109 lines
3.5 KiB
HTML
109 lines
3.5 KiB
HTML
<!--
|
|
Copyright (c) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2009, 2013
|
|
The President and Fellows of Harvard College.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
1. Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
2. Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in the
|
|
documentation and/or other materials provided with the distribution.
|
|
3. Neither the name of the University nor the names of its contributors
|
|
may be used to endorse or promote products derived from this software
|
|
without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE UNIVERSITY AND CONTRIBUTORS ``AS IS'' AND
|
|
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE UNIVERSITY OR CONTRIBUTORS BE LIABLE
|
|
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
SUCH DAMAGE.
|
|
-->
|
|
<html>
|
|
<head>
|
|
<title>malloc</title>
|
|
<link rel="stylesheet" type="text/css" media="all" href="../man.css">
|
|
</head>
|
|
<body bgcolor=#ffffff>
|
|
<h2 align=center>malloc</h2>
|
|
<h4 align=center>OS/161 Reference Manual</h4>
|
|
|
|
<h3>Name</h3>
|
|
<p>
|
|
malloc - allocate memory
|
|
</p>
|
|
|
|
<h3>Library</h3>
|
|
<p>
|
|
Standard C Library (libc, -lc)
|
|
</p>
|
|
|
|
<h3>Synopsis</h3>
|
|
<p>
|
|
<tt>#include <stdlib.h></tt><br>
|
|
<br>
|
|
<tt>void *</tt><br>
|
|
<tt>malloc(size_t </tt><em>size</em><tt>);</tt>
|
|
</p>
|
|
|
|
<h3>Description</h3>
|
|
<p>
|
|
<tt>malloc</tt> allocates <em>size</em> bytes of memory and returns a
|
|
pointer to it. The memory is not necessarily zero-filled. (To get
|
|
zero-filled memory, call <A HREF=bzero.html>bzero</A> or
|
|
<A HREF=memset.html>memset</A>, or use
|
|
<A HREF=calloc.html>calloc</A>.)
|
|
</p>
|
|
|
|
<p>
|
|
The pointer returned must be suitably aligned for use with any data
|
|
type.
|
|
</p>
|
|
|
|
<p>
|
|
When asked to allocate zero bytes, <tt>malloc</tt> may either always
|
|
return <tt>NULL</tt>, or may return distinct non-null pointers that do
|
|
not point to any storage.
|
|
</p>
|
|
|
|
<p>
|
|
While <tt>malloc</tt> may at its option allocate more than
|
|
<em>size</em> bytes to fill a request, code that calls <tt>malloc</tt>
|
|
may not depend on such behavior and must not perform any accesses
|
|
outside of the bounds defined by <em>size</em>.
|
|
</p>
|
|
|
|
<p>
|
|
It is legitimate for memory returned by malloc to not actually be
|
|
physically mapped until it is used.
|
|
If at the time it is used, no physical memory is available and there
|
|
is no space to swap something out to make room, the process may
|
|
potentially receive a fatal signal or be killed.
|
|
This behavior is often somewhat contentious; a full discussion of the
|
|
possible alternatives and their pros and cons is well beyond the scope
|
|
of this man page.
|
|
</p>
|
|
|
|
<h3>Return Values</h3>
|
|
<p>
|
|
<tt>malloc</tt> returns a pointer to the memory allocated. If memory
|
|
cannot be obtained, NULL is returned.
|
|
</p>
|
|
|
|
<h3>See Also</h3>
|
|
<p>
|
|
<A HREF=calloc.html>calloc</A>,
|
|
<A HREF=realloc.html>realloc</A>,
|
|
<A HREF=free.html>free</A>
|
|
</p>
|
|
|
|
</body>
|
|
</html>
|