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<a href="runcmd_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 NDO_LIBNAGIOS_RUNCMD_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 NDO_LIBNAGIOS_RUNCMD_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;signal.h&gt;</span></div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="comment"></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"> * @file runcmd.h</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> * @brief runcmd library function declarations</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> * A simple interface to executing programs from other programs, using an</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment"> * optimized and safer popen()-like implementation. It is considered safer in</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment"> * that no shell needs to be spawned for simple commands, and the environment</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment"> * passed to the execve()&#39;d program is essentially empty.</span></div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment"> * This code is based on popen.c, which in turn was taken from</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;<span class="comment"> * &quot;Advanced Programming in the UNIX Environment&quot; by W. Richard Stevens.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="comment"> * Care has been taken to make sure the functions are async-safe. The exception</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="comment"> * is runcmd_init() which multithreaded applications or plugins must call in a</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="comment"> * non-reentrant manner before calling any other runcmd function.</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"> * @note This is inherited from the nagiosplugins project, although</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="comment"> * it might need refactoring for performance later.</span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment"> * @{</span></div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;<span class="comment">/** Return code bitflags for runcmd_cmd2strv() */</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"><a class="line" href="runcmd_8h.html#a137b2e453f35e694292e3c9c26222dea">   27</a></span>&#160;<span class="preprocessor">#define RUNCMD_HAS_REDIR (1 &lt;&lt; 0) </span><span class="comment">/**&lt; I/O redirection */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00028"></a><span class="lineno"><a class="line" href="runcmd_8h.html#a627d7784a16a94482628b40989fc6fd0">   28</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define RUNCMD_HAS_SUBCOMMAND  (1 &lt;&lt; 1) </span><span class="comment">/**&lt; subcommands present */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00029"></a><span class="lineno"><a class="line" href="runcmd_8h.html#a7c1913db9537a97d1eaf36dd571a9a89">   29</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define RUNCMD_HAS_PAREN (1 &lt;&lt; 2) </span><span class="comment">/**&lt; parentheses present in command */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00030"></a><span class="lineno"><a class="line" href="runcmd_8h.html#accc702fcefbca1c9fcfb4d6250c301cf">   30</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define RUNCMD_HAS_JOBCONTROL (1 &lt;&lt; 3) </span><span class="comment">/**&lt; job control stuff present */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00031"></a><span class="lineno"><a class="line" href="runcmd_8h.html#a282866d10a90c2ce1f6e12c1b6f3b35a">   31</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define RUNCMD_HAS_UBSQ (1 &lt;&lt; 4) </span><span class="comment">/**&lt; unbalanced single quotes */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00032"></a><span class="lineno"><a class="line" href="runcmd_8h.html#a3a09e28c161575948fd3e23bbc0fe62f">   32</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define RUNCMD_HAS_UBDQ (1 &lt;&lt; 5) </span><span class="comment">/**&lt; unbalanced double quotes */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00033"></a><span class="lineno"><a class="line" href="runcmd_8h.html#a7604776ddc73f8fa2e32c4cc88499557">   33</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define RUNCMD_HAS_WILDCARD (1 &lt;&lt; 6) </span><span class="comment">/**&lt; wildcards present */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00034"></a><span class="lineno"><a class="line" href="runcmd_8h.html#a8ff4773f5388adbf6811f83e7cb24590">   34</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define RUNCMD_HAS_SHVAR    (1 &lt;&lt; 7) </span><span class="comment">/**&lt; shell variables present */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;</div>
<div class="line"><a name="l00037"></a><span class="lineno"><a class="line" href="runcmd_8h.html#a809d1418175a99f46a35070f5b59e6e2">   37</a></span>&#160;<span class="preprocessor">#define RUNCMD_EFD    (-1)  </span><span class="comment">/**&lt; Failed to pipe() or open() */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00038"></a><span class="lineno"><a class="line" href="runcmd_8h.html#ad8ffc6efe0e7c45e4df5b5f8e64f4139">   38</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define RUNCMD_EALLOC (-2)  </span><span class="comment">/**&lt; Failed to alloc */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00039"></a><span class="lineno"><a class="line" href="runcmd_8h.html#a08a1e2d5ee5aea3289e3f73116acda32">   39</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define RUNCMD_ECMD   (-3)  </span><span class="comment">/**&lt; Bad command */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00040"></a><span class="lineno"><a class="line" href="runcmd_8h.html#ad6f804d34b23a2b0ce80d0f4e984f9a8">   40</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define RUNCMD_EFORK  (-4)  </span><span class="comment">/**&lt; Failed to fork() */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00041"></a><span class="lineno"><a class="line" href="runcmd_8h.html#a049ff19afdd6870b63cfaeaf3bfb4119">   41</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define RUNCMD_EINVAL (-5)  </span><span class="comment">/**&lt; Invalid parameters */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00042"></a><span class="lineno"><a class="line" href="runcmd_8h.html#ab45ee0914807f380887acf8d78c197a9">   42</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define RUNCMD_EWAIT  (-6)  </span><span class="comment">/**&lt; Failed to wait() */</span><span class="preprocessor"></span></div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;<span class="preprocessor"></span><span class="comment"></span></div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;<span class="comment"> * Initialize the runcmd library.</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;<span class="comment"> * Only multi-threaded programs that might launch the first external</span></div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;<span class="comment"> * program from multiple threads simultaneously need to bother with</span></div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;<span class="comment"> * this, and they must ensure this is called at least once in a non-reentrant</span></div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;<span class="comment"> * manner before calling any other runcmd function.</span></div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;<span class="keyword">extern</span> <span class="keywordtype">void</span> <a class="code" href="runcmd_8h.html#ae3353ec3d6496563eff990f1f8f41b2f">runcmd_init</a>(<span class="keywordtype">void</span>);</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="comment"> * Return pid of a command with a specific file descriptor</span></div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;<span class="comment"> * @param[in] fd stdout filedescriptor of the child to get pid from</span></div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;<span class="comment"> * @return pid of the child, or 0 on errors</span></div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;<span class="keyword">extern</span> pid_t <a class="code" href="runcmd_8h.html#abaa915421b65f5c0f386cae83d43f776">runcmd_pid</a>(<span class="keywordtype">int</span> fd);</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;<span class="comment"> * Return explanation of which system call or operation failed</span></div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;<span class="comment"> * @param code Error code returned by a library function</span></div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;<span class="comment"> * @return A non-free()&#39;able string explaining where the error occurred</span></div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;<span class="keyword">extern</span> <span class="keyword">const</span> <span class="keywordtype">char</span> *<a class="code" href="runcmd_8h.html#ac264bd14731ff4521acaee5d505f85ec">runcmd_strerror</a>(<span class="keywordtype">int</span> code);</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;<span class="comment"></span></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"> * Start a command from a command string</span></div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;<span class="comment"> * @param[in] cmd The command to launch</span></div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;<span class="comment"> * @param[out] pfd Child&#39;s stdout filedescriptor</span></div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;<span class="comment"> * @param[out] pfderr Child&#39;s stderr filedescriptor</span></div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;<span class="comment"> * @param[in] env Currently ignored for portability</span></div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;<span class="comment"> * @param[in] iobreg The callback function to register the iobrokers for the read ends of the pipe</span></div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;<span class="comment"> * @param[in] iobregarg The &quot;arg&quot; value to pass to iobroker_register()</span></div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;<span class="keyword">extern</span> <span class="keywordtype">int</span> <a class="code" href="runcmd_8h.html#a941bffadcd8ec578e93216d144097856">runcmd_open</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *cmd, <span class="keywordtype">int</span> *pfd, <span class="keywordtype">int</span> *pfderr, <span class="keywordtype">char</span> **env,</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;        <span class="keywordtype">void</span> (*iobreg)(<span class="keywordtype">int</span>, <span class="keywordtype">int</span>, <span class="keywordtype">void</span> *), <span class="keywordtype">void</span> *iobregarg);</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="comment">/**</span></div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;<span class="comment"> * Close a command and return its exit status</span></div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;<span class="comment"> * @note Don&#39;t use this. It&#39;s a retarded way to reap children suitable</span></div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;<span class="comment"> * only for launching a one-shot program.