 1
+#define LIBC_SET_NO_INLINE
+#endif
+
+#include <unistd.h>
+
+#ifdef LIBC_OLD_FORTIFY_SOURCE
+#define _FORTIFY_SOURCE LIBC_OLD_FORTIFY_SOURCE
+#undef LIBC_OLD_FORTIFY_SOURCE
+#endif
+
+#ifdef LIBC_SET_NO_INLINE
+#undef __NO_INLINE__
+#undef LIBC_SET_NO_INLINE
+#endif
+
+#ifdef LIBC_OLD_USE_FORTIFY_LEVEL
+#undef __USE_FORTIFY_LEVEL
+#define __USE_FORTIFY_LEVEL LIBC_OLD_USE_FORTIFY_LEVEL
+#undef LIBC_OLD_USE_FORTIFY_LEVEL
+#endif
+
+#ifdef LIBC_OLD_USE_EXTERN_INLINES
+#define __USE_EXTERN_INLINES
+#undef LIBC_OLD_USE_EXTERN_INLINES
+#endif
+
+#endif // LLVM_LIBC_HDR_UNISTD_OVERLAY_H
diff --git a/libc/src/unistd/dup.h b/libc/src/unistd/dup.h
index 63f093c0ee4365..57601455acc61c 100644
--- a/libc/src/unistd/dup.h
+++ b/libc/src/unistd/dup.h
@@ -9,8 +9,8 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_DUP_H
 #define LLVM_LIBC_SRC_UNISTD_DUP_H
 
+#include "hdr/unistd_macros.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/dup2.h b/libc/src/unistd/dup2.h
index 060c112daf08fb..e2cf62389bca87 100644
--- a/libc/src/unistd/dup2.h
+++ b/libc/src/unistd/dup2.h
@@ -9,8 +9,8 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_DUP2_H
 #define LLVM_LIBC_SRC_UNISTD_DUP2_H
 
+#include "hdr/unistd_macros.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/dup3.h b/libc/src/unistd/dup3.h
index f3868867123b43..06d9b23dbd200f 100644
--- a/libc/src/unistd/dup3.h
+++ b/libc/src/unistd/dup3.h
@@ -9,8 +9,8 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_DUP3_H
 #define LLVM_LIBC_SRC_UNISTD_DUP3_H
 
+#include "hdr/unistd_macros.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/fork.h b/libc/src/unistd/fork.h
index b6fd5763b3a5f6..a4e4e8eadb4178 100644
--- a/libc/src/unistd/fork.h
+++ b/libc/src/unistd/fork.h
@@ -9,8 +9,9 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_FORK_H
 #define LLVM_LIBC_SRC_UNISTD_FORK_H
 
+#include "hdr/unistd_macros.h"
+#include "include/llvm-libc-types/pid_t.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/ftruncate.h b/libc/src/unistd/ftruncate.h
index cd8d363727c4ad..e22df0efee50ec 100644
--- a/libc/src/unistd/ftruncate.h
+++ b/libc/src/unistd/ftruncate.h
@@ -9,8 +9,9 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_FTRUNCATE_H
 #define LLVM_LIBC_SRC_UNISTD_FTRUNCATE_H
 
+#include "hdr/unistd_macros.h"
+#include "include/llvm-libc-types/off_t.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/getcwd.h b/libc/src/unistd/getcwd.h
index 8b63a91c26b5c7..5d79fe5c36bba5 100644
--- a/libc/src/unistd/getcwd.h
+++ b/libc/src/unistd/getcwd.h
@@ -9,8 +9,9 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_GETCWD_H
 #define LLVM_LIBC_SRC_UNISTD_GETCWD_H
 
+#include "hdr/unistd_macros.h"
+#include "include/llvm-libc-types/size_t.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/geteuid.h b/libc/src/unistd/geteuid.h
index 9469797bd3d4ef..a6f32c6a772d05 100644
--- a/libc/src/unistd/geteuid.h
+++ b/libc/src/unistd/geteuid.h
@@ -9,8 +9,9 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_GETEUID_H
 #define LLVM_LIBC_SRC_UNISTD_GETEUID_H
 
+#include "hdr/unistd_macros.h"
+#include "include/llvm-libc-types/uid_t.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/getopt.h b/libc/src/unistd/getopt.h
index 1be3331dcd98a4..0be639d8711961 100644
--- a/libc/src/unistd/getopt.h
+++ b/libc/src/unistd/getopt.h
@@ -10,8 +10,8 @@
 #define LLVM_LIBC_SRC_UNISTD_GETOPT_H
 
 #include "hdr/types/FILE.h"
+#include "hdr/unistd_macros.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/getpid.h b/libc/src/unistd/getpid.h
index c3c55b0c06b108..d99a31a6ad0685 100644
--- a/libc/src/unistd/getpid.h
+++ b/libc/src/unistd/getpid.h
@@ -9,8 +9,9 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_GETPID_H
 #define LLVM_LIBC_SRC_UNISTD_GETPID_H
 
