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-'\" t
-.\" Copyright (c) 2012 by Michael Kerrisk <mtk.manpages@gmail.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH malloc_usable_size 3 (date) "Linux man-pages (unreleased)"
-.SH NAME
-malloc_usable_size \- obtain size of block of memory allocated from heap
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <malloc.h>
-.P
-.BI "size_t malloc_usable_size(void *_Nullable " ptr );
-.fi
-.SH DESCRIPTION
-This function can be used for
-diagnostics or statistics about allocations from
-.BR malloc (3)
-or a related function.
-.SH RETURN VALUE
-.BR malloc_usable_size ()
-returns a value no less than
-the size of the block of allocated memory pointed to by
-.IR ptr .
-If
-.I ptr
-is NULL, 0 is returned.
-.SH ATTRIBUTES
-For an explanation of the terms used in this section, see
-.BR attributes (7).
-.TS
-allbox;
-lbx lb lb
-l l l.
-Interface	Attribute	Value
-T{
-.na
-.nh
-.BR malloc_usable_size ()
-T}	Thread safety	MT-Safe
-.TE
-.SH STANDARDS
-GNU.
-.SH CAVEATS
-The value returned by
-.BR malloc_usable_size ()
-may be greater than the requested size of the allocation
-because of various internal implementation details,
-none of which the programmer should rely on.
-This function is intended to only be used
-for diagnostics and statistics;
-writing to the excess memory without first calling
-.BR realloc (3)
-to resize the allocation is not supported.
-The returned value is only valid at the time of the call.
-.SH SEE ALSO
-.BR malloc (3)