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php-manual-zh-5.2.4-1mdv2008.1.noarch.rpm

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><H1
><A
NAME="function.dio-fcntl"
></A
>dio_fcntl</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN36082"
></A
><P
>    (PHP 4 &#62;= 4.2.0, PHP 5 &#60;= 5.0.4)</P
>dio_fcntl&nbsp;--&nbsp;Performs a c library fcntl on fd</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN36085"
></A
><H2
>说明</H2
>mixed <B
CLASS="methodname"
>dio_fcntl</B
> ( resource fd, int cmd [, mixed args] )<BR
></BR
><P
>&#13;   The <B
CLASS="function"
>dio_fcntl()</B
> function performs the
   operation specified by <CODE
CLASS="parameter"
>cmd</CODE
> on the file
   descriptor <CODE
CLASS="parameter"
>fd</CODE
>. Some commands require
   additional arguments <CODE
CLASS="parameter"
>args</CODE
> to be supplied.
  </P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>注意: </B
>本函数未在 Windows 平台下实现。</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN36106"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>fd</CODE
></DT
><DD
><P
>&#13;       The file descriptor returned by <A
HREF="function.dio-open.html"
><B
CLASS="function"
>dio_open()</B
></A
>.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>cmd</CODE
></DT
><DD
><P
>&#13;       Can be one of the following operations:
       <P
></P
><UL
><LI
><P
>&#13;          <TT
CLASS="constant"
><B
>F_SETLK</B
></TT
> - Lock is set or cleared. If the lock
          is held by someone else <B
CLASS="function"
>dio_fcntl()</B
> returns
          -1.
         </P
></LI
><LI
><P
>&#13;          <TT
CLASS="constant"
><B
>F_SETLKW</B
></TT
> - like <TT
CLASS="constant"
><B
>F_SETLK</B
></TT
>,
          but in case the lock is held by someone else, 
          <B
CLASS="function"
>dio_fcntl()</B
> waits until the lock is released.
         </P
></LI
><LI
><P
>&#13;          <TT
CLASS="constant"
><B
>F_GETLK</B
></TT
> - <B
CLASS="function"
>dio_fcntl()</B
> 
          returns an associative array (as described above) if someone else
          prevents lock. If there is no obstruction key "type" will set
          to <TT
CLASS="constant"
><B
>F_UNLCK</B
></TT
>.
         </P
></LI
><LI
><P
>&#13;          <TT
CLASS="constant"
><B
>F_DUPFD</B
></TT
> - finds the lowest numbered available
          file descriptor greater than or equal to <CODE
CLASS="parameter"
>args</CODE
>
          and returns them.
         </P
></LI
><LI
><P
>&#13;          <TT
CLASS="constant"
><B
>F_SETFL</B
></TT
> - Sets the file descriptors flags to 
          the value specified by <CODE
CLASS="parameter"
>args</CODE
>, which can be
          <TT
CLASS="constant"
><B
>O_APPEND</B
></TT
>, <TT
CLASS="constant"
><B
>O_NONBLOCK</B
></TT
> or 
          <TT
CLASS="constant"
><B
>O_ASYNC</B
></TT
>. To use <TT
CLASS="constant"
><B
>O_ASYNC</B
></TT
> 
          you will need to use the <A
HREF="ref.pcntl.html"
>PCNTL</A
> 
          extension.
         </P
></LI
></UL
>
      </P
></DD
><DT
><CODE
CLASS="parameter"
>args</CODE
></DT
><DD
><P
>&#13;       <CODE
CLASS="parameter"
>args</CODE
> is an associative array, when
       <CODE
CLASS="parameter"
>cmd</CODE
> is <TT
CLASS="constant"
><B
>F_SETLK</B
></TT
> or
       <TT
CLASS="constant"
><B
>F_SETLLW</B
></TT
>, with the following keys:
       <P
></P
><UL
><LI
><P
>&#13;          "start" - offset where lock begins
         </P
></LI
><LI
><P
>&#13;          "length" - size of locked area. zero means to end of file
         </P
></LI
><LI
><P
>&#13;          "wenth" - Where l_start is relative to: can be 
          <TT
CLASS="constant"
><B
>SEEK_SET</B
></TT
>,
          <TT
CLASS="constant"
><B
>SEEK_END</B
></TT
> and <TT
CLASS="constant"
><B
>SEEK_CUR</B
></TT
>
         </P
></LI
><LI
><P
>&#13;          "type" - type of lock: can be <TT
CLASS="constant"
><B
>F_RDLCK</B
></TT
> (read
          lock), <TT
CLASS="constant"
><B
>F_WRLCK</B
></TT
> (write lock) or 
          <TT
CLASS="constant"
><B
>F_UNLCK</B
></TT
> (unlock)
         </P
></LI
></UL
>
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN36173"
></A
><H2
>返回值</H2
><P
>&#13;   Returns the result of the C call.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN36176"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN36179"
></A
><P
><B
>例 1. Setting and clearing a lock</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br />$fd </font><font color="#007700">= </font><font color="#0000BB">dio_open</font><font color="#007700">(</font><font color="#DD0000">'/dev/ttyS0'</font><font color="#007700">, </font><font color="#0000BB">O_RDWR</font><font color="#007700">);<br /><br />if (</font><font color="#0000BB">dio_fcntl</font><font color="#007700">(</font><font color="#0000BB">$fd</font><font color="#007700">, </font><font color="#0000BB">F_SETLK</font><font color="#007700">, Array(</font><font color="#DD0000">"type"</font><font color="#007700">=&gt;</font><font color="#0000BB">F_WRLCK</font><font color="#007700">)) == -</font><font color="#0000BB">1</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;</font><font color="#FF8000">// the file descriptor appears locked<br />&nbsp;&nbsp;&nbsp;</font><font color="#007700">echo </font><font color="#DD0000">"The lock can not be cleared. It is held by someone else."</font><font color="#007700">;<br />} else {<br />&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"Lock succesfully set/cleared"</font><font color="#007700">;<br />}<br /><br /></font><font color="#0000BB">dio_close</font><font color="#007700">(</font><font color="#0000BB">$fd</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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