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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>pclose</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_007_955"> </a>NAME</h4><blockquote>pclose - close a pipe stream to or from a process</blockquote><h4><a name = "tag_000_007_956"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="stdio.h.html">stdio.h</a>>int pclose(FILE *<i>stream</i>);</code></pre></blockquote><h4><a name = "tag_000_007_957"> </a>DESCRIPTION</h4><blockquote>The<i>pclose()</i>function closes a stream that was opened by<i><a href="popen.html">popen()</a></i>,waits for the command to terminate, and returns the termination statusof the process that was running the command language interpreter.However, if a call caused the termination status to be unavailable to<i>pclose()</i>,then<i>pclose()</i>returns -1 with<i>errno</i>set to[ECHILD]to report this situation; this can happen if the application calls one of thefollowing functions:<ul><p><li><i><a href="wait.html">wait()</a></i><p><li><i><a href="waitpid.html">waitpid()</a></i>with a<i>pid</i>argument less than or equal to 0 or equal to the process ID of the commandline interpreter<p><li>any other function not defined in this specification that could do one of theabove.<p></ul><p>In any case,<i>pclose()</i>will not return before the child process created by<i><a href="popen.html">popen()</a></i>has terminated.<p>If the command language interpreter cannot be executed, thechild termination status returned by<i>pclose()</i>will be as if the command language interpreter terminated using<i>exit</i>(127)or<i>_exit</i>(127).<p>The<i>pclose()</i>function will not affect the termination status of any child of thecalling process other than the one created by<i><a href="popen.html">popen()</a></i>for the associated stream.<p>If the argument<i>stream</i>to<i>pclose()</i>is not a pointer to a stream created by<i><a href="popen.html">popen()</a></i>,the result of<i>pclose()</i>is undefined.</blockquote><h4><a name = "tag_000_007_958"> </a>RETURN VALUE</h4><blockquote>Upon successful return,<i>pclose()</i>returns the termination status of the command language interpreter.Otherwise,<i>pclose()</i>returns -1 and sets<i>errno</i>to indicate the error.</blockquote><h4><a name = "tag_000_007_959"> </a>ERRORS</h4><blockquote>The<i>pclose()</i>function will fail if:<dl compact><dt>[ECHILD]<dd>The status of the child process could not be obtained,as described above.</dl></blockquote><h4><a name = "tag_000_007_960"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_961"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_962"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_963"> </a>SEE ALSO</h4><blockquote><i><a href="fork.html">fork()</a></i>,<i><a href="popen.html">popen()</a></i>,<i><a href="waitpid.html">waitpid()</a></i>,<i><a href="stdio.h.html"><stdio.h></a></i>.<br></blockquote><h4>DERIVATION</h4><blockquote>Derived from Issue 1 of the SVID.</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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