qmk_firmware/assets/features_os_detection.md.drYM7kiJ.js

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const _hoisted_1 = /* @__PURE__ */ createStaticVNode('<h1 id="os-detection" tabindex="-1">OS Detection <a class="header-anchor" href="#os-detection" aria-label="Permalink to &quot;OS Detection&quot;">​</a></h1><p>This feature makes a best guess at the host OS based on OS specific behavior during USB setup. It may not always get the correct OS, and shouldn&#39;t be relied on as for critical functionality.</p><p>Using it you can have OS specific key mappings or combos which work differently on different devices.</p><p>It is available for keyboards which use ChibiOS, LUFA and V-USB.</p><h2 id="usage" tabindex="-1">Usage <a class="header-anchor" href="#usage" aria-label="Permalink to &quot;Usage&quot;">​</a></h2><p>In your <code>rules.mk</code> add:</p><div class="language-make vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">make</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">OS_DETECTION_ENABLE = yes</span></span></code></pre></div><p>It will automatically include the required headers file. It declares <code>os_variant_t detected_host_os(void);</code> which you can call to get detected OS.</p><p>It returns one of the following values:</p><div class="language-c vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">enum</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>\n<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">    OS_UNSURE,</span></span>\n<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">    OS_LINUX,</span></span>\n<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">    OS_WINDOWS,</span></span>\n<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">    OS_MACOS,</span></span>\n<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">    OS_IOS,</span></span>\n<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">} </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">os_variant_t</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span></code></pre></div><div class="tip custom-block"><p class="custom-block-title">TIP</p><p>Note that it takes some time after firmware is booted to detect the OS.</p></div><p>This time is quite short, probably hundreds of milliseconds, but this data may be not ready in keyboard and layout setup functions which run very early during firmware startup.</p><h2 id="callbacks" tabindex="-1">Callbacks <a class="header-anchor" href="#callbacks" aria-label="Permalink to &quot;Callbacks {#callbacks}&quot;">​</a></h2><p>If you want to perform custom actions when the OS is detected, then you can use the <code>process_detected_host_os_kb</code> function on the keyboard level source file, or <code>process_detected_host_os_user</code> function in the user <code>keymap.c</code>.</p><div class="language-c vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">c</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">bool</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> process_detected_host_os_kb</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">os_variant_t</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;"> detected_os</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span>\n<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">    if</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> (</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">!</span><span st
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