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-exception
6//
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 if
21// 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 the
27 // 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_DECL
37

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source code of libc/src/sys/mman/linux/munmap.cpp