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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<div class="textblock"><code>#include &lt;cuse_lowlevel.h&gt;</code><br />
<code>#include &lt;fuse_opt.h&gt;</code><br />
<code>#include &lt;stddef.h&gt;</code><br />
<code>#include &lt;stdio.h&gt;</code><br />
<code>#include &lt;stdlib.h&gt;</code><br />
<code>#include &lt;string.h&gt;</code><br />
<code>#include &lt;unistd.h&gt;</code><br />
<code>#include &lt;errno.h&gt;</code><br />
<code>#include &quot;<a class="el" href="example_2ioctl_8h_source.html">ioctl.h</a>&quot;</code><br />
</div>
<p><a href="example_2cuse_8c_source.html">Go to the source code of this file.</a></p>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>This example demonstrates how to implement a character device in userspace ("CUSE"). This is only allowed for root. The character device should appear in /dev under the specified name. It can be tested with the cuse_client.c program.</p>
<p>Mount the file system with: </p><pre class="fragment">cuse -f --name=mydevice
</pre><p> You should now have a new /dev/mydevice character device. To "unmount" it, kill the "cuse" process.</p>
<p>To compile this example, run </p><pre class="fragment">gcc -Wall cuse.c `pkg-config fuse3 --cflags --libs` -o cuse
</pre> <h2><a class="anchor" id="autotoc_md3"></a>
Source code</h2>
<div class="fragment"><div class="line"><span class="comment">/*</span></div>
<div class="line"><span class="comment">  CUSE example: Character device in Userspace</span></div>
<div class="line"><span class="comment">  Copyright (C) 2008-2009  SUSE Linux Products GmbH</span></div>
<div class="line"><span class="comment">  Copyright (C) 2008-2009  Tejun Heo &lt;tj@kernel.org&gt;</span></div>
<div class="line"><span class="comment"></span> </div>
<div class="line"><span class="comment">  This program can be distributed under the terms of the GNU GPLv2.</span></div>
<div class="line"><span class="comment">  See the file COPYING.</span></div>
<div class="line"><span class="comment"></span> </div>
<div class="line"><span class="comment">*/</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#define FUSE_USE_VERSION 31</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#include &lt;cuse_lowlevel.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;fuse_opt.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;stddef.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;stdio.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;stdlib.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;string.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;unistd.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;errno.h&gt;</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#include &quot;ioctl.h&quot;</span></div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> *cusexmp_buf;</div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">size_t</span> cusexmp_size;</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *usage =</div>
<div class="line"><span class="stringliteral">&quot;usage: cusexmp [options]\n&quot;</span></div>
<div class="line"><span class="stringliteral">&quot;\n&quot;</span></div>
<div class="line"><span class="stringliteral">&quot;options:\n&quot;</span></div>
<div class="line"><span class="stringliteral">&quot;    --help|-h             print this help message\n&quot;</span></div>
<div class="line"><span class="stringliteral">&quot;    --maj=MAJ|-M MAJ      device major number\n&quot;</span></div>
<div class="line"><span class="stringliteral">&quot;    --min=MIN|-m MIN      device minor number\n&quot;</span></div>
<div class="line"><span class="stringliteral">&quot;    --name=NAME|-n NAME   device name (mandatory)\n&quot;</span></div>
<div class="line"><span class="stringliteral">&quot;    -d   -o debug         enable debug output (implies -f)\n&quot;</span></div>
<div class="line"><span class="stringliteral">&quot;    -f                    foreground operation\n&quot;</span></div>
<div class="line"><span class="stringliteral">&quot;    -s                    disable multi-threaded operation\n&quot;</span></div>
<div class="line"><span class="stringliteral">&quot;\n&quot;</span>;</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> cusexmp_resize(<span class="keywordtype">size_t</span> new_size)</div>
