Hi. On Sat, Jan 28, 2017 at 04:26:16PM +1100, Damian McGuckin wrote: > What is the recommended most portable way to force memory alignment for a > datum of any type, assuming one has a pointer say > > char *x > > I currently use something like > > char *xany = aligntonext(x, sizeof(long)) > > where I use my own function 'aligntionext' which is defined below and I also > assume that a 'long' will be the natural word-size of the machine and that > any datum things just needs to align to this boundary. That said, if the > second argument is say 4k, the function will align its result to a 4k > boundary. > > I was wondering if there is an optimal, better, more acceptable, or more > portable, way.
Maybe posix_memalign(3) is API you are looking for.
