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<a href="nsutils_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="preprocessor">#ifndef LIBNAGIOS_NSUTILS_H_INCLUDED</span></div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define LIBNAGIOS_NSUTILS_H_INCLUDED</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#include &lt;sys/types.h&gt;</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="preprocessor">#include &lt;sys/time.h&gt;</span></div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> * @file nsutils.h</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> * @brief Non-Standard (or Nagios) utility functions and macros.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment"> * This is where we house all helpers and macros that fall outside</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment"> * the &quot;standard-ish&quot; norm. The prefixes &quot;nsu_&quot; and NSU_ are</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment"> * reserved for this purpose, so we avoid clashing with other</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment"> * applications that may have similarly-acting functions with</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment"> * identical names.</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment"> * The functions already here lack the nsu_ prefix for backwards</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="comment"> * compatibility reasons. It&#39;s possible we&#39;ll have to fix that</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="comment"> * some day, but let&#39;s leave that for later.</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="comment"> * @{</span></div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment">/** Macro for dynamically increasing vector lengths */</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"><a class="line" href="nsutils_8h.html#a96824974fc1cbb6da7418f3ac5e4d57d">   24</a></span>&#160;<span class="preprocessor">#define alloc_nr(x) (((x)+16)*3/2)</span></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="preprocessor"></span><span class="comment"></span></div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;<span class="comment"> * Check if a number is a power of 2</span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;<span class="comment"> * @param x The number to check</span></div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;<span class="comment"> * @return 1 if the number is a power of 2, 0 if it&#39;s not</span></div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">int</span> nsu_ispow2(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> x)</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;{</div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;    <span class="keywordflow">return</span> x &gt; 1 ? !(x &amp; (x - 1)) : 0;</div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;}</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;<span class="comment"> * Round up to a power of 2</span></div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;<span class="comment"> * Yes, this is the most cryptic function name in all of Nagios, but I</span></div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;<span class="comment"> * like it, so shush.</span></div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;<span class="comment"> * @param r The number to round up</span></div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;<span class="comment"> * @return r, rounded up to the nearest power of 2.</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> rup2pof2(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> r)</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;{</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;    r--;</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;    <span class="keywordflow">if</span> (!r)</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;        <span class="keywordflow">return</span> 2;</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;    r |= r &gt;&gt; 1;</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;    r |= r &gt;&gt; 2;</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;    r |= r &gt;&gt; 4;</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;    r |= r &gt;&gt; 8;</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;    r |= r &gt;&gt; 16;</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;    <span class="keywordflow">return</span> r + 1;</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;}</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="comment"> * Grab a random unsigned int in the range between low and high.</span></div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="comment"> * Note that the PRNG has to be seeded prior to calling this.</span></div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<span class="comment"> * @param low The lower bound, inclusive</span></div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="comment"> * @param high The higher bound, inclusive</span></div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="comment"> * @return An unsigned integer in the mathematical range [low, high]</span></div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="keyword">static</span> <span class="keyword">inline</span> <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> ranged_urand(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> low, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> high)</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;{</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;    <span class="keywordflow">return</span> low + (rand() * (1.0 / (RAND_MAX + 1.0)) * (high - low));</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;}</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="comment"> * Get number of online cpus</span></div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="comment"> * @return Active cpu cores detected on success. 