POSIX_MEMALIGN(P) POSIX Programmer's Manual POSIX_MEMALIGN(P)
posix_memalign - aligned memory allocation (ADVANCED REALTIME)
int posix_memalign(void **memptr, size_t alignment, size_t size);
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 suc-
cessful 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
Upon successful completion, posix_memalign() shall return zero; otherwise, an error number
shall be returned to indicate the error.
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 alignment.
The following sections are informative.
The posix_memalign() function is part of the Advisory Information option and need not be
provided on all implementations.
free() , malloc() , the Base Definitions volume of IEEE Std 1003.1-2001, <stdlib.h>
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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 POSIX_MEMALIGN(P)