<div class="line">{</div>
<div class="line">        <span class="keywordtype">void</span> *new_buf;</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">if</span> (new_size == cusexmp_size)</div>
<div class="line">                <span class="keywordflow">return</span> 0;</div>
<div class="line"> </div>
<div class="line">        new_buf = realloc(cusexmp_buf, new_size);</div>
<div class="line">        <span class="keywordflow">if</span> (!new_buf &amp;&amp; new_size)</div>
<div class="line">                <span class="keywordflow">return</span> -ENOMEM;</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">if</span> (new_size &gt; cusexmp_size)</div>
<div class="line">                memset(new_buf + cusexmp_size, 0, new_size - cusexmp_size);</div>
<div class="line"> </div>
<div class="line">        cusexmp_buf = new_buf;</div>
<div class="line">        cusexmp_size = new_size;</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> cusexmp_expand(<span class="keywordtype">size_t</span> new_size)</div>
<div class="line">{</div>
<div class="line">        <span class="keywordflow">if</span> (new_size &gt; cusexmp_size)</div>
<div class="line">                <span class="keywordflow">return</span> cusexmp_resize(new_size);</div>
<div class="line">        <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> cusexmp_open(<a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a33e2aa4a8905a05397292ae047cd2257">fuse_req_t</a> req, <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi)</div>
<div class="line">{</div>
<div class="line">        <a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a170f8c6b953d70928e83bcecee43bfdc">fuse_reply_open</a>(req, fi);</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> cusexmp_read(<a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a33e2aa4a8905a05397292ae047cd2257">fuse_req_t</a> req, <span class="keywordtype">size_t</span> size, off_t off,</div>
<div class="line">                         <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi)</div>
<div class="line">{</div>
<div class="line">        (void)fi;</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">if</span> (off &gt;= cusexmp_size)</div>
<div class="line">                off = cusexmp_size;</div>
<div class="line">        <span class="keywordflow">if</span> (size &gt; cusexmp_size - off)</div>
<div class="line">                size = cusexmp_size - off;</div>
<div class="line"> </div>
<div class="line">        <a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a300a88b63ab7c8ca92853a97486448c0">fuse_reply_buf</a>(req, cusexmp_buf + off, size);</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> cusexmp_write(<a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a33e2aa4a8905a05397292ae047cd2257">fuse_req_t</a> req, <span class="keyword">const</span> <span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> size,</div>
<div class="line">                          off_t off, <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi)</div>
<div class="line">{</div>
<div class="line">        (void)fi;</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">if</span> (cusexmp_expand(off + size)) {</div>
<div class="line">                <a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a2553c03f9a63c75e609e67f90a3a5d88">fuse_reply_err</a>(req, ENOMEM);</div>
<div class="line">                <span class="keywordflow">return</span>;</div>
<div class="line">        }</div>
<div class="line"> </div>
<div class="line">        memcpy(cusexmp_buf + off, buf, size);</div>
<div class="line">        <a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#aa3cfa73f61d6ef461ab5a3fbf859eb97">fuse_reply_write</a>(req, size);</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> fioc_do_rw(<a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a33e2aa4a8905a05397292ae047cd2257">fuse_req_t</a> req, <span class="keywordtype">void</span> *addr, <span class="keyword">const</span> <span class="keywordtype">void</span> *in_buf,</div>
<div class="line">                       <span class="keywordtype">size_t</span> in_bufsz, <span class="keywordtype">size_t</span> out_bufsz, <span class="keywordtype">int</span> is_read)</div>
