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<title>Enum MemoryProtection
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<article class="content wrap" id="_content" data-uid="Dalamud.Memory.MemoryProtection">
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<h1 id="Dalamud_Memory_MemoryProtection" data-uid="Dalamud.Memory.MemoryProtection" class="text-break">Enum MemoryProtection
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</h1>
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<div class="markdown level0 summary"><p>PAGE_* from memoryapi.</p>
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</div>
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<div class="markdown level0 conceptual"></div>
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<h6><strong>Namespace</strong>: <a class="xref" href="Dalamud.Memory.html">Dalamud.Memory</a></h6>
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<h6><strong>Assembly</strong>: Dalamud.dll</h6>
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<h5 id="Dalamud_Memory_MemoryProtection_syntax">Syntax</h5>
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<div class="codewrapper">
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<pre><code class="lang-csharp hljs">[Flags]
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public enum MemoryProtection</code></pre>
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</div>
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<h3 id="fields">Fields
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</h3>
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<table class="table table-bordered table-striped table-condensed">
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<thead>
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<tr>
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<th>Name</th>
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<th>Description</th>
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</tr>
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<thead>
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<tbody>
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<tr>
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<td id="Dalamud_Memory_MemoryProtection_Execute">Execute</td>
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<td><p>Enables execute access to the committed region of pages. An attempt to write to the committed region results
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in an access violation. This flag is not supported by the CreateFileMapping function.</p>
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</td>
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</tr>
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<tr>
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<td id="Dalamud_Memory_MemoryProtection_ExecuteRead">ExecuteRead</td>
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<td><p>Enables execute or read-only access to the committed region of pages. An attempt to write to the committed region
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results in an access violation.</p>
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</td>
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</tr>
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<tr>
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<td id="Dalamud_Memory_MemoryProtection_ExecuteReadWrite">ExecuteReadWrite</td>
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<td><p>Enables execute, read-only, or read/write access to the committed region of pages.</p>
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</td>
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</tr>
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<tr>
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<td id="Dalamud_Memory_MemoryProtection_ExecuteWriteCopy">ExecuteWriteCopy</td>
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<td><p>Enables execute, read-only, or copy-on-write access to a mapped view of a file mapping object. An attempt to
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write to a committed copy-on-write page results in a private copy of the page being made for the process. The
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private page is marked as PAGE_EXECUTE_READWRITE, and the change is written to the new page. This flag is not
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supported by the VirtualAlloc or VirtualAllocEx functions.</p>
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</td>
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</tr>
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<tr>
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<td id="Dalamud_Memory_MemoryProtection_Guard">Guard</td>
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<td><p>Pages in the region become guard pages. Any attempt to access a guard page causes the system to raise a
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STATUS_GUARD_PAGE_VIOLATION exception and turn off the guard page status. Guard pages thus act as a one-time
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access alarm. For more information, see Creating Guard Pages. When an access attempt leads the system to turn
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off guard page status, the underlying page protection takes over. If a guard page exception occurs during a
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system service, the service typically returns a failure status indicator. This value cannot be used with
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PAGE_NOACCESS. This flag is not supported by the CreateFileMapping function.</p>
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</td>
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</tr>
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<tr>
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<td id="Dalamud_Memory_MemoryProtection_NoAccess">NoAccess</td>
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<td><p>Disables all access to the committed region of pages. An attempt to read from, write to, or execute the committed
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region results in an access violation. This flag is not supported by the CreateFileMapping function.</p>
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</td>
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</tr>
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<tr>
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<td id="Dalamud_Memory_MemoryProtection_NoCache">NoCache</td>
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<td><p>Sets all pages to be non-cachable. Applications should not use this attribute except when explicitly required
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for a device. Using the interlocked functions with memory that is mapped with SEC_NOCACHE can result in an
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EXCEPTION_ILLEGAL_INSTRUCTION exception. The PAGE_NOCACHE flag cannot be used with the PAGE_GUARD, PAGE_NOACCESS,
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or PAGE_WRITECOMBINE flags. The PAGE_NOCACHE flag can be used only when allocating private memory with the
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VirtualAlloc, VirtualAllocEx, or VirtualAllocExNuma functions. To enable non-cached memory access for shared