+#include "hdr/unistd_macros.h"
+#include "include/llvm-libc-types/pid_t.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/getppid.h b/libc/src/unistd/getppid.h
index d820791bc06fad..55804503b0500c 100644
--- a/libc/src/unistd/getppid.h
+++ b/libc/src/unistd/getppid.h
@@ -9,8 +9,9 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_GETPPID_H
 #define LLVM_LIBC_SRC_UNISTD_GETPPID_H
 
+#include "hdr/unistd_macros.h"
+#include "include/llvm-libc-types/pid_t.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/getuid.h b/libc/src/unistd/getuid.h
index dd82c7119d4017..93dc80494c05a7 100644
--- a/libc/src/unistd/getuid.h
+++ b/libc/src/unistd/getuid.h
@@ -9,8 +9,9 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_GETUID_H
 #define LLVM_LIBC_SRC_UNISTD_GETUID_H
 
+#include "hdr/unistd_macros.h"
+#include "include/llvm-libc-types/uid_t.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/isatty.h b/libc/src/unistd/isatty.h
index 6dd1b7b817171a..5c8be6541c99cb 100644
--- a/libc/src/unistd/isatty.h
+++ b/libc/src/unistd/isatty.h
@@ -9,8 +9,8 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_ISATTY_H
 #define LLVM_LIBC_SRC_UNISTD_ISATTY_H
 
+#include "hdr/unistd_macros.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/link.h b/libc/src/unistd/link.h
index 9b27aa1accf4ea..c1c26c5e0d4948 100644
--- a/libc/src/unistd/link.h
+++ b/libc/src/unistd/link.h
@@ -9,8 +9,8 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_LINK_H
 #define LLVM_LIBC_SRC_UNISTD_LINK_H
 
+#include "hdr/unistd_macros.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/linux/ftruncate.cpp b/libc/src/unistd/linux/ftruncate.cpp
index 39cb3b5778faaf..ccbb0634664aad 100644
--- a/libc/src/unistd/linux/ftruncate.cpp
+++ b/libc/src/unistd/linux/ftruncate.cpp
@@ -11,11 +11,11 @@
 #include "src/__support/OSUtil/syscall.h" // For internal syscall function.
 #include "src/__support/common.h"
 
+#include "hdr/unistd_macros.h"
 #include "src/__support/macros/config.h"
 #include "src/errno/libc_errno.h"
 #include <stdint.h>      // For uint64_t.
 #include <sys/syscall.h> // For syscall numbers.
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/linux/lseek.cpp b/libc/src/unistd/linux/lseek.cpp
index 9486cecf3b1234..0e957498da7460 100644
--- a/libc/src/unistd/linux/lseek.cpp
+++ b/libc/src/unistd/linux/lseek.cpp
@@ -14,8 +14,8 @@
 #include "src/__support/OSUtil/syscall.h" // For internal syscall function.
 #include "src/__support/common.h"
 
+#include "hdr/types/off_t.h"
 #include <sys/syscall.h> // For syscall numbers.
-#include <unistd.h>      // For off_t.
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/linux/sysconf.cpp b/libc/src/unistd/linux/sysconf.cpp
index 1540eb499ec12d..f785ff321c7d7e 100644
--- a/libc/src/unistd/linux/sysconf.cpp
+++ b/libc/src/unistd/linux/sysconf.cpp
@@ -10,11 +10,11 @@
 
 #include "src/__support/common.h"
 
+#include "hdr/unistd_macros.h"
 #include "src/__support/macros/config.h"
 #include "src/errno/libc_errno.h"
 #include "src/sys/auxv/getauxval.h"
 #include <sys/auxv.h>
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/linux/truncate.cpp b/libc/src/unistd/linux/truncate.cpp
index 283cf4098cf457..8236edb480d108 100644
--- a/libc/src/unistd/linux/truncate.cpp
+++ b/libc/src/unistd/linux/truncate.cpp
@@ -13,9 +13,9 @@
 #include "src/__support/macros/config.h"
 #include "src/errno/libc_errno.h"
 
+#include "hdr/unistd_macros.h"
 #include <stdint.h>      // For uint64_t.
 #include <sys/syscall.h> // For syscall numbers.
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/lseek.h b/libc/src/unistd/lseek.h
index a8704ec7058dd2..4b8ecf173c338f 100644
--- a/libc/src/unistd/lseek.h
+++ b/libc/src/unistd/lseek.h
@@ -9,8 +9,9 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_LSEEK_H
 #define LLVM_LIBC_SRC_UNISTD_LSEEK_H
 
+#include "hdr/unistd_macros.h"
+#include "include/llvm-libc-types/off_t.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/pread.h b/libc/src/unistd/pread.h
index 4723675e82a20a..54fec6ed41e2be 100644
--- a/libc/src/unistd/pread.h
+++ b/libc/src/unistd/pread.h
@@ -9,8 +9,11 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_PREAD_H
 #define LLVM_LIBC_SRC_UNISTD_PREAD_H
 