<div class="line">{</div>
<div class="line">        <span class="keyword">const</span> <span class="keyword">struct </span>fioc_rw_arg *arg;</div>
<div class="line">        <span class="keyword">struct </span>iovec in_iov[2], out_iov[3], iov[3];</div>
<div class="line">        <span class="keywordtype">size_t</span> cur_size;</div>
<div class="line"> </div>
<div class="line">        <span class="comment">/* read in arg */</span></div>
<div class="line">        in_iov[0].iov_base = addr;</div>
<div class="line">        in_iov[0].iov_len = <span class="keyword">sizeof</span>(*arg);</div>
<div class="line">        <span class="keywordflow">if</span> (!in_bufsz) {</div>
<div class="line">                <a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a940683d07df12c24f56b4363aed90e4d">fuse_reply_ioctl_retry</a>(req, in_iov, 1, NULL, 0);</div>
<div class="line">                <span class="keywordflow">return</span>;</div>
<div class="line">        }</div>
<div class="line">        arg = in_buf;</div>
<div class="line">        in_buf += <span class="keyword">sizeof</span>(*arg);</div>
<div class="line">        in_bufsz -= <span class="keyword">sizeof</span>(*arg);</div>
<div class="line"> </div>
<div class="line">        <span class="comment">/* prepare size outputs */</span></div>
<div class="line">        out_iov[0].iov_base =</div>
<div class="line">                addr + offsetof(<span class="keyword">struct</span> fioc_rw_arg, prev_size);</div>
<div class="line">        out_iov[0].iov_len = <span class="keyword">sizeof</span>(arg-&gt;prev_size);</div>
<div class="line"> </div>
<div class="line">        out_iov[1].iov_base =</div>
<div class="line">                addr + offsetof(<span class="keyword">struct</span> fioc_rw_arg, new_size);</div>
<div class="line">        out_iov[1].iov_len = <span class="keyword">sizeof</span>(arg-&gt;new_size);</div>
<div class="line"> </div>
<div class="line">        <span class="comment">/* prepare client buf */</span></div>
<div class="line">        <span class="keywordflow">if</span> (is_read) {</div>
<div class="line">                out_iov[2].iov_base = arg-&gt;buf;</div>
<div class="line">                out_iov[2].iov_len = arg-&gt;size;</div>
<div class="line">                <span class="keywordflow">if</span> (!out_bufsz) {</div>
<div class="line">                        <a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a940683d07df12c24f56b4363aed90e4d">fuse_reply_ioctl_retry</a>(req, in_iov, 1, out_iov, 3);</div>
<div class="line">                        <span class="keywordflow">return</span>;</div>
<div class="line">                }</div>
<div class="line">        } <span class="keywordflow">else</span> {</div>
<div class="line">                in_iov[1].iov_base = arg-&gt;buf;</div>
<div class="line">                in_iov[1].iov_len = arg-&gt;size;</div>
<div class="line">                <span class="keywordflow">if</span> (arg-&gt;size &amp;&amp; !in_bufsz) {</div>
<div class="line">                        <a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a940683d07df12c24f56b4363aed90e4d">fuse_reply_ioctl_retry</a>(req, in_iov, 2, out_iov, 2);</div>
<div class="line">                        <span class="keywordflow">return</span>;</div>
<div class="line">                }</div>
<div class="line">        }</div>
<div class="line"> </div>
<div class="line">        <span class="comment">/* we&#39;re all set */</span></div>
<div class="line">        cur_size = cusexmp_size;</div>
<div class="line">        iov[0].iov_base = &amp;cur_size;</div>
<div class="line">        iov[0].iov_len = <span class="keyword">sizeof</span>(cur_size);</div>
<div class="line"> </div>
<div class="line">        iov[1].iov_base = &amp;cusexmp_size;</div>
<div class="line">        iov[1].iov_len = <span class="keyword">sizeof</span>(cusexmp_size);</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">if</span> (is_read) {</div>
<div class="line">                <span class="keywordtype">size_t</span> off = arg-&gt;offset;</div>
<div class="line">                <span class="keywordtype">size_t</span> size = arg-&gt;size;</div>
<div class="line"> </div>
<div class="line">                <span class="keywordflow">if</span> (off &gt;= cusexmp_size)</div>
