Sophie: php-manual-en-4.3.0-2mdk noarch

php-manual-en-4.3.0-2mdk.noarch.rpm

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>shmop_open</H1
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><P
>    (PHP 4 &#62;= 4.0.4)</P
>shmop_open&nbsp;--&nbsp;Create or open shared memory block</DIV
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><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
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><B
>Note: </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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><B
>Example 1. Create a new shared memory block</B
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><PRE
CLASS="php"
>&#60;?php
$shm_id = shmop_open(0x0fff, "c", 0644, 100);
?&#62;</PRE
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>
    </P
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>&#13;     This example opened a shared memory block with a system id of 0x0fff.
    </P
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