+#include "hdr/unistd_macros.h"
+#include "include/llvm-libc-types/off_t.h"
+#include "include/llvm-libc-types/size_t.h"
+#include "include/llvm-libc-types/ssize_t.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/pwrite.h b/libc/src/unistd/pwrite.h
index baffbe48b64371..16700f7cd18d66 100644
--- a/libc/src/unistd/pwrite.h
+++ b/libc/src/unistd/pwrite.h
@@ -9,8 +9,11 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_PWRITE_H
 #define LLVM_LIBC_SRC_UNISTD_PWRITE_H
 
+#include "hdr/unistd_macros.h"
+#include "include/llvm-libc-types/off_t.h"
+#include "include/llvm-libc-types/size_t.h"
+#include "include/llvm-libc-types/ssize_t.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/read.h b/libc/src/unistd/read.h
index 01231cb82e35e5..8722dddad601b3 100644
--- a/libc/src/unistd/read.h
+++ b/libc/src/unistd/read.h
@@ -9,8 +9,9 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_READ_H
 #define LLVM_LIBC_SRC_UNISTD_READ_H
 
+#include "hdr/unistd_macros.h"
+#include "include/llvm-libc-types/ssize_t.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/readlink.h b/libc/src/unistd/readlink.h
index a73e9740c74637..8a422be7fd7c4a 100644
--- a/libc/src/unistd/readlink.h
+++ b/libc/src/unistd/readlink.h
@@ -9,8 +9,10 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_READLINK_H
 #define LLVM_LIBC_SRC_UNISTD_READLINK_H
 
+#include "hdr/unistd_macros.h"
+#include "include/llvm-libc-types/size_t.h"
+#include "include/llvm-libc-types/ssize_t.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/readlinkat.h b/libc/src/unistd/readlinkat.h
index 6bdd48b537fc8c..10fd8bb6a14b8d 100644
--- a/libc/src/unistd/readlinkat.h
+++ b/libc/src/unistd/readlinkat.h
@@ -9,8 +9,8 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_READLINKAT_H
 #define LLVM_LIBC_SRC_UNISTD_READLINKAT_H
 
+#include "hdr/unistd_macros.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/swab.h b/libc/src/unistd/swab.h
index caa9c71001097b..f6fa3414c43f55 100644
--- a/libc/src/unistd/swab.h
+++ b/libc/src/unistd/swab.h
@@ -9,8 +9,8 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_SWAB_H
 #define LLVM_LIBC_SRC_UNISTD_SWAB_H
 
+#include "hdr/types/ssize_t.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h> // For ssize_t
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/symlink.h b/libc/src/unistd/symlink.h
index 47f04f8845b460..c743a32a8930f9 100644
--- a/libc/src/unistd/symlink.h
+++ b/libc/src/unistd/symlink.h
@@ -9,8 +9,8 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_SYMLINK_H
 #define LLVM_LIBC_SRC_UNISTD_SYMLINK_H
 
+#include "hdr/unistd_macros.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/symlinkat.h b/libc/src/unistd/symlinkat.h
index 9f8ad517af5a62..6697ce4d537e6a 100644
--- a/libc/src/unistd/symlinkat.h
+++ b/libc/src/unistd/symlinkat.h
@@ -9,8 +9,8 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_SYMLINKAT_H
 #define LLVM_LIBC_SRC_UNISTD_SYMLINKAT_H
 
+#include "hdr/unistd_macros.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/syscall.h b/libc/src/unistd/syscall.h
index db70745719cfe3..7f82bd8a452f62 100644
--- a/libc/src/unistd/syscall.h
+++ b/libc/src/unistd/syscall.h
@@ -9,9 +9,9 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_SYSCALL_H
 #define LLVM_LIBC_SRC_UNISTD_SYSCALL_H
 
+#include "hdr/unistd_macros.h"
 #include "src/__support/macros/config.h"
 #include <stdarg.h>
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/sysconf.h b/libc/src/unistd/sysconf.h
index 1b3f39e413508b..470c4d846568c7 100644
--- a/libc/src/unistd/sysconf.h
+++ b/libc/src/unistd/sysconf.h
@@ -9,8 +9,8 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_SYSCONF_H
 #define LLVM_LIBC_SRC_UNISTD_SYSCONF_H
 
+#include "hdr/unistd_macros.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/truncate.h b/libc/src/unistd/truncate.h
index 9ba5cf83175291..5206a864bcf5db 100644
--- a/libc/src/unistd/truncate.h
+++ b/libc/src/unistd/truncate.h
@@ -9,8 +9,8 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_TRUNCATE_H
 #define LLVM_LIBC_SRC_UNISTD_TRUNCATE_H
 
+#include "hdr/unistd_macros.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {
 
diff --git a/libc/src/unistd/write.h b/libc/src/unistd/write.h
index e40ce19e21769c..a22660211c150c 100644
--- a/libc/src/unistd/write.h
+++ b/libc/src/unistd/write.h
@@ -9,8 +9,9 @@
 #ifndef LLVM_LIBC_SRC_UNISTD_WRITE_H
 #define LLVM_LIBC_SRC_UNISTD_WRITE_H
 
+#include "hdr/unistd_macros.h"
+#include "include/llvm-libc-types/ssize_t.h"
 #include "src/__support/macros/config.h"
-#include <unistd.h>
 
 namespace LIBC_NAMESPACE_DECL {

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