> For the complete documentation index, see [llms.txt](https://book.bsdcn.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://book.bsdcn.org/man/man9/vm_map_check_protection.9.md).

# vm\_map\_check\_protection.9

`vm_map_check_protection` — 检查 vm\_map 的内存保护

## 名称

`vm_map_check_protection`

## 概要

`#include <sys/param.h>`

`#include <vm/vm.h>`

`#include <vm/vm_map.h>`

`boolean_t vm_map_check_protection(vm_map_t map, vm_offset_t start, vm_offset_t end, vm_prot_t protection)`

## 描述

`vm_map_check_protection()` 函数断言目标 `map` 允许从 `start` 到 `end` 的整个地址范围具有指定特权 `protection`。该区域必须是连续的；不允许有空洞。

## 实现说明

此代码不也不应检查区域内容是否可访问。例如，一个小文件可能映射到比其大得多的地址空间中。

## 返回值

`vm_map_check_protection()` 函数如果允许该特权则返回 TRUE；如果不允许或发生任何其他错误，则返回 FALSE。

## 参见

munmap(2), [vm\_map(9)](/man/man9/vm_map.9.md), [vm\_map\_protect(9)](/man/man9/vm_map_protect.9.md)

## 作者

本手册页由 Bruce M Simpson <bms@spc.org> 编写。


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