1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>posix_lock_file</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Filesystems API"><link rel="up" href="file_locks.html" title="File Locks"><link rel="prev" href="file_locks.html" title="File Locks"><link rel="next" href="API-posix-lock-inode-wait.html" title="posix_lock_inode_wait"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">posix_lock_file</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="file_locks.html">Prev</a>&#160;</td><th width="60%" align="center">File Locks</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-posix-lock-inode-wait.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-posix-lock-file"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>posix_lock_file &#8212; 
2  Apply a POSIX-style lock to a file
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">int <b class="fsfunc">posix_lock_file </b>(</code></td><td>struct file * <var class="pdparam">filp</var>, </td></tr><tr><td>&#160;</td><td>struct file_lock * <var class="pdparam">fl</var>, </td></tr><tr><td>&#160;</td><td>struct file_lock * <var class="pdparam">conflock</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1101949060"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>filp</code></em></span></dt><dd><p>
4     The file to apply the lock to
5    </p></dd><dt><span class="term"><em class="parameter"><code>fl</code></em></span></dt><dd><p>
6     The lock to be applied
7    </p></dd><dt><span class="term"><em class="parameter"><code>conflock</code></em></span></dt><dd><p>
8     Place to return a copy of the conflicting lock, if found.
9    </p></dd></dl></div></div><div class="refsect1"><a name="idp1101952660"></a><h2>Description</h2><p>
10   Add a POSIX style lock to a file.
11   We merge adjacent &amp; overlapping locks whenever possible.
12   POSIX locks are sorted by owner task, then by starting address
13   </p><p>
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15   Note that if called with an FL_EXISTS argument, the caller may determine
16   whether or not a lock was successfully freed by testing the return
17   value for -ENOENT.
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