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184 lines
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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Values supported by `Mmap::advise` and `MmapMut::advise` functions."><title>Advice in memmap2 - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="memmap2" data-themes="" 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class="version">0.9.5</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Advice</a></h2><h3><a href="#variants">Variants</a></h3><ul class="block variant"><li><a href="#variant.DoDump" title="DoDump">DoDump</a></li><li><a href="#variant.DoFork" title="DoFork">DoFork</a></li><li><a href="#variant.DontDump" title="DontDump">DontDump</a></li><li><a href="#variant.DontFork" title="DontFork">DontFork</a></li><li><a href="#variant.HugePage" title="HugePage">HugePage</a></li><li><a href="#variant.HwPoison" title="HwPoison">HwPoison</a></li><li><a href="#variant.Mergeable" title="Mergeable">Mergeable</a></li><li><a href="#variant.NoHugePage" title="NoHugePage">NoHugePage</a></li><li><a href="#variant.Normal" title="Normal">Normal</a></li><li><a href="#variant.PopulateRead" title="PopulateRead">PopulateRead</a></li><li><a href="#variant.PopulateWrite" title="PopulateWrite">PopulateWrite</a></li><li><a href="#variant.Random" title="Random">Random</a></li><li><a href="#variant.Sequential" title="Sequential">Sequential</a></li><li><a href="#variant.Unmergeable" title="Unmergeable">Unmergeable</a></li><li><a href="#variant.WillNeed" title="WillNeed">WillNeed</a></li></ul><h3><a href="#implementations">Methods</a></h3><ul class="block method"><li><a href="#method.is_supported" title="is_supported">is_supported</a></li></ul><h3><a href="#trait-implementations">Trait Implementations</a></h3><ul class="block trait-implementation"><li><a href="#impl-Clone-for-Advice" title="Clone">Clone</a></li><li><a href="#impl-Copy-for-Advice" title="Copy">Copy</a></li><li><a href="#impl-Debug-for-Advice" title="Debug">Debug</a></li><li><a href="#impl-Eq-for-Advice" title="Eq">Eq</a></li><li><a href="#impl-Hash-for-Advice" title="Hash">Hash</a></li><li><a href="#impl-PartialEq-for-Advice" title="PartialEq">PartialEq</a></li><li><a href="#impl-StructuralPartialEq-for-Advice" title="StructuralPartialEq">StructuralPartialEq</a></li></ul><h3><a href="#synthetic-implementations">Auto Trait Implementations</a></h3><ul class="block synthetic-implementation"><li><a href="#impl-Freeze-for-Advice" title="Freeze">Freeze</a></li><li><a href="#impl-RefUnwindSafe-for-Advice" title="RefUnwindSafe">RefUnwindSafe</a></li><li><a href="#impl-Send-for-Advice" title="Send">Send</a></li><li><a href="#impl-Sync-for-Advice" title="Sync">Sync</a></li><li><a href="#impl-Unpin-for-Advice" title="Unpin">Unpin</a></li><li><a href="#impl-UnwindSafe-for-Advice" title="UnwindSafe">UnwindSafe</a></li></ul><h3><a href="#blanket-implementations">Blanket Implementations</a></h3><ul class="block blanket-implementation"><li><a href="#impl-Any-for-T" title="Any">Any</a></li><li><a href="#impl-Borrow%3CT%3E-for-T" title="Borrow<T>">Borrow<T></a></li><li><a href="#impl-BorrowMut%3CT%3E-for-T" title="BorrowMut<T>">BorrowMut<T></a></li><li><a href="#impl-CloneToUninit-for-T" title="CloneToUninit">CloneToUninit</a></li><li><a href="#impl-From%3CT%3E-for-T" title="From<T>">From<T></a></li><li><a href="#impl-Into%3CU%3E-for-T" title="Into<U>">Into<U></a></li><li><a href="#impl-ToOwned-for-T" title="ToOwned">ToOwned</a></li><li><a href="#impl-TryFrom%3CU%3E-for-T" title="TryFrom<U>">TryFrom<U></a></li><li><a href="#impl-TryInto%3CU%3E-for-T" title="TryInto<U>">TryInto<U></a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="index.html">In crate memmap2</a></h2></div></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><span class="rustdoc-breadcrumbs"><a href="index.html">memmap2</a></span><h1>Enum <span class="enum">Advice</span><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../src/memmap2/advice.rs.html#6-235">Source</a> </span></div><pre class="rust item-decl"><code><div class="code-attribute">#[repr(i32)]</div>pub enum Advice {
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<details class="toggle type-contents-toggle"><summary class="hideme"><span>Show 15 variants</span></summary> Normal = 0,
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Random = 1,
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Sequential = 2,
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WillNeed = 3,
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DontFork = 10,
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DoFork = 11,
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Mergeable = 12,
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Unmergeable = 13,
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HugePage = 14,
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NoHugePage = 15,
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DontDump = 16,