<div class="line">                        off = cusexmp_size;</div>
<div class="line">                <span class="keywordflow">if</span> (size &gt; cusexmp_size - off)</div>
<div class="line">                        size = cusexmp_size - off;</div>
<div class="line"> </div>
<div class="line">                iov[2].iov_base = cusexmp_buf + off;</div>
<div class="line">                iov[2].iov_len = size;</div>
<div class="line">                <a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a37381eb84c39e5fe3af9f3ef507aeeb7">fuse_reply_ioctl_iov</a>(req, size, iov, 3);</div>
<div class="line">        } <span class="keywordflow">else</span> {</div>
<div class="line">                <span class="keywordflow">if</span> (cusexmp_expand(arg-&gt;offset + in_bufsz)) {</div>
<div class="line">                        <a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a2553c03f9a63c75e609e67f90a3a5d88">fuse_reply_err</a>(req, ENOMEM);</div>
<div class="line">                        <span class="keywordflow">return</span>;</div>
<div class="line">                }</div>
<div class="line"> </div>
<div class="line">                memcpy(cusexmp_buf + arg-&gt;offset, in_buf, in_bufsz);</div>
<div class="line">                <a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a37381eb84c39e5fe3af9f3ef507aeeb7">fuse_reply_ioctl_iov</a>(req, in_bufsz, iov, 2);</div>
<div class="line">        }</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> cusexmp_ioctl(<a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a33e2aa4a8905a05397292ae047cd2257">fuse_req_t</a> req, <span class="keywordtype">int</span> cmd, <span class="keywordtype">void</span> *arg,</div>
<div class="line">                          <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi, <span class="keywordtype">unsigned</span> flags,</div>
<div class="line">                          <span class="keyword">const</span> <span class="keywordtype">void</span> *in_buf, <span class="keywordtype">size_t</span> in_bufsz, <span class="keywordtype">size_t</span> out_bufsz)</div>
<div class="line">{</div>
<div class="line">        <span class="keywordtype">int</span> is_read = 0;</div>
<div class="line"> </div>
<div class="line">        (void)fi;</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">if</span> (flags &amp; <a class="code" href="fuse-3_813_80_2include_2fuse__common_8h.html#ade38f8e8c463cd40af5bfeeebfa99486">FUSE_IOCTL_COMPAT</a>) {</div>
<div class="line">                <a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a2553c03f9a63c75e609e67f90a3a5d88">fuse_reply_err</a>(req, ENOSYS);</div>
<div class="line">                <span class="keywordflow">return</span>;</div>
<div class="line">        }</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">switch</span> (cmd) {</div>
<div class="line">        <span class="keywordflow">case</span> FIOC_GET_SIZE:</div>
<div class="line">                <span class="keywordflow">if</span> (!out_bufsz) {</div>
<div class="line">                        <span class="keyword">struct </span>iovec iov = { arg, <span class="keyword">sizeof</span>(size_t) };</div>
<div class="line"> </div>
<div class="line">                        <a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a940683d07df12c24f56b4363aed90e4d">fuse_reply_ioctl_retry</a>(req, NULL, 0, &amp;iov, 1);</div>
<div class="line">                } <span class="keywordflow">else</span></div>
<div class="line">                        <a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#adf7f34f470c04f276b7091ad3b3dcb31">fuse_reply_ioctl</a>(req, 0, &amp;cusexmp_size,</div>
<div class="line">                                         <span class="keyword">sizeof</span>(cusexmp_size));</div>
<div class="line">                <span class="keywordflow">break</span>;</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">case</span> FIOC_SET_SIZE:</div>
<div class="line">                <span class="keywordflow">if</span> (!in_bufsz) {</div>
<div class="line">                        <span class="keyword">struct </span>iovec iov = { arg, <span class="keyword">sizeof</span>(size_t) };</div>
<div class="line"> </div>
<div class="line">                        <a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a940683d07df12c24f56b4363aed90e4d">fuse_reply_ioctl_retry</a>(req, &amp;iov, 1, NULL, 0);</div>
