[libc-commits] [libc] [libc] Add sys/param.h header (PR #200559)
Jeff Bailey via libc-commits
libc-commits at lists.llvm.org
Sat May 30 02:45:39 PDT 2026
https://github.com/kaladron created https://github.com/llvm/llvm-project/pull/200559
Added the sys/param.h header containing standard BSD macros:
* NBBY
* MIN and MAX
* howmany, roundup, and powerof2
* MAXPATHLEN
The macros are defined in llvm-libc-macros/sys-param-macros.h with guards to prevent redefinition conflicts.
Enabled the header for x86_64, aarch64, riscv, and arm Linux targets.
Assisted-by: Automated tooling, human reviewed.
>From 74f010899a361a9e0437b60dde87cc82d7846943 Mon Sep 17 00:00:00 2001
From: Jeff Bailey <jbailey at raspberryginger.com>
Date: Sat, 30 May 2026 10:35:26 +0100
Subject: [PATCH] [libc] Add sys/param.h header
Added the sys/param.h header containing standard BSD macros:
* NBBY
* MIN and MAX
* howmany, roundup, and powerof2
* MAXPATHLEN
The macros are defined in llvm-libc-macros/sys-param-macros.h with
guards to prevent redefinition conflicts.
Enabled the header for x86_64, aarch64, riscv, and arm Linux targets.
Assisted-by: Automated tooling, human reviewed.
---
libc/config/linux/aarch64/headers.txt | 1 +
libc/config/linux/arm/headers.txt | 1 +
libc/config/linux/riscv/headers.txt | 1 +
libc/config/linux/x86_64/headers.txt | 1 +
libc/include/CMakeLists.txt | 9 +++
libc/include/llvm-libc-macros/CMakeLists.txt | 8 +++
.../llvm-libc-macros/sys-param-macros.h | 56 +++++++++++++++++++
libc/include/sys/param.yaml | 22 ++++++++
8 files changed, 99 insertions(+)
create mode 100644 libc/include/llvm-libc-macros/sys-param-macros.h
create mode 100644 libc/include/sys/param.yaml
diff --git a/libc/config/linux/aarch64/headers.txt b/libc/config/linux/aarch64/headers.txt
index 0e136586cf35b..60ee8ec28b5fa 100644
--- a/libc/config/linux/aarch64/headers.txt
+++ b/libc/config/linux/aarch64/headers.txt
@@ -40,6 +40,7 @@ set(TARGET_PUBLIC_HEADERS
libc.include.sys_epoll
libc.include.sys_ioctl
libc.include.sys_mman
+ libc.include.sys_param
libc.include.sys_personality
libc.include.sys_prctl
libc.include.sys_queue
diff --git a/libc/config/linux/arm/headers.txt b/libc/config/linux/arm/headers.txt