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DoDump = 17,
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HwPoison = 100,
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PopulateRead = 22,
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PopulateWrite = 23,
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</details>}</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Values supported by <a href="struct.Mmap.html#method.advise" title="method memmap2::Mmap::advise"><code>Mmap::advise</code></a> and <a href="struct.MmapMut.html#method.advise" title="method memmap2::MmapMut::advise"><code>MmapMut::advise</code></a> functions.</p>
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<p>See <a href="https://man7.org/linux/man-pages/man2/madvise.2.html">madvise()</a> map page.</p>
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</div></details><h2 id="variants" class="variants section-header">Variants<a href="#variants" class="anchor">§</a></h2><div class="variants"><section id="variant.Normal" class="variant"><a href="#variant.Normal" class="anchor">§</a><h3 class="code-header">Normal = 0</h3></section><div class="docblock"><p><strong>MADV_NORMAL</strong></p>
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<p>No special treatment. This is the default.</p>
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</div><section id="variant.Random" class="variant"><a href="#variant.Random" class="anchor">§</a><h3 class="code-header">Random = 1</h3></section><div class="docblock"><p><strong>MADV_RANDOM</strong></p>
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<p>Expect page references in random order. (Hence, read
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ahead may be less useful than normally.)</p>
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</div><section id="variant.Sequential" class="variant"><a href="#variant.Sequential" class="anchor">§</a><h3 class="code-header">Sequential = 2</h3></section><div class="docblock"><p><strong>MADV_SEQUENTIAL</strong></p>
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<p>Expect page references in sequential order. (Hence, pages
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in the given range can be aggressively read ahead, and may
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be freed soon after they are accessed.)</p>
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</div><section id="variant.WillNeed" class="variant"><a href="#variant.WillNeed" class="anchor">§</a><h3 class="code-header">WillNeed = 3</h3></section><div class="docblock"><p><strong>MADV_WILLNEED</strong></p>
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<p>Expect access in the near future. (Hence, it might be a
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good idea to read some pages ahead.)</p>
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</div><section id="variant.DontFork" class="variant"><a href="#variant.DontFork" class="anchor">§</a><h3 class="code-header">DontFork = 10</h3></section><div class="docblock"><p><strong>MADV_DONTFORK</strong> - Linux only (since Linux 2.6.16)</p>
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<p>Do not make the pages in this range available to the child
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after a fork(2). This is useful to prevent copy-on-write
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semantics from changing the physical location of a page if
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the parent writes to it after a fork(2). (Such page
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relocations cause problems for hardware that DMAs into the
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page.)</p>
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</div><section id="variant.DoFork" class="variant"><a href="#variant.DoFork" class="anchor">§</a><h3 class="code-header">DoFork = 11</h3></section><div class="docblock"><p><strong>MADV_DOFORK</strong> - Linux only (since Linux 2.6.16)</p>
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<p>Undo the effect of MADV_DONTFORK, restoring the default
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behavior, whereby a mapping is inherited across fork(2).</p>
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</div><section id="variant.Mergeable" class="variant"><a href="#variant.Mergeable" class="anchor">§</a><h3 class="code-header">Mergeable = 12</h3></section><div class="docblock"><p><strong>MADV_MERGEABLE</strong> - Linux only (since Linux 2.6.32)</p>
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<p>Enable Kernel Samepage Merging (KSM) for the pages in the
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range specified by addr and length. The kernel regularly
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scans those areas of user memory that have been marked as
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mergeable, looking for pages with identical content.
