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<li class="navelem"><a class="el" href="dir_539f20dca19be4c4b437d9fa1637e3e3.html">fuse-3.6.0</a></li><li class="navelem"><a class="el" href="dir_4a2ef2200a78c808c5af746e53a1305c.html">example</a></li> </ul>
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<a href="fuse-3_86_80_2example_2null_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> FUSE: Filesystem in Userspace</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu></span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"></span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> This program can be distributed under the terms of the GNU GPL.</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> See the file COPYING.</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment">*/</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> </div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#define FUSE_USE_VERSION 31</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> </div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include <fuse.h></span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="preprocessor">#include <fuse_lowlevel.h></span></div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#include <stdio.h></span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="preprocessor">#include <stdlib.h></span></div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#include <string.h></span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span> <span class="preprocessor">#include <unistd.h></span></div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="preprocessor">#include <time.h></span></div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="preprocessor">#include <errno.h></span></div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span> </div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="keyword">static</span> <span class="keywordtype">int</span> null_getattr(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, <span class="keyword">struct</span> stat *stbuf,</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi)</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> {</div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  (void) fi;</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  <span class="keywordflow">if</span>(strcmp(path, <span class="stringliteral">"/"</span>) != 0)</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keywordflow">return</span> -ENOENT;</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  stbuf->st_mode = S_IFREG | 0644;</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  stbuf->st_nlink = 1;</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  stbuf->st_uid = getuid();</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  stbuf->st_gid = getgid();</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  stbuf->st_size = (1ULL << 32); <span class="comment">/* 4G */</span></div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  stbuf->st_blocks = 0;</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  stbuf->st_atime = stbuf->st_mtime = stbuf->st_ctime = time(NULL);</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> </div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> }</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> </div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="keyword">static</span> <span class="keywordtype">int</span> null_truncate(<span class="keyword">const</span> <span class="keywordtype">char</span> *path, off_t size,</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keyword">struct</span> <a class="code" href="structfuse__file__info.html">fuse_file_info</a> *fi)</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span> {</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  (void) size;</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  (void) fi;</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> </div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordflow">if</span>(strcmp(path, <span class="stringliteral">"/"</span>) != 0)</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordflow">return</span> -ENOENT;</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span> </div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> }</div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> </div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="keyword">static</span> <span class="keywordtype">int</span> null_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"><a name="l00068"></a><span class="lineno"> 68</span> {</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  (void) fi;</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span> </div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">if</span>(strcmp(path, <span class="stringliteral">"/"</span>) != 0)</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">return</span> -ENOENT;</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span> }</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span> </div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> <span class="keyword">static</span> <span class="keywordtype">int</span> null_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"><a name="l00078"></a><span class="lineno"> 78</span>  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"><a name="l00079"></a><span class="lineno"> 79</span> {</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  (void) buf;</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  (void) offset;</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  (void) fi;</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span> </div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">if</span>(strcmp(path, <span class="stringliteral">"/"</span>) != 0)</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">return</span> -ENOENT;</div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span> </div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">if</span> (offset >= (1ULL << 32))</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  memset(buf, 0, size);</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keywordflow">return</span> size;</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span> }</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span> </div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> <span class="keyword">static</span> <span class="keywordtype">int</span> null_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"><a name="l00095"></a><span class="lineno"> 95</span>  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"><a name="l00096"></a><span class="lineno"> 96</span> {</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  (void) buf;</div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  (void) offset;</div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  (void) fi;</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">if</span>(strcmp(path, <span class="stringliteral">"/"</span>) != 0)</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  <span class="keywordflow">return</span> -ENOENT;</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> </div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">return</span> size;</div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span> }</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span> </div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span> <span class="keyword">static</span> <span class="keyword">struct </span><a class="code" href="structfuse__operations.html">fuse_operations</a> null_oper = {</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  .