[libc-commits] [libc] [libc][NFC] wrap prlimit64 and refactor getrlimit/setrlimit (PR #204306)

[Jeff Bailey via libc-commits]

https://github.com/kaladron created https://github.com/llvm/llvm-project/pull/204306

Assisted-by: Automated tooling, human reviewed.

>From e7ddb7a112804e659f2d4003cd461b6b993d807b Mon Sep 17 00:00:00 2001
From: Jeff Bailey <jbailey at raspberryginger.com>
Date: Wed, 17 Jun 2026 08:29:32 +0100
Subject: [PATCH] [libc][NFC] wrap prlimit64 and refactor getrlimit/setrlimit

Assisted-by: Automated tooling, human reviewed.
---
 .../linux/syscall_wrappers/CMakeLists.txt     | 13 ++++++++
 .../OSUtil/linux/syscall_wrappers/prlimit.h   | 30 +++++++++++++++++++
 libc/src/sys/resource/linux/CMakeLists.txt    |  6 ++--
 libc/src/sys/resource/linux/getrlimit.cpp     | 10 +++----
 libc/src/sys/resource/linux/setrlimit.cpp     | 10 +++----
 5 files changed, 53 insertions(+), 16 deletions(-)
 create mode 100644 libc/src/__support/OSUtil/linux/syscall_wrappers/prlimit.h

diff --git a/libc/src/__support/OSUtil/linux/syscall_wrappers/CMakeLists.txt b/libc/src/__support/OSUtil/linux/syscall_wrappers/CMakeLists.txt
index 36af7ffa898f1..d558abb8f6b5d 100644
--- a/libc/src/__support/OSUtil/linux/syscall_wrappers/CMakeLists.txt
+++ b/libc/src/__support/OSUtil/linux/syscall_wrappers/CMakeLists.txt
@@ -759,3 +759,16 @@ add_header_library(
     libc.hdr.types.off_t
     libc.include.sys_syscall
 )
+
+add_header_library(
+  prlimit
+  HDRS
+    prlimit.h
+  DEPENDS
+    libc.src.__support.OSUtil.osutil
+    libc.src.__support.common
+    libc.src.__support.error_or
+    libc.src.__support.macros.config
+    libc.include.sys_syscall
+)
+
diff --git a/libc/src/__support/OSUtil/linux/syscall_wrappers/prlimit.h b/libc/src/__support/OSUtil/linux/syscall_wrappers/prlimit.h
new file mode 100644
index 0000000000000..961b3a95a63cc
--- /dev/null
+++ b/libc/src/__support/OSUtil/linux/syscall_wrappers/prlimit.h
@@ -0,0 +1,30 @@
+//===-- Implementation header for prlimit -----------------------*- 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___SUPPORT_OSUTIL_LINUX_SYSCALL_WRAPPERS_PRLIMIT_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_SYSCALL_WRAPPERS_PRLIMIT_H
+
+#include "src/__support/OSUtil/linux/syscall.h" // For syscall_checked
+#include "src/__support/common.h"
+#include "src/__support/error_or.h"
+#include "src/__support/macros/config.h"
+#include <sys/syscall.h> // For syscall numbers
+
+namespace LIBC_NAMESPACE_DECL {
+namespace linux_syscalls {
+
+LIBC_INLINE ErrorOr<int> prlimit(int pid, int resource, const void *new_limit,
+                                 void *old_limit) {
+  return syscall_checked<int>(SYS_prlimit64, pid, resource, new_limit,
+                              old_limit);
+}
+
+} // namespace linux_syscalls
+} // namespace LIBC_NAMESPACE_DECL
+
+#endif // LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_SYSCALL_WRAPPERS_PRLIMIT_H
diff --git a/libc/src/sys/resource/linux/CMakeLists.txt b/libc/src/sys/resource/linux/CMakeLists.txt
index 9f0fdad3b0fdf..ac59621f96f13 100644
--- a/libc/src/sys/resource/linux/CMakeLists.txt
+++ b/libc/src/sys/resource/linux/CMakeLists.txt
@@ -7,8 +7,7 @@ add_entrypoint_object(
   DEPENDS
     libc.hdr.types.struct_rlimit
     libc.include.sys_resource
-    libc.include.sys_syscall
-    libc.src.__support.OSUtil.osutil
+    libc.src.__support.OSUtil.linux.syscall_wrappers.prlimit
     libc.src.errno.errno
 )
 
@@ -21,7 +20,6 @@ add_entrypoint_object(
   DEPENDS
     libc.hdr.types.struct_rlimit
     libc.include.sys_resource
-    libc.include.sys_syscall
-    libc.src.__support.OSUtil.osutil
+    libc.src.__support.OSUtil.linux.syscall_wrappers.prlimit
     libc.src.errno.errno
 )
diff --git a/libc/src/sys/resource/linux/getrlimit.cpp b/libc/src/sys/resource/linux/getrlimit.cpp
index a3234ebf4f90b..1b8f54ca47a93 100644
--- a/libc/src/sys/resource/linux/getrlimit.cpp
+++ b/libc/src/sys/resource/linux/getrlimit.cpp
@@ -9,19 +9,17 @@
 #include "src/sys/resource/getrlimit.h"
 
 #include "hdr/types/struct_rlimit.h"
-#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/__support/OSUtil/linux/syscall_wrappers/prlimit.h"
 #include "src/__support/common.h"
 #include "src/__support/libc_errno.h"
 #include "src/__support/macros/config.h"
-#include <sys/syscall.h> // For syscall numbers.
 
 namespace LIBC_NAMESPACE_DECL {
 
 LLVM_LIBC_FUNCTION(int, getrlimit, (int res, struct rlimit *limits)) {
-  int ret =
-      LIBC_NAMESPACE::syscall_impl<int>(SYS_prlimit64, 0, res, nullptr, limits);
-  if (ret < 0) {
-    libc_errno = -ret;
+  auto result = linux_syscalls::prlimit(0, res, nullptr, limits);
+  if (!result) {
+    libc_errno = result.error();
     return -1;
   }
   return 0;
diff --git a/libc/src/sys/resource/linux/setrlimit.cpp b/libc/src/sys/resource/linux/setrlimit.cpp
index e2c2b379e7087..0e4396a1ac9ad 100644
--- a/libc/src/sys/resource/linux/setrlimit.cpp
+++ b/libc/src/sys/resource/linux/setrlimit.cpp
@@ -9,19 +9,17 @@
 #include "src/sys/resource/setrlimit.h"
 
 #include "hdr/types/struct_rlimit.h"
-#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/__support/OSUtil/linux/syscall_wrappers/prlimit.h"
 #include "src/__support/common.h"
 #include "src/__support/libc_errno.h"
 #include "src/__support/macros/config.h"
-#include <sys/syscall.h> // For syscall numbers.
 
 namespace LIBC_NAMESPACE_DECL {
 
 LLVM_LIBC_FUNCTION(int, setrlimit, (int res, const struct rlimit *limits)) {
-  int ret =
-      LIBC_NAMESPACE::syscall_impl<int>(SYS_prlimit64, 0, res, limits, nullptr);
-  if (ret < 0) {
-    libc_errno = -ret;
+  auto result = linux_syscalls::prlimit(0, res, limits, nullptr);
+  if (!result) {
+    libc_errno = result.error();
     return -1;
   }
   return 0;