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These are replaced by a single write-protected page (which
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is automatically copied if a process later wants to update
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the content of the page). KSM merges only private
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anonymous pages (see mmap(2)).</p>
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<p>The KSM feature is intended for applications that generate
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many instances of the same data (e.g., virtualization
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systems such as KVM). It can consume a lot of processing
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power; use with care. See the Linux kernel source file
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Documentation/admin-guide/mm/ksm.rst for more details.</p>
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<p>The MADV_MERGEABLE and MADV_UNMERGEABLE operations are
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available only if the kernel was configured with
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CONFIG_KSM.</p>
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</div><section id="variant.Unmergeable" class="variant"><a href="#variant.Unmergeable" class="anchor">§</a><h3 class="code-header">Unmergeable = 13</h3></section><div class="docblock"><p><strong>MADV_UNMERGEABLE</strong> - Linux only (since Linux 2.6.32)</p>
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<p>Undo the effect of an earlier MADV_MERGEABLE operation on
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the specified address range; KSM unmerges whatever pages
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it had merged in the address range specified by addr and
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length.</p>
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</div><section id="variant.HugePage" class="variant"><a href="#variant.HugePage" class="anchor">§</a><h3 class="code-header">HugePage = 14</h3></section><div class="docblock"><p><strong>MADV_HUGEPAGE</strong> - Linux only (since Linux 2.6.38)</p>
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<p>Enable Transparent Huge Pages (THP) for pages in the range
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specified by addr and length. Currently, Transparent Huge
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Pages work only with private anonymous pages (see
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mmap(2)). The kernel will regularly scan the areas marked
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as huge page candidates to replace them with huge pages.
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The kernel will also allocate huge pages directly when the
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region is naturally aligned to the huge page size (see
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posix_memalign(2)).</p>
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<p>This feature is primarily aimed at applications that use
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large mappings of data and access large regions of that
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memory at a time (e.g., virtualization systems such as
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QEMU). It can very easily waste memory (e.g., a 2 MB
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mapping that only ever accesses 1 byte will result in 2 MB
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of wired memory instead of one 4 KB page). See the Linux
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kernel source file
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Documentation/admin-guide/mm/transhuge.rst for more
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details.</p>
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<p>Most common kernels configurations provide MADV_HUGEPAGE-
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style behavior by default, and thus MADV_HUGEPAGE is
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normally not necessary. It is mostly intended for
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embedded systems, where MADV_HUGEPAGE-style behavior may
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not be enabled by default in the kernel. On such systems,
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this flag can be used in order to selectively enable THP.
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Whenever MADV_HUGEPAGE is used, it should always be in
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regions of memory with an access pattern that the
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developer knows in advance won’t risk to increase the
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memory footprint of the application when transparent
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hugepages are enabled.</p>
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<p>The MADV_HUGEPAGE and MADV_NOHUGEPAGE operations are
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available only if the kernel was configured with
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CONFIG_TRANSPARENT_HUGEPAGE.</p>
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</div><section id="variant.NoHugePage" class="variant"><a href="#variant.NoHugePage" class="anchor">§</a><h3 class="code-header">NoHugePage = 15</h3></section><div class="docblock"><p><strong>MADV_NOHUGEPAGE</strong> - Linux only (since Linux 2.6.38)</p>
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<p>Ensures that memory in the address range specified by addr
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and length will not be backed by transparent hugepages.</p>
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</div><section id="variant.DontDump" class="variant"><a href="#variant.DontDump" class="anchor">§</a><h3 class="code-header">DontDump = 16</h3></section><div class="docblock"><p><strong>MADV_DONTDUMP</strong> - Linux only (since Linux 3.4)</p>
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<p>Exclude from a core dump those pages in the range
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specified by addr and length. This is useful in
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applications that have large areas of memory that are
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known not to be useful in a core dump. The effect of
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<strong>MADV_DONTDUMP</strong> takes precedence over the bit mask that is
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set via the <code>/proc/[pid]/coredump_filter</code> file (see
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core(5)).</p>
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</div><section id="variant.DoDump" class="variant"><a href="#variant.DoDump" class="anchor">§</a><h3 class="code-header">DoDump = 17</h3></section><div class="docblock"><p><strong>MADV_DODUMP</strong> - Linux only (since Linux 3.4)</p>
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<p>Undo the effect of an earlier MADV_DONTDUMP.</p>
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</div><section id="variant.HwPoison" class="variant"><a href="#variant.HwPoison" class="anchor">§</a><h3 class="code-header">HwPoison = 100</h3></section><div class="docblock"><p><strong>MADV_HWPOISON</strong> - Linux only (since Linux 2.6.32)</p>