<a class="code" href="structfuse__operations.html#a60144dbd1a893008d9112e949300eb77">getattr</a> = null_getattr,</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  .truncate = null_truncate,</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  .open = null_open,</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  .read = null_read,</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  .write = null_write,</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> };</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span> </div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[])</div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span> {</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keyword">struct </span><a class="code" href="structfuse__args.html">fuse_args</a> args = <a class="code" href="fuse-3_86_80_2include_2fuse__opt_8h.html#a9bea40fe56b18be9aa110185ab7387ed">FUSE_ARGS_INIT</a>(argc, argv);</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keyword">struct </span>fuse_cmdline_opts opts;</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keyword">struct </span>stat stbuf;</div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span> </div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">if</span> (<a class="code" href="fuse-3_86_80_2include_2fuse__lowlevel_8h.html#a8421a0cb3b6fb7013c7272c6997d1e08">fuse_parse_cmdline</a>(&args, &opts) != 0)</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <a class="code" href="fuse-3_86_80_2include_2fuse__opt_8h.html#a2cdf272429ab3869a5162976141b287d">fuse_opt_free_args</a>(&args);</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span> </div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">if</span> (!opts.mountpoint) {</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  fprintf(stderr, <span class="stringliteral">"missing mountpoint parameter\n"</span>);</div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  }</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span> </div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">if</span> (stat(opts.mountpoint, &stbuf) == -1) {</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  fprintf(stderr ,<span class="stringliteral">"failed to access mountpoint %s: %s\n"</span>,</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  opts.mountpoint, strerror(errno));</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  free(opts.mountpoint);</div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  }</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  free(opts.mountpoint);</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keywordflow">if</span> (!S_ISREG(stbuf.st_mode)) {</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  fprintf(stderr, <span class="stringliteral">"mountpoint is not a regular file\n"</span>);</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  }</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span> </div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keywordflow">return</span> <a class="code" href="fuse-3_86_80_2include_2fuse_8h.html#ac99b844cee7aaa8fb4e35df5b5488d82">fuse_main</a>(argc, argv, &null_oper, NULL);</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span> }</div><div class="ttc" id="fuse-3_86_80_2include_2fuse__lowlevel_8h_html_a8421a0cb3b6fb7013c7272c6997d1e08"><div class="ttname"><a href="fuse-3_86_80_2include_2fuse__lowlevel_8h.html#a8421a0cb3b6fb7013c7272c6997d1e08">fuse_parse_cmdline</a></div><div class="ttdeci">int fuse_parse_cmdline(struct fuse_args *args, struct fuse_cmdline_opts *opts)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_86_80_2lib_2helper_8c_source.html#l00202">helper.c:202</a></div></div>
<div class="ttc" id="fuse-3_86_80_2include_2fuse__opt_8h_html_a9bea40fe56b18be9aa110185ab7387ed"><div class="ttname"><a href="fuse-3_86_80_2include_2fuse__opt_8h.html#a9bea40fe56b18be9aa110185ab7387ed">FUSE_ARGS_INIT</a></div><div class="ttdeci">#define FUSE_ARGS_INIT(argc, argv)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_86_80_2include_2fuse__opt_8h_source.html#l00123">fuse_opt.h:123</a></div></div>
<div class="ttc" id="structfuse__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_86_80_2include_2fuse__common_8h_source.html#l00043">fuse_common.h:43</a></div></div>
<div class="ttc" id="fuse-3_86_80_2include_2fuse_8h_html_ac99b844cee7aaa8fb4e35df5b5488d82"><div class="ttname"><a href="fuse-3_86_80_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_86_80_2include_2fuse_8h_source.html#l00864">fuse.h:864</a></div></div>
<div class="ttc" id="structfuse__operations_html"><div class="ttname"><a href="structfuse__operations.html">fuse_operations</a></div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_86_80_2include_2fuse_8h_source.html#l00299">fuse.h:299</a></div></div>
<div class="ttc" id="structfuse__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_86_80_2include_2fuse_8h_source.html#l00311">fuse.h:311</a></div></div>
<div class="ttc" id="structfuse__args_html"><div class="ttname"><a href="structfuse__args.html">fuse_args</a></div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_86_80_2include_2fuse__opt_8h_source.html#l00109">fuse_opt.h:109</a></div></div>
<div class="ttc" id="fuse-3_86_80_2include_2fuse__opt_8h_html_a2cdf272429ab3869a5162976141b287d"><div class="ttname"><a href="fuse-3_86_80_2include_2fuse__opt_8h.html#a2cdf272429ab3869a5162976141b287d">fuse_opt_free_args</a></div><div class="ttdeci">void fuse_opt_free_args(struct fuse_args *args)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_86_80_2lib_2fuse__opt_8c_source.html#l00033">fuse_opt.c:33</a></div></div>
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