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memory, specify the SEC_NOCACHE flag when calling the CreateFileMapping function.</p>
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</td>
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</tr>
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<tr>
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<td id="Dalamud_Memory_MemoryProtection_ReadOnly">ReadOnly</td>
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<td><p>Enables read-only access to the committed region of pages. An attempt to write to the committed region results
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in an access violation. If Data Execution Prevention is enabled, an attempt to execute code in the committed
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region results in an access violation.</p>
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</td>
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</tr>
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<tr>
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<td id="Dalamud_Memory_MemoryProtection_ReadWrite">ReadWrite</td>
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<td><p>Enables read-only or read/write access to the committed region of pages. If Data Execution Prevention is enabled,
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attempting to execute code in the committed region results in an access violation.</p>
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</td>
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</tr>
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<tr>
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<td id="Dalamud_Memory_MemoryProtection_TargetsInvalid">TargetsInvalid</td>
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<td><p>Sets all locations in the pages as invalid targets for CFG. Used along with any execute page protection like
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PAGE_EXECUTE, PAGE_EXECUTE_READ, PAGE_EXECUTE_READWRITE and PAGE_EXECUTE_WRITECOPY. Any indirect call to locations
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in those pages will fail CFG checks and the process will be terminated. The default behavior for executable
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pages allocated is to be marked valid call targets for CFG. This flag is not supported by the VirtualProtect
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or CreateFileMapping functions.</p>
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</td>
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</tr>
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<tr>
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<td id="Dalamud_Memory_MemoryProtection_TargetsNoUpdate">TargetsNoUpdate</td>
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<td><p>Pages in the region will not have their CFG information updated while the protection changes for VirtualProtect.
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For example, if the pages in the region was allocated using PAGE_TARGETS_INVALID, then the invalid information
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will be maintained while the page protection changes. This flag is only valid when the protection changes to
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an executable type like PAGE_EXECUTE, PAGE_EXECUTE_READ, PAGE_EXECUTE_READWRITE and PAGE_EXECUTE_WRITECOPY.
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The default behavior for VirtualProtect protection change to executable is to mark all locations as valid call
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targets for CFG.</p>
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</td>
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</tr>
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<tr>
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<td id="Dalamud_Memory_MemoryProtection_WriteCombine">WriteCombine</td>
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<td><p>Sets all pages to be write-combined. Applications should not use this attribute except when explicitly required
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for a device. Using the interlocked functions with memory that is mapped as write-combined can result in an
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EXCEPTION_ILLEGAL_INSTRUCTION exception. The PAGE_WRITECOMBINE flag cannot be specified with the PAGE_NOACCESS,
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PAGE_GUARD, and PAGE_NOCACHE flags. The PAGE_WRITECOMBINE flag can be used only when allocating private memory
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with the VirtualAlloc, VirtualAllocEx, or VirtualAllocExNuma functions. To enable write-combined memory access
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for shared memory, specify the SEC_WRITECOMBINE flag when calling the CreateFileMapping function.</p>
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</td>
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</tr>
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<tr>
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<td id="Dalamud_Memory_MemoryProtection_WriteCopy">WriteCopy</td>
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<td><p>Enables read-only or copy-on-write access to a mapped view of a file mapping object. An attempt to write to
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a committed copy-on-write page results in a private copy of the page being made for the process. The private
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page is marked as PAGE_READWRITE, and the change is written to the new page. If Data Execution Prevention is
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enabled, attempting to execute code in the committed region results in an access violation. This flag is not
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supported by the VirtualAlloc or VirtualAllocEx functions.</p>
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</td>
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</tr>
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</tbody>
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</thead></thead></table>
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<h3 id="extensionmethods">Extension Methods</h3>
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<div>
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<a class="xref" href="Dalamud.Utility.EnumExtensions.html#Dalamud_Utility_EnumExtensions_GetAttribute__1_System_Enum_">EnumExtensions.GetAttribute<TAttribute>()</a>
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</div>
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</article>
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<a href="https://github.com/goatcorp/Dalamud/new/master/apiSpec/new?filename=Dalamud_Memory_MemoryProtection.md&value=---%0Auid%3A%20Dalamud.Memory.MemoryProtection%0Asummary%3A%20'*You%20can%20override%20summary%20for%20the%20API%20here%20using%20*MARKDOWN*%20syntax'%0A---%0A%0A*Please%20type%20below%20more%20information%20about%20this%20API%3A*%0A%0A" class="contribution-link">Improve this Doc</a>
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<a href="https://github.com/goatcorp/Dalamud/blob/master/Dalamud/Memory/MemoryProtection.cs/#L10" class="contribution-link">View Source</a>
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