495 lines
32 KiB
HTML
495 lines
32 KiB
HTML
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<meta name="generator" content="Asciidoctor 1.5.8">
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<title>sigchain API</title>
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@media amzn-kf8{#header,#content,#footnotes,#footer{padding:0}}
|
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</style>
|
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</head>
|
|
<body class="article">
|
|
<div id="header">
|
|
<h1>sigchain API</h1>
|
|
</div>
|
|
<div id="content">
|
|
<div class="paragraph">
|
|
<p>Code often wants to set a signal handler to clean up temporary files or
|
|
other work-in-progress when we die unexpectedly. For multiple pieces of
|
|
code to do this without conflicting, each piece of code must remember
|
|
the old value of the handler and restore it either when:</p>
|
|
</div>
|
|
<div class="olist arabic">
|
|
<ol class="arabic">
|
|
<li>
|
|
<p>The work-in-progress is finished, and the handler is no longer
|
|
necessary. The handler should revert to the original behavior
|
|
(either another handler, SIG_DFL, or SIG_IGN).</p>
|
|
</li>
|
|
<li>
|
|
<p>The signal is received. We should then do our cleanup, then chain
|
|
to the next handler (or die if it is SIG_DFL).</p>
|
|
</li>
|
|
</ol>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Sigchain is a tiny library for keeping a stack of handlers. Your handler
|
|
and installation code should look something like:</p>
|
|
</div>
|
|
<div class="listingblock">
|
|
<div class="content">
|
|
<pre> void clean_foo_on_signal(int sig)
|
|
{
|
|
clean_foo();
|
|
sigchain_pop(sig);
|
|
raise(sig);
|
|
}
|
|
|
|
void other_func()
|
|
{
|
|
sigchain_push_common(clean_foo_on_signal);
|
|
mess_up_foo();
|
|
clean_foo();
|
|
}</pre>
|
|
</div>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>Handlers are given the typedef of sigchain_fun. This is the same type
|
|
that is given to signal() or sigaction(). It is perfectly reasonable to
|
|
push SIG_DFL or SIG_IGN onto the stack.</p>
|
|
</div>
|
|
<div class="paragraph">
|
|
<p>You can sigchain_push and sigchain_pop individual signals. For
|
|
convenience, sigchain_push_common will push the handler onto the stack
|
|
for many common signals.</p>
|
|
</div>
|
|
</div>
|
|
<div id="footer">
|
|
<div id="footer-text">
|
|
Last updated 2019-02-26 19:31:11 UTC
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</div>
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</div>
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</body>
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</html> |