0 on failure.</span></div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="keyword">extern</span> <span class="keywordtype">int</span> <a class="code" href="nsutils_8h.html#a7674c6154264b62f100ad41863e64dee">real_online_cpus</a>(<span class="keywordtype">void</span>);</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="comment"> * Wrapper for real_online_cpus(), returning 1 in case we can&#39;t</span></div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;<span class="comment"> * detect any active cpus.</span></div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;<span class="comment"> * @return Number of active cpu cores on success. 1 on failure.</span></div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;<span class="keyword">extern</span> <span class="keywordtype">int</span> <a class="code" href="nsutils_8h.html#a60a5912bf88ddfa4c6cbf1faa0b2ef9a">online_cpus</a>(<span class="keywordtype">void</span>);</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;<span class="comment"> * Create a short-lived string in stack-allocated memory</span></div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;<span class="comment"> * The number and size of strings is limited (currently to 256 strings of</span></div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;<span class="comment"> * 32 bytes each), so beware and use this sensibly. Intended for</span></div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;<span class="comment"> * number-to-string conversion and other short strings.</span></div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<span class="comment"> * @note The returned string must *not* be free()&#39;d!</span></div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;<span class="comment"> * @param[in] fmt The format string</span></div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;<span class="comment"> * @return A pointer to the formatted string on success. Undefined on errors</span></div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;<span class="keyword">extern</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a class="code" href="nsutils_8h.html#a48c79bbb0b4bb978a529835c3b17d6a2">mkstr</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *fmt, ...)</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;    __attribute__((__format__(__printf__, 1, 2)));</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;<span class="comment"> * Calculate the millisecond delta between two timeval structs</span></div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;<span class="comment"> * @param[in] start The start time</span></div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;<span class="comment"> * @param[in] stop The stop time</span></div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;<span class="comment"> * @return The millisecond delta between the two structs</span></div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;extern <span class="keywordtype">int</span> <a class="code" href="nsutils_8h.html#a89bdd94baabcc0743a916ef7fcf75532">tv_delta_msec</a>(const struct timeval *start, const struct timeval *stop);</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;<span class="comment"> * Get timeval delta as seconds</span></div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;<span class="comment"> * @param start The start time</span></div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;<span class="comment"> * @param stop The stop time</span></div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;<span class="comment"> * @return time difference in fractions of seconds</span></div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;extern <span class="keywordtype">float</span> <a class="code" href="nsutils_8h.html#a231490982ef814eed7b04ba16edc5520">tv_delta_f</a>(const struct timeval *start, const struct timeval *stop);</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;<span class="comment">/** @} */</span></div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;<span class="preprocessor">#endif </span><span class="comment">/* LIBNAGIOS_NSUTILS_H_INCLUDED */</span><span class="preprocessor"></span></div>
<div class="ttc" id="nsutils_8h_html_a48c79bbb0b4bb978a529835c3b17d6a2"><div class="ttname"><a href="nsutils_8h.html#a48c79bbb0b4bb978a529835c3b17d6a2">mkstr</a></div><div class="ttdeci">const char * mkstr(const char *fmt,...) __attribute__((__format__(__printf__</div><div class="ttdoc">Create a short-lived string in stack-allocated memory The number and size of strings is limited (curr...</div></div>
<div class="ttc" id="nsutils_8h_html_a231490982ef814eed7b04ba16edc5520"><div class="ttname"><a href="nsutils_8h.html#a231490982ef814eed7b04ba16edc5520">tv_delta_f</a></div><div class="ttdeci">float tv_delta_f(const struct timeval *start, const struct timeval *stop)</div><div class="ttdoc">Get timeval delta as seconds. </div></div>
<div class="ttc" id="nsutils_8h_html_a89bdd94baabcc0743a916ef7fcf75532"><div class="ttname"><a href="nsutils_8h.html#a89bdd94baabcc0743a916ef7fcf75532">tv_delta_msec</a></div><div class="ttdeci">const char int tv_delta_msec(const struct timeval *start, const struct timeval *stop)</div><div class="ttdoc">Calculate the millisecond delta between two timeval structs. </div></div>
<div class="ttc" id="nsutils_8h_html_a7674c6154264b62f100ad41863e64dee"><div class="ttname"><a href="nsutils_8h.html#a7674c6154264b62f100ad41863e64dee">real_online_cpus</a></div><div class="ttdeci">int real_online_cpus(void)</div><div class="ttdoc">Get number of online cpus. </div></div>
<div class="ttc" id="nsutils_8h_html_a60a5912bf88ddfa4c6cbf1faa0b2ef9a"><div class="ttname"><a href="nsutils_8h.html#a60a5912bf88ddfa4c6cbf1faa0b2ef9a">online_cpus</a></div><div class="ttdeci">int online_cpus(void)</div><div class="ttdoc">Wrapper for real_online_cpus(), returning 1 in case we can&amp;#39;t detect any active cpus. </div></div>
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