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40 lines
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2.5 KiB
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<title>Process.poll — Ludic</title>
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<meta name="description" content="-1 while running, else the exit code.">
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<header class="nav"><div class="wrap nav-in"><a class="brand" href="index.html"><span class="logo">L</span> Ludic</a><button class="nav-toggle" aria-label="Toggle menu" aria-expanded="false">☰</button><nav class="nav-links"><a href="index.html">Home</a><a href="api.html">API Reference</a><a class="nav-cta" href="https://git.workshopsoft.io/workshopsoft/ludic">Source ↗</a></nav></div></header>
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<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="ns-process.html">Process</a> <span>›</span> <span class="here">Process.poll</span></div>
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<div class="item-head">
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<span class="kind-badge kind-method">method</span>
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<h1 id="top">Process.poll</h1>
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</div>
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<code class="sig">Process.poll(handle) -> int</code>
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<div class="desc"><p>Returns <code>-1</code> while the child is still running and its exit code once it has ended; it never waits. The code is kept, so asking again gives the same answer until <a href="process-free.html"><code>Process.free</code></a>.</p><p>A child ended by a signal (macOS) answers <code>128</code> plus the signal number, as a shell reports it — <code>137</code> after <a href="process-kill.html"><code>Process.kill</code></a>, on both platforms. On Windows the code is the child's DWORD exit code as an <code>int</code>, so a crash such as <code>0xC0000005</code> arrives as a negative number (test for <code>!= 0</code>, not <code>> 0</code>); a code of <code>0xFFFFFFFF</code> is reported as <code>255</code> so that <code>-1</code> always means "still running". A handle that is not one answers <code>255</code>.</p></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program Demo {
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var game: int = -1
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handler Watch phase Update {
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if game >= 0 {
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let code = Process.poll(handle: game)
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if code >= 0 or code < -1 {
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if code != 0 { print("the game crashed") }
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Process.free(handle: game)
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game = -1
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}
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}
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}
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}</pre></div>
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