41 lines · cpp
1//===------- Linux implementation of the remap_file_pages function --------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/sys/mman/remap_file_pages.h"10 11#include "src/__support/OSUtil/syscall.h" // For internal syscall function.12#include "src/__support/common.h"13#include "src/__support/libc_errno.h"14#include "src/__support/macros/config.h"15#include <sys/syscall.h> // For syscall numbers.16 17namespace LIBC_NAMESPACE_DECL {18 19LLVM_LIBC_FUNCTION(int, remap_file_pages,20 (void *addr, size_t size, int prot, size_t pgoff,21 int flags)) {22#ifdef SYS_remap_file_pages23 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_remap_file_pages,24 reinterpret_cast<long>(addr),25 size, prot, pgoff, flags);26#else27#error "remap_file_pages syscall is not available."28#endif29 30 // A negative return value indicates an error with the magnitude of the31 // value being the error code.32 if (ret < 0) {33 libc_errno = -ret;34 return -1;35 }36 37 return 0;38}39 40} // namespace LIBC_NAMESPACE_DECL41