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documented dio-functions
still open: dio_fnctl (cmd params) git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@66932 c90b9560-bf6c-de11-be94-00142212c4b1
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Georg Richter
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1 changed files with 126 additions and 21 deletions
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<?xml version="1.0" encoding="iso-8859-1"?>
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<!-- $Revision: 1.4 $ -->
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<!-- $Revision: 1.5 $ -->
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<reference id="ref.dio">
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<title>Direct IO functions</title>
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<titleabbrev>DIO functions</titleabbrev>
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<partintro>
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<para>
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Undocumented
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</para>
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<section id="dio.intro">
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<title>Direct I/O Functions</title>
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<para>
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PHP supports the direct io functions as described in the Posix
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Standard (Section 6) for performing I/O functions at a lower
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level than the C-Language stream I/O functions (fopen, fread,..).
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</para>
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</section>
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<section id="dio.installation">
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<title>Installation</title>
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<para>
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To get these functions to work, you have to configure PHP with
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<option role="configure">--enable-dio</option>.
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</para>
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</section>
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</partintro>
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<refentry id="function.dio-open">
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<refnamediv>
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<refname>dio_open</refname>
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<refpurpose>Open a new filename with specified permissions of flags and creation permissions of mode </refpurpose>
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<refpurpose>Opens a new filename with specified permissions of flags and creation permissions of mode </refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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@ -29,7 +40,32 @@
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</funcprototype>
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</funcsynopsis>
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<para>
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&warn.undocumented.func;
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<function>dio_open</function> opens a file and returns a new
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file descriptor for it, or -1 if any error occured.
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If <parameter>flags</parameter> is O_CREAT, optional third parameter
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<parameter>mode</parameter> will set the mode of the file
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(creation permissions).
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The <parameter>flags</parameter> parameter can be one of the
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following options:
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<itemizedlist>
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<listitem><para>O_RDONLY - opens the file for read access</para></listitem>
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<listitem><para>O_WRONLY - opens the file for write access</para></listitem>
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<listitem><para>O_RDWR - opens the file for both reading and
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writing</para></listitem>
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</itemizedlist>
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The <parameter>flags</parameter> parameter can also include any
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combination of the following flags:
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<itemizedlist>
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<listitem><para>O_CREAT - creates the file, if it doesn't
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already exist</para></listitem>
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<listitem><para>O_EXCL - if both, O_CREAT and O_EXCL are set,
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<function>dio_open</function> fails, if file already exists.</para></listitem>
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<listitem><para>O_TRUNC - if file exists, and its opened
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for write access, file will be truncated to zero length.</para></listitem>
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<listitem><para>O_APPEND - write operations write data at the
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end of file</para></listitem>
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<listitem><para>O_NONBLOCK - sets non blocking mode</para></listitem>
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</itemizedlist>
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</para>
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</refsect1>
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</refentry>
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@ -37,7 +73,7 @@
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<refentry id="function.dio-read">
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<refnamediv>
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<refname>dio_read</refname>
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<refpurpose>Read n bytes from fd and return them, if n is not specified, read 1k </refpurpose>
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<refpurpose>Reads n bytes from fd and returns them, if n is not specified, reads 1k block</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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@ -51,7 +87,11 @@
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</funcprototype>
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</funcsynopsis>
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<para>
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&warn.undocumented.func;
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The function <function>dio_read</function> reads and returns
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<parameter>n</parameter> bytes from file with descriptor
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<parameter>resource</parameter>. If <parameter>n</parameter> is
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not specified, <function>dio_read</function> reads 1K sized block and
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returns them.
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</para>
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</refsect1>
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</refentry>
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@ -59,7 +99,7 @@
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<refentry id="function.dio-write">
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<refnamediv>
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<refname>dio_write</refname>
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<refpurpose>Write data to fd with optional truncation at length </refpurpose>
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<refpurpose>Writes data to fd with optional truncation at length </refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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@ -74,7 +114,14 @@
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</funcprototype>
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</funcsynopsis>
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<para>
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&warn.undocumented.func;
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The function <function>dio_write</function>
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writes up to <parameter>len</parameter> bytes from
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<parameter>data</parameter> to file <parameter>fd</parameter>. If
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<parameter>len</parameter> is not specified,
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<function>dio_write</function> writes all
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<parameter>data</parameter> to the specified
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file. <function>dio_write</function> returns the number of bytes
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written to <parameter>fd</parameter>.
