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<a href="nwrite_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_NWRITE_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_NWRITE_H_INCLUDED</span></div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="preprocessor"></span><span class="comment"></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"> * @file nwrite.h</span></div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="comment"> * @brief Functions that properly handle incomplete write()&#39;s</span></div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="comment"> *</span></div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;<span class="comment"> * Some functions simply use write() to send data through a socket.</span></div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="comment"> * These calls are sometimes interrupted, especially in the case of</span></div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="comment"> * an overly large buffer. Even though the write() _could_ finish,</span></div>
<div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;<span class="comment"> * the incomplete write is treated as an error. The functions here</span></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="comment"> * properly handle those cases.</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"> * @{</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"></span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="comment">/**</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="comment"> * Send data through a socket</span></div>
<div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;<span class="comment"> * This function will send data through a socket and return</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;<span class="comment"> * the number of bytes written.</span></div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;<span class="comment"> * @param sock The socket to write to</span></div>
<div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;<span class="comment"> * @param data The data to write</span></div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;<span class="comment"> * @param lth The length of the data</span></div>
<div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;<span class="comment"> * @param sent The number of bytes written (can be NULL)</span></div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;<span class="comment"> * @return The number of bytes written or -1 if error</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="keyword">static</span> <span class="keyword">inline</span> ssize_t nwrite(<span class="keywordtype">int</span> fd, <span class="keyword">const</span> <span class="keywordtype">void</span> *buf, <span class="keywordtype">size_t</span> count, ssize_t *written)</div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;{</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;    <span class="comment">/*</span></div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;<span class="comment">     * Given the API we have to assume (unsigned) size_t &#39;count&#39; fits into</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;<span class="comment">     * a (signed) ssize_t because we can&#39;t return a larger value.</span></div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;<span class="comment">     * https://stackoverflow.com/questions/29722999/will-write2-always-write-less-than-or-equal-to-ssize-max</span></div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;<span class="comment">     */</span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;    ssize_t out, tot = 0;</div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;</div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;    <span class="keywordflow">if</span> (!buf || count == 0)</div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;        <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;</div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;    <span class="keywordflow">while</span> ((<span class="keywordtype">size_t</span>) tot &lt; count) {</div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;        out = write(fd, (<span class="keyword">const</span> <span class="keywordtype">char</span> *) buf + tot, count - tot);</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;        <span class="keywordflow">if</span> (out &gt; 0)</div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;            tot += out;</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;        <span class="keywordflow">else</span> <span class="keywordflow">if</span>(errno == EAGAIN || errno == EINTR)</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;            <span class="keywordflow">continue</span>;</div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;        <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;            <span class="keywordflow">if</span> (written)</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;                *written = tot;</div>
<div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;            <span class="keywordflow">return</span> out;</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;        }</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;    }</div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;    <span class="keywordflow">if</span> (written)</div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;        *written = tot;</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;    <span class="keywordflow">return</span> tot;</div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;}</div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;<span class="comment"></span></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="preprocessor">#endif </span><span class="comment">/* LIBNAGIOS_NWRITE_H_INCLUDED */</span><span class="preprocessor"></span></div>
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