[libc-commits] [libc] [libc] Implement close_range in unistd (PR #236913)

[Pavel Labath via libc-commits]

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@@ -0,0 +1,42 @@
+//===----------------------------------------------------------------------===//
+//
+// 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
+/// Syscall wrapper for close_range.
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_SYSCALL_WRAPPERS_CLOSE_RANGE_H
+#define LLVM_LIBC_SRC___SUPPORT_OSUTIL_LINUX_SYSCALL_WRAPPERS_CLOSE_RANGE_H
+
+#include "hdr/errno_macros.h"
+#include "src/__support/OSUtil/linux/syscall.h" // 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> close_range(unsigned int first, unsigned int last,
+                                     unsigned int flags) {
+#ifdef SYS_close_range
+  return syscall_checked<int>(SYS_close_range, first, last, flags);
+#else
+  (void)first;
+  (void)last;
+  (void)flags;
+  return -ENOSYS;
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labath wrote:

We only support kernels down to 5.10, so this shouldn't be necessary.

https://github.com/llvm/llvm-project/pull/236913