[libc-commits] [libc] [llvm] [libc] Use a syscall wrapper for `sched_getscheduler` (PR #232597)

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https://github.com/c8ef created https://github.com/llvm/llvm-project/pull/232597

This PR move `sched_getscheduler` behind the centralized syscall wrappers, following `libc/docs/dev/syscall_wrapper_refactor.md`.

>From e3ee14044f47fa28acb954ee42bf767a6c484577 Mon Sep 17 00:00:00 2001
From: c8ef <c8ef at outlook.com>
Date: Fri, 16 Oct 2026 13:05:18 +0800
Subject: [PATCH] [libc] Use a syscall wrapper for sched_getscheduler

---
 libc/src/sched/linux/CMakeLists.txt               |  6 ++++--
 libc/src/sched/linux/sched_getscheduler.cpp       | 11 +++++------
 utils/bazel/llvm-project-overlay/libc/BUILD.bazel | 14 ++++++++++++++
 3 files changed, 23 insertions(+), 8 deletions(-)

diff --git a/libc/src/sched/linux/CMakeLists.txt b/libc/src/sched/linux/CMakeLists.txt
index 1a2db35f426f70..ab6aaaed34103a 100644
--- a/libc/src/sched/linux/CMakeLists.txt
+++ b/libc/src/sched/linux/CMakeLists.txt
@@ -152,8 +152,10 @@ add_entrypoint_object(
     ../sched_getscheduler.h
   DEPENDS
     libc.hdr.types.pid_t
-    libc.include.sys_syscall
-    libc.src.__support.OSUtil.osutil
+    libc.src.__support.OSUtil.linux.syscall_wrappers.sched_getscheduler
+    libc.src.__support.common
+    libc.src.__support.libc_errno
+    libc.src.__support.macros.config
     libc.src.errno.errno
 )
 
diff --git a/libc/src/sched/linux/sched_getscheduler.cpp b/libc/src/sched/linux/sched_getscheduler.cpp
index 10625f280380d5..9849347a056382 100644
--- a/libc/src/sched/linux/sched_getscheduler.cpp
+++ b/libc/src/sched/linux/sched_getscheduler.cpp
@@ -8,23 +8,22 @@
 
 #include "src/sched/sched_getscheduler.h"
 
-#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/__support/OSUtil/linux/syscall_wrappers/sched_getscheduler.h"
 #include "src/__support/common.h"
 #include "src/__support/libc_errno.h"
 #include "src/__support/macros/config.h"
 
 #include "hdr/types/pid_t.h"
-#include <sys/syscall.h> // For syscall numbers.
 
 namespace LIBC_NAMESPACE_DECL {
 
 LLVM_LIBC_FUNCTION(int, sched_getscheduler, (pid_t tid)) {
-  int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_sched_getscheduler, tid);
-  if (ret < 0) {
-    libc_errno = -ret;
+  auto result = linux_syscalls::sched_getscheduler(tid);
+  if (!result) {
+    libc_errno = result.error();
     return -1;
   }
-  return ret;
+  return result.value();
 }
 
 } // namespace LIBC_NAMESPACE_DECL
diff --git a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
index fb25858f2216bc..781a1d1922d8ea 100644
--- a/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
+++ b/utils/bazel/llvm-project-overlay/libc/BUILD.bazel
@@ -16973,6 +16973,20 @@ libc_function(
     ],
 )
 
+libc_function(
+    name = "sched_getscheduler",
+    srcs = ["src/sched/linux/sched_getscheduler.cpp"],
+    hdrs = ["src/sched/sched_getscheduler.h"],
+    deps = [
+        ":__support_common",
+        ":__support_libc_errno",
+        ":__support_macros_config",
+        ":__support_osutil_linux_syscall_wrappers_sched_getscheduler",
+        ":errno",
+        ":types_pid_t",
+    ],
+)
+
 libc_function(
     name = "sched_rr_get_interval",
     srcs = ["src/sched/linux/sched_rr_get_interval.cpp"],