index 6a0b285944698..4f774a0fd8935 100644
--- a/libc/config/linux/arm/headers.txt
+++ b/libc/config/linux/arm/headers.txt
@@ -20,6 +20,7 @@ set(TARGET_PUBLIC_HEADERS
libc.include.wchar
libc.include.wctype
+ libc.include.sys_param
libc.include.sys_personality
# Disabled due to epoll_wait syscalls not being available on this platform.
diff --git a/libc/config/linux/riscv/headers.txt b/libc/config/linux/riscv/headers.txt
index 4b3766d74de2e..4f3181278d2db 100644
--- a/libc/config/linux/riscv/headers.txt
+++ b/libc/config/linux/riscv/headers.txt
@@ -40,6 +40,7 @@ set(TARGET_PUBLIC_HEADERS
libc.include.sys_epoll
libc.include.sys_ioctl
libc.include.sys_mman
+ libc.include.sys_param
libc.include.sys_personality
libc.include.sys_prctl
libc.include.sys_queue
diff --git a/libc/config/linux/x86_64/headers.txt b/libc/config/linux/x86_64/headers.txt
index 2ea83e963bd58..44a8acecdf30f 100644
--- a/libc/config/linux/x86_64/headers.txt
+++ b/libc/config/linux/x86_64/headers.txt
@@ -42,6 +42,7 @@ set(TARGET_PUBLIC_HEADERS
libc.include.sys_ioctl
libc.include.sys_ipc
libc.include.sys_mman
+ libc.include.sys_param
libc.include.sys_personality
libc.include.sys_prctl
libc.include.sys_queue
diff --git a/libc/include/CMakeLists.txt b/libc/include/CMakeLists.txt
index f16e0d9056b23..35fc83b0148e1 100644
--- a/libc/include/CMakeLists.txt
+++ b/libc/include/CMakeLists.txt
@@ -668,6 +668,15 @@ add_header_macro(
.llvm-libc-types.ssize_t
)
+add_header_macro(
+ sys_param
+ ../libc/include/sys/param.yaml
+ sys/param.h
+ DEPENDS
+ .llvm_libc_common_h
+ .llvm-libc-macros.sys_param_macros
+)
+
add_header_macro(
sys_personality
../libc/include/sys/personality.yaml
diff --git a/libc/include/llvm-libc-macros/CMakeLists.txt b/libc/include/llvm-libc-macros/CMakeLists.txt
index 3472642941613..952da4a5544d9 100644
--- a/libc/include/llvm-libc-macros/CMakeLists.txt
+++ b/libc/include/llvm-libc-macros/CMakeLists.txt
@@ -267,6 +267,14 @@ add_macro_header(
sys-personality-macros.h
)
+add_macro_header(
+ sys_param_macros
+ HDR
+ sys-param-macros.h
+ DEPENDS
+ .limits_macros
+)
+
add_macro_header(
sys_queue_macros
HDR
diff --git a/libc/include/llvm-libc-macros/sys-param-macros.h b/libc/include/llvm-libc-macros/sys-param-macros.h
new file mode 100644
index 0000000000000..f0e42418c0140
--- /dev/null
+++ b/libc/include/llvm-libc-macros/sys-param-macros.h
@@ -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
+/// Definition of macros from sys/param.h.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_MACROS_SYS_PARAM_MACROS_H
+#define LLVM_LIBC_MACROS_SYS_PARAM_MACROS_H
+
+#include "limits-macros.h"
+
+// Number Bits per BYte
+#ifndef NBBY
+#ifdef __CHAR_BIT__
+#define NBBY __CHAR_BIT__
+#else
+#define NBBY 8
+#endif
+#endif
+
+#ifndef MIN
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#endif
+
+#ifndef MAX
+#define MAX(a,b) (((a)>(b))?(a):(b))
+#endif
+
+#ifndef howmany
+#define howmany(n,d) (((n)+((d)-1))/(d))
+#endif
+
+#ifndef roundup
+#define roundup(n,d) (howmany(n,d)*(d))
+#endif
+
+#ifndef powerof2
+#define powerof2(n) !(((n)-1) & (n))
+#endif
+
+#ifndef MAXPATHLEN
+#ifdef PATH_MAX
+#define MAXPATHLEN PATH_MAX
+#else
+#define MAXPATHLEN 4096
+#endif
+#endif
+
+#endif // LLVM_LIBC_MACROS_SYS_PARAM_MACROS_H
diff --git a/libc/include/sys/param.yaml b/libc/include/sys/param.yaml
new file mode 100644
index 0000000000000..9d14df0a8c33f
--- /dev/null
+++ b/libc/include/sys/param.yaml
@@ -0,0 +1,22 @@
+header: sys/param.h
+standards:
+ - bsd
+macros:
+ - macro_name: NBBY
+ macro_header: sys-param-macros.h
+ - macro_name: MIN
+ macro_header: sys-param-macros.h
+ - macro_name: MAX
+ macro_header: sys-param-macros.h
+ - macro_name: howmany
+ macro_header: sys-param-macros.h
+ - macro_name: roundup
+ macro_header: sys-param-macros.h
+ - macro_name: powerof2
+ macro_header: sys-param-macros.h
+ - macro_name: MAXPATHLEN
+ macro_header: sys-param-macros.h
+types: []
+enums: []
+objects: []
+functions: []
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