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><H1
><A
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></A
>pcntl_signal</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN170047"
></A
><P
> (PHP 4 >= 4.1.0, PHP 5)</P
>pcntl_signal -- Installs a signal handler</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN170050"
></A
><H2
>说明</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="AEN170067"
></A
><H2
>参数</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
>注意: </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="AEN170091"
></A
><H2
>返回值</H2
><P
> 如果成功则返回 <TT
CLASS="constant"
><B
>TRUE</B
></TT
>，失败则返回 <TT
CLASS="constant"
><B
>FALSE</B
></TT
>。
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN170096"
></A
><H2
>更新日志</H2
><P
> <DIV
CLASS="informaltable"
><P
></P
><A
NAME="AEN170099"
></A
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TH
>版本</TH
><TH
>说明</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="AEN170118"
></A
><H2
>范例</H2
><P
> <TABLE
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><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN170121"
></A
><P
><B
>例 1. <B
CLASS="function"
>pcntl_signal()</B
> example</B
></P
><TABLE
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><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
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></TD
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>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN170125"
></A
><H2
>参见</H2
><P
> <P
></P
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><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
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><P
></P
>
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