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<div class="textblock"><code>#include <<a class="el" href="fuse_8h_source.html">fuse.h</a>></code><br />
<code>#include <<a class="el" href="fuse__lowlevel_8h_source.html">fuse_lowlevel.h</a>></code><br />
<code>#include <stdio.h></code><br />
<code>#include <stdlib.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 />
</div>
<p><a href="null_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 "filesystem" provides only a single file. The mountpoint needs to be a file rather than a directory. All writes to the file will be discarded, and reading the file always returns \0.</p>
<p>Compile with: </p><pre class="fragment">gcc -Wall null.c `pkg-config fuse3 --cflags --libs` -o null
</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 <miklos@szeredi.hu></span></div><div class="line"><span class="comment"> Copyright (C) 2011 Sebastian Pipping <sebastian@pipping.org></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">#ifdef HAVE_CONFIG_H</span></div><div class="line"><span class="preprocessor">#include <config.h></span></div><div class="line"><span class="preprocessor">#endif</span></div><div class="line"></div><div class="line"><span class="preprocessor">#define _GNU_SOURCE</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"></div><div class="line"><span class="preprocessor">#ifdef HAVE_LIBULOCKMGR</span></div><div class="line"><span class="preprocessor">#include <ulockmgr.h></span></div><div class="line"><span class="preprocessor">#endif</span></div><div class="line"></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 <string.h></span></div><div class="line"><span class="preprocessor">#include <unistd.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 <dirent.h></span></div><div class="line"><span class="preprocessor">#include <errno.h></span></div><div class="line"><span class="preprocessor">#include <sys/time.h></span></div><div class="line"><span class="preprocessor">#ifdef HAVE_SETXATTR</span></div><div class="line"><span class="preprocessor">#include <sys/xattr.h></span></div><div class="line"><span class="preprocessor">#endif</span></div><div class="line"><span class="preprocessor">#include <sys/file.h></span> <span class="comment">/* flock(2) */</span></div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">void</span> *xmp_init(<span class="keyword">struct</span> <a class="code" href="structfuse__conn__info.html">fuse_conn_info</a> *conn,</div><div class="line"> <span class="keyword">struct</span> <a class="code" href="structfuse__config.html">fuse_config</a> *cfg)</div><div class="line">{</div><div class="line"> (void) conn;</div><div class="line"> cfg-><a class="code" href="structfuse__config.html#adf78e64e79e31c4fe1464cd0744ea725">use_ino</a> = 1;</div><div class="line"> cfg-><a class="code" href="structfuse__config.html#adc93fd1ac03d7f016d6b0bfab77f3863">nullpath_ok</a> = 1;</div><div class="line"></div><div class="line"> <span class="comment">/* Pick up changes from lower filesystem right away. This is</span></div><div class="line"><span class="comment"> also necessary for better hardlink support. When the kernel</span></div><div class="line"><span class="comment"> calls the unlink() handler, it does not know the inode of</span></div><div class="line"><span class="comment"> the to-be-removed entry and can therefore not invalidate</span></div><div class="line"><span class="comment"> the cache of the associated inode - resulting in an</span></div><div class="line"><span class="comment"> incorrect st_nlink value being reported for any remaining</span></div><div class="line"><span class="comment"> hardlinks to this inode. */</span></div><div class="line"> cfg-><a class="code" href="structfuse__config.html#a9bc2e3b1d8a4410215cd620553e61b62">entry_timeout</a> = 0;</div><div class="line"> cfg-><a class="code" href="structfuse__config.html#aeba85551d9498ca85fa2bf13b5e78eda">attr_timeout</a> = 0;</div><div class="line"> cfg-><a class="code" href="structfuse__config.html#ab4205f7343afe6e20edfbfb64cb90248">negative_timeout</a> = 0;</div><div class="line"></div><div class="line"> <span class="keywordflow">return</span> NULL;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_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"> <span class="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> (void) path;</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span>(fi)</div><div class="line"> res = fstat(fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>, stbuf);</div><div class="line"> <span class="keywordflow">else</span></div><div class="line"> res = lstat(path, stbuf);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</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> xmp_access(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keywordtype">int</span> mask)</div><div class="line">{</div><div