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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><tt> 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(); + }</tt></pre> +</div></div> +<div class="paragraph"><p>Handlers are given the typdef 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> +<div id="footer"> +<div id="footer-text"> +Last updated 2010-11-18 00:51:23 UTC +</div> +</div> +</body> +</html> 