[libc-commits] [libc] [libc] Implement process_mrelease. (PR #117503)

[Mikhail R. Gadelha via libc-commits]

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@@ -0,0 +1,33 @@
+//===---------- Linux implementation of the mrelease function -----------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/sys/mman/process_mrelease.h"
+
+#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
+#include "src/__support/common.h"
+
+#include "src/__support/macros/config.h"
+#include "src/errno/libc_errno.h"
+#include <linux/param.h> // For EXEC_PAGESIZE.
+#include <sys/syscall.h> // For syscall numbers.
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(int, process_mrelease, (int pidfd, unsigned int flags)) {
+  long ret =
+      LIBC_NAMESPACE::syscall_impl<int>(SYS_process_mrelease, pidfd, flags);
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mikhailramalho wrote:

you should probably check if SYS_process_mrelease is available before calling it, and error out otherwise. There are a few example on how to do it, #ifdef for the true case, #error for the else

https://github.com/llvm/llvm-project/pull/117503