class="line"> <span class="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> res = access(path, mask);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</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> xmp_readlink(<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">{</div><div class="line"> <span class="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> res = readlink(path, buf, size - 1);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</div><div class="line"></div><div class="line"> buf[res] = <span class="charliteral">'\0'</span>;</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">struct </span>xmp_dirp {</div><div class="line"> DIR *dp;</div><div class="line"> <span class="keyword">struct </span>dirent *entry;</div><div class="line"> off_t offset;</div><div class="line">};</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_opendir(<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"> <span class="keywordtype">int</span> res;</div><div class="line"> <span class="keyword">struct </span>xmp_dirp *d = malloc(<span class="keyword">sizeof</span>(<span class="keyword">struct</span> xmp_dirp));</div><div class="line"> <span class="keywordflow">if</span> (d == NULL)</div><div class="line"> <span class="keywordflow">return</span> -ENOMEM;</div><div class="line"></div><div class="line"> d->dp = opendir(path);</div><div class="line"> <span class="keywordflow">if</span> (d->dp == NULL) {</div><div class="line"> res = -errno;</div><div class="line"> free(d);</div><div class="line"> <span class="keywordflow">return</span> res;</div><div class="line"> }</div><div class="line"> d->offset = 0;</div><div class="line"> d->entry = NULL;</div><div class="line"></div><div class="line"> fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a> = (<span class="keywordtype">unsigned</span> long) d;</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="keyword">inline</span> <span class="keyword">struct </span>xmp_dirp *get_dirp(<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">return</span> (<span class="keyword">struct</span> xmp_dirp *) (uintptr_t) fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_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"> <span class="keyword">struct </span>xmp_dirp *d = get_dirp(fi);</div><div class="line"></div><div class="line"> (void) path;</div><div class="line"> <span class="keywordflow">if</span> (offset != d->offset) {</div><div class="line"><span class="preprocessor">#ifndef __FreeBSD__</span></div><div class="line"> seekdir(d->dp, offset);</div><div class="line"><span class="preprocessor">#else</span></div><div class="line"> <span class="comment">/* Subtract the one that we add when calling</span></div><div class="line"><span class="comment"> telldir() below */</span></div><div class="line"> seekdir(d->dp, offset-1);</div><div class="line"><span class="preprocessor">#endif</span></div><div class="line"> d->entry = NULL;</div><div class="line"> d->offset = offset;</div><div class="line"> }</div><div class="line"> <span class="keywordflow">while</span> (1) {</div><div class="line"> <span class="keyword">struct </span>stat st;</div><div class="line"> off_t nextoff;</div><div class="line"> <span class="keyword">enum</span> <a class="code" href="fuse_8h.html#af1d0194d186240ef6aaf6e9bf8568568">fuse_fill_dir_flags</a> fill_flags = 0;</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span> (!d->entry) {</div><div class="line"> d->entry = readdir(d->dp);</div><div class="line"> <span class="keywordflow">if</span> (!d->entry)</div><div class="line"> <span class="keywordflow">break</span>;</div><div class="line"> }</div><div class="line"><span class="preprocessor">#ifdef HAVE_FSTATAT</span></div><div class="line"> <span class="keywordflow">if</span> (flags & <a class="code" href="fuse_8h.html#af2bcf2a473b41b3cc8da8c079656a074ad62ab7c23f966a76282921e9187ca441">FUSE_READDIR_PLUS</a>) {</div><div class="line"> <span class="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> res = fstatat(dirfd(d->dp), d->entry->d_name, &st,</div><div class="line"> AT_SYMLINK_NOFOLLOW);</div><div class="line"> <span class="keywordflow">if</span> (res != -1)</div><div class="line"> fill_flags |= <a class="code" href="fuse_8h.html#af1d0194d186240ef6aaf6e9bf8568568a3f50d11935fe96eb4df6ff0844c4e153">FUSE_FILL_DIR_PLUS</a>;</div><div class="line"> }</div><div class="line"><span class="preprocessor">#endif</span></div><div class="line"> <span class="keywordflow">if</span> (!