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
multiple of sizeof( void *), that is also a power of two. Upon
successful completion, the value pointed to by memptr shall be a
multiple of alignment.
The free() function shall deallocate memory that has previously been
allocated by posix_memalign().
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. 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.opengroup.org/unix/online.html