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<div class="textblock"><code>#include &lt;<a class="el" href="fuse__lowlevel_8h_source.html">fuse_lowlevel.h</a>&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;errno.h&gt;</code><br />
<code>#include &lt;fcntl.h&gt;</code><br />
<code>#include &lt;unistd.h&gt;</code><br />
<code>#include &lt;assert.h&gt;</code><br />
</div>
<p><a href="hello__ll_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>minimal example filesystem using low-level API</p>
<p>Compile with: </p><pre class="fragment">gcc -Wall hello_ll.c `pkg-config fuse3 --cflags --libs` -o hello_ll
</pre><h2>Source code</h2>
<div class="fragment"><div class="line"><span class="comment">/*</span></div><div class="line"><span class="comment">  FUSE: Filesystem in Userspace</span></div><div class="line"><span class="comment">  Copyright (C) 2001-2007  Miklos Szeredi &lt;miklos@szeredi.hu&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 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 &lt;<a class="code" href="fuse__lowlevel_8h.html">fuse_lowlevel.h</a>&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;errno.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;unistd.h&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;assert.h&gt;</span></div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *hello_str = <span class="stringliteral">&quot;Hello World!\n&quot;</span>;</div><div class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *hello_name = <span class="stringliteral">&quot;hello&quot;</span>;</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> hello_stat(<a class="code" href="fuse__lowlevel_8h.html#ad119a72f00b4cd2e4a500fd3364ae1e2">fuse_ino_t</a> ino, <span class="keyword">struct</span> stat *stbuf)</div><div class="line">{</div><div class="line">        stbuf-&gt;st_ino = ino;</div><div class="line">        <span class="keywordflow">switch</span> (ino) {</div><div class="line">        <span class="keywordflow">case</span> 1:</div><div class="line">                stbuf-&gt;st_mode = S_IFDIR | 0755;</div><div class="line">                stbuf-&gt;st_nlink = 2;</div><div class="line">                <span class="keywordflow">break</span>;</div><div class="line"></div><div class="line">        <span class="keywordflow">case</span> 2:</div><div class="line">                stbuf-&gt;st_mode = S_IFREG | 0444;</div><div class="line">                stbuf-&gt;st_nlink = 1;</div><div class="line">                stbuf-&gt;st_size = strlen(hello_str);</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">                <span class="keywordflow">return</span> -1;</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">void</span> hello_ll_getattr(<a class="code" href="fuse__lowlevel_8h.html#a33e2aa4a8905a05397292ae047cd2257">fuse_req_t</a> req, <a class="code" href="fuse__lowlevel_8h.html#ad119a72f00b4cd2e4a500fd3364ae1e2">fuse_ino_t</a> ino,</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">        <span class="keyword">struct </span>stat stbuf;</div><div class="line"></div><div class="line">        (void) fi;</div><div class="line"></div><div class="line">        memset(&amp;stbuf, 0, <span class="keyword">sizeof</span>(stbuf));</div><div class="line">        <span class="keywordflow">if</span> (hello_stat(ino, &amp;stbuf) == -1)</div><div class="line">                <a class="code" href="fuse__lowlevel_8h.html#a2553c03f9a63c75e609e67f90a3a5d88">fuse_reply_err</a>(req, ENOENT);</div><div class="line">        <span class="keywordflow">else</span></div><div class="line">                <a class="code" href="fuse__lowlevel_8h.html#ad28378dc569019c32acdb4995d70be18">fuse_reply_attr</a>(req, &amp;stbuf, 1.0);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> hello_ll_lookup(<a class="code" href="fuse__lowlevel_8h.html#a33e2aa4a8905a05397292ae047cd2257">fuse_req_t</a> req, <a