(fill_flags & <a class="code" href="fuse_8h.html#af1d0194d186240ef6aaf6e9bf8568568a3f50d11935fe96eb4df6ff0844c4e153">FUSE_FILL_DIR_PLUS</a>)) {</div><div class="line"> memset(&st, 0, <span class="keyword">sizeof</span>(st));</div><div class="line"> st.st_ino = d->entry->d_ino;</div><div class="line"> st.st_mode = d->entry->d_type << 12;</div><div class="line"> }</div><div class="line"> nextoff = telldir(d->dp);</div><div class="line"><span class="preprocessor">#ifdef __FreeBSD__ </span></div><div class="line"> <span class="comment">/* Under FreeBSD, telldir() may return 0 the first time</span></div><div class="line"><span class="comment"> it is called. But for libfuse, an offset of zero</span></div><div class="line"><span class="comment"> means that offsets are not supported, so we shift</span></div><div class="line"><span class="comment"> everything by one. */</span></div><div class="line"> nextoff++;</div><div class="line"><span class="preprocessor">#endif</span></div><div class="line"> <span class="keywordflow">if</span> (filler(buf, d->entry->d_name, &st, nextoff, fill_flags))</div><div class="line"> <span class="keywordflow">break</span>;</div><div class="line"></div><div class="line"> d->entry = NULL;</div><div class="line"> d->offset = nextoff;</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> xmp_releasedir(<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"> <span class="keyword">struct </span>xmp_dirp *d = get_dirp(fi);</div><div class="line"> (void) path;</div><div class="line"> closedir(d->dp);</div><div class="line"> free(d);</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> xmp_mknod(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, mode_t mode, dev_t rdev)</div><div class="line">{</div><div class="line"> <span class="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span> (S_ISFIFO(mode))</div><div class="line"> res = mkfifo(path, mode);</div><div class="line"> <span class="keywordflow">else</span></div><div class="line"> res = mknod(path, mode, rdev);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</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> xmp_mkdir(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, mode_t mode)</div><div class="line">{</div><div class="line"> <span class="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> res = mkdir(path, mode);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</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> xmp_unlink(<span class="keyword">const</span> <span class="keywordtype">char</span> *path)</div><div class="line">{</div><div class="line"> <span class="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> res = unlink(path);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</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> xmp_rmdir(<span class="keyword">const</span> <span class="keywordtype">char</span> *path)</div><div class="line">{</div><div class="line"> <span class="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> res = rmdir(path);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</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> xmp_symlink(<span class="keyword">const</span> <span class="keywordtype">char</span> *from, <span class="keyword">const</span> <span class="keywordtype">char</span> *to)</div><div class="line">{</div><div class="line"> <span class="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> res = symlink(from, to);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</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> xmp_rename(<span class="keyword">const</span> <span class="keywordtype">char</span> *from, <span class="keyword">const</span> <span class="keywordtype">char</span> *to, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> flags)</div><div class="line">{</div><div class="line"> <span class="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> <span class="comment">/* When we have renameat2() in libc, then we can implement flags */</span></div><div class="line"> <span class="keywordflow">if</span> (flags)</div><div class="line"> <span class="keywordflow">return</span> -EINVAL;</div><div class="line"></div><div class="line"> res = rename(from, to);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</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> xmp_link(<span class="keyword">const</span> <span class="keywordtype">char</span> *from, <span class="keyword">const</span> <span class="keywordtype">char</span> *to)</div><div class="line">{</div><div class="line"> <span class="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> res = link(from, to);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</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> xmp_chmod(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, mode_t mode,</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="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span>(fi)</div><div class="line"> res = fchmod(fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>, mode);</div><div class="line"> <span class="keywordflow">else</span></div><div class="line"> res = chmod(path, mode);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</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> xmp_chown(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, uid_t