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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="Inspects the current call-stack, passing all active frames into the closure provided to calculate a stack trace."><title>trace in backtrace - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-ac92e1bbe349e143.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="backtrace" data-themes="" data-resource-suffix="" data-rustdoc-version="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="sidebar-items.js"></script><script defer src="../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-feafe1bb7466e4bd.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc fn"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle">☰</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../backtrace/index.html">backtrace</a><span class="version">0.3.69</span></h2></div><div class="sidebar-elems"></div></nav><div class="sidebar-resizer"></div>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../backtrace/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Function <a href="index.html">backtrace</a>::<wbr><a class="fn" href="#">trace</a><button id="copy-path" title="Copy item path to clipboard"><img src="../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../src/backtrace/backtrace/mod.rs.html#51-54">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</span>]</button></span></div><pre class="rust item-decl"><code>pub fn trace<F: <a class="trait" href="https://doc.rust-lang.org/1.76.0/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(&<a class="struct" href="struct.Frame.html" title="struct backtrace::Frame">Frame</a>) -> <a class="primitive" href="https://doc.rust-lang.org/1.76.0/std/primitive.bool.html">bool</a>>(cb: F)</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Inspects the current call-stack, passing all active frames into the closure
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provided to calculate a stack trace.</p>
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<p>This function is the workhorse of this library in calculating the stack
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traces for a program. The given closure <code>cb</code> is yielded instances of a
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<code>Frame</code> which represent information about that call frame on the stack. The
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closure is yielded frames in a top-down fashion (most recently called
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functions first).</p>
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<p>The closure’s return value is an indication of whether the backtrace should
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continue. A return value of <code>false</code> will terminate the backtrace and return
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immediately.</p>
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<p>Once a <code>Frame</code> is acquired you will likely want to call <code>backtrace::resolve</code>
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to convert the <code>ip</code> (instruction pointer) or symbol address to a <code>Symbol</code>
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through which the name and/or filename/line number can be learned.</p>
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<p>Note that this is a relatively low-level function and if you’d like to, for
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example, capture a backtrace to be inspected later, then the <code>Backtrace</code>
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type may be more appropriate.</p>
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<h2 id="required-features"><a href="#required-features">Required features</a></h2>
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<p>This function requires the <code>std</code> feature of the <code>backtrace</code> crate to be
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enabled, and the <code>std</code> feature is enabled by default.</p>
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<h2 id="panics"><a href="#panics">Panics</a></h2>
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<p>This function strives to never panic, but if the <code>cb</code> provided panics then
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some platforms will force a double panic to abort the process. Some
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platforms use a C library which internally uses callbacks which cannot be
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unwound through, so panicking from <code>cb</code> may trigger a process abort.</p>
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<h2 id="example"><a href="#example">Example</a></h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">extern crate </span>backtrace;
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<span class="kw">fn </span>main() {
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backtrace::trace(|frame| {
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<span class="comment">// ...
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</span><span class="bool-val">true </span><span class="comment">// continue the backtrace
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</span>});
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}</code></pre></div>
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</div></details></section></div></main></body></html>
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