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>pcntl_signal</H1
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><P
> (PHP 4 >= 4.1.0)</P
>pcntl_signal -- Installs a signal handler</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN65317"
></A
><H2
>Description</H2
>bool <B
CLASS="methodname"
>pcntl_signal</B
> ( int signo, mixed handle [, bool restart_syscalls])<BR
></BR
><P
> The <B
CLASS="function"
>pcntl_signal()</B
> function installs a new
signal handler for the signal indicated by
<TT
CLASS="parameter"
><I
>signo</I
></TT
>. The signal handler is set to
<TT
CLASS="parameter"
><I
>handler</I
></TT
> which may be the name of a user
created function, or either of the two global constants SIG_IGN
or SIG_DFL. The optional <TT
CLASS="parameter"
><I
>restart_syscalls</I
></TT
>
specifies whether system call restarting should be used when this
signal arrives and defaults to <TT
CLASS="constant"
><B
>TRUE</B
></TT
>.
</P
><P
> Devuelve <TT
CLASS="constant"
><B
>TRUE</B
></TT
> si todo fue bien, <TT
CLASS="constant"
><B
>FALSE</B
></TT
> en caso de fallo.
</P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Nota: </B
>
The optional <TT
CLASS="parameter"
><I
>restart_syscalls</I
></TT
> parameter became
available in PHP 4.3.0.
</P
></BLOCKQUOTE
></DIV
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Nota: </B
>
The ability to use an object method as a callback became available in
PHP 4.3.0. 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
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><P
><B
>Ejemplo 1. <B
CLASS="function"
>pcntl_signal()</B
> Example</B
></P
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><PRE
CLASS="php"
><?php
// tick use required as of PHP 4.3.0
declare (ticks = 1);
// signal handler function
function sig_handler($signo) {
switch($signo) {
case SIGTERM:
// handle shutdown tasks
exit;
break;
case SIGHUP:
// handle restart tasks
break;
case SIGUSR1:
print "Caught SIGUSR1...\n";
break;
default:
// handle all other signals
}
}
print "Installing signal handler...\n";
// setup signal handlers
pcntl_signal(SIGTERM, "sig_handler");
pcntl_signal(SIGHUP, "sig_handler");
pcntl_signal(SIGUSR1, "sig_handler");
// or use an object, available as of PHP 4.3.0
// pcntl_signal(SIGUSR1, array($obj, "do_something");
print "Generating signal SIGTERM to self...\n";
// send SIGUSR1 to current process id
posix_kill(posix_getpid(), SIGUSR1);
print "Done\n"
?></PRE
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><P
> See also <A
HREF="function.pcntl-fork.html"
><B
CLASS="function"
>pcntl_fork()</B
></A
> and
<A
HREF="function.pcntl-waitpid.html"
><B
CLASS="function"
>pcntl_waitpid()</B
></A
>.
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