uid, gid_t gid,</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="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span> (fi)</div><div class="line"> res = fchown(fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>, uid, gid);</div><div class="line"> <span class="keywordflow">else</span></div><div class="line"> res = lchown(path, uid, gid);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</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> xmp_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"> <span class="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span>(fi)</div><div class="line"> res = ftruncate(fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>, size);</div><div class="line"> <span class="keywordflow">else</span></div><div class="line"> res = truncate(path, size);</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</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="preprocessor">#ifdef HAVE_UTIMENSAT</span></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_utimens(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keyword">const</span> <span class="keyword">struct</span> timespec ts[2],</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="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> <span class="comment">/* don't use utime/utimes since they follow symlinks */</span></div><div class="line"> <span class="keywordflow">if</span> (fi)</div><div class="line"> res = futimens(fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>, ts);</div><div class="line"> <span class="keywordflow">else</span></div><div class="line"> res = utimensat(0, path, ts, AT_SYMLINK_NOFOLLOW);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</div><div class="line"></div><div class="line"> <span class="keywordflow">return</span> 0;</div><div class="line">}</div><div class="line"><span class="preprocessor">#endif</span></div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_create(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, mode_t mode, <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="keywordtype">int</span> fd;</div><div class="line"></div><div class="line"> fd = open(path, fi-><a class="code" href="structfuse__file__info.html#ae7d31802727be19670193a411647bca5">flags</a>, mode);</div><div class="line"> <span class="keywordflow">if</span> (fd == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</div><div class="line"></div><div class="line"> fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a> = fd;</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> xmp_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"> <span class="keywordtype">int</span> fd;</div><div class="line"></div><div class="line"> fd = open(path, fi-><a class="code" href="structfuse__file__info.html#ae7d31802727be19670193a411647bca5">flags</a>);</div><div class="line"> <span class="keywordflow">if</span> (fd == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</div><div class="line"></div><div class="line"> fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a> = fd;</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> xmp_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, off_t offset,</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="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> (void) path;</div><div class="line"> res = pread(fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>, buf, size, offset);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> res = -errno;</div><div class="line"></div><div class="line"> <span class="keywordflow">return</span> res;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_read_buf(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keyword">struct</span> <a class="code" href="structfuse__bufvec.html">fuse_bufvec</a> **bufp,</div><div class="line"> <span class="keywordtype">size_t</span> size, 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"> <span class="keyword">struct </span><a class="code" href="structfuse__bufvec.html">fuse_bufvec</a> *src;</div><div class="line"></div><div class="line"> (void) path;</div><div class="line"></div><div class="line"> src = malloc(<span class="keyword">sizeof</span>(<span class="keyword">struct</span> <a class="code" href="structfuse__bufvec.html">fuse_bufvec</a>));</div><div class="line"> <span class="keywordflow">if</span> (src == NULL)</div><div class="line"> <span class="keywordflow">return</span> -ENOMEM;</div><div class="line"></div><div class="line"> *src = FUSE_BUFVEC_INIT(size);</div><div class="line"></div><div class="line"> src-><a class="code" href="structfuse__bufvec.html#a754caca61fdf8107d28b510505a033bb">buf</a>[0].