x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
MALLOC_USABLE_SIZE(3) Linux Programmer's Manual MALLOC_USABLE_SIZE(3)
NAME
malloc_usable_size - obtain size of block of memory allocated from heap
SYNOPSIS
#include <malloc.h>
size_t malloc_usable_size (void *ptr);
DESCRIPTION
The malloc_usable_size() function returns the number of usable bytes in
the block pointed to by ptr, a pointer to a block of memory allocated
by malloc(3) or a related function.
RETURN VALUE
malloc_usable_size() returns the number of usable bytes in the block of
allocated memory pointed to by ptr. If ptr is NULL, 0 is returned.
ATTRIBUTES
Multithreading (see pthreads(7))
The malloc_usable_size() function is thread-safe.
CONFORMING TO
This function is a GNU extension.
NOTES
The value returned by malloc_usable_size() may be greater than the
requested size of the allocation because of alignment and minimum size
constraints. Although the excess bytes can be overwritten by the
application without ill effects, this is not good programming practice:
the number of excess bytes in an allocation depends on the underlying
implementation.
The main use of this function is for debugging and introspection.
SEE ALSO
malloc(3)
COLOPHON
This page is part of release 3.69 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
http://www.kernel.org/doc/man-pages/.
GNU 2014-06-13 MALLOC_USABLE_SIZE(3)
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