<div class="line">                } <span class="keywordflow">else</span> {</div>
<div class="line">                        cusexmp_resize(*(<span class="keywordtype">size_t</span> *)in_buf);</div>
<div class="line">                        <a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#adf7f34f470c04f276b7091ad3b3dcb31">fuse_reply_ioctl</a>(req, 0, NULL, 0);</div>
<div class="line">                }</div>
<div class="line">                <span class="keywordflow">break</span>;</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">case</span> FIOC_READ:</div>
<div class="line">                is_read = 1;</div>
<div class="line">                <span class="comment">/* fall through */</span></div>
<div class="line">        <span class="keywordflow">case</span> FIOC_WRITE:</div>
<div class="line">                fioc_do_rw(req, arg, in_buf, in_bufsz, out_bufsz, is_read);</div>
<div class="line">                <span class="keywordflow">break</span>;</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">default</span>:</div>
<div class="line">                <a class="code" href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a2553c03f9a63c75e609e67f90a3a5d88">fuse_reply_err</a>(req, EINVAL);</div>
<div class="line">        }</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keyword">struct </span>cusexmp_param {</div>
<div class="line">        <span class="keywordtype">unsigned</span>                major;</div>
<div class="line">        <span class="keywordtype">unsigned</span>                minor;</div>
<div class="line">        <span class="keywordtype">char</span>                    *dev_name;</div>
<div class="line">        <span class="keywordtype">int</span>                     is_help;</div>
<div class="line">};</div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#define CUSEXMP_OPT(t, p) { t, offsetof(struct cusexmp_param, p), 1 }</span></div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">struct </span><a class="code" href="structfuse__opt.html">fuse_opt</a> cusexmp_opts[] = {</div>
<div class="line">        CUSEXMP_OPT(<span class="stringliteral">&quot;-M %u&quot;</span>,            major),</div>
<div class="line">        CUSEXMP_OPT(<span class="stringliteral">&quot;--maj=%u&quot;</span>,         major),</div>
<div class="line">        CUSEXMP_OPT(<span class="stringliteral">&quot;-m %u&quot;</span>,            minor),</div>
<div class="line">        CUSEXMP_OPT(<span class="stringliteral">&quot;--min=%u&quot;</span>,         minor),</div>
<div class="line">        CUSEXMP_OPT(<span class="stringliteral">&quot;-n %s&quot;</span>,            dev_name),</div>
<div class="line">        CUSEXMP_OPT(<span class="stringliteral">&quot;--name=%s&quot;</span>,        dev_name),</div>
<div class="line">        <a class="code" href="fuse-3_813_80_2include_2fuse__opt_8h.html#a371d830a8aedd9e3f96d9bb31876a8f1">FUSE_OPT_KEY</a>(<span class="stringliteral">&quot;-h&quot;</span>,              0),</div>
<div class="line">        <a class="code" href="fuse-3_813_80_2include_2fuse__opt_8h.html#a371d830a8aedd9e3f96d9bb31876a8f1">FUSE_OPT_KEY</a>(<span class="stringliteral">&quot;--help&quot;</span>,          0),</div>
<div class="line">        <a class="code" href="fuse-3_813_80_2include_2fuse__opt_8h.html#aca35962e17d189ceb5447f8eea11bd33">FUSE_OPT_END</a></div>
<div class="line">};</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> cusexmp_process_arg(<span class="keywordtype">void</span> *data, <span class="keyword">const</span> <span class="keywordtype">char</span> *arg, <span class="keywordtype">int</span> key,</div>
<div class="line">                               <span class="keyword">struct</span> <a class="code" href="structfuse__args.html">fuse_args</a> *outargs)</div>
<div class="line">{</div>
<div class="line">        <span class="keyword">struct </span>cusexmp_param *param = data;</div>
<div class="line"> </div>
<div class="line">        (void)outargs;</div>
<div class="line">        (void)arg;</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">switch</span> (key) {</div>
<div class="line">        <span class="keywordflow">case</span> 0:</div>