<a class="code" href="structfuse__buf.html#a1928e204554f2d37cb8dac28a8a2f28c">flags</a> = <a class="code" href="fuse__common_8h.html#a5e36b839c4dbf0439bd85b61c7213a58affd5b3b7e9cdd5f89b3126eea96e033b">FUSE_BUF_IS_FD</a> | <a class="code" href="fuse__common_8h.html#a5e36b839c4dbf0439bd85b61c7213a58ad67d5c6075febad0594f06d46d02bfa9">FUSE_BUF_FD_SEEK</a>;</div><div class="line"> src-><a class="code" href="structfuse__bufvec.html#a754caca61fdf8107d28b510505a033bb">buf</a>[0].<a class="code" href="structfuse__buf.html#a62b2ae82904ac4355142984b9dd90d68">fd</a> = fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>;</div><div class="line"> src-><a class="code" href="structfuse__bufvec.html#a754caca61fdf8107d28b510505a033bb">buf</a>[0].<a class="code" href="structfuse__buf.html#a8de23b7869b06b9a9caef6beb7c9e88e">pos</a> = offset;</div><div class="line"></div><div class="line"> *bufp = src;</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> xmp_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"> <span class="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> (void) path;</div><div class="line"> res = pwrite(fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>, buf, size, offset);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> res = -errno;</div><div class="line"></div><div class="line"> <span class="keywordflow">return</span> res;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_write_buf(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keyword">struct</span> <a class="code" href="structfuse__bufvec.html">fuse_bufvec</a> *buf,</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"> <span class="keyword">struct </span><a class="code" href="structfuse__bufvec.html">fuse_bufvec</a> dst = FUSE_BUFVEC_INIT(<a class="code" href="fuse__common_8h.html#a4327f41b2fe1ca84151b407169bd86c0">fuse_buf_size</a>(buf));</div><div class="line"></div><div class="line"> (void) path;</div><div class="line"></div><div class="line"> dst.<a class="code" href="structfuse__bufvec.html#a754caca61fdf8107d28b510505a033bb">buf</a>[0].<a class="code" href="structfuse__buf.html#a1928e204554f2d37cb8dac28a8a2f28c">flags</a> = <a class="code" href="fuse__common_8h.html#a5e36b839c4dbf0439bd85b61c7213a58affd5b3b7e9cdd5f89b3126eea96e033b">FUSE_BUF_IS_FD</a> | <a class="code" href="fuse__common_8h.html#a5e36b839c4dbf0439bd85b61c7213a58ad67d5c6075febad0594f06d46d02bfa9">FUSE_BUF_FD_SEEK</a>;</div><div class="line"> dst.<a class="code" href="structfuse__bufvec.html#a754caca61fdf8107d28b510505a033bb">buf</a>[0].<a class="code" href="structfuse__buf.html#a62b2ae82904ac4355142984b9dd90d68">fd</a> = fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>;</div><div class="line"> dst.<a class="code" href="structfuse__bufvec.html#a754caca61fdf8107d28b510505a033bb">buf</a>[0].<a class="code" href="structfuse__buf.html#a8de23b7869b06b9a9caef6beb7c9e88e">pos</a> = offset;</div><div class="line"></div><div class="line"> <span class="keywordflow">return</span> <a class="code" href="fuse__common_8h.html#a9ca301390fb5e85b85153abb1891a3f7">fuse_buf_copy</a>(&dst, buf, <a class="code" href="fuse__common_8h.html#aec0ad71a3e8c357ebe7e87cdecbdbe18a32ec833f1eb4b5cd9283cf9d93021037">FUSE_BUF_SPLICE_NONBLOCK</a>);</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_statfs(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keyword">struct</span> statvfs *stbuf)</div><div class="line">{</div><div class="line"> <span class="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> res = statvfs(path, stbuf);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</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> xmp_flush(<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"> <span class="keywordtype">int</span> res;</div><div class="line"></div><div class="line"> (void) path;</div><div class="line"> <span class="comment">/* This is called from every close on an open file, so call the</span></div><div class="line"><span class="comment"> close on the underlying filesystem. But since flush may be</span></div><div class="line"><span class="comment"> called multiple times for an open file, this must not really</span></div><div class="line"><span class="comment"> close the file. This is important if used on a network</span></div><div class="line"><span class="comment"> filesystem like NFS which flush the data/metadata on close() */</span></div><div class="line"> res = close(dup(fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>));</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</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> xmp_release(<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) path;</div><div class="line"> close(fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>);</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> xmp_fsync(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keywordtype">int</span> isdatasync,</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="keywordtype">int</span> res;</div><div