Section: POSIX Programmer's Manual (3P)
This manual page is part of the POSIX Programmer's Manual.
The Linux implementation of this interface may differ (consult
the corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
--- aligned memory allocation
int posix_memalign(void **memptr, size_t alignment, size_t size);
function shall allocate
bytes aligned on a boundary specified by
and shall return a pointer to the allocated memory in
The value of
shall be a power of two multiple of
Upon successful completion, the value pointed to by
shall be a multiple of
If the size of the space requested is 0, the behavior is
implementation-defined; the value returned in
shall be either a null pointer or a unique pointer.
function shall deallocate memory that has previously been allocated by
Upon successful completion,
shall return zero; otherwise, an error number shall be returned to
indicate the error.
function shall fail if:
The value of the alignment parameter is not a power of two multiple of
There is insufficient memory available with the requested alignment.
The following sections are informative.
function is part of the Advisory Information option and need not be
provided on all implementations.
The Base Definitions volume of POSIX.1-2008,
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of
Electrical and Electronics Engineers, Inc and The Open Group.
(This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) In the
event of any discrepancy between this version and the original IEEE and
The Open Group Standard, the original IEEE and The Open Group Standard
is the referee document. The original Standard can be obtained online at
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