[libc-commits] [libc] Process mrelease (PR #117503)

[Schrodinger ZHU Yifan via libc-commits]

================
@@ -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);
+
+  if (ret < 0) {
+    libc_errno = static_cast<int>(-ret);
+    return libc_errno;
----------------
SchrodingerZhu wrote:

According to https://github.com/bminor/glibc/blob/d92a5e1dad39ab0ac09ab1beeb055c1f1d981cd4/sysdeps/unix/sysv/linux/tst-process_mrelease.c#L50, `-1` is expected on error

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