class="code" href="fuse__lowlevel_8h.html#ad119a72f00b4cd2e4a500fd3364ae1e2">fuse_ino_t</a> parent, <span class="keyword">const</span> <span class="keywordtype">char</span> *name)</div><div class="line">{</div><div class="line">        <span class="keyword">struct </span><a class="code" href="structfuse__entry__param.html">fuse_entry_param</a> e;</div><div class="line"></div><div class="line">        <span class="keywordflow">if</span> (parent != 1 || strcmp(name, hello_name) != 0)</div><div class="line">                <a class="code" href="fuse__lowlevel_8h.html#a2553c03f9a63c75e609e67f90a3a5d88">fuse_reply_err</a>(req, ENOENT);</div><div class="line">        <span class="keywordflow">else</span> {</div><div class="line">                memset(&amp;e, 0, <span class="keyword">sizeof</span>(e));</div><div class="line">                e.ino = 2;</div><div class="line">                e.attr_timeout = 1.0;</div><div class="line">                e.entry_timeout = 1.0;</div><div class="line">                hello_stat(e.ino, &amp;e.attr);</div><div class="line"></div><div class="line">                <a class="code" href="fuse__lowlevel_8h.html#a672c45e126cd240f4bcd59bf9b7e3708">fuse_reply_entry</a>(req, &amp;e);</div><div class="line">        }</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">struct </span>dirbuf {</div><div class="line">        <span class="keywordtype">char</span> *p;</div><div class="line">        <span class="keywordtype">size_t</span> size;</div><div class="line">};</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> dirbuf_add(<a class="code" href="fuse__lowlevel_8h.html#a33e2aa4a8905a05397292ae047cd2257">fuse_req_t</a> req, <span class="keyword">struct</span> dirbuf *b, <span class="keyword">const</span> <span class="keywordtype">char</span> *name,</div><div class="line">                       <a class="code" href="fuse__lowlevel_8h.html#ad119a72f00b4cd2e4a500fd3364ae1e2">fuse_ino_t</a> ino)</div><div class="line">{</div><div class="line">        <span class="keyword">struct </span>stat stbuf;</div><div class="line">        <span class="keywordtype">size_t</span> oldsize = b-&gt;size;</div><div class="line">        b-&gt;size += <a class="code" href="fuse__lowlevel_8h.html#ad1957bcc8ece8c90f16c42c4daf3053f">fuse_add_direntry</a>(req, NULL, 0, name, NULL, 0);</div><div class="line">        b-&gt;p = (<span class="keywordtype">char</span> *) realloc(b-&gt;p, b-&gt;size);</div><div class="line">        memset(&amp;stbuf, 0, <span class="keyword">sizeof</span>(stbuf));</div><div class="line">        stbuf.st_ino = ino;</div><div class="line">        <a class="code" href="fuse__lowlevel_8h.html#ad1957bcc8ece8c90f16c42c4daf3053f">fuse_add_direntry</a>(req, b-&gt;p + oldsize, b-&gt;size - oldsize, name, &amp;stbuf,</div><div class="line">                          b-&gt;size);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="preprocessor">#define min(x, y) ((x) &lt; (y) ? (x) : (y))</span></div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> reply_buf_limited(<a class="code" href="fuse__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> bufsize,</div><div class="line">                             off_t off, <span class="keywordtype">size_t</span> maxsize)</div><div class="line">{</div><div class="line">        <span class="keywordflow">if</span> (off &lt; bufsize)</div><div class="line">                <span class="keywordflow">return</span> <a class="code" href="fuse__lowlevel_8h.html#a300a88b63ab7c8ca92853a97486448c0">fuse_reply_buf</a>(req, buf + off,</div><div class="line">                                      min(bufsize - off, maxsize));</div><div class="line">        <span class="keywordflow">else</span></div><div class="line">                <span class="keywordflow">return</span> <a class="code" href="fuse__lowlevel_8h.html#a300a88b63ab7c8ca92853a97486448c0">fuse_reply_buf</a>(req, NULL, 0);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> hello_ll_readdir(<a