NAME

       posix_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 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().

RETURN VALUE

       Upon successful completion, posix_memalign() shall return zero; otherwise, 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 multiple of sizeof( void
              *).

       ENOMEM There is insufficient memory available with the requested alignment.

       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 ALSO

       free() , 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 .