<div class="line">                param-&gt;is_help = 1;</div>
<div class="line">                fprintf(stderr, <span class="stringliteral">&quot;%s&quot;</span>, usage);</div>
<div class="line">                <span class="keywordflow">return</span> <a class="code" href="fuse-3_813_80_2include_2fuse__opt_8h.html#a21602e6a0fff64fc9c7b642d12382094">fuse_opt_add_arg</a>(outargs, <span class="stringliteral">&quot;-ho&quot;</span>);</div>
<div class="line">        <span class="keywordflow">default</span>:</div>
<div class="line">                <span class="keywordflow">return</span> 1;</div>
<div class="line">        }</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">struct </span>cuse_lowlevel_ops cusexmp_clop = {</div>
<div class="line">        .open           = cusexmp_open,</div>
<div class="line">        .read           = cusexmp_read,</div>
<div class="line">        .write          = cusexmp_write,</div>
<div class="line">        .ioctl          = cusexmp_ioctl,</div>
<div class="line">};</div>
<div class="line"> </div>
<div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)</div>
<div class="line">{</div>
<div class="line">        <span class="keyword">struct </span><a class="code" href="structfuse__args.html">fuse_args</a> args = <a class="code" href="fuse-3_813_80_2include_2fuse__opt_8h.html#a9bea40fe56b18be9aa110185ab7387ed">FUSE_ARGS_INIT</a>(<a class="code" href="structfuse__args.html#a501883d1eababa08e05b0c802b31e11d">argc</a>, <a class="code" href="structfuse__args.html#aba205faea1c7b46b912bd509976a074a">argv</a>);</div>
<div class="line">        <span class="keyword">struct </span>cusexmp_param param = { 0, 0, NULL, 0 };</div>
<div class="line">        <span class="keywordtype">char</span> dev_name[128] = <span class="stringliteral">&quot;DEVNAME=&quot;</span>;</div>
<div class="line">        <span class="keyword">const</span> <span class="keywordtype">char</span> *dev_info_argv[] = { dev_name };</div>
<div class="line">        <span class="keyword">struct </span>cuse_info ci;</div>
<div class="line">        <span class="keywordtype">int</span> ret = 1;</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">if</span> (<a class="code" href="fuse-3_813_80_2include_2fuse__opt_8h.html#a539ef1f571c34f516c60c4cbe2901c0e">fuse_opt_parse</a>(&amp;args, &amp;param, cusexmp_opts, cusexmp_process_arg)) {</div>
<div class="line">                printf(<span class="stringliteral">&quot;failed to parse option\n&quot;</span>);</div>
<div class="line">                free(param.dev_name);</div>
<div class="line">                <span class="keywordflow">goto</span> out;</div>
<div class="line">        }</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">if</span> (!param.is_help) {</div>
<div class="line">                <span class="keywordflow">if</span> (!param.dev_name) {</div>
<div class="line">                        fprintf(stderr, <span class="stringliteral">&quot;Error: device name missing\n&quot;</span>);</div>
<div class="line">                        <span class="keywordflow">goto</span> out;</div>
<div class="line">                }</div>
<div class="line">                strncat(dev_name, param.dev_name, <span class="keyword">sizeof</span>(dev_name) - <span class="keyword">sizeof</span>(<span class="stringliteral">&quot;DEVNAME=&quot;</span>));</div>
<div class="line">                free(param.dev_name);</div>
<div class="line">        }</div>
<div class="line"> </div>
<div class="line">        memset(&amp;ci, 0, <span class="keyword">sizeof</span>(ci));</div>
<div class="line">        ci.dev_major = param.major;</div>
<div class="line">        ci.dev_minor = param.minor;</div>
<div class="line">        ci.dev_info_argc = 1;</div>
<div class="line">        ci.dev_info_argv = dev_info_argv;</div>
<div class="line">        ci.flags = CUSE_UNRESTRICTED_IOCTL;</div>
<div class="line"> </div>
<div class="line">        ret = cuse_lowlevel_main(args.<a class="code" href="structfuse__args.html#a501883d1eababa08e05b0c802b31e11d">argc</a>, args.<a class="code" href="structfuse__args.html#aba205faea1c7b46b912bd509976a074a">argv</a>, &amp;ci, &amp;cusexmp_clop, NULL);</div>
<div class="line"> </div>
<div class="line">out:</div>