class="code" href="fuse__lowlevel_8h.html#a33e2aa4a8905a05397292ae047cd2257">fuse_req_t</a> req, <a class="code" href="fuse__lowlevel_8h.html#ad119a72f00b4cd2e4a500fd3364ae1e2">fuse_ino_t</a> ino, <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> (ino != 1)</div><div class="line">                <a class="code" href="fuse__lowlevel_8h.html#a2553c03f9a63c75e609e67f90a3a5d88">fuse_reply_err</a>(req, ENOTDIR);</div><div class="line">        <span class="keywordflow">else</span> {</div><div class="line">                <span class="keyword">struct </span>dirbuf b;</div><div class="line"></div><div class="line">                memset(&amp;b, 0, <span class="keyword">sizeof</span>(b));</div><div class="line">                dirbuf_add(req, &amp;b, <span class="stringliteral">&quot;.&quot;</span>, 1);</div><div class="line">                dirbuf_add(req, &amp;b, <span class="stringliteral">&quot;..&quot;</span>, 1);</div><div class="line">                dirbuf_add(req, &amp;b, hello_name, 2);</div><div class="line">                reply_buf_limited(req, b.p, b.size, off, size);</div><div class="line">                free(b.p);</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> hello_ll_open(<a class="code" href="fuse__lowlevel_8h.html#a33e2aa4a8905a05397292ae047cd2257">fuse_req_t</a> req, <a class="code" href="fuse__lowlevel_8h.html#ad119a72f00b4cd2e4a500fd3364ae1e2">fuse_ino_t</a> ino,</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">        <span class="keywordflow">if</span> (ino != 2)</div><div class="line">                <a class="code" href="fuse__lowlevel_8h.html#a2553c03f9a63c75e609e67f90a3a5d88">fuse_reply_err</a>(req, EISDIR);</div><div class="line">        <span class="keywordflow">else</span> <span class="keywordflow">if</span> ((fi-&gt;<a class="code" href="structfuse__file__info.html#ae7d31802727be19670193a411647bca5">flags</a> &amp; 3) != O_RDONLY)</div><div class="line">                <a class="code" href="fuse__lowlevel_8h.html#a2553c03f9a63c75e609e67f90a3a5d88">fuse_reply_err</a>(req, EACCES);</div><div class="line">        <span class="keywordflow">else</span></div><div class="line">                <a class="code" href="fuse__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> hello_ll_read(<a class="code" href="fuse__lowlevel_8h.html#a33e2aa4a8905a05397292ae047cd2257">fuse_req_t</a> req, <a class="code" href="fuse__lowlevel_8h.html#ad119a72f00b4cd2e4a500fd3364ae1e2">fuse_ino_t</a> ino, <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">        assert(ino == 2);</div><div class="line">        reply_buf_limited(req, hello_str, strlen(hello_str), off, size);</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__lowlevel__ops.html">fuse_lowlevel_ops</a> hello_ll_oper = {</div><div class="line">        .<a class="code" href="structfuse__lowlevel__ops.html#a7f46abd7c2795cfcf7a3d8c5ee8f6c70">lookup</a>         = hello_ll_lookup,</div><div class="line">        .getattr        = hello_ll_getattr,</div><div class="line">        .readdir        = hello_ll_readdir,</div><div class="line">        .open           = hello_ll_open,</div><div class="line">        .read           = hello_ll_read,</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__opt_8h.html#a9bea40fe56b18be9aa110185ab7387ed">FUSE_ARGS_INIT</a>(argc, argv);</div><div class="line">        <span class="keyword">struct </span>fuse_session *se;</div><div class="line">        <span class="keyword">struct </span>fuse_cmdline_opts opts;</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__lowlevel_8h.html#a8421a0cb3b6fb7013c7272c6997d1e08">fuse_parse_cmdline</a>(&amp;args, &amp;opts) != 0)</div><div class="line">                <span class="keywordflow">return</span> 1;</div><div class="line">        <span class="keywordflow">if</span> (opts.show_help) {</div><div class="line">                printf(<span class="stringliteral">&quot;usage: %s [options] &lt;mountpoint&gt;\n\n&quot;</span>, argv[0]);</div><div class="line">                <a class="code" href="fuse__lowlevel_8h.html#a7235e3a2d1c780d5e0beaee13c81529f">fuse_cmdline_help</a>();</div><div class="line">                <a class="code" href="fuse__lowlevel_8h.html#a990af0becaba1b5e45781d399720f85e">fuse_lowlevel_help</a>();</div><div class="line">                ret = 0;</div><div class="line">                <span class="keywordflow">goto</span> err_out1;</div><div class="line">        } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (opts.show_version) {</div><div class="line">                printf(<span class="stringliteral">&quot;FUSE library version %s\n&quot;</span>, <a class="code" href="fuse__common_8h.html#ac52e27388a7c16eb509173908e5eebd0">fuse_pkgversion</a>());</div><div class="line">                <a class="code" href="fuse__lowlevel_8h.html#ac6e2d0fde62dcf4f0e57afeabeefd7b1">fuse_lowlevel_version</a>();</div><div class="line">                ret = 0;</div><div class="line">                <span class="keywordflow">goto</span> err_out1;</div><div class="line">        }</div><div class="line"></div><div class="line">        se = <a class="code" href="fuse__lowlevel_8h.html#a9ee52f81d0c63d9bd46b11314ba596cf">fuse_session_new</a>(&amp;args, &amp;hello_ll_oper,</div><div class="line">                              <span class="keyword">sizeof</span>(hello_ll_oper), NULL);</div><div class="line">        <span class="keywordflow">if</span> (se == NULL)</div><div class="line">            <span class="keywordflow">goto</span> err_out1;</div><div class="line"></div><div class="line">        <span class="keywordflow">if</span> (<a class="code" href="fuse__common_8h.html#a292dccc3c7b1799cb054efa2ba0c774b">fuse_set_signal_handlers</a>(se) != 0)</div><div class="line">            <span class="keywordflow">goto</span> err_out2;</div><div class="line"></div><div class="line">        <span class="keywordflow">if</span> (<a class="code" href="fuse__lowlevel_8h.html#aa6d77679a110582684e9ca2da623bbc2">fuse_session_mount</a>(se, opts.mountpoint) != 0)</div><div class="line">            <span class="keywordflow">goto</span> err_out3;</div><div class="line"></div><div class="line">        <a class="code" href="fuse__common_8h.html#af1857d2209952f49a762aff39f3cd8bd">fuse_daemonize</a>(opts.foreground);</div><div class="line"></div><div class="line">        <span class="comment">/* Block until ctrl+c or fusermount -u */</span></div><div class="line">        <span class="keywordflow">if</span> (opts.singlethread)</div><div class="line">                ret = <a class="code" href="fuse__lowlevel_8h.html#a5f1e538aa3287e251afbe985438c4249">fuse_session_loop</a>(se);</div><div class="line">        <span class="keywordflow">else</span></div><div class="line">                ret = fuse_session_loop_mt(se, opts.clone_fd);</div><div class="line"></div><div class="line">        <a class="code" href="fuse__lowlevel_8h.html#a6c10d942751ddb214863a8b5e53de5e8">fuse_session_unmount</a>(se);</div><div class="line">err_out3:</div><div class="line">        <a class="code" href="fuse__common_8h.html#aeb674bbc11074c4fe520b952d6bfdd30">fuse_remove_signal_handlers</a>(se);</div><div class="line">err_out2:</div><div class="line">        <a class="code" href="fuse__lowlevel_8h.html#a08b5503c4e9656f9c4bc88331233cc65">fuse_session_destroy</a>(se);</div><div class="line">err_out1:</div><div class="line">        free(opts.mountpoint);</div><div class="line">        <a class="code" href="fuse__opt_8h.html#a2cdf272429ab3869a5162976141b287d">fuse_opt_free_args</a>(&amp;args);</div><div class="line"></div><div class="line">        <span class="keywordflow">return</span> ret ? 1 : 0;</div><div class="line">}</div></div><!-- fragment --> 
<p class="definition">Definition in file <a class="el" href="hello__ll_8c_source.html">hello_ll.c</a>.</p>
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