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<p>Poison the pages in the range specified by addr and length
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and handle subsequent references to those pages like a
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hardware memory corruption. This operation is available
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only for privileged (CAP_SYS_ADMIN) processes. This
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operation may result in the calling process receiving a
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SIGBUS and the page being unmapped.</p>
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<p>This feature is intended for testing of memory error-
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handling code; it is available only if the kernel was
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configured with CONFIG_MEMORY_FAILURE.</p>
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</div><section id="variant.PopulateRead" class="variant"><a href="#variant.PopulateRead" class="anchor">§</a><h3 class="code-header">PopulateRead = 22</h3></section><div class="docblock"><p><strong>MADV_POPULATE_READ</strong> - Linux only (since Linux 5.14)</p>
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<p>Populate (prefault) page tables readable, faulting in all
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pages in the range just as if manually reading from each
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page; however, avoid the actual memory access that would have
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been performed after handling the fault.</p>
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<p>In contrast to MAP_POPULATE, MADV_POPULATE_READ does not hide
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errors, can be applied to (parts of) existing mappings and
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will always populate (prefault) page tables readable. One
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example use case is prefaulting a file mapping, reading all
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file content from disk; however, pages won’t be dirtied and
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consequently won’t have to be written back to disk when
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evicting the pages from memory.</p>
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<p>Depending on the underlying mapping, map the shared zeropage,
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preallocate memory or read the underlying file; files with
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holes might or might not preallocate blocks. If populating
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fails, a SIGBUS signal is not generated; instead, an error is
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returned.</p>
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<p>If MADV_POPULATE_READ succeeds, all page tables have been
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populated (prefaulted) readable once. If MADV_POPULATE_READ
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fails, some page tables might have been populated.</p>
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<p>MADV_POPULATE_READ cannot be applied to mappings without read
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permissions and special mappings, for example, mappings
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marked with kernel-internal flags such as VM_PFNMAP or VM_IO,
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or secret memory regions created using memfd_secret(2).</p>
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<p>Note that with MADV_POPULATE_READ, the process can be killed
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at any moment when the system runs out of memory.</p>
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</div><section id="variant.PopulateWrite" class="variant"><a href="#variant.PopulateWrite" class="anchor">§</a><h3 class="code-header">PopulateWrite = 23</h3></section><div class="docblock"><p><strong>MADV_POPULATE_WRITE</strong> - Linux only (since Linux 5.14)</p>
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<p>Populate (prefault) page tables writable, faulting in all
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pages in the range just as if manually writing to each each
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page; however, avoid the actual memory access that would have
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been performed after handling the fault.</p>
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<p>In contrast to MAP_POPULATE, MADV_POPULATE_WRITE does not
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hide errors, can be applied to (parts of) existing mappings
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and will always populate (prefault) page tables writable.
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One example use case is preallocating memory, breaking any
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CoW (Copy on Write).</p>
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<p>Depending on the underlying mapping, preallocate memory or
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read the underlying file; files with holes will preallocate
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blocks. If populating fails, a SIGBUS signal is not gener‐
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ated; instead, an error is returned.</p>
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<p>If MADV_POPULATE_WRITE succeeds, all page tables have been
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populated (prefaulted) writable once. If MADV_POPULATE_WRITE
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fails, some page tables might have been populated.</p>
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<p>MADV_POPULATE_WRITE cannot be applied to mappings without
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write permissions and special mappings, for example, mappings
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marked with kernel-internal flags such as VM_PFNMAP or VM_IO,
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or secret memory regions created using memfd_secret(2).</p>
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<p>Note that with MADV_POPULATE_WRITE, the process can be killed
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at any moment when the system runs out of memory.</p>
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</div></div><h2 id="implementations" class="section-header">Implementations<a href="#implementations" class="anchor">§</a></h2><div id="implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Advice" class="impl"><a class="src rightside" href="../src/memmap2/advice.rs.html#387-395">Source</a><a href="#impl-Advice" class="anchor">§</a><h3 class="code-header">impl <a class="enum" href="enum.Advice.html" title="enum memmap2::Advice">Advice</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.is_supported" class="method"><a class="src rightside" href="../src/memmap2/advice.rs.html#392-394">Source</a><h4 class="code-header">pub fn <a href="#method.is_supported" class="fn">is_supported</a>(self) -> <a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.bool.html">bool</a></h4></section></summary><div class="docblock"><p>Performs a runtime check if this advice is supported by the kernel.
