POSIX_MEMALIGN(P) POSIX Programmer's Manual POSIX_MEMALIGN(P)NAMEposix_memalign - aligned memory allocation (ADVANCED REALTIME)
SYNOPSIS
#include <stdlib.h>
int posix_memalign(void **memptr, size_t alignment, size_t size);
DESCRIPTION
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 com‐
pletion, the value pointed to by memptr shall be a multiple of align‐
ment.
The free() function shall deallocate memory that has previously been
allocated by posix_memalign().
RETURN VALUE
Upon successful completion, posix_memalign() shall return zero; other‐
wise, an error number shall be returned to indicate the error.
ERRORS
The posix_memalign() function shall fail if:
EINVAL The value of the alignment parameter is not a power of two mul‐
tiple of sizeof( void *).
ENOMEM There is insufficient memory available with the requested align‐
ment.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
The posix_memalign() function is part of the Advisory Information
option and need not be provided on all implementations.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSOfree() , malloc() , the Base Definitions volume of
IEEE Std 1003.1-2001, <stdlib.h>
COPYRIGHT
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 .
IEEE/The Open Group 2003 POSIX_MEMALIGN(P)
