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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>proc_dostring</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Linux Filesystems API" /><link rel="up" href="ch02.html#sysctl_interface" title="sysctl interface" /><link rel="prev" href="re135.html" title="unregister_sysctl_table" /><link rel="next" href="re137.html" title="proc_dointvec" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>proc_dostring</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re135.html">Prev</a> </td><th width="60%" align="center">sysctl interface</th><td width="20%" align="right"> <a accesskey="n" href="re137.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="proc_dostring"><a id="API-proc-dostring"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>proc_dostring —
read a string sysctl
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">int <b class="fsfunc">proc_dostring </b>(</code></td><td>struct ctl_table * <var class="pdparam">table</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">write</var>, </td></tr><tr><td> </td><td>void __user * <var class="pdparam">buffer</var>, </td></tr><tr><td> </td><td>size_t * <var class="pdparam">lenp</var>, </td></tr><tr><td> </td><td>loff_t * <var class="pdparam">ppos</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id3117287"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>table</code></em></span></dt><dd><p>
the sysctl table
</p></dd><dt><span class="term"><em class="parameter"><code>write</code></em></span></dt><dd><p>
<code class="constant">TRUE</code> if this is a write to the sysctl file
</p></dd><dt><span class="term"><em class="parameter"><code>buffer</code></em></span></dt><dd><p>
the user buffer
</p></dd><dt><span class="term"><em class="parameter"><code>lenp</code></em></span></dt><dd><p>
the size of the user buffer
</p></dd><dt><span class="term"><em class="parameter"><code>ppos</code></em></span></dt><dd><p>
file position
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id3117385"></a><h2>Description</h2><p>
Reads/writes a string from/to the user buffer. If the kernel
buffer provided is not large enough to hold the string, the
string is truncated. The copied string is <code class="constant">NULL-terminated</code>.
If the string is being read by the user process, it is copied
and a newline '\n' is added. It is truncated if the buffer is
not large enough.
</p><p>
Returns 0 on success.
</p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re135.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch02.html#sysctl_interface">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="re137.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>unregister_sysctl_table</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span>proc_dointvec</span></td></tr></table></div></body></html>
