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<div class="title">cuse_client.c File Reference</div> </div>
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<div class="textblock"><code>#include <sys/types.h></code><br />
<code>#include <fcntl.h></code><br />
<code>#include <sys/stat.h></code><br />
<code>#include <sys/ioctl.h></code><br />
<code>#include <stdio.h></code><br />
<code>#include <stdlib.h></code><br />
<code>#include <ctype.h></code><br />
<code>#include <errno.h></code><br />
<code>#include "<a class="el" href="ioctl_8h_source.html">ioctl.h</a>"</code><br />
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<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 -> 6)
$ cuse_client /dev/foobar s
6
$ cuse_client /dev/foobar r 10
hello
transferred 6 bytes (6 -> 6)
</pre><p>Compiling this example </p><pre class="fragment">gcc -Wall cuse_client.c -o cuse_client
</pre><h2>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 <teheo@suse.de></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 GPL.</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 <sys/types.h></span></div><div class="line"><span class="preprocessor">#include <fcntl.h></span></div><div class="line"><span class="preprocessor">#include <sys/stat.h></span></div><div class="line"><span class="preprocessor">#include <sys/ioctl.h></span></div><div class="line"><span class="preprocessor">#include <stdio.h></span></div><div class="line"><span class="preprocessor">#include <stdlib.h></span></div><div class="line"><span class="preprocessor">#include <ctype.h></span></div><div class="line"><span class="preprocessor">#include <errno.h></span></div><div class="line"><span class="preprocessor">#include "<a class="code" href="ioctl_8h.html">ioctl.h</a>"</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">"Usage: cuse_client FIOC_FILE COMMAND\n"</span></div><div class="line"><span class="stringliteral">"\n"</span></div><div class="line"><span class="stringliteral">"COMMANDS\n"</span></div><div class="line"><span class="stringliteral">" s [SIZE] : get size if SIZE is omitted, set size otherwise\n"</span></div><div class="line"><span class="stringliteral">" r SIZE [OFF] : read SIZE bytes @ OFF (dfl 0) and output to stdout\n"</span></div><div class="line"><span class="stringliteral">" w SIZE [OFF] : write SIZE bytes @ OFF (dfl 0) from stdin\n"</span></div><div class="line"><span class="stringliteral">"\n"</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">"failed to allocated %zu bytes\n"</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, &arg);</div><div class="line"> <span class="keywordflow">if</span> (ret >= 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">"Writing %zu bytes\n"</span>, arg.size);</div><div class="line"> ret = ioctl(fd, FIOC_WRITE, &arg);</div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span> (ret >= 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">"ioctl"</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 < 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 < 0) {</div><div class="line"> perror(<span class="stringliteral">"open"</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 < argc; i++) {</div><div class="line"> <span class="keywordtype">char</span> *endp;</div><div class="line"> param[i] = strtoul(argv[i], &endp, 0);</div><div class="line"> <span class="keywordflow">if</span> (endp == argv[i] || *endp != <span class="charliteral">'\0'</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">'s'</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, &size)) {</div><div class="line"> perror(<span class="stringliteral">"ioctl"</span>);</div><div class="line"> <span class="keywordflow">return</span> 1;</div><div class="line"> }</div><div class="line"> printf(<span class="stringliteral">"%zu\n"</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, &size)) {</div><div class="line"> perror(<span class="stringliteral">"ioctl"</span>);</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">return</span> 0;</div><div class="line"></div><div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'r'</span>:</div><div class="line"> <span class="keywordflow">case</span> <span class="charliteral">'w'</span>:</div><div class="line"> rc = do_rw(fd, cmd == <span class="charliteral">'r'</span>, param[0], param[1],</div><div class="line"> &prev_size, &new_size);</div><div class="line"> <span class="keywordflow">if</span> (rc < 0)</div><div class="line"> <span class="keywordflow">return</span> 1;</div><div class="line"> fprintf(stderr, <span class="stringliteral">"transferred %d bytes (%zu -> %zu)\n"</span>,</div><div class="line"> rc, prev_size, new_size);</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">"%s"</span>, usage);</div><div class="line"> <span class="keywordflow">return</span> 1;</div><div class="line">}</div></div><!-- fragment -->
<p class="definition">Definition in file <a class="el" href="cuse__client_8c_source.html">cuse_client.c</a>.</p>
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