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<li class="navelem"><a class="el" href="dir_f5e8fba32b5f8371b5d1176ec2d02e1b.html">fuse-3.11.0</a></li><li class="navelem"><a class="el" href="dir_eef61fd238f07cd7553c5c19524c363e.html">example</a></li> </ul>
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<a href="fuse-3_811_80_2example_2cuse__client_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 fioclient: FUSE ioctl example client</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> Copyright (C) 2008 SUSE Linux Products GmbH</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> Copyright (C) 2008 Tejun Heo <teheo@suse.de></span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"></span> </div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> This program can be distributed under the terms of the GNU GPLv2.</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> See the file COPYING.</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>  </div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="preprocessor">#include <sys/types.h></span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="preprocessor">#include <fcntl.h></span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="preprocessor">#include <sys/stat.h></span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor">#include <sys/ioctl.h></span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="preprocessor">#include <stdlib.h></span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="preprocessor">#include <ctype.h></span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="preprocessor">#include <errno.h></span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="preprocessor">#include <unistd.h></span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> <span class="preprocessor">#include "<a class="code" href="fuse-3_811_80_2example_2ioctl_8h.html">ioctl.h</a>"</span></div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  </div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *usage =</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="stringliteral">"Usage: cuse_client FIOC_FILE COMMAND\n"</span></div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="stringliteral">"\n"</span></div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span> <span class="stringliteral">"COMMANDS\n"</span></div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> <span class="stringliteral">" s [SIZE] : get size if SIZE is omitted, set size otherwise\n"</span></div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span> <span class="stringliteral">" r SIZE [OFF] : read SIZE bytes @ OFF (dfl 0) and output to stdout\n"</span></div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span> <span class="stringliteral">" w SIZE [OFF] : write SIZE bytes @ OFF (dfl 0) from stdin\n"</span></div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span> <span class="stringliteral">"\n"</span>;</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  </div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span> <span class="keyword">static</span> <span class="keywordtype">int</span> do_rw(<span class="keywordtype">int</span> fd, <span class="keywordtype">int</span> is_read, <span class="keywordtype">size_t</span> size, off_t offset,</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordtype">size_t</span> *prev_size, <span class="keywordtype">size_t</span> *new_size)</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> {</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  <span class="keyword">struct </span>fioc_rw_arg arg = { .offset = offset };</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  ssize_t ret;</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>  arg.buf = calloc(1, size);</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">if</span> (!arg.buf) {</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  fprintf(stderr, <span class="stringliteral">"failed to allocated %zu bytes\n"</span>, size);</div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">return</span> -1;</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>  </div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">if</span> (is_read) {</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  arg.size = size;</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  ret = ioctl(fd, FIOC_READ, &arg);</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  <span class="keywordflow">if</span> (ret >= 0)</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  fwrite(arg.buf, 1, ret, stdout);</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  arg.size = fread(arg.buf, 1, size, stdin);</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  fprintf(stderr, <span class="stringliteral">"Writing %zu bytes\n"</span>, arg.size);</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  ret = ioctl(fd, FIOC_WRITE, &arg);</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  }</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  </div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">if</span> (ret >= 0) {</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  *prev_size = arg.prev_size;</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  *new_size = arg.new_size;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  } <span class="keywordflow">else</span></div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  perror(<span class="stringliteral">"ioctl"</span>);</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  </div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  free(arg.buf);</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  <span class="keywordflow">return</span> ret;</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> }</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> <span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span> {</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  <span class="keywordtype">size_t</span> param[2] = { };</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  <span class="keywordtype">size_t</span> size, prev_size = 0, new_size = 0;</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordtype">char</span> cmd;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordtype">int</span> fd, i, rc;</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  </div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">if</span> (argc < 3)</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">goto</span> usage;</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  </div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  fd = open(argv[1], O_RDWR);</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">if</span> (fd < 0) {</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  perror(<span class="stringliteral">"open"</span>);</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  }</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  </div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  cmd = tolower(argv[2][0]);</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  argc -= 3;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  argv += 3;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  </div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">for</span> (i = 0; i < argc; i++) {</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  <span class="keywordtype">char</span> *endp;</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>  param[i] = strtoul(argv[i], &endp, 0);</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">if</span> (endp == argv[i] || *endp != <span class="charliteral">'\0'</span>)</div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  <span class="keywordflow">goto</span> usage;</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  }</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  </div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  <span class="keywordflow">switch</span> (cmd) {</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">case</span> <span class="charliteral">'s'</span>:</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">if</span> (!argc) {</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  <span class="keywordflow">if</span> (ioctl(fd, FIOC_GET_SIZE, &size)) {</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  perror(<span class="stringliteral">"ioctl"</span>);</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  <span class="keywordflow">goto</span> error;</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>  }</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  printf(<span class="stringliteral">"%zu\n"</span>, size);</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  size = param[0];</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  <span class="keywordflow">if</span> (ioctl(fd, FIOC_SET_SIZE, &size)) {</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  perror(<span class="stringliteral">"ioctl"</span>);</div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  <span class="keywordflow">goto</span> error;</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  }</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  }</div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  close(fd);</div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  </div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  <span class="keywordflow">case</span> <span class="charliteral">'r'</span>:</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">case</span> <span class="charliteral">'w'</span>:</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  rc = do_rw(fd, cmd == <span class="charliteral">'r'</span>, param[0], param[1],</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  &prev_size, &new_size);</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  <span class="keywordflow">if</span> (rc < 0)</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keywordflow">goto</span> error;</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  fprintf(stderr, <span class="stringliteral">"transferred %d bytes (%zu -> %zu)\n"</span>,</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  rc, prev_size, new_size);</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  close(fd);</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>  }</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  </div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span> usage:</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>  fprintf(stderr, <span class="stringliteral">"%s"</span>, usage);</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>  </div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span> error:</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>  close(fd);</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>  <span class="keywordflow">return</span> 1;</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span> }</div>
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