Sophie: php-manual-ro-0:20051028-1 noarch

php-manual-ro-20051028-1.noarch.rpm

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>shmop_open</H1
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NAME="AEN103668"
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><P
>    (PHP 4 &#62;= 4.0.4, PHP 5)</P
>shmop_open&nbsp;--&nbsp;Create or open shared memory block</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN103671"
></A
><H2
>Description</H2
>int <B
CLASS="methodname"
>shmop_open</B
> ( int key, string flags, int mode, int size)<BR
></BR
><P
>&#13;     <B
CLASS="function"
>shmop_open()</B
> can create or open a shared memory block.
    </P
><P
>&#13;     <B
CLASS="function"
>shmop_open()</B
> takes 4 parameters: key, which is the
     system's id for the shared memory block, this parameter can be passed
     as a decimal or hex. The second parameter are the flags that you can use:
     <P
></P
><UL
><LI
><P
>&#13;        "a" for access (sets SHM_RDONLY for shmat)
        use this flag when you need to open an existing shared memory 
        segment for read only
       </P
></LI
><LI
><P
>&#13;        "c" for create (sets IPC_CREATE)
        use this flag when you need to create a new shared memory segment 
        or if a segment with the same key exists, try to open it for read 
        and write
       </P
></LI
><LI
><P
>&#13;        "w" for read &#38; write access
        use this flag when you need to read and write to a shared memory 
        segment, use this flag in most cases.
       </P
></LI
><LI
><P
>&#13;        "n" create a new memory segment (sets IPC_CREATE|IPC_EXCL)
        use this flag when you want to create a new shared memory segment 
        but if one already exists with the same flag, fail. This is useful
        for security purposes, using this you can prevent race condition 
        exploits.
       </P
></LI
></UL
>
     The third parameter is the mode, which are the permissions that you
     wish to assign to your memory segment, those are the same as permission
     for a file. Permissions need to be passed in octal form ex. 0644.
     The last parameter is size of the shared memory block you wish to create
     in bytes.
     <DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Not&#227;: </B
>
      Note: the 3rd and 4th should be entered as 0 if you are opening an
      existing memory segment. On success <B
CLASS="function"
>shmop_open()</B
> will
      return an id that you can use to access the shared memory segment
      you've created.
     </P
></BLOCKQUOTE
></DIV
>
    </P
><P
>&#13;     <TABLE
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><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN103705"
></A
><P
><B
>Exemplu 1. Create a new shared memory block</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br />$shm_key </font><font color="#007700">= </font><font color="#0000BB">ftok</font><font color="#007700">(</font><font color="#0000BB">__FILE__</font><font color="#007700">, </font><font color="#DD0000">'t'</font><font color="#007700">);<br /></font><font color="#0000BB">$shm_id </font><font color="#007700">= </font><font color="#0000BB">shmop_open</font><font color="#007700">(</font><font color="#0000BB">$shm_key</font><font color="#007700">, </font><font color="#DD0000">"c"</font><font color="#007700">, </font><font color="#0000BB">0644</font><font color="#007700">, </font><font color="#0000BB">100</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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>
    </P
><P
>&#13;     This example opened a shared memory block with a system id returned by 
     <A
HREF="function.ftok.html"
><B
CLASS="function"
>ftok()</B
></A
>.
    </P
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