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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>calloc</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_001_341"> </a>NAME</h4><blockquote>calloc - a memory allocator</blockquote><h4><a name = "tag_000_001_342"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="stdlib.h.html">stdlib.h</a>>void *calloc(size_t <i>nelem</i>, size_t <i>elsize</i>);</code></pre></blockquote><h4><a name = "tag_000_001_343"> </a>DESCRIPTION</h4><blockquote>The<i>calloc()</i>function allocates unused space for an array of<i>nelem</i>elements each of whose size in bytes is<i>elsize</i>.The space is initialised to all bits 0.<p>The order and contiguity of storage allocated by successive callsto<i>calloc()</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 or an array of suchobjects 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_001_344"> </a>RETURN VALUE</h4><blockquote>Upon successful completion with both<i>nelem</i>and<i>elsize</i>non-zero,<i>calloc()</i>returns a pointer to the allocated space.If either<i>nelem</i>or<i>elsize</i>is 0, then either a null pointer or a unique pointervalue that can be successfully passed to<i><a href="free.html">free()</a></i>is returned.Otherwise, it returns a null pointerand sets<i>errno</i>to indicate the error.</blockquote><h4><a name = "tag_000_001_345"> </a>ERRORS</h4><blockquote>The<i>calloc()</i>function will fail if:<br><dl compact><dt>[ENOMEM]<dd>Insufficient memory is available.</dl></blockquote><h4><a name = "tag_000_001_346"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_347"> </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_001_348"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_001_349"> </a>SEE ALSO</h4><blockquote><i><a href="free.html">free()</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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