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Only supported on Linux. See the <a href="https://man7.org/linux/man-pages/man2/madvise.2.html#VERSIONS"><code>madvise(2)</code></a> man page.</p>
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</div></details></div></details></div><h2 id="trait-implementations" class="section-header">Trait Implementations<a href="#trait-implementations" class="anchor">§</a></h2><div id="trait-implementations-list"><details class="toggle implementors-toggle" open><summary><section id="impl-Clone-for-Advice" class="impl"><a class="src rightside" href="../src/memmap2/advice.rs.html#5">Source</a><a href="#impl-Clone-for-Advice" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="enum" href="enum.Advice.html" title="enum memmap2::Advice">Advice</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.clone" class="method trait-impl"><a class="src rightside" href="../src/memmap2/advice.rs.html#5">Source</a><a href="#method.clone" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.84.0/core/clone/trait.Clone.html#tymethod.clone" class="fn">clone</a>(&self) -> <a class="enum" href="enum.Advice.html" title="enum memmap2::Advice">Advice</a></h4></section></summary><div class='docblock'>Returns a copy of the value. <a href="https://doc.rust-lang.org/1.84.0/core/clone/trait.Clone.html#tymethod.clone">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_from" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/1.84.0/src/core/clone.rs.html#174">Source</a></span><a href="#method.clone_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.84.0/core/clone/trait.Clone.html#method.clone_from" class="fn">clone_from</a>(&mut self, source: &Self)</h4></section></summary><div class='docblock'>Performs copy-assignment from <code>source</code>. <a href="https://doc.rust-lang.org/1.84.0/core/clone/trait.Clone.html#method.clone_from">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Debug-for-Advice" class="impl"><a class="src rightside" href="../src/memmap2/advice.rs.html#5">Source</a><a href="#impl-Debug-for-Advice" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="enum" href="enum.Advice.html" title="enum memmap2::Advice">Advice</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.fmt" class="method trait-impl"><a class="src rightside" href="../src/memmap2/advice.rs.html#5">Source</a><a href="#method.fmt" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.84.0/core/fmt/trait.Debug.html#tymethod.fmt" class="fn">fmt</a>(&self, f: &mut <a class="struct" href="https://doc.rust-lang.org/1.84.0/core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a><'_>) -> <a class="type" href="https://doc.rust-lang.org/1.84.0/core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></h4></section></summary><div class='docblock'>Formats the value using the given formatter. <a href="https://doc.rust-lang.org/1.84.0/core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-Hash-for-Advice" class="impl"><a class="src rightside" href="../src/memmap2/advice.rs.html#5">Source</a><a href="#impl-Hash-for-Advice" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/hash/trait.Hash.html" title="trait core::hash::Hash">Hash</a> for <a class="enum" href="enum.Advice.html" title="enum memmap2::Advice">Advice</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.hash" class="method trait-impl"><a class="src rightside" href="../src/memmap2/advice.rs.html#5">Source</a><a href="#method.hash" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.84.0/core/hash/trait.Hash.html#tymethod.hash" class="fn">hash</a><__H: <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/hash/trait.Hasher.html" title="trait core::hash::Hasher">Hasher</a>>(&self, state: <a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.reference.html">&mut __H</a>)</h4></section></summary><div class='docblock'>Feeds this value into the given <a href="https://doc.rust-lang.org/1.84.0/core/hash/trait.Hasher.html" title="trait core::hash::Hasher"><code>Hasher</code></a>. <a href="https://doc.rust-lang.org/1.84.0/core/hash/trait.Hash.html#tymethod.hash">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.hash_slice" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.3.0">1.3.0</span> · <a class="src" href="https://doc.rust-lang.org/1.84.0/src/core/hash/mod.rs.html#235-237">Source</a></span><a href="#method.hash_slice" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.84.0/core/hash/trait.Hash.html#method.hash_slice" class="fn">hash_slice</a><H>(data: &[Self], state: <a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.reference.html">&mut H</a>)<div class="where">where
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H: <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/hash/trait.Hasher.html" title="trait core::hash::Hasher">Hasher</a>,
