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<div class="title">ioctl.c File Reference</div> </div>
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<div class="textblock"><code>#include <<a class="el" href="fuse_8h_source.html">fuse.h</a>></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="ioctl_8h_source.html">ioctl.h</a>"</code><br />
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<p><a href="ioctl_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 <a class="el" href="ioctl__client_8c.html">ioctl_client.c</a> program.</p>
<p>Compile with: </p><pre class="fragment">gcc -Wall ioctl.c `pkg-config fuse3 --cflags --libs` -o ioctl
</pre><h2>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 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">#define FUSE_USE_VERSION 31</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include <<a class="code" href="fuse_8h.html">fuse.h</a>></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 "<a class="code" href="ioctl_8h.html">ioctl.h</a>"</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_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_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">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 & FUSE_IOCTL_COMPAT)</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">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#ac39a0b7125a0e5001eb5ff42e05faa5d">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_8h.html#ac99b844cee7aaa8fb4e35df5b5488d82">fuse_main</a>(argc, argv, &fioc_oper, NULL);</div><div class="line">}</div></div><!-- fragment -->
<p class="definition">Definition in file <a class="el" href="ioctl_8c_source.html">ioctl.c</a>.</p>
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