class="line"> (void) path;</div><div class="line"></div><div class="line"><span class="preprocessor">#ifndef HAVE_FDATASYNC</span></div><div class="line"> (void) isdatasync;</div><div class="line"><span class="preprocessor">#else</span></div><div class="line"> <span class="keywordflow">if</span> (isdatasync)</div><div class="line"> res = fdatasync(fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>);</div><div class="line"> <span class="keywordflow">else</span></div><div class="line"><span class="preprocessor">#endif</span></div><div class="line"> res = fsync(fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</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="preprocessor">#ifdef HAVE_POSIX_FALLOCATE</span></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_fallocate(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keywordtype">int</span> mode,</div><div class="line"> off_t offset, off_t length, <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) path;</div><div class="line"></div><div class="line"> <span class="keywordflow">if</span> (mode)</div><div class="line"> <span class="keywordflow">return</span> -EOPNOTSUPP;</div><div class="line"></div><div class="line"> <span class="keywordflow">return</span> -posix_fallocate(fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>, offset, length);</div><div class="line">}</div><div class="line"><span class="preprocessor">#endif</span></div><div class="line"></div><div class="line"><span class="preprocessor">#ifdef HAVE_SETXATTR</span></div><div class="line"><span class="comment">/* xattr operations are optional and can safely be left unimplemented */</span></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_setxattr(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keyword">const</span> <span class="keywordtype">char</span> *name, <span class="keyword">const</span> <span class="keywordtype">char</span> *value,</div><div class="line"> <span class="keywordtype">size_t</span> size, <span class="keywordtype">int</span> flags)</div><div class="line">{</div><div class="line"> <span class="keywordtype">int</span> res = lsetxattr(path, name, value, size, flags);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</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> xmp_getxattr(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keyword">const</span> <span class="keywordtype">char</span> *name, <span class="keywordtype">char</span> *value,</div><div class="line"> <span class="keywordtype">size_t</span> size)</div><div class="line">{</div><div class="line"> <span class="keywordtype">int</span> res = lgetxattr(path, name, value, size);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</div><div class="line"> <span class="keywordflow">return</span> res;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_listxattr(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keywordtype">char</span> *list, <span class="keywordtype">size_t</span> size)</div><div class="line">{</div><div class="line"> <span class="keywordtype">int</span> res = llistxattr(path, list, size);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</div><div class="line"> <span class="keywordflow">return</span> res;</div><div class="line">}</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_removexattr(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keyword">const</span> <span class="keywordtype">char</span> *name)</div><div class="line">{</div><div class="line"> <span class="keywordtype">int</span> res = lremovexattr(path, name);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</div><div class="line"> <span class="keywordflow">return</span> 0;</div><div class="line">}</div><div class="line"><span class="preprocessor">#endif </span><span class="comment">/* HAVE_SETXATTR */</span><span class="preprocessor"></span></div><div class="line"></div><div class="line"><span class="preprocessor">#ifdef HAVE_LIBULOCKMGR</span></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_lock(<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, <span class="keywordtype">int</span> cmd,</div><div class="line"> <span class="keyword">struct</span> flock *lock)</div><div class="line">{</div><div class="line"> (void) path;</div><div class="line"></div><div class="line"> <span class="keywordflow">return</span> ulockmgr_op(fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>, cmd, lock, &fi-><a class="code" href="structfuse__file__info.html#a3575f36b21f406c211c41c8c31323688">lock_owner</a>,</div><div class="line"> <span class="keyword">sizeof</span>(fi-><a class="code" href="structfuse__file__info.html#a3575f36b21f406c211c41c8c31323688">lock_owner</a>));</div><div class="line">}</div><div class="line"><span class="preprocessor">#endif</span></div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keywordtype">int</span> xmp_flock(<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, <span