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Self: <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h4></section></summary><div class='docblock'>Feeds a slice of this type into the given <a href="https://doc.rust-lang.org/1.84.0/core/hash/trait.Hasher.html" title="trait core::hash::Hasher"><code>Hasher</code></a>. <a href="https://doc.rust-lang.org/1.84.0/core/hash/trait.Hash.html#method.hash_slice">Read more</a></div></details></div></details><details class="toggle implementors-toggle" open><summary><section id="impl-PartialEq-for-Advice" class="impl"><a class="src rightside" href="../src/memmap2/advice.rs.html#5">Source</a><a href="#impl-PartialEq-for-Advice" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a> for <a class="enum" href="enum.Advice.html" title="enum memmap2::Advice">Advice</a></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.eq" class="method trait-impl"><a class="src rightside" href="../src/memmap2/advice.rs.html#5">Source</a><a href="#method.eq" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.84.0/core/cmp/trait.PartialEq.html#tymethod.eq" class="fn">eq</a>(&self, other: &<a class="enum" href="enum.Advice.html" title="enum memmap2::Advice">Advice</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>.</div></details><details class="toggle method-toggle" open><summary><section id="method.ne" class="method trait-impl"><span class="rightside"><span class="since" title="Stable since Rust version 1.0.0">1.0.0</span> · <a class="src" href="https://doc.rust-lang.org/1.84.0/src/core/cmp.rs.html#261">Source</a></span><a href="#method.ne" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.84.0/core/cmp/trait.PartialEq.html#method.ne" class="fn">ne</a>(&self, other: <a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.reference.html">&Rhs</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.bool.html">bool</a></h4></section></summary><div class='docblock'>Tests for <code>!=</code>. The default implementation is almost always sufficient,
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and should not be overridden without very good reason.</div></details></div></details><section id="impl-Copy-for-Advice" class="impl"><a class="src rightside" href="../src/memmap2/advice.rs.html#5">Source</a><a href="#impl-Copy-for-Advice" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a> for <a class="enum" href="enum.Advice.html" title="enum memmap2::Advice">Advice</a></h3></section><section id="impl-Eq-for-Advice" class="impl"><a class="src rightside" href="../src/memmap2/advice.rs.html#5">Source</a><a href="#impl-Eq-for-Advice" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="enum" href="enum.Advice.html" title="enum memmap2::Advice">Advice</a></h3></section><section id="impl-StructuralPartialEq-for-Advice" class="impl"><a class="src rightside" href="../src/memmap2/advice.rs.html#5">Source</a><a href="#impl-StructuralPartialEq-for-Advice" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/marker/trait.StructuralPartialEq.html" title="trait core::marker::StructuralPartialEq">StructuralPartialEq</a> for <a class="enum" href="enum.Advice.html" title="enum memmap2::Advice">Advice</a></h3></section></div><h2 id="synthetic-implementations" class="section-header">Auto Trait Implementations<a href="#synthetic-implementations" class="anchor">§</a></h2><div id="synthetic-implementations-list"><section id="impl-Freeze-for-Advice" class="impl"><a href="#impl-Freeze-for-Advice" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/marker/trait.Freeze.html" title="trait core::marker::Freeze">Freeze</a> for <a class="enum" href="enum.Advice.html" title="enum memmap2::Advice">Advice</a></h3></section><section id="impl-RefUnwindSafe-for-Advice" class="impl"><a href="#impl-RefUnwindSafe-for-Advice" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/panic/unwind_safe/trait.RefUnwindSafe.html" title="trait core::panic::unwind_safe::RefUnwindSafe">RefUnwindSafe</a> for <a class="enum" href="enum.Advice.html" title="enum memmap2::Advice">Advice</a></h3></section><section id="impl-Send-for-Advice" class="impl"><a href="#impl-Send-for-Advice" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/marker/trait.Send.html" title="trait core::marker::Send">Send</a> for <a class="enum" href="enum.Advice.html" title="enum memmap2::Advice">Advice</a></h3></section><section id="impl-Sync-for-Advice" class="impl"><a href="#impl-Sync-for-Advice" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/marker/trait.Sync.html" title="trait core::marker::Sync">Sync</a> for <a class="enum" href="enum.Advice.html" title="enum memmap2::Advice">Advice</a></h3></section><section id="impl-Unpin-for-Advice" class="impl"><a href="#impl-Unpin-for-Advice" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/marker/trait.Unpin.html" title="trait core::marker::Unpin">Unpin</a> for <a class="enum" href="enum.Advice.html" title="enum memmap2::Advice">Advice</a></h3></section><section id="impl-UnwindSafe-for-Advice" class="impl"><a href="#impl-UnwindSafe-for-Advice" class="anchor">§</a><h3 class="code-header">impl <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/panic/unwind_safe/trait.UnwindSafe.html" title="trait core::panic::unwind_safe::UnwindSafe">UnwindSafe</a> for <a class="enum" href="enum.Advice.html" title="enum memmap2::Advice">Advice</a></h3></section></div><h2 id="blanket-implementations" class="section-header">Blanket Implementations<a href="#blanket-implementations" class="anchor">§</a></h2><div id="blanket-implementations-list"><details class="toggle implementors-toggle"><summary><section id="impl-Any-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/any.rs.html#138">Source</a><a href="#impl-Any-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/any/trait.Any.html" title="trait core::any::Any">Any</a> for T<div class="where">where