</span></div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;<span class="comment"> * @param[in] fd The child&#39;s stdout filedescriptor</span></div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;<span class="comment"> * @return exit-status of the child, or -1 in case of errors</span></div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;<span class="keyword">extern</span> <span class="keywordtype">int</span> <a class="code" href="runcmd_8h.html#aca041c180a0e52fce527197923aa7834">runcmd_close</a>(<span class="keywordtype">int</span> fd);</div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;<span class="comment"></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="comment"> * Convert a string to a vector of arguments like a shell would</span></div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;<span class="comment"> * @note This might have bugs and is only tested to behave similar</span></div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;<span class="comment"> * to how /bin/sh does things. For csh or other non bash-ish shells</span></div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;<span class="comment"> * there are no guarantees.</span></div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;<span class="comment"> * @note The out_argv array has to be large enough to hold all strings</span></div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;<span class="comment"> * found in the command.</span></div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;<span class="comment"> * @param[in] str The string to convert to an argument vector</span></div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;<span class="comment"> * @param[out] out_argc The number of arguments found</span></div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;<span class="comment"> * @param[out] out_argv The argument vector</span></div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;<span class="comment"> * @return 0 on (great) success, or a bitmask of failure-codes</span></div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;<span class="comment"> * representing f.e. unclosed quotes, job control or output redirection.</span></div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;<span class="comment"> * See the RUNCMD_HAS_* and their ilk to find out about the flag.</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="keyword">extern</span> <span class="keywordtype">int</span> <a class="code" href="runcmd_8h.html#aca907b3c82a3885186b590f44a758079">runcmd_cmd2strv</a>(<span class="keyword">const</span> <span class="keywordtype">char</span> *str, <span class="keywordtype">int</span> *out_argc, <span class="keywordtype">char</span> **out_argv);</div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;<span class="comment"> * If you&#39;re using libnagios to execute a remote command, the </span></div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;<span class="comment"> * static pid_t pids is not freed after runcmd_open</span></div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;<span class="comment"> * You can call this function when you&#39;re sure pids is no longer</span></div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;<span class="comment"> * in use, to keep down memory leaks</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="keyword">extern</span> <span class="keywordtype">void</span> <a class="code" href="runcmd_8h.html#a89517237851fef77721db7aef7b87955">runcmd_free_pids</a>(<span class="keywordtype">void</span>);</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;<span class="comment"></span></div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;<span class="comment">/** @} */</span></div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;<span class="comment">/* INCLUDE_runcmd_h__ */</span></div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;<span class="preprocessor">#endif</span></div>
<div class="ttc" id="runcmd_8h_html_ac264bd14731ff4521acaee5d505f85ec"><div class="ttname"><a href="runcmd_8h.html#ac264bd14731ff4521acaee5d505f85ec">runcmd_strerror</a></div><div class="ttdeci">const char * runcmd_strerror(int code)</div><div class="ttdoc">Return explanation of which system call or operation failed. </div></div>
<div class="ttc" id="runcmd_8h_html_aca041c180a0e52fce527197923aa7834"><div class="ttname"><a href="runcmd_8h.html#aca041c180a0e52fce527197923aa7834">runcmd_close</a></div><div class="ttdeci">int runcmd_close(int fd)</div><div class="ttdoc">Close a command and return its exit status. </div></div>
<div class="ttc" id="runcmd_8h_html_ae3353ec3d6496563eff990f1f8f41b2f"><div class="ttname"><a href="runcmd_8h.html#ae3353ec3d6496563eff990f1f8f41b2f">runcmd_init</a></div><div class="ttdeci">void runcmd_init(void)</div><div class="ttdoc">Initialize the runcmd library. </div></div>
<div class="ttc" id="runcmd_8h_html_aca907b3c82a3885186b590f44a758079"><div class="ttname"><a href="runcmd_8h.html#aca907b3c82a3885186b590f44a758079">runcmd_cmd2strv</a></div><div class="ttdeci">int runcmd_cmd2strv(const char *str, int *out_argc, char **out_argv)</div><div class="ttdoc">Convert a string to a vector of arguments like a shell would. </div></div>
<div class="ttc" id="runcmd_8h_html_a941bffadcd8ec578e93216d144097856"><div class="ttname"><a href="runcmd_8h.html#a941bffadcd8ec578e93216d144097856">runcmd_open</a></div><div class="ttdeci">int runcmd_open(const char *cmd, int *pfd, int *pfderr, char **env, void(*iobreg)(int, int, void *), void *iobregarg)</div><div class="ttdoc">Start a command from a command string. </div></div>
<div class="ttc" id="runcmd_8h_html_abaa915421b65f5c0f386cae83d43f776"><div class="ttname"><a href="runcmd_8h.html#abaa915421b65f5c0f386cae83d43f776">runcmd_pid</a></div><div class="ttdeci">pid_t runcmd_pid(int fd)</div><div class="ttdoc">Return pid of a command with a specific file descriptor. </div></div>
<div class="ttc" id="runcmd_8h_html_a89517237851fef77721db7aef7b87955"><div class="ttname"><a href="runcmd_8h.html#a89517237851fef77721db7aef7b87955">runcmd_free_pids</a></div><div class="ttdeci">void runcmd_free_pids(void)</div><div class="ttdoc">If you&amp;#39;re using libnagios to execute a remote command, the static pid_t pids is not freed after runcm...</div></div>
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