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<div class="title">ioctl.c File Reference</div> </div>
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<div class="textblock"><code>#include <fuse.h></code><br />
<code>#include <stdlib.h></code><br />
<code>#include <stdio.h></code><br />
<code>#include <string.h></code><br />
<code>#include <unistd.h></code><br />
<code>#include <time.h></code><br />
<code>#include <errno.h></code><br />
<code>#include "<a class="el" href="example_2ioctl_8h_source.html">ioctl.h</a>"</code><br />
</div>
<p><a href="example_2ioctl_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 illustrates how to write a FUSE file system that can process (a restricted set of) ioctls. It can be tested with the ioctl_client.c program.</p>
<p>Compile with: </p><pre class="fragment">gcc -Wall ioctl.c `pkg-config fuse3 --cflags --libs` -o ioctl
</pre> <h2><a class="anchor" id="autotoc_md9"></a>
Source code</h2>
<div class="fragment"><div class="line"><span class="comment">/*</span></div>
<div class="line"><span class="comment"> FUSE fioc: FUSE ioctl example</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 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">#define FUSE_USE_VERSION 35</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#include <fuse.h></span></div>
<div class="line"><span class="preprocessor">#include <stdlib.h></span></div>
<div class="line"><span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><span class="preprocessor">#include <string.h></span></div>
<div class="line"><span class="preprocessor">#include <unistd.h></span></div>
<div class="line"><span class="preprocessor">#include <time.h></span></div>
<div class="line"><span class="preprocessor">#include <errno.h></span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#include "ioctl.h"</span></div>
<div class="line"> </div>
<div class="line"><span class="preprocessor">#define FIOC_NAME "fioc"</span></div>
<div class="line"> </div>
<div class="line"><span class="keyword">enum</span> {</div>
<div class="line"> FIOC_NONE,</div>
<div class="line"> FIOC_ROOT,</div>
<div class="line"> FIOC_FILE,</div>
<div class="line">};</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> *fioc_buf;</div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">size_t</span> fioc_size;</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> fioc_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 == fioc_size)</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line"> </div>
<div class="line"> new_buf = realloc(fioc_buf, new_size);</div>
<div class="line"> <span class="keywordflow">if</span> (!new_buf && 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 > fioc_size)</div>
<div class="line"> memset(new_buf + fioc_size, 0, new_size - fioc_size);</div>
<div class="line"> </div>
<div class="line"> fioc_buf = new_buf;</div>
<div class="line"> fioc_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> fioc_expand(<span class="keywordtype">size_t</span> new_size)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordflow">if</span> (new_size > fioc_size)</div>
<div class="line"> <span class="keywordflow">return</span> fioc_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">int</span> fioc_file_type(<span class="keyword">const</span> <span class="keywordtype">char</span> *path)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordflow">if</span> (strcmp(path, <span class="stringliteral">"/"</span>) == 0)</div>
<div class="line"> <span class="keywordflow">return</span> FIOC_ROOT;</div>
<div class="line"> <span class="keywordflow">if</span> (strcmp(path, <span class="stringliteral">"/"</span> FIOC_NAME) == 0)</div>
<div class="line"> <span class="keywordflow">return</span> FIOC_FILE;</div>
<div class="line"> <span class="keywordflow">return</span> FIOC_NONE;</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> fioc_getattr(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keyword">struct</span> stat *stbuf,</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"> stbuf->st_uid = getuid();</div>
<div class="line"> stbuf->st_gid = getgid();</div>
<div class="line"> stbuf->st_atime = stbuf->st_mtime = time(NULL);</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">switch</span> (fioc_file_type(path)) {</div>
<div class="line"> <span class="keywordflow">case</span> FIOC_ROOT:</div>
<div class="line"> stbuf->st_mode = S_IFDIR | 0755;</div>
<div class="line"> stbuf->st_nlink = 2;</div>
<div class="line"> <span class="keywordflow">break</span>;</div>
<div class="line"> <span class="keywordflow">case</span> FIOC_FILE:</div>