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T: 'static + ?<a class="trait" href="https://doc.rust-lang.org/1.84.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.type_id" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/any.rs.html#139">Source</a><a href="#method.type_id" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.84.0/core/any/trait.Any.html#tymethod.type_id" class="fn">type_id</a>(&self) -> <a class="struct" href="https://doc.rust-lang.org/1.84.0/core/any/struct.TypeId.html" title="struct core::any::TypeId">TypeId</a></h4></section></summary><div class='docblock'>Gets the <code>TypeId</code> of <code>self</code>. <a href="https://doc.rust-lang.org/1.84.0/core/any/trait.Any.html#tymethod.type_id">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Borrow%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/borrow.rs.html#209">Source</a><a href="#impl-Borrow%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/borrow/trait.Borrow.html" title="trait core::borrow::Borrow">Borrow</a><T> for T<div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.84.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/borrow.rs.html#211">Source</a><a href="#method.borrow" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.84.0/core/borrow/trait.Borrow.html#tymethod.borrow" class="fn">borrow</a>(&self) -> <a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.reference.html">&T</a></h4></section></summary><div class='docblock'>Immutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.84.0/core/borrow/trait.Borrow.html#tymethod.borrow">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-BorrowMut%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/borrow.rs.html#217">Source</a><a href="#impl-BorrowMut%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/borrow/trait.BorrowMut.html" title="trait core::borrow::BorrowMut">BorrowMut</a><T> for T<div class="where">where
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T: ?<a class="trait" href="https://doc.rust-lang.org/1.84.0/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.borrow_mut" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/borrow.rs.html#218">Source</a><a href="#method.borrow_mut" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.84.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut" class="fn">borrow_mut</a>(&mut self) -> <a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.reference.html">&mut T</a></h4></section></summary><div class='docblock'>Mutably borrows from an owned value. <a href="https://doc.rust-lang.org/1.84.0/core/borrow/trait.BorrowMut.html#tymethod.borrow_mut">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-CloneToUninit-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/clone.rs.html#273">Source</a><a href="#impl-CloneToUninit-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/clone/trait.CloneToUninit.html" title="trait core::clone::CloneToUninit">CloneToUninit</a> for T<div class="where">where
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T: <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.clone_to_uninit" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/clone.rs.html#275">Source</a><a href="#method.clone_to_uninit" class="anchor">§</a><h4 class="code-header">unsafe fn <a href="https://doc.rust-lang.org/1.84.0/core/clone/trait.CloneToUninit.html#tymethod.clone_to_uninit" class="fn">clone_to_uninit</a>(&self, dst: <a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.pointer.html">*mut </a><a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.u8.html">u8</a>)</h4></section></summary><span class="item-info"><div class="stab unstable"><span class="emoji">🔬</span><span>This is a nightly-only experimental API. (<code>clone_to_uninit</code>)</span></div></span><div class='docblock'>Performs copy-assignment from <code>self</code> to <code>dst</code>. <a href="https://doc.rust-lang.org/1.84.0/core/clone/trait.CloneToUninit.html#tymethod.clone_to_uninit">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-From%3CT%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/convert/mod.rs.html#765">Source</a><a href="#impl-From%3CT%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for T</h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/convert/mod.rs.html#768">Source</a><a href="#method.from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.84.0/core/convert/trait.From.html#tymethod.from" class="fn">from</a>(t: T) -> T</h4></section></summary><div class="docblock"><p>Returns the argument unchanged.</p>
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</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-Into%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/convert/mod.rs.html#748-750">Source</a><a href="#impl-Into%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle method-toggle" open><summary><section id="method.into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/convert/mod.rs.html#758">Source</a><a href="#method.into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.84.0/core/convert/trait.Into.html#tymethod.into" class="fn">into</a>(self) -> U</h4></section></summary><div class="docblock"><p>Calls <code>U::from(self)</code>.</p>
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<p>That is, this conversion is whatever the implementation of
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<code><a href="https://doc.rust-lang.org/1.84.0/core/convert/trait.From.html" title="trait core::convert::From">From</a><T> for U</code> chooses to do.</p>
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</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-ToOwned-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/alloc/borrow.rs.html#82-84">Source</a><a href="#impl-ToOwned-for-T" class="anchor">§</a><h3 class="code-header">impl<T> <a class="trait" href="https://doc.rust-lang.org/1.84.0/alloc/borrow/trait.ToOwned.html" title="trait alloc::borrow::ToOwned">ToOwned</a> for T<div class="where">where
