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.
The posix_memalign() function shall allocate size bytes aligned on a
boundary specified by alignment, and shall return a pointer to the
allocated memory in memptr. The value of alignment shall be a power
of two multiple of sizeof(void *).
Upon successful completion, the value pointed to by memptr shall be a
multiple of alignment.
If the size of the space requested is 0, the behavior is
implementation-defined; the value returned in memptr shall be either
a null pointer or a unique pointer.
The free() function shall deallocate memory that has previously been
allocated by posix_memalign().
The posix_memalign() function shall fail if:
EINVAL The value of the alignment parameter is not a power of two
multiple of sizeof(void *).
ENOMEM There is insufficient memory available with the requested
The following sections are informative.
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 http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
IEEE/The Open Group 2013 POSIX_MEMALIGN(3P)