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1.\" Copyright (c) 1991 The Regents of the University of California.
2.\" All rights reserved.
3.\"
4.\" This code is derived from software contributed to Berkeley by
5.\" the American National Standards Committee X3, on Information
6.\" Processing Systems.
7.\"
8.\" Redistribution and use in source and binary forms, with or without
9.\" modification, are permitted provided that the following conditions
10.\" are met:
11.\" 1. Redistributions of source code must retain the above copyright
12.\" notice, this list of conditions and the following disclaimer.
13.\" 2. Redistributions in binary form must reproduce the above copyright
14.\" notice, this list of conditions and the following disclaimer in the
15.\" documentation and/or other materials provided with the distribution.
16.\" 3. All advertising materials mentioning features or use of this software
17.\" must display the following acknowledgement:
18.\" This product includes software developed by the University of
19.\" California, Berkeley and its contributors.
20.\" 4. Neither the name of the University nor the names of its contributors
21.\" may be used to endorse or promote products derived from this software
22.\" without specific prior written permission.
23.\"
24.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34.\" SUCH DAMAGE.
35.\"
36.\" from: @(#)free.3 5.2 (Berkeley) 6/29/91
37.\" $Id: free.3,v 1.1.1.1 1995/10/18 08:42:17 deraadt Exp $
38.\"
39.Dd June 29, 1991
40.Dt FREE 3
41.Os
42.Sh NAME
43.Nm free
44.Nd free up memory allocated with malloc, calloc or realloc
45.Sh SYNOPSIS
46.Fd #include <stdlib.h>
47.Ft void
48.Fn free "void *ptr"
49.Sh DESCRIPTION
50The
51.Fn free
52function causes the space pointed to by
53.Fa ptr
54to be deallocated, that is, made available
55for further allocation.
56If
57.Fa ptr
58is a null pointer, no action occurs.
59Otherwise, if the argument does not match a pointer earlier
60returned by the
61.Xr calloc ,
62.Xr malloc ,
63or
64.Xr realloc
65function, or if the space has been deallocated by a call to
66.Fn free
67or
68.Xr realloc ,
69general havoc may occur.
70.Sh RETURN VALUES
71The
72.Fn free
73function returns no value.
74.Sh SEE ALSO
75.Xr calloc 3 ,
76.Xr malloc 3 ,
77.Xr realloc 3
78.Sh STANDARDS
79The
80.Fn free
81function conforms to
82.St -ansiC .