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<div class="textblock"><code>#include &lt;sys/types.h&gt;</code><br />
<code>#include &lt;fcntl.h&gt;</code><br />
<code>#include &lt;sys/stat.h&gt;</code><br />
<code>#include &lt;sys/ioctl.h&gt;</code><br />
<code>#include &lt;stdio.h&gt;</code><br />
<code>#include &lt;stdlib.h&gt;</code><br />
<code>#include &lt;ctype.h&gt;</code><br />
<code>#include &lt;errno.h&gt;</code><br />
<code>#include &lt;unistd.h&gt;</code><br />
<code>#include &quot;<a class="el" href="ioctl_8h_source.html">ioctl.h</a>&quot;</code><br />
</div>
<p><a href="cuse__client_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 program tests the <a class="el" href="cuse_8c.html">cuse.c</a> example file system.</p>
<p>Example usage (assuming that /dev/foobar is a CUSE device provided by the <a class="el" href="cuse_8c.html">cuse.c</a> example file system): </p><pre class="fragment">$ cuse_client /dev/foobar s
0

$ echo "hello" | cuse_client /dev/foobar w 6
Writing 6 bytes
transferred 6 bytes (0 -&gt; 6)

$ cuse_client /dev/foobar s
6

$ cuse_client /dev/foobar r 10
hello
transferred 6 bytes (6 -&gt; 6)
</pre><p> Compiling this example </p><pre class="fragment">gcc -Wall cuse_client.c -o cuse_client
</pre> <h2><a class="anchor" id="autotoc_md4"></a>
Source Code</h2>
<div class="fragment"><div class="line"><span class="comment">/*</span></div>
<div class="line"><span class="comment">  FUSE fioclient: FUSE ioctl example client</span></div>
<div class="line"><span class="comment">  Copyright (C) 2008       SUSE Linux Products GmbH</span></div>
<div class="line"><span class="comment">  Copyright (C) 2008       Tejun Heo &lt;teheo@suse.de&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"> </div>
<div class="line"><span class="preprocessor">#include &lt;sys/types.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;fcntl.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;sys/stat.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;sys/ioctl.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;ctype.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;errno.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &lt;unistd.h&gt;</span></div>
<div class="line"><span class="preprocessor">#include &quot;<a class="code" href="ioctl_8h.html">ioctl.h</a>&quot;</span></div>
<div class="line"> </div>
<div class="line"><span class="keyword">const</span> <span class="keywordtype">char</span> *usage =</div>
<div class="line"><span class="stringliteral">&quot;Usage: cuse_client FIOC_FILE COMMAND\n&quot;</span></div>
<div class="line"><span class="stringliteral">&quot;\n&quot;</span></div>
<div class="line"><span class="stringliteral">&quot;COMMANDS\n&quot;</span></div>
<div class="line"><span class="stringliteral">&quot;  s [SIZE]     : get size if SIZE is omitted, set size otherwise\n&quot;</span></div>
<div class="line"><span class="stringliteral">&quot;  r SIZE [OFF] : read SIZE bytes @ OFF (dfl 0) and output to stdout\n&quot;</span></div>
<div class="line"><span class="stringliteral">&quot;  w SIZE [OFF] : write SIZE bytes @ OFF (dfl 0) from stdin\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> do_rw(<span class="keywordtype">int</span> fd, <span class="keywordtype">int</span> is_read, <span class="keywordtype">size_t</span> size, off_t offset,</div>
<div class="line">                 <span class="keywordtype">size_t</span> *prev_size, <span class="keywordtype">size_t</span> *new_size)</div>
<div class="line">{</div>
<div class="line">        <span class="keyword">struct </span>fioc_rw_arg arg = { .offset = offset };</div>
<div class="line">        ssize_t ret;</div>
<div class="line"> </div>
<div class="line">        arg.buf = calloc(1, size);</div>
<div class="line">        <span class="keywordflow">if</span> (!arg.buf) {</div>
<div class="line">                fprintf(stderr, <span class="stringliteral">&quot;failed to allocated %zu bytes\n&quot;</span>, size);</div>
<div class="line">                <span class="keywordflow">return</span> -1;</div>
<div class="line">        }</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">if</span> (is_read) {</div>
<div class="line">                arg.size = size;</div>
<div class="line">                ret = ioctl(fd, FIOC_READ, &amp;arg);</div>
<div class="line">                <span class="keywordflow">if</span> (ret &gt;= 0)</div>
<div class="line">                        fwrite(arg.buf, 1, ret, stdout);</div>
<div class="line">        } <span class="keywordflow">else</span> {</div>
<div class="line">                arg.size = fread(arg.buf, 1, size, stdin);</div>
<div class="line">                fprintf(stderr, <span class="stringliteral">&quot;Writing %zu bytes\n&quot;</span>, arg.size);</div>
<div class="line">                ret = ioctl(fd, FIOC_WRITE, &amp;arg);</div>
<div class="line">        }</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">if</span> (ret &gt;= 0) {</div>
<div class="line">                *prev_size = arg.prev_size;</div>
<div class="line">                *new_size = arg.new_size;</div>
