37 lines · cpp
1//===---------- Linux implementation of the POSIX munmap 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/munmap.h"10 11#include "src/__support/OSUtil/syscall.h" // For internal syscall function.12#include "src/__support/common.h"13 14#include "src/__support/libc_errno.h"15#include "src/__support/macros/config.h"16#include <sys/syscall.h> // For syscall numbers.17 18namespace LIBC_NAMESPACE_DECL {19 20// This function is currently linux only. It has to be refactored suitably if21// mmap is to be supported on non-linux operating systems also.22LLVM_LIBC_FUNCTION(int, munmap, (void *addr, size_t size)) {23 int ret = LIBC_NAMESPACE::syscall_impl<int>(24 SYS_munmap, reinterpret_cast<long>(addr), size);25 26 // A negative return value indicates an error with the magnitude of the27 // value being the error code.28 if (ret < 0) {29 libc_errno = -ret;30 return -1;31 }32 33 return 0;34}35 36} // namespace LIBC_NAMESPACE_DECL37