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</para>
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</refsect1>
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</refentry>
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@ -82,7 +129,7 @@
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<refentry id="function.dio-truncate">
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<refnamediv>
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<refname>dio_truncate</refname>
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<refpurpose>Truncate file descriptor fd to offset bytes </refpurpose>
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<refpurpose>Truncates file descriptor fd to offset bytes </refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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@ -94,7 +141,14 @@
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</funcprototype>
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</funcsynopsis>
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<para>
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&warn.undocumented.func;
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Function <function>dio_truncate</function> causes the file
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referenced by <parameter>fd</parameter> to be truncated to at
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most <parameter>offset</parameter> bytes in size. If the
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file previously was larger than this size, the extra data
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is lost. If the file previously was shorter, it is
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unspecified whether the file is left unchanged or is
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extended. In the latter case the extended part reads as
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zero bytes. Returns 0 on success, otherwise -1
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</para>
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</refsect1>
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</refentry>
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@ -102,7 +156,7 @@
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<refentry id="function.dio-stat">
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<refnamediv>
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<refname>dio_stat</refname>
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<refpurpose>Get stat information about the file descriptor fd </refpurpose>
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<refpurpose>Gets stat information about the file descriptor fd </refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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@ -113,7 +167,28 @@
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</funcprototype>
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</funcsynopsis>
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<para>
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&warn.undocumented.func;
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Function <function>fstat</function> returns information about
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the file with file descriptor
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<parameter>fd</parameter>. <function>dio_stat</function> returns
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an associative array with the following keys:
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<itemizedlist>
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<listitem><para>"device" - device</para></listitem>
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<listitem><para>"inode" - inode</para></listitem>
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<listitem><para>"mode" - mode</para></listitem>
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<listitem><para>"nlink" - number of hard
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links</para></listitem>
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<listitem><para>"uid" - user id</para></listitem>
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<listitem><para>"gid" - group id</para></listitem>
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<listitem><para>"device_type" - device type (if inode device)</para></listitem>
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<listitem><para>"size" - total size in bytes</para></listitem>
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<listitem><para>"blocksize" - blocksize</para></listitem>
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<listitem><para>"blocks" - number of blocks
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allocated</para></listitem>
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<listitem><para>"atime" - time of last access</para></listitem>
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<listitem><para>"mtime" - time of last modification</para></listitem>
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<listitem><para>"ctime" - time of last change</para></listitem>
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</itemizedlist>
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On error <function>dio_stat</function> returns NULL.
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</para>
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</refsect1>
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</refentry>
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@ -121,7 +196,7 @@
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<refentry id="function.dio-seek">
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<refnamediv>
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<refname>dio_seek</refname>
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<refpurpose>Seek to pos on fd from whence </refpurpose>
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<refpurpose>Seeks to pos on fd from whence </refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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@ -134,7 +209,26 @@
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</funcprototype>
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</funcsynopsis>
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<para>
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&warn.undocumented.func;
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The function <function>dio_seek</function> is used to change the
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file position of the file with descriptor
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<parameter>resource</parameter>.
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The parameter <parameter>whence</parameter> specifies how the
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position <parameter>pos</parameter> should be interpreted:
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<itemizedlist>
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<listitem><para>SEEK_SET - specifies that
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<parameter>pos</parameter> is specified from the beginning of
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the file</para></listitem>
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<listitem><para>SEEK_CUR - Specifies that
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<parameter>pos</parameter> is a count of characters from the
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current file position. This count may be positive or negative</para></listitem>
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<listitem><para>SEEK_END - Specifies that
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<parameter>pos</parameter> is a count of characters from the
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end of the file. A negative count specifies a position within
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the current extent of the file; a positive count specifies a
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position past the current end. If you set the position past the
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current end, and actually write data, you will extend the file
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with zeros up to that position</para></listitem>
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</itemizedlist>
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</para>
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</refsect1>
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</refentry>
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@ -157,7 +251,17 @@
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</funcprototype>
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</funcsynopsis>
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<para>
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&warn.undocumented.func;
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The <function>dio_fcntl</function> function performs the
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operation specified by <parameter>cmd</parameter> on the file
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descriptor <parameter>fd</parameter>. Some commands require
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additional arguments <parameter>args</parameter> to be supplied.
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</para>
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<para>
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<parameter>cmd</parameter> can be one of the following
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operations:
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</para>
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<para>
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cmd parameters still undocumented.
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</para>
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</refsect1>
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</refentry>
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@ -165,7 +269,7 @@
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<refentry id="function.dio-close">
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<refnamediv>
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<refname>dio_close</refname>
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<refpurpose>Close the file descriptor given by fd </refpurpose>
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<refpurpose>Closes the file descriptor given by fd </refpurpose>
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</refnamediv>
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<refsect1>
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<title>Description</title>
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</funcprototype>
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</funcsynopsis>
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<para>
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&warn.undocumented.func;
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The function <function>dio_close</function> closes the
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filedescriptor <parameter>resource</parameter>.
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</para>
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</refsect1>
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</refentry>
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