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99 lines
3.9 KiB
HTML
99 lines
3.9 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<title>raise (The Red Hat newlib C Library)</title>
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<meta name="description" content="raise (The Red Hat newlib C Library)">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Signals.html#Signals" rel="up" title="Signals">
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<link href="signal.html#signal" rel="next" title="signal">
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</head>
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<body lang="en">
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<a name="raise"></a>
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<div class="header">
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<p>
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Next: <a href="signal.html#signal" accesskey="n" rel="next">signal</a>, Previous: <a href="psignal.html#psignal" accesskey="p" rel="prev">psignal</a>, Up: <a href="Signals.html#Signals" accesskey="u" rel="up">Signals</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="raise_002d_002d_002dsend-a-signal"></a>
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<h3 class="section">7.2 <code>raise</code>—send a signal</h3>
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<a name="index-raise"></a>
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<a name="index-_005fraise_005fr"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <signal.h>
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int raise(int <var>sig</var>);
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int _raise_r(void *<var>reent</var>, int <var>sig</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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Send the signal <var>sig</var> (one of the macros from ‘<code>sys/signal.h</code>’).
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This interrupts your program’s normal flow of execution, and allows a signal
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handler (if you’ve defined one, using <code>signal</code>) to take control.
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</p>
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<p>The alternate function <code>_raise_r</code> is a reentrant version. The extra
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argument <var>reent</var> is a pointer to a reentrancy structure.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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The result is <code>0</code> if <var>sig</var> was successfully raised, <code>1</code>
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otherwise. However, the return value (since it depends on the normal
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flow of execution) may not be visible, unless the signal handler for
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<var>sig</var> terminates with a <code>return</code> or unless <code>SIG_IGN</code> is in
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effect for this signal.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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ANSI C requires <code>raise</code>, but allows the full set of signal numbers
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to vary from one implementation to another.
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</p>
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<p>Required OS subroutines: <code>getpid</code>, <code>kill</code>.
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</p>
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<br>
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</body>
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</html>
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