<div class="line">        <a class="code" href="fuse-3_813_80_2include_2fuse__opt_8h.html#a2cdf272429ab3869a5162976141b287d">fuse_opt_free_args</a>(&amp;args);</div>
<div class="line">        <span class="keywordflow">return</span> ret;</div>
<div class="line">}</div>
<div class="ttc" id="afuse-3_813_80_2include_2fuse__common_8h_html_ade38f8e8c463cd40af5bfeeebfa99486"><div class="ttname"><a href="fuse-3_813_80_2include_2fuse__common_8h.html#ade38f8e8c463cd40af5bfeeebfa99486">FUSE_IOCTL_COMPAT</a></div><div class="ttdeci">#define FUSE_IOCTL_COMPAT</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2include_2fuse__common_8h_source.html#l00437">fuse_common.h:437</a></div></div>
<div class="ttc" id="afuse-3_813_80_2include_2fuse__lowlevel_8h_html_a170f8c6b953d70928e83bcecee43bfdc"><div class="ttname"><a href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a170f8c6b953d70928e83bcecee43bfdc">fuse_reply_open</a></div><div class="ttdeci">int fuse_reply_open(fuse_req_t req, const struct fuse_file_info *fi)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2lib_2fuse__lowlevel_8c_source.html#l00462">fuse_lowlevel.c:462</a></div></div>
<div class="ttc" id="afuse-3_813_80_2include_2fuse__lowlevel_8h_html_a2553c03f9a63c75e609e67f90a3a5d88"><div class="ttname"><a href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a2553c03f9a63c75e609e67f90a3a5d88">fuse_reply_err</a></div><div class="ttdeci">int fuse_reply_err(fuse_req_t req, int err)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2lib_2fuse__lowlevel_8c_source.html#l00319">fuse_lowlevel.c:319</a></div></div>
<div class="ttc" id="afuse-3_813_80_2include_2fuse__lowlevel_8h_html_a300a88b63ab7c8ca92853a97486448c0"><div class="ttname"><a href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a300a88b63ab7c8ca92853a97486448c0">fuse_reply_buf</a></div><div class="ttdeci">int fuse_reply_buf(fuse_req_t req, const char *buf, size_t size)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2lib_2fuse__lowlevel_8c_source.html#l00481">fuse_lowlevel.c:481</a></div></div>
<div class="ttc" id="afuse-3_813_80_2include_2fuse__lowlevel_8h_html_a33e2aa4a8905a05397292ae047cd2257"><div class="ttname"><a href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a33e2aa4a8905a05397292ae047cd2257">fuse_req_t</a></div><div class="ttdeci">struct fuse_req * fuse_req_t</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2include_2fuse__lowlevel_8h_source.html#l00049">fuse_lowlevel.h:49</a></div></div>
<div class="ttc" id="afuse-3_813_80_2include_2fuse__lowlevel_8h_html_a37381eb84c39e5fe3af9f3ef507aeeb7"><div class="ttname"><a href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a37381eb84c39e5fe3af9f3ef507aeeb7">fuse_reply_ioctl_iov</a></div><div class="ttdeci">int fuse_reply_ioctl_iov(fuse_req_t req, int result, const struct iovec *iov, int count)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2lib_2fuse__lowlevel_8c_source.html#l01047">fuse_lowlevel.c:1047</a></div></div>
<div class="ttc" id="afuse-3_813_80_2include_2fuse__lowlevel_8h_html_a940683d07df12c24f56b4363aed90e4d"><div class="ttname"><a href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#a940683d07df12c24f56b4363aed90e4d">fuse_reply_ioctl_retry</a></div><div class="ttdeci">int fuse_reply_ioctl_retry(fuse_req_t req, const struct iovec *in_iov, size_t in_count, const struct iovec *out_iov, size_t out_count)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2lib_2fuse__lowlevel_8c_source.html#l00956">fuse_lowlevel.c:956</a></div></div>
<div class="ttc" id="afuse-3_813_80_2include_2fuse__lowlevel_8h_html_aa3cfa73f61d6ef461ab5a3fbf859eb97"><div class="ttname"><a href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#aa3cfa73f61d6ef461ab5a3fbf859eb97">fuse_reply_write</a></div><div class="ttdeci">int fuse_reply_write(fuse_req_t req, size_t count)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2lib_2fuse__lowlevel_8c_source.html#l00471">fuse_lowlevel.c:471</a></div></div>
<div class="ttc" id="afuse-3_813_80_2include_2fuse__lowlevel_8h_html_adf7f34f470c04f276b7091ad3b3dcb31"><div class="ttname"><a href="fuse-3_813_80_2include_2fuse__lowlevel_8h.html#adf7f34f470c04f276b7091ad3b3dcb31">fuse_reply_ioctl</a></div><div class="ttdeci">int fuse_reply_ioctl(fuse_req_t req, int result, const void *buf, size_t size)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2lib_2fuse__lowlevel_8c_source.html#l01026">fuse_lowlevel.c:1026</a></div></div>
