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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_ec19dfeb74fc11a3b57e19958e61f7b4.html">lib</a></li> </ul>
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<div class="title">fuse_signals.c</div> </div>
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<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"> Utility functions for setting signal handlers.</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"></span> </div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> This program can be distributed under the terms of the GNU LGPLv2.</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> See the file COPYING.LIB</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">*/</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>  </div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="preprocessor">#include "config.h"</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="preprocessor">#include "fuse_lowlevel.h"</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="preprocessor">#include "fuse_i.h"</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>  </div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="preprocessor">#include <stdio.h></span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#include <string.h></span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor">#include <signal.h></span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#include <stdlib.h></span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>  </div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="keyword">static</span> <span class="keyword">struct </span>fuse_session *fuse_instance;</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>  </div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="keyword">static</span> <span class="keywordtype">void</span> exit_handler(<span class="keywordtype">int</span> sig)</div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> {</div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span>  <span class="keywordflow">if</span> (fuse_instance) {</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>  <a class="code" href="fuse-3_810_84_2include_2fuse__lowlevel_8h.html#a198429f3fbc23ef29ef9971271827690">fuse_session_exit</a>(fuse_instance);</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>  <span class="keywordflow">if</span>(sig <= 0) {</div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>  <a class="code" href="fuse-3_810_84_2include_2fuse__log_8h.html#a4506ffd6ed3a631e01999b32b1eb8621">fuse_log</a>(FUSE_LOG_ERR, <span class="stringliteral">"assertion error: signal value <= 0\n"</span>);</div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>  abort();</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>  }</div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  fuse_instance->error = sig;</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>  }</div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span> }</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  </div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="keyword">static</span> <span class="keywordtype">void</span> do_nothing(<span class="keywordtype">int</span> sig)</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>  (void) sig;</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> }</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> <span class="keyword">static</span> <span class="keywordtype">int</span> set_one_signal_handler(<span class="keywordtype">int</span> sig, <span class="keywordtype">void</span> (*handler)(<span class="keywordtype">int</span>), <span class="keywordtype">int</span> remove)</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="keyword">struct </span>sigaction sa;</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keyword">struct </span>sigaction old_sa;</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>  memset(&sa, 0, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> sigaction));</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  sa.sa_handler = remove ? SIG_DFL : handler;</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  sigemptyset(&(sa.sa_mask));</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  sa.sa_flags = 0;</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  </div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">if</span> (sigaction(sig, NULL, &old_sa) == -1) {</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  perror(<span class="stringliteral">"fuse: cannot get old signal handler"</span>);</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">return</span> -1;</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>  }</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>  <span class="keywordflow">if</span> (old_sa.sa_handler == (remove ? handler : SIG_DFL) &&</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  sigaction(sig, &sa, NULL) == -1) {</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  perror(<span class="stringliteral">"fuse: cannot set signal handler"</span>);</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <span class="keywordflow">return</span> -1;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  }</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>  <span class="keywordflow">return</span> 0;</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>  </div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span> <span class="keywordtype">int</span> <a class="code" href="fuse-3_810_84_2include_2fuse__common_8h.html#a292dccc3c7b1799cb054efa2ba0c774b">fuse_set_signal_handlers</a>(<span class="keyword">struct</span> fuse_session *se)</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="comment">/* If we used SIG_IGN instead of the do_nothing function,</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span> <span class="comment"> then we would be unable to tell if we set SIG_IGN (and</span></div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span> <span class="comment"> thus should reset to SIG_DFL in fuse_remove_signal_handlers)</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span> <span class="comment"> or if it was already set to SIG_IGN (and should be left</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span> <span class="comment"> untouched. */</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <span class="keywordflow">if</span> (set_one_signal_handler(SIGHUP, exit_handler, 0) == -1 ||</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  set_one_signal_handler(SIGINT, exit_handler, 0) == -1 ||</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  set_one_signal_handler(SIGTERM, exit_handler, 0) == -1 ||</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  set_one_signal_handler(SIGPIPE, do_nothing, 0) == -1)</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">return</span> -1;</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  </div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  fuse_instance = se;</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span> }</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  </div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span> <span class="keywordtype">void</span> <a class="code" href="fuse-3_810_84_2include_2fuse__common_8h.html#aeb674bbc11074c4fe520b952d6bfdd30">fuse_remove_signal_handlers</a>(<span class="keyword">struct</span> fuse_session *se)</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span> {</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  <span class="keywordflow">if</span> (fuse_instance != se)</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <a class="code" href="fuse-3_810_84_2include_2fuse__log_8h.html#a4506ffd6ed3a631e01999b32b1eb8621">fuse_log</a>(FUSE_LOG_ERR,</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="stringliteral">"fuse: fuse_remove_signal_handlers: unknown session\n"</span>);</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  <span class="keywordflow">else</span></div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  fuse_instance = NULL;</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>  set_one_signal_handler(SIGHUP, exit_handler, 1);</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  set_one_signal_handler(SIGINT, exit_handler, 1);</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  set_one_signal_handler(SIGTERM, exit_handler, 1);</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  set_one_signal_handler(SIGPIPE, do_nothing, 1);</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span> }</div>
<div class="ttc" id="afuse-3_810_84_2include_2fuse__common_8h_html_a292dccc3c7b1799cb054efa2ba0c774b"><div class="ttname"><a href="fuse-3_810_84_2include_2fuse__common_8h.html#a292dccc3c7b1799cb054efa2ba0c774b">fuse_set_signal_handlers</a></div><div class="ttdeci">int fuse_set_signal_handlers(struct fuse_session *se)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_810_84_2lib_2fuse__signals_8c_source.html#l00062">fuse_signals.c:62</a></div></div>
<div class="ttc" id="afuse-3_810_84_2include_2fuse__common_8h_html_aeb674bbc11074c4fe520b952d6bfdd30"><div class="ttname"><a href="fuse-3_810_84_2include_2fuse__common_8h.html#aeb674bbc11074c4fe520b952d6bfdd30">fuse_remove_signal_handlers</a></div><div class="ttdeci">void fuse_remove_signal_handlers(struct fuse_session *se)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_810_84_2lib_2fuse__signals_8c_source.html#l00079">fuse_signals.c:79</a></div></div>
<div class="ttc" id="afuse-3_810_84_2include_2fuse__log_8h_html_a4506ffd6ed3a631e01999b32b1eb8621"><div class="ttname"><a href="fuse-3_810_84_2include_2fuse__log_8h.html#a4506ffd6ed3a631e01999b32b1eb8621">fuse_log</a></div><div class="ttdeci">void fuse_log(enum fuse_log_level level, const char *fmt,...)</div><div class="ttdef"><b>Definition:</b> <a href="fuse-3_810_84_2lib_2fuse__log_8c_source.html#l00033">fuse_log.c:33</a></div></div>
<div class="ttc" id="afuse-3_810_84_2include_2fuse__lowlevel_8h_html_a198429f3fbc23ef29ef9971271827690"><div class="ttname"><a href="fuse-3_810_84_2include_2fuse__lowlevel_8h.html#a198429f3fbc23ef29ef9971271827690">fuse_session_exit</a></div><div class="ttdeci">void fuse_session_exit(struct fuse_session *se)</div></div>
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