On OS X, sys/socket.