<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >pcntl_signal</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK REL="HOME" TITLE="Manual do PHP" HREF="index.html"><LINK REL="UP" TITLE="Process Control Functions" HREF="ref.pcntl.html"><LINK REL="PREVIOUS" TITLE="pcntl_setpriority" HREF="function.pcntl-setpriority.html"><LINK REL="NEXT" TITLE="pcntl_wait" HREF="function.pcntl-wait.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=UTF-8"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >Manual do PHP</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.pcntl-setpriority.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.pcntl-wait.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.pcntl-signal" ></A >pcntl_signal</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN165127" ></A ><P > (PHP 4 >= 4.1.0, PHP 5)</P >pcntl_signal -- Installs a signal handler</DIV ><DIV CLASS="refsect1" ><A NAME="AEN165130" ></A ><H2 >Descrição</H2 >bool <B CLASS="methodname" >pcntl_signal</B > ( int signo, callback handler [, bool restart_syscalls] )<BR ></BR ><P > The <B CLASS="function" >pcntl_signal()</B > function installs a new signal handler for the signal indicated by <CODE CLASS="parameter" >signo</CODE >. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN165147" ></A ><H2 >Parâmetros</H2 ><P > <P ></P ><DIV CLASS="variablelist" ><DL ><DT ><CODE CLASS="parameter" >signo</CODE ></DT ><DD ><P > The signal number. </P ></DD ><DT ><CODE CLASS="parameter" >handler</CODE ></DT ><DD ><P > The signal handler which may be the name of a user created function, or method, or either of the two global constants <TT CLASS="constant" ><B >SIG_IGN</B ></TT > or <TT CLASS="constant" ><B >SIG_DFL</B ></TT >. </P ><DIV CLASS="note" ><BLOCKQUOTE CLASS="note" ><P ><B >Nota: </B > Note that when you set a handler to an object method, that object's reference count is increased which makes it persist until you either change the handler to something else, or your script ends. </P ></BLOCKQUOTE ></DIV ></DD ><DT ><CODE CLASS="parameter" >restart_syscalls</CODE ></DT ><DD ><P > Specifies whether system call restarting should be used when this signal arrives and defaults to <TT CLASS="constant" ><B >TRUE</B ></TT >. </P ></DD ></DL ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN165171" ></A ><H2 >Valores de retornado</H2 ><P > Retorna <TT CLASS="constant" ><B >TRUE</B ></TT > em caso de sucesso ou <TT CLASS="constant" ><B >FALSE</B ></TT > em falhas. </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN165176" ></A ><H2 >Histórico</H2 ><P > <DIV CLASS="informaltable" ><P ></P ><A NAME="AEN165179" ></A ><TABLE BORDER="1" CLASS="CALSTABLE" ><COL><COL><THEAD ><TR ><TH >Versão</TH ><TH >Descrição</TH ></TR ></THEAD ><TBODY ><TR ><TD >4.3.0</TD ><TD > The <CODE CLASS="parameter" >restart_syscalls</CODE > parameter was added. </TD ></TR ><TR ><TD >4.3.0</TD ><TD > The ability to use an object method as a callback became available. </TD ></TR ><TR ><TD >4.3.0</TD ><TD > As of PHP 4.3.0 PCNTL uses ticks as the signal handle callback mechanism, which is much faster than the previous mechanism. This change follows the same semantics as using "<A HREF="control-structures.declare.html#control-structures.declare.ticks" >user ticks</A >". You must use the <A HREF="control-structures.declare.html" >declare()</A > statement to specify the locations in your program where callbacks are allowed to occur for the signal handler to function properly (as used in the above example). </TD ></TR ></TBODY ></TABLE ><P ></P ></DIV > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN165198" ></A ><H2 >Exemplos</H2 ><P > <TABLE WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" CLASS="EXAMPLE" ><TR ><TD ><DIV CLASS="example" ><A NAME="AEN165201" ></A ><P ><B >Exemplo 1. <B CLASS="function" >pcntl_signal()</B > example</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" CELLPADDING="5" ><TR ><TD ><code><font color="#000000"> <font color="#0000BB"><?php<br /></font><font color="#FF8000">// tick use required as of PHP 4.3.0<br /></font><font color="#007700">declare(</font><font color="#0000BB">ticks </font><font color="#007700">= </font><font color="#0000BB">1</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// signal handler function<br /></font><font color="#007700">function </font><font color="#0000BB">sig_handler</font><font color="#007700">(</font><font color="#0000BB">$signo</font><font color="#007700">)<br />{<br /><br /> switch (</font><font color="#0000BB">$signo</font><font color="#007700">) {<br /> case </font><font color="#0000BB">SIGTERM</font><font color="#007700">:<br /> </font><font color="#FF8000">// handle shutdown tasks<br /> </font><font color="#007700">exit;<br /> break;<br /> case </font><font color="#0000BB">SIGHUP</font><font color="#007700">:<br /> </font><font color="#FF8000">// handle restart tasks<br /> </font><font color="#007700">break;<br /> case </font><font color="#0000BB">SIGUSR1</font><font color="#007700">:<br /> echo </font><font color="#DD0000">"Caught SIGUSR1...\n"</font><font color="#007700">;<br /> break;<br /> default:<br /> </font><font color="#FF8000">// handle all other signals<br /> </font><font color="#007700">}<br /><br />}<br /><br />echo </font><font color="#DD0000">"Installing signal handler...\n"</font><font color="#007700">;<br /><br /></font><font color="#FF8000">// setup signal handlers<br /></font><font color="#0000BB">pcntl_signal</font><font color="#007700">(</font><font color="#0000BB">SIGTERM</font><font color="#007700">, </font><font color="#DD0000">"sig_handler"</font><font color="#007700">);<br /></font><font color="#0000BB">pcntl_signal</font><font color="#007700">(</font><font color="#0000BB">SIGHUP</font><font color="#007700">, </font><font color="#DD0000">"sig_handler"</font><font color="#007700">);<br /></font><font color="#0000BB">pcntl_signal</font><font color="#007700">(</font><font color="#0000BB">SIGUSR1</font><font color="#007700">, </font><font color="#DD0000">"sig_handler"</font><font color="#007700">);<br /><br /></font><font color="#FF8000">// or use an object, available as of PHP 4.3.0<br />// pcntl_signal(SIGUSR1, array($obj, "do_something");<br /><br /></font><font color="#007700">echo</font><font color="#DD0000">"Generating signal SIGTERM to self...\n"</font><font color="#007700">;<br /><br /></font><font color="#FF8000">// send SIGUSR1 to current process id<br /></font><font color="#0000BB">posix_kill</font><font color="#007700">(</font><font color="#0000BB">posix_getpid</font><font color="#007700">(), </font><font color="#0000BB">SIGUSR1</font><font color="#007700">);<br /><br />echo </font><font color="#DD0000">"Done\n"<br /><br /></font><font color="#0000BB">?></font> </font> </code></TD ></TR ></TABLE ></DIV ></TD ></TR ></TABLE > </P ></DIV ><DIV CLASS="refsect1" ><A NAME="AEN165205" ></A ><H2 >Veja também</H2 ><P > <P ></P ><TABLE BORDER="0" ><TBODY ><TR ><TD ><A HREF="function.pcntl-fork.html" ><B CLASS="function" >pcntl_fork()</B ></A ></TD ></TR ><TR ><TD ><A HREF="function.pcntl-waitpid.html" ><B CLASS="function" >pcntl_waitpid()</B ></A ></TD ></TR ></TBODY ></TABLE ><P ></P > </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.pcntl-setpriority.html" ACCESSKEY="P" >Anterior</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Principal</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.pcntl-wait.html" ACCESSKEY="N" >Próxima</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >pcntl_setpriority</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.pcntl.html" ACCESSKEY="U" >Acima</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >pcntl_wait</TD ></TR ></TABLE ></DIV ></BODY ></HTML >