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T: <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Owned" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/alloc/borrow.rs.html#86">Source</a><a href="#associatedtype.Owned" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.84.0/alloc/borrow/trait.ToOwned.html#associatedtype.Owned" class="associatedtype">Owned</a> = T</h4></section></summary><div class='docblock'>The resulting type after obtaining ownership.</div></details><details class="toggle method-toggle" open><summary><section id="method.to_owned" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/alloc/borrow.rs.html#87">Source</a><a href="#method.to_owned" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.84.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned" class="fn">to_owned</a>(&self) -> T</h4></section></summary><div class='docblock'>Creates owned data from borrowed data, usually by cloning. <a href="https://doc.rust-lang.org/1.84.0/alloc/borrow/trait.ToOwned.html#tymethod.to_owned">Read more</a></div></details><details class="toggle method-toggle" open><summary><section id="method.clone_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/alloc/borrow.rs.html#91">Source</a><a href="#method.clone_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.84.0/alloc/borrow/trait.ToOwned.html#method.clone_into" class="fn">clone_into</a>(&self, target: <a class="primitive" href="https://doc.rust-lang.org/1.84.0/std/primitive.reference.html">&mut T</a>)</h4></section></summary><div class='docblock'>Uses borrowed data to replace owned data, usually by cloning. <a href="https://doc.rust-lang.org/1.84.0/alloc/borrow/trait.ToOwned.html#method.clone_into">Read more</a></div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryFrom%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/convert/mod.rs.html#805-807">Source</a><a href="#impl-TryFrom%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/convert/trait.Into.html" title="trait core::convert::Into">Into</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error-1" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/convert/mod.rs.html#809">Source</a><a href="#associatedtype.Error-1" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.84.0/core/convert/trait.TryFrom.html#associatedtype.Error" class="associatedtype">Error</a> = <a class="enum" href="https://doc.rust-lang.org/1.84.0/core/convert/enum.Infallible.html" title="enum core::convert::Infallible">Infallible</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_from" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/convert/mod.rs.html#812">Source</a><a href="#method.try_from" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.84.0/core/convert/trait.TryFrom.html#tymethod.try_from" class="fn">try_from</a>(value: U) -> <a class="enum" href="https://doc.rust-lang.org/1.84.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><T, <T as <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><U>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.84.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details><details class="toggle implementors-toggle"><summary><section id="impl-TryInto%3CU%3E-for-T" class="impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/convert/mod.rs.html#790-792">Source</a><a href="#impl-TryInto%3CU%3E-for-T" class="anchor">§</a><h3 class="code-header">impl<T, U> <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/convert/trait.TryInto.html" title="trait core::convert::TryInto">TryInto</a><U> for T<div class="where">where
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U: <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>,</div></h3></section></summary><div class="impl-items"><details class="toggle" open><summary><section id="associatedtype.Error" class="associatedtype trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/convert/mod.rs.html#794">Source</a><a href="#associatedtype.Error" class="anchor">§</a><h4 class="code-header">type <a href="https://doc.rust-lang.org/1.84.0/core/convert/trait.TryInto.html#associatedtype.Error" class="associatedtype">Error</a> = <U as <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.84.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a></h4></section></summary><div class='docblock'>The type returned in the event of a conversion error.</div></details><details class="toggle method-toggle" open><summary><section id="method.try_into" class="method trait-impl"><a class="src rightside" href="https://doc.rust-lang.org/1.84.0/src/core/convert/mod.rs.html#797">Source</a><a href="#method.try_into" class="anchor">§</a><h4 class="code-header">fn <a href="https://doc.rust-lang.org/1.84.0/core/convert/trait.TryInto.html#tymethod.try_into" class="fn">try_into</a>(self) -> <a class="enum" href="https://doc.rust-lang.org/1.84.0/core/result/enum.Result.html" title="enum core::result::Result">Result</a><U, <U as <a class="trait" href="https://doc.rust-lang.org/1.84.0/core/convert/trait.TryFrom.html" title="trait core::convert::TryFrom">TryFrom</a><T>>::<a class="associatedtype" href="https://doc.rust-lang.org/1.84.0/core/convert/trait.TryFrom.html#associatedtype.Error" title="type core::convert::TryFrom::Error">Error</a>></h4></section></summary><div class='docblock'>Performs the conversion.</div></details></div></details></div></section></div></main></body></html> |