class="keywordtype">int</span> op)</div><div class="line">{</div><div class="line"> <span class="keywordtype">int</span> res;</div><div class="line"> (void) path;</div><div class="line"></div><div class="line"> res = flock(fi-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>, op);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</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="preprocessor">#ifdef HAVE_COPY_FILE_RANGE</span></div><div class="line"><span class="keyword">static</span> ssize_t xmp_copy_file_range(<span class="keyword">const</span> <span class="keywordtype">char</span> *path_in,</div><div class="line"> <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi_in,</div><div class="line"> off_t off_in, <span class="keyword">const</span> <span class="keywordtype">char</span> *path_out,</div><div class="line"> <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi_out,</div><div class="line"> off_t off_out, <span class="keywordtype">size_t</span> len, <span class="keywordtype">int</span> flags)</div><div class="line">{</div><div class="line"> ssize_t res;</div><div class="line"> (void) path_in;</div><div class="line"> (void) path_out;</div><div class="line"></div><div class="line"> res = copy_file_range(fi_in-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>, &off_in, fi_out-><a class="code" href="structfuse__file__info.html#a45314d0b92a8d4c9de33d996aa59ada8">fh</a>, &off_out, len,</div><div class="line"> flags);</div><div class="line"> <span class="keywordflow">if</span> (res == -1)</div><div class="line"> <span class="keywordflow">return</span> -errno;</div><div class="line"></div><div class="line"> <span class="keywordflow">return</span> res;</div><div class="line">}</div><div class="line"><span class="preprocessor">#endif</span></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> xmp_oper = {</div><div class="line"> .<a class="code" href="structfuse__operations.html#a0ad1f7c4105ee062528c767da88060f0">init</a> = xmp_init,</div><div class="line"> .getattr = xmp_getattr,</div><div class="line"> .access = xmp_access,</div><div class="line"> .readlink = xmp_readlink,</div><div class="line"> .opendir = xmp_opendir,</div><div class="line"> .readdir = xmp_readdir,</div><div class="line"> .releasedir = xmp_releasedir,</div><div class="line"> .mknod = xmp_mknod,</div><div class="line"> .mkdir = xmp_mkdir,</div><div class="line"> .symlink = xmp_symlink,</div><div class="line"> .unlink = xmp_unlink,</div><div class="line"> .rmdir = xmp_rmdir,</div><div class="line"> .rename = xmp_rename,</div><div class="line"> .link = xmp_link,</div><div class="line"> .chmod = xmp_chmod,</div><div class="line"> .chown = xmp_chown,</div><div class="line"> .truncate = xmp_truncate,</div><div class="line"><span class="preprocessor">#ifdef HAVE_UTIMENSAT</span></div><div class="line"> .utimens = xmp_utimens,</div><div class="line"><span class="preprocessor">#endif</span></div><div class="line"> .create = xmp_create,</div><div class="line"> .open = xmp_open,</div><div class="line"> .read = xmp_read,</div><div class="line"> .read_buf = xmp_read_buf,</div><div class="line"> .write = xmp_write,</div><div class="line"> .write_buf = xmp_write_buf,</div><div class="line"> .statfs = xmp_statfs,</div><div class="line"> .flush = xmp_flush,</div><div class="line"> .release = xmp_release,</div><div class="line"> .fsync = xmp_fsync,</div><div class="line"><span class="preprocessor">#ifdef HAVE_POSIX_FALLOCATE</span></div><div class="line"> .fallocate = xmp_fallocate,</div><div class="line"><span class="preprocessor">#endif</span></div><div class="line"><span class="preprocessor">#ifdef HAVE_SETXATTR</span></div><div class="line"> .setxattr = xmp_setxattr,</div><div class="line"> .getxattr = xmp_getxattr,</div><div class="line"> .listxattr = xmp_listxattr,</div><div class="line"> .removexattr = xmp_removexattr,</div><div class="line"><span class="preprocessor">#endif</span></div><div class="line"><span class="preprocessor">#ifdef HAVE_LIBULOCKMGR</span></div><div class="line"> .lock = xmp_lock,</div><div class="line"><span class="preprocessor">#endif</span></div><div class="line"> .flock = xmp_flock,</div><div class="line"><span class="preprocessor">#ifdef HAVE_COPY_FILE_RANGE</span></div><div class="line"> .copy_file_range = xmp_copy_file_range,</div><div class="line"><span class="preprocessor">#endif</span></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"> umask(0);</div><div class="line"> <span class="keywordflow">return</span> <a class="code" href="fuse_8h.html#ac99b844cee7aaa8fb4e35df5b5488d82">fuse_main</a>(argc, argv, &xmp_oper, NULL);</div><div class="line">}</div></div><!-- fragment -->
<p class="definition">Definition in file <a class="el" href="null_8c_source.html">null.c</a>.</p>
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