<div class="line">        } <span class="keywordflow">else</span></div>
<div class="line">                perror(<span class="stringliteral">&quot;ioctl&quot;</span>);</div>
<div class="line"> </div>
<div class="line">        free(arg.buf);</div>
<div class="line">        <span class="keywordflow">return</span> ret;</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="keywordtype">size_t</span> param[2] = { };</div>
<div class="line">        <span class="keywordtype">size_t</span> size, prev_size = 0, new_size = 0;</div>
<div class="line">        <span class="keywordtype">char</span> cmd;</div>
<div class="line">        <span class="keywordtype">int</span> fd, i, rc;</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">if</span> (argc &lt; 3)</div>
<div class="line">                <span class="keywordflow">goto</span> usage;</div>
<div class="line"> </div>
<div class="line">        fd = open(argv[1], O_RDWR);</div>
<div class="line">        <span class="keywordflow">if</span> (fd &lt; 0) {</div>
<div class="line">                perror(<span class="stringliteral">&quot;open&quot;</span>);</div>
<div class="line">                <span class="keywordflow">return</span> 1;</div>
<div class="line">        }</div>
<div class="line"> </div>
<div class="line">        cmd = tolower(argv[2][0]);</div>
<div class="line">        argc -= 3;</div>
<div class="line">        argv += 3;</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">for</span> (i = 0; i &lt; argc; i++) {</div>
<div class="line">                <span class="keywordtype">char</span> *endp;</div>
<div class="line">                param[i] = strtoul(argv[i], &amp;endp, 0);</div>
<div class="line">                <span class="keywordflow">if</span> (endp == argv[i] || *endp != <span class="charliteral">&#39;\0&#39;</span>)</div>
<div class="line">                        <span class="keywordflow">goto</span> usage;</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> <span class="charliteral">&#39;s&#39;</span>:</div>
<div class="line">                <span class="keywordflow">if</span> (!argc) {</div>
<div class="line">                        <span class="keywordflow">if</span> (ioctl(fd, FIOC_GET_SIZE, &amp;size)) {</div>
<div class="line">                                perror(<span class="stringliteral">&quot;ioctl&quot;</span>);</div>
<div class="line">                                <span class="keywordflow">goto</span> error;</div>
<div class="line">                        }</div>
<div class="line">                        printf(<span class="stringliteral">&quot;%zu\n&quot;</span>, size);</div>
<div class="line">                } <span class="keywordflow">else</span> {</div>
<div class="line">                        size = param[0];</div>
<div class="line">                        <span class="keywordflow">if</span> (ioctl(fd, FIOC_SET_SIZE, &amp;size)) {</div>
<div class="line">                                perror(<span class="stringliteral">&quot;ioctl&quot;</span>);</div>
<div class="line">                                <span class="keywordflow">goto</span> error;</div>
<div class="line">                        }</div>
<div class="line">                }</div>
<div class="line">                close(fd);</div>
<div class="line">                <span class="keywordflow">return</span> 0;</div>
<div class="line"> </div>
<div class="line">        <span class="keywordflow">case</span> <span class="charliteral">&#39;r&#39;</span>:</div>
<div class="line">        <span class="keywordflow">case</span> <span class="charliteral">&#39;w&#39;</span>:</div>
<div class="line">                rc = do_rw(fd, cmd == <span class="charliteral">&#39;r&#39;</span>, param[0], param[1],</div>
<div class="line">                           &amp;prev_size, &amp;new_size);</div>
<div class="line">                <span class="keywordflow">if</span> (rc &lt; 0)</div>
<div class="line">                        <span class="keywordflow">goto</span> error;</div>
<div class="line">                fprintf(stderr, <span class="stringliteral">&quot;transferred %d bytes (%zu -&gt; %zu)\n&quot;</span>,</div>
<div class="line">                        rc, prev_size, new_size);</div>
<div class="line">                close(fd);</div>
<div class="line">                <span class="keywordflow">return</span> 0;</div>
<div class="line">        }</div>
<div class="line"> </div>
<div class="line">usage:</div>
<div class="line">        fprintf(stderr, <span class="stringliteral">&quot;%s&quot;</span>, usage);</div>
<div class="line">        <span class="keywordflow">return</span> 1;</div>
<div class="line"> </div>
<div class="line">error:</div>
<div class="line">        close(fd);</div>
<div class="line">        <span class="keywordflow">return</span> 1;</div>
<div class="line">}</div>
<div class="ttc" id="aioctl_8h_html"><div class="ttname"><a href="ioctl_8h.html">ioctl.h</a></div></div>
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<p class="definition">Definition in file <a class="el" href="cuse__client_8c_source.html">cuse_client.c</a>.</p>
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