<div class="ttc" id="afuse-3_813_80_2include_2fuse__opt_8h_html_a21602e6a0fff64fc9c7b642d12382094"><div class="ttname"><a href="fuse-3_813_80_2include_2fuse__opt_8h.html#a21602e6a0fff64fc9c7b642d12382094">fuse_opt_add_arg</a></div><div class="ttdeci">int fuse_opt_add_arg(struct fuse_args *args, const char *arg)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2lib_2fuse__opt_8c_source.html#l00055">fuse_opt.c:55</a></div></div>
<div class="ttc" id="afuse-3_813_80_2include_2fuse__opt_8h_html_a2cdf272429ab3869a5162976141b287d"><div class="ttname"><a href="fuse-3_813_80_2include_2fuse__opt_8h.html#a2cdf272429ab3869a5162976141b287d">fuse_opt_free_args</a></div><div class="ttdeci">void fuse_opt_free_args(struct fuse_args *args)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2lib_2fuse__opt_8c_source.html#l00034">fuse_opt.c:34</a></div></div>
<div class="ttc" id="afuse-3_813_80_2include_2fuse__opt_8h_html_a371d830a8aedd9e3f96d9bb31876a8f1"><div class="ttname"><a href="fuse-3_813_80_2include_2fuse__opt_8h.html#a371d830a8aedd9e3f96d9bb31876a8f1">FUSE_OPT_KEY</a></div><div class="ttdeci">#define FUSE_OPT_KEY(templ, key)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2include_2fuse__opt_8h_source.html#l00098">fuse_opt.h:98</a></div></div>
<div class="ttc" id="afuse-3_813_80_2include_2fuse__opt_8h_html_a539ef1f571c34f516c60c4cbe2901c0e"><div class="ttname"><a href="fuse-3_813_80_2include_2fuse__opt_8h.html#a539ef1f571c34f516c60c4cbe2901c0e">fuse_opt_parse</a></div><div class="ttdeci">int fuse_opt_parse(struct fuse_args *args, void *data, const struct fuse_opt opts[], fuse_opt_proc_t proc)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2lib_2fuse__opt_8c_source.html#l00398">fuse_opt.c:398</a></div></div>
<div class="ttc" id="afuse-3_813_80_2include_2fuse__opt_8h_html_a9bea40fe56b18be9aa110185ab7387ed"><div class="ttname"><a href="fuse-3_813_80_2include_2fuse__opt_8h.html#a9bea40fe56b18be9aa110185ab7387ed">FUSE_ARGS_INIT</a></div><div class="ttdeci">#define FUSE_ARGS_INIT(argc, argv)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2include_2fuse__opt_8h_source.html#l00123">fuse_opt.h:123</a></div></div>
<div class="ttc" id="afuse-3_813_80_2include_2fuse__opt_8h_html_aca35962e17d189ceb5447f8eea11bd33"><div class="ttname"><a href="fuse-3_813_80_2include_2fuse__opt_8h.html#aca35962e17d189ceb5447f8eea11bd33">FUSE_OPT_END</a></div><div class="ttdeci">#define FUSE_OPT_END</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2include_2fuse__opt_8h_source.html#l00104">fuse_opt.h:104</a></div></div>
<div class="ttc" id="astructfuse__args_html"><div class="ttname"><a href="structfuse__args.html">fuse_args</a></div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2include_2fuse__opt_8h_source.html#l00109">fuse_opt.h:109</a></div></div>
<div class="ttc" id="astructfuse__args_html_a501883d1eababa08e05b0c802b31e11d"><div class="ttname"><a href="structfuse__args.html#a501883d1eababa08e05b0c802b31e11d">fuse_args::argc</a></div><div class="ttdeci">int argc</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2include_2fuse__opt_8h_source.html#l00111">fuse_opt.h:111</a></div></div>
<div class="ttc" id="astructfuse__args_html_aba205faea1c7b46b912bd509976a074a"><div class="ttname"><a href="structfuse__args.html#aba205faea1c7b46b912bd509976a074a">fuse_args::argv</a></div><div class="ttdeci">char ** argv</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2include_2fuse__opt_8h_source.html#l00114">fuse_opt.h:114</a></div></div>
<div class="ttc" id="astructfuse__file__info_html"><div class="ttname"><a href="structfuse__file__info.html">fuse_file_info</a></div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2include_2fuse__common_8h_source.html#l00044">fuse_common.h:44</a></div></div>
<div class="ttc" id="astructfuse__opt_html"><div class="ttname"><a href="structfuse__opt.html">fuse_opt</a></div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_813_80_2include_2fuse__opt_8h_source.html#l00077">fuse_opt.h:77</a></div></div>
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<p class="definition">Definition in file <a class="el" href="example_2cuse_8c_source.html">cuse.c</a>.</p>
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