posix_memalign - aligned memory allocation (ADVANCED REALTIME)
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.
[CX] The free() function shall deallocate memory that has previously been allocated by posix_memalign().
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:
- The value of the alignment parameter is not a power of two multiple of sizeof( void *).
- There is insufficient memory available with the requested alignment.
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>
First released in Issue 6. Derived from IEEE Std 1003.1d-1999.
In the SYNOPSIS, the inclusion of <sys/types.h> is no longer required.