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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="API documentation for the Rust `trace` fn in crate `backtrace`."><meta name="keywords" content="rust, rustlang, rust-lang, trace"><title>backtrace::trace - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../dark.css"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="shortcut icon" href="../favicon.ico"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc fn"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../backtrace/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class='location'><a href='index.html'>backtrace</a></p><script>window.sidebarCurrent = {name: 'trace', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../src/backtrace/backtrace/mod.rs.html#51-54' title='goto source code'>[src]</a></span><span class='in-band'>Function <a href='index.html'>backtrace</a>::<wbr><a class="fn" href=''>trace</a></span></h1><pre class='rust fn'>pub fn trace<F: <a class="trait" href="https://doc.rust-lang.org/nightly/core/ops/function/trait.FnMut.html" title="trait core::ops::function::FnMut">FnMut</a>(&<a class="struct" href="../backtrace/struct.Frame.html" title="struct backtrace::Frame">Frame</a>) -> <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.bool.html">bool</a>>(cb: F)</pre><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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<h1 id="required-features" class="section-header"><a href="#required-features">Required features</a></h1>
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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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<h1 id="panics" class="section-header"><a href="#panics">Panics</a></h1>
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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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<h1 id="example" class="section-header"><a href="#example">Example</a></h1>
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<div class="example-wrap"><pre class="rust rust-example-rendered">
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<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">backtrace</span>;
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<span class="kw">fn</span> <span class="ident">main</span>() {
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<span class="ident">backtrace</span>::<span class="ident">trace</span>(<span class="op">|</span><span class="ident">frame</span><span class="op">|</span> {
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<span class="comment">// ...</span>
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<span class="bool-val">true</span> <span class="comment">// continue the backtrace</span>
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});
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}</pre></div>
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