<div class="line"> stbuf->st_mode = S_IFREG | 0644;</div>
<div class="line"> stbuf->st_nlink = 1;</div>
<div class="line"> stbuf->st_size = fioc_size;</div>
<div class="line"> <span class="keywordflow">break</span>;</div>
<div class="line"> <span class="keywordflow">case</span> FIOC_NONE:</div>
<div class="line"> <span class="keywordflow">return</span> -ENOENT;</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"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> fioc_open(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <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> (fioc_file_type(path) != FIOC_NONE)</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line"> <span class="keywordflow">return</span> -ENOENT;</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> fioc_do_read(<span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> size, off_t offset)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordflow">if</span> (offset >= fioc_size)</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">if</span> (size > fioc_size - offset)</div>
<div class="line"> size = fioc_size - offset;</div>
<div class="line"> </div>
<div class="line"> memcpy(buf, fioc_buf + offset, size);</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">return</span> size;</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> fioc_read(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> size,</div>
<div class="line"> off_t offset, <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> (fioc_file_type(path) != FIOC_FILE)</div>
<div class="line"> <span class="keywordflow">return</span> -EINVAL;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">return</span> fioc_do_read(buf, size, offset);</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> fioc_do_write(<span class="keyword">const</span> <span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> size, off_t offset)</div>
<div class="line">{</div>
<div class="line"> <span class="keywordflow">if</span> (fioc_expand(offset + size))</div>
<div class="line"> <span class="keywordflow">return</span> -ENOMEM;</div>
<div class="line"> </div>
<div class="line"> memcpy(fioc_buf + offset, buf, size);</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">return</span> size;</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> fioc_write(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keyword">const</span> <span class="keywordtype">char</span> *buf, <span class="keywordtype">size_t</span> size,</div>
<div class="line"> off_t offset, <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> (fioc_file_type(path) != FIOC_FILE)</div>
<div class="line"> <span class="keywordflow">return</span> -EINVAL;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">return</span> fioc_do_write(buf, size, offset);</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> fioc_truncate(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, off_t size,</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"> <span class="keywordflow">if</span> (fioc_file_type(path) != FIOC_FILE)</div>
<div class="line"> <span class="keywordflow">return</span> -EINVAL;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">return</span> fioc_resize(size);</div>
<div class="line">}</div>
<div class="line"> </div>
<div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> fioc_readdir(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keywordtype">void</span> *buf, <a class="code" href="fuse-3_810_84_2include_2fuse_8h.html#a7dd132de66a5cc2add2a4eff5d435660">fuse_fill_dir_t</a> filler,</div>
<div class="line"> off_t offset, <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi,</div>
<div class="line"> <span class="keyword">enum</span> <a class="code" href="fuse-3_810_84_2include_2fuse_8h.html#af2bcf2a473b41b3cc8da8c079656a074">fuse_readdir_flags</a> flags)</div>
<div class="line">{</div>
<div class="line"> (void) fi;</div>
<div class="line"> (void) offset;</div>
<div class="line"> (void) flags;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">if</span> (fioc_file_type(path) != FIOC_ROOT)</div>
<div class="line"> <span class="keywordflow">return</span> -ENOENT;</div>
<div class="line"> </div>
<div class="line"> filler(buf, <span class="stringliteral">"."</span>, NULL, 0, 0);</div>
<div class="line"> filler(buf, <span class="stringliteral">".."</span>, NULL, 0, 0);</div>
<div class="line"> filler(buf, FIOC_NAME, NULL, 0, 0);</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> fioc_ioctl(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keywordtype">unsigned</span> <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> <span class="keywordtype">int</span> flags, <span class="keywordtype">void</span> *data)</div>
<div class="line">{</div>
<div class="line"> (void) arg;</div>
<div class="line"> (void) fi;</div>
<div class="line"> (void) flags;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">if</span> (fioc_file_type(path) != FIOC_FILE)</div>
<div class="line"> <span class="keywordflow">return</span> -EINVAL;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">if</span> (flags & <a class="code" href="fuse-3_810_84_2include_2fuse__common_8h.html#ade38f8e8c463cd40af5bfeeebfa99486">FUSE_IOCTL_COMPAT</a>)</div>
<div class="line"> <span class="keywordflow">return</span> -ENOSYS;</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="keywordtype">size_t</span> *)data = fioc_size;</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">case</span> FIOC_SET_SIZE:</div>
<div class="line"> fioc_resize(*(<span class="keywordtype">size_t</span> *)data);</div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line"> }</div>
<div class="line"> </div>
<div class="line"> <span class="keywordflow">return</span> -EINVAL;</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><a class="code" href="structfuse__operations.html">fuse_operations</a> fioc_oper = {</div>
<div class="line"> .<a class="code" href="structfuse__operations.html#a60144dbd1a893008d9112e949300eb77">getattr</a> = fioc_getattr,</div>
<div class="line"> .readdir = fioc_readdir,</div>
<div class="line"> .truncate = fioc_truncate,</div>
<div class="line"> .open = fioc_open,</div>
<div class="line"> .read = fioc_read,</div>
<div class="line"> .write = fioc_write,</div>
<div class="line"> .ioctl = fioc_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="keywordflow">return</span> <a class="code" href="fuse-3_810_84_2include_2fuse_8h.html#ac99b844cee7aaa8fb4e35df5b5488d82">fuse_main</a>(argc, argv, &fioc_oper, NULL);</div>
<div class="line">}</div>
<div class="ttc" id="afuse-3_810_84_2include_2fuse_8h_html_a7dd132de66a5cc2add2a4eff5d435660"><div class="ttname"><a href="fuse-3_810_84_2include_2fuse_8h.html#a7dd132de66a5cc2add2a4eff5d435660">fuse_fill_dir_t</a></div><div class="ttdeci">int(* fuse_fill_dir_t)(void *buf, const char *name, const struct stat *stbuf, off_t off, enum fuse_fill_dir_flags flags)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_810_84_2include_2fuse_8h_source.html#l00085">fuse.h:85</a></div></div>
<div class="ttc" id="afuse-3_810_84_2include_2fuse_8h_html_ac99b844cee7aaa8fb4e35df5b5488d82"><div class="ttname"><a href="fuse-3_810_84_2include_2fuse_8h.html#ac99b844cee7aaa8fb4e35df5b5488d82">fuse_main</a></div><div class="ttdeci">#define fuse_main(argc, argv, op, private_data)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_810_84_2include_2fuse_8h_source.html#l00878">fuse.h:878</a></div></div>
<div class="ttc" id="afuse-3_810_84_2include_2fuse_8h_html_af2bcf2a473b41b3cc8da8c079656a074"><div class="ttname"><a href="fuse-3_810_84_2include_2fuse_8h.html#af2bcf2a473b41b3cc8da8c079656a074">fuse_readdir_flags</a></div><div class="ttdeci">fuse_readdir_flags</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_810_84_2include_2fuse_8h_source.html#l00042">fuse.h:42</a></div></div>
<div class="ttc" id="afuse-3_810_84_2include_2fuse__common_8h_html_ade38f8e8c463cd40af5bfeeebfa99486"><div class="ttname"><a href="fuse-3_810_84_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_810_84_2include_2fuse__common_8h_source.html#l00407">fuse_common.h:407</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_810_84_2include_2fuse__common_8h_source.html#l00044">fuse_common.h:44</a></div></div>
<div class="ttc" id="astructfuse__operations_html"><div class="ttname"><a href="structfuse__operations.html">fuse_operations</a></div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_810_84_2include_2fuse_8h_source.html#l00302">fuse.h:302</a></div></div>
<div class="ttc" id="astructfuse__operations_html_a60144dbd1a893008d9112e949300eb77"><div class="ttname"><a href="structfuse__operations.html#a60144dbd1a893008d9112e949300eb77">fuse_operations::getattr</a></div><div class="ttdeci">int(* getattr)(const char *, struct stat *, struct fuse_file_info *fi)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_810_84_2include_2fuse_8h_source.html#l00314">fuse.h:314</a></div></div>
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<p class="definition">Definition in file <a class="el" href="example_2ioctl_8c_source.html">ioctl.c</a>.</p>
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