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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>free</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_005_239"> </a>NAME</h4><blockquote>free - free allocated memory</blockquote><h4><a name = "tag_000_005_240"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="stdlib.h.html">stdlib.h</a>>void free(void *<i>ptr</i>);</code></pre></blockquote><h4><a name = "tag_000_005_241"> </a>DESCRIPTION</h4><blockquote>The<i>free()</i>function causes the space pointed to by<i>ptr</i>to be deallocated; that is, made available for further allocation.If<i>ptr</i>is a null pointer, no action occurs.Otherwise, if the argument does not match a pointer earlierreturned by the<i><a href="calloc.html">calloc()</a></i>,<i><a href="malloc.html">malloc()</a></i>,<i><a href="realloc.html">realloc()</a></i>or<i><a href="valloc.html">valloc()</a></i>function, or if the space is deallocated by a call to<i>free()</i>or<i><a href="realloc.html">realloc()</a></i>,the behaviour is undefined.<p>Any use of a pointer that refers to freed space causes undefinedbehaviour.</blockquote><h4><a name = "tag_000_005_242"> </a>RETURN VALUE</h4><blockquote>The<i>free()</i>function returns no value.</blockquote><h4><a name = "tag_000_005_243"> </a>ERRORS</h4><blockquote>No errors are defined.</blockquote><h4><a name = "tag_000_005_244"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_005_245"> </a>APPLICATION USAGE</h4><blockquote>There is now no requirement for the implementation to supportthe inclusion of<i><malloc.h></i>.</blockquote><h4><a name = "tag_000_005_246"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_005_247"> </a>SEE ALSO</h4><blockquote><i><a href="calloc.html">calloc()</a></i>,<i><a href="malloc.html">malloc()</a></i>,<i><a href="realloc.html">realloc()</a></i>,<i><a href="stdlib.h.html"><stdlib.h></a></i>.</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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