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181 lines
6.8 KiB
HTML
181 lines
6.8 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>Opens a file (creating it if necessary) at a lower level than the
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C library input/ouput stream functions allow</title>
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</head>
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<body class="docs"></div>
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<div id="layout">
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<div id="layout-content"><div id="function.dio-open" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">dio_open</h1>
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<p class="verinfo">(PHP 4 >= 4.2.0, PHP 5 < 5.1.0)</p><p class="refpurpose"><span class="refname">dio_open</span> — <span class="dc-title">
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Opens a file (creating it if necessary) at a lower level than the
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C library input/ouput stream functions allow
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</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.dio-open-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>dio_open</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$filename</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$flags</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$mode</code><span class="initializer"> = 0</span></span>
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] ) : <span class="type">resource</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>dio_open()</strong></span> opens a file and returns a new file
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descriptor for it.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.dio-open-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">filename</code></dt>
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<dd>
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<p class="para">
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The pathname of the file to open.
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</p>
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</dd>
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<dt>
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<code class="parameter">flags</code></dt>
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<dd>
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<p class="para">
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The <code class="parameter">flags</code> parameter is a bitwise-ORed
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value comprising flags from the following list. This value
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<em class="emphasis">must</em> include one of
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<strong><code>O_RDONLY</code></strong>, <strong><code>O_WRONLY</code></strong>,
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or <strong><code>O_RDWR</code></strong>. Additionally, it may include
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any combination of the other flags from this list.
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<ul class="itemizedlist">
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<li class="listitem">
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<p class="para">
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<strong><code>O_RDONLY</code></strong> - opens the file for read access.
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</p>
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</li>
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<li class="listitem">
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<p class="para">
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<strong><code>O_WRONLY</code></strong> - opens the file for write access.
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</p>
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</li>
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<li class="listitem">
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<p class="para">
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<strong><code>O_RDWR</code></strong> - opens the file for both reading and
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writing.
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</p>
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</li>
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<li class="listitem">
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<p class="para">
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<strong><code>O_CREAT</code></strong> - creates the file, if it doesn't
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already exist.
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</p>
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</li>
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<li class="listitem">
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<p class="para">
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<strong><code>O_EXCL</code></strong> - if both <strong><code>O_CREAT</code></strong>
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and <strong><code>O_EXCL</code></strong> are set and the file already
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exists, <span class="function"><strong>dio_open()</strong></span> will fail.
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</p>
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</li>
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<li class="listitem">
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<p class="para">
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<strong><code>O_TRUNC</code></strong> - if the file exists and is opened
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for write access, the file will be truncated to zero length.
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</p>
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</li>
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<li class="listitem">
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<p class="para">
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<strong><code>O_APPEND</code></strong> - write operations write data at the
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end of the file.
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</p>
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</li>
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<li class="listitem">
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<p class="para">
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<strong><code>O_NONBLOCK</code></strong> - sets non blocking mode.
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</p>
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</li>
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<li class="listitem">
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<p class="para">
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<strong><code>O_NOCTTY</code></strong> - prevent the OS from
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assigning the opened file as the process's controlling
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terminal when opening a TTY device file.
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</p>
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</li>
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</ul>
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</p>
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</dd>
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<dt>
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<code class="parameter">mode</code></dt>
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<dd>
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<p class="para">
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If <code class="parameter">flags</code> contains
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<strong><code>O_CREAT</code></strong>, <code class="parameter">mode</code> will
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set the permissions of the file (creation
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permissions). <code class="parameter">mode</code> is required for
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correct operation when <strong><code>O_CREAT</code></strong> is
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specified in <code class="parameter">flags</code> and is ignored
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otherwise.
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</p>
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<p class="para">
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The actual permissions assigned to the created file will be
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affected by the process's <em class="emphasis">umask</em> setting as
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per usual.
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.dio-open-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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A file descriptor or <strong><code>FALSE</code></strong> on error.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.dio-open-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-2743">
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<p><strong>Example #1 Opening a file descriptor</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<span style="color: #0000BB"><?php<br /><br />$fd </span><span style="color: #007700">= </span><span style="color: #0000BB">dio_open</span><span style="color: #007700">(</span><span style="color: #DD0000">'/dev/ttyS0'</span><span style="color: #007700">, </span><span style="color: #0000BB">O_RDWR </span><span style="color: #007700">| </span><span style="color: #0000BB">O_NOCTTY </span><span style="color: #007700">| </span><span style="color: #0000BB">O_NONBLOCK</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">dio_close</span><span style="color: #007700">(</span><span style="color: #0000BB">$fd</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
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</span>
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</pre></div>
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</div>
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</div>
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</div>
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<div class="refsect1 seealso" id="refsect1-function.dio-open-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="dio_close.html" class="function" rel="rdfs-seeAlso">dio_close()</a> - Closes the file descriptor given by fd</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |