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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>malloc</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_496"> </a>NAME</h4><blockquote>malloc - a memory allocator</blockquote><h4><a name = "tag_000_007_497"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="stdlib.h.html">stdlib.h</a>>void *malloc(size_t <i>size</i>);</code></pre></blockquote><h4><a name = "tag_000_007_498"> </a>DESCRIPTION</h4><blockquote>The<i>malloc()</i>function allocates unused space for an object whose size in bytes is specifiedby<i>size</i>and whose value is indeterminate.<p>The order and contiguity of storage allocated by successive calls to<i>malloc()</i>is unspecified.The pointer returned if the allocation succeeds is suitablyaligned so that it may be assigned to a pointer to any type ofobject and then used to access such an object in the spaceallocated (until the space is explicitly freed or reallocated).Each such allocation will yield a pointer to an object disjointfrom any other object.The pointer returned points to the start (lowest byte address) ofthe allocated space.If the space cannot be allocated, a null pointer is returned.If the size of the space requested is 0, the behaviour isimplementation-dependent; the value returned will be either a nullpointer or a unique pointer.</blockquote><h4><a name = "tag_000_007_499"> </a>RETURN VALUE</h4><blockquote>Upon successful completion with<i>size</i>not equal to 0,<i>malloc()</i>returns a pointer to the allocated space. If<i>size</i>is 0, either a null pointer or a unique pointer that canbe successfully passed to<i><a href="free.html">free()</a></i>will be returned. Otherwise, it returns a null pointerand sets<i>errno</i>to indicate the error.</blockquote><h4><a name = "tag_000_007_500"> </a>ERRORS</h4><blockquote>The<i>malloc()</i>function will fail if:<dl compact><dt>[ENOMEM]<dd>Insufficient storage space is available.</dl></blockquote><h4><a name = "tag_000_007_501"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_502"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_503"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_007_504"> </a>SEE ALSO</h4><blockquote><i><a href="calloc.html">calloc()</a></i>,<i><a href="free.html">free()</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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