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<a href="XrdPosixCallBack_8hh.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="preprocessor">#ifndef __POSIX_CALLBACK_HH__</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="preprocessor"></span><span class="preprocessor">#define __POSIX_CALLBACK_HH__</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="preprocessor"></span><span class="comment">/******************************************************************************/</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">/* X r d P o s i x C a l l B a c k . h h */</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">/* (c) 2010 by the Board of Trustees of the Leland Stanford, Jr., University */</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment">/* All Rights Reserved */</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment">/* Produced by Andrew Hanushevsky for Stanford University under contract */</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment">/* DE-AC02-76-SFO0515 with the Department of Energy */</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment">/* */</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment">/* This file is part of the XRootD software suite. */</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment">/* */</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment">/* XRootD is free software: you can redistribute it and/or modify it under */</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment">/* the terms of the GNU Lesser General Public License as published by the */</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment">/* Free Software Foundation, either version 3 of the License, or (at your */</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment">/* option) any later version. */</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment">/* */</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment">/* XRootD is distributed in the hope that it will be useful, but WITHOUT */</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment">/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="comment">/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public */</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="comment">/* License for more details. */</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="comment">/* */</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="comment">/* You should have received a copy of the GNU Lesser General Public License */</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="comment">/* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="comment">/* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="comment">/* */</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span> <span class="comment">/* The copyright holder's institutional names and contributor's names may not */</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="comment">/* be used to endorse or promote products derived from this software without */</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span> <span class="comment">/* specific prior written permission of the institution or contributor. */</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="comment">/******************************************************************************/</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> <span class="comment">// This abstract class defines the callback interface for file open() calls.</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span> <span class="comment">// It is passed when using the XrdPosixXrootd::Open() call. When passed, the</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span> <span class="comment">// open request will be done in the background. When a callback object is</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="comment">// supplied, Open() will *always* return -1. However, if started successfully,</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span> <span class="comment">// Open() will return -1 with errno set to EINPROGRESS. Otherwise, errno will</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="comment">// contain the reason the Open() request immediately failed. Upon completion,</span></div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span> <span class="comment">// the callback's Compete() method is invoked. The Result parameter will either</span></div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span> <span class="comment">// be a non-negative file descriptor or -errno indicating that the Open()</span></div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span> <span class="comment">// failed. Note that the caller is responsible for deleting the callback object</span></div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span> <span class="comment">// after it has been invoked. Note that callbacks will be executed in a</span></div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="comment">// separate thread unless open() is called with O_SYNC or maxThreads is zero.</span></div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span> <span class="comment">// WARNING: If O_SYNC or maxThreads is zero, then the callback must *not*</span></div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span> <span class="comment">// issue any filesystem calls using the supplied file descriptor.</span></div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span> <span class="comment">// Ignoring this will produce undetermined results including possible</span></div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span> <span class="comment">// deadlock. Synchrnous callbacks are only meant to support private</span></div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span> <span class="comment">// thread management.</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"> 49</span> </div>
<div class="line"><a name="l00050"></a><span class="lineno"><a class="code" href="classXrdPosixCallBack.html"> 50</a></span> <span class="keyword">class </span><a class="code" href="classXrdPosixCallBack.html">XrdPosixCallBack</a></div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span> {</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="keyword">public</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="keyword">virtual</span> <span class="keywordtype">void</span> <a class="code" href="classXrdPosixCallBack.html#ab3111fe27859aa4ae465a073b13795a9">Complete</a>(<span class="keywordtype">int</span> Result) = 0;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div>
<div class="line"><a name="l00056"></a><span class="lineno"><a class="code" href="classXrdPosixCallBack.html#ae9a770bbe9c3b8ebb3e8e675d4ffcbdc"> 56</a></span>  <a class="code" href="classXrdPosixCallBack.html#ae9a770bbe9c3b8ebb3e8e675d4ffcbdc">XrdPosixCallBack</a>() {}</div>
<div class="line"><a name="l00057"></a><span class="lineno"><a class="code" href="classXrdPosixCallBack.html#a675a9929705b9f65ed60589839aa23a2"> 57</a></span> <span class="keyword">virtual</span> <a class="code" href="classXrdPosixCallBack.html#a675a9929705b9f65ed60589839aa23a2">~XrdPosixCallBack</a>() {}</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="preprocessor">#endif</span></div>
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