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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=9"/> <meta name="generator" content="Doxygen 1.8.14"/> <meta name="viewport" content="width=device-width, initial-scale=1"/> <title>Ruby: missing/dup2.c Source File</title> <link href="../../tabs.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="../../jquery.js"></script> <script type="text/javascript" src="../../dynsections.js"></script> <link href="../../doxygen.css" rel="stylesheet" type="text/css" /> </head> <body> <div id="top"><!-- do not remove this div, it is closed by doxygen! --> <div id="titlearea"> <table cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 56px;"> <td id="projectalign" style="padding-left: 0.5em;"> <div id="projectname">Ruby  <span id="projectnumber">2.0.0p648(2015-12-16revision53162)</span> </div> </td> </tr> </tbody> </table> </div> <!-- end header part --> <!-- Generated by Doxygen 1.8.14 --> <script type="text/javascript" src="../../menudata.js"></script> <script type="text/javascript" src="../../menu.js"></script> <script type="text/javascript"> /* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */ $(function() { initMenu('../../',false,false,'search.php','Search'); }); /* @license-end */</script> <div id="main-nav"></div> <div id="nav-path" class="navpath"> <ul> <li class="navelem"><a class="el" href="../../dir_f3bfeebb553c3f6ecfb19202628b4493.html">missing</a></li> </ul> </div> </div><!-- top --> <div class="header"> <div class="headertitle"> <div class="title">dup2.c</div> </div> </div><!--header--> <div class="contents"> <a href="../../d0/d25/dup2_8c.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="comment">/*</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> * Public domain dup2() lookalike</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * by Curtis Jackson @ AT&T Technologies, Burlington, NC</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * electronic address: burl!rcj</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> *</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> * dup2 performs the following functions:</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> *</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * Check to make sure that fd1 is a valid open file descriptor.</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * Check to see if fd2 is already open; if so, close it.</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * Duplicate fd1 onto fd2; checking to make sure fd2 is a valid fd.</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> * Return fd2 if all went well; return BADEXIT otherwise.</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> */</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> </div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="preprocessor">#include "ruby/config.h"</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> </div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="preprocessor">#if defined(HAVE_FCNTL)</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="preprocessor"># include <fcntl.h></span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="preprocessor">#endif</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="preprocessor">#if !defined(HAVE_FCNTL) || !defined(F_DUPFD)</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> <span class="preprocessor"># include <errno.h></span></div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> </div><div class="line"><a name="l00024"></a><span class="lineno"><a class="line" href="../../d0/d25/dup2_8c.html#a4b6b8e608c96ef5072046a2b3a475080"> 24</a></span> <span class="preprocessor">#define BADEXIT -1</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> </div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="keywordtype">int</span></div><div class="line"><a name="l00027"></a><span class="lineno"><a class="line" href="../../d0/d25/dup2_8c.html#a4ce97c88892c43f0e127dd3a6dc54b96"> 27</a></span> <a class="code" href="../../d0/d25/dup2_8c.html#a4ce97c88892c43f0e127dd3a6dc54b96">dup2</a>(<span class="keywordtype">int</span> fd1, <span class="keywordtype">int</span> fd2)</div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> {</div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> <span class="preprocessor">#if defined(HAVE_FCNTL) && defined(F_DUPFD)</span></div><div class="line"><a name="l00030"></a><span class="lineno"> 30</span>  <span class="keywordflow">if</span> (fd1 != fd2) {</div><div class="line"><a name="l00031"></a><span class="lineno"> 31</span> <span class="preprocessor">#ifdef F_GETFL</span></div><div class="line"><a name="l00032"></a><span class="lineno"> 32</span>  <span class="keywordflow">if</span> (<a class="code" href="../../dc/db1/win32_8h.html#aa7a55dad56032ce4c5a40eab1d9c8e01">fcntl</a>(fd1, F_GETFL) < 0)</div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span>  <span class="keywordflow">return</span> <a class="code" href="../../d0/d25/dup2_8c.html#a4b6b8e608c96ef5072046a2b3a475080">BADEXIT</a>;</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span>  <span class="keywordflow">if</span> (<a class="code" href="../../dc/db1/win32_8h.html#aa7a55dad56032ce4c5a40eab1d9c8e01">fcntl</a>(fd2, F_GETFL) >= 0)</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  close(fd2);</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  close(fd2);</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  <span class="keywordflow">if</span> (<a class="code" href="../../dc/db1/win32_8h.html#aa7a55dad56032ce4c5a40eab1d9c8e01">fcntl</a>(fd1, <a class="code" href="../../dc/db1/win32_8h.html#ab93a8621587aba90181efd7d3aeea67e">F_DUPFD</a>, fd2) < 0)</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span>  <span class="keywordflow">return</span> <a class="code" href="../../d0/d25/dup2_8c.html#a4b6b8e608c96ef5072046a2b3a475080">BADEXIT</a>;</div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  }</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  <span class="keywordflow">return</span> fd2;</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> <span class="preprocessor">#else</span></div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keyword">extern</span> <span class="keywordtype">int</span> <a class="code" href="../../d4/db0/__sdbm_8c.html#ad65a8842cc674e3ddf69355898c0ecbf">errno</a>;</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  <span class="keywordtype">int</span> <a class="code" href="../../d2/d99/win32ole_8c.html#acb559820d9ca11295b4500f179ef6392">i</a>, fd, fds[256];</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span> </div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  <span class="keywordflow">if</span> (fd1 == fd2) <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span>  close(fd2);</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span>  <span class="keywordflow">for</span> (<a class="code" href="../../d2/d99/win32ole_8c.html#acb559820d9ca11295b4500f179ef6392">i</a>=0; <a class="code" href="../../d2/d99/win32ole_8c.html#acb559820d9ca11295b4500f179ef6392">i</a><256; <a class="code" href="../../d2/d99/win32ole_8c.html#acb559820d9ca11295b4500f179ef6392">i</a>++) {</div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span>  fd = fds[<a class="code" href="../../d2/d99/win32ole_8c.html#acb559820d9ca11295b4500f179ef6392">i</a>] = dup(fd1);</div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span>  <span class="keywordflow">if</span> (fd == fd2) <span class="keywordflow">break</span>;</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>  <span class="keywordflow">while</span> (<a class="code" href="../../d2/d99/win32ole_8c.html#acb559820d9ca11295b4500f179ef6392">i</a>) {</div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span>  close(fds[<a class="code" href="../../d2/d99/win32ole_8c.html#acb559820d9ca11295b4500f179ef6392">i</a>--]);</div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span>  }</div><div class="line"><a name="l00056"></a><span class="lineno"> 56</span>  <span class="keywordflow">if</span> (fd == fd2) <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00057"></a><span class="lineno"> 57</span>  <a class="code" href="../../d4/db0/__sdbm_8c.html#ad65a8842cc674e3ddf69355898c0ecbf">errno</a> = EMFILE;</div><div class="line"><a name="l00058"></a><span class="lineno"> 58</span>  <span class="keywordflow">return</span> <a class="code" href="../../d0/d25/dup2_8c.html#a4b6b8e608c96ef5072046a2b3a475080">BADEXIT</a>;</div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="preprocessor">#endif</span></div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> }</div><div class="ttc" id="win32ole_8c_html_acb559820d9ca11295b4500f179ef6392"><div class="ttname"><a href="../../d2/d99/win32ole_8c.html#acb559820d9ca11295b4500f179ef6392">i</a></div><div class="ttdeci">int i</div><div class="ttdef"><b>Definition:</b> <a href="../../d2/d99/win32ole_8c_source.html#l00784">win32ole.c:784</a></div></div> <div class="ttc" id="win32_8h_html_ab93a8621587aba90181efd7d3aeea67e"><div class="ttname"><a href="../../dc/db1/win32_8h.html#ab93a8621587aba90181efd7d3aeea67e">F_DUPFD</a></div><div class="ttdeci">#define F_DUPFD</div><div class="ttdef"><b>Definition:</b> <a href="../../dc/db1/win32_8h_source.html#l00581">win32.h:581</a></div></div> <div class="ttc" id="win32_8h_html_aa7a55dad56032ce4c5a40eab1d9c8e01"><div class="ttname"><a href="../../dc/db1/win32_8h.html#aa7a55dad56032ce4c5a40eab1d9c8e01">fcntl</a></div><div class="ttdeci">int fcntl(int, int,...)</div><div class="ttdef"><b>Definition:</b> <a href="../../d5/df2/win32_8c_source.html#l03845">win32.c:3845</a></div></div> <div class="ttc" id="dup2_8c_html_a4ce97c88892c43f0e127dd3a6dc54b96"><div class="ttname"><a href="../../d0/d25/dup2_8c.html#a4ce97c88892c43f0e127dd3a6dc54b96">dup2</a></div><div class="ttdeci">int dup2(int fd1, int fd2)</div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d25/dup2_8c_source.html#l00027">dup2.c:27</a></div></div> <div class="ttc" id="__sdbm_8c_html_ad65a8842cc674e3ddf69355898c0ecbf"><div class="ttname"><a href="../../d4/db0/__sdbm_8c.html#ad65a8842cc674e3ddf69355898c0ecbf">errno</a></div><div class="ttdeci">int errno</div></div> <div class="ttc" id="dup2_8c_html_a4b6b8e608c96ef5072046a2b3a475080"><div class="ttname"><a href="../../d0/d25/dup2_8c.html#a4b6b8e608c96ef5072046a2b3a475080">BADEXIT</a></div><div class="ttdeci">#define BADEXIT</div><div class="ttdef"><b>Definition:</b> <a href="../../d0/d25/dup2_8c_source.html#l00024">dup2.c:24</a></div></div> </div><!-- fragment --></div><!-- contents --> <!-- start footer part --> <hr class="footer"/><address class="footer"><small> Generated by  <a href="http://www.doxygen.org/index.html"> <img class="footer" src="../../doxygen.png" alt="doxygen"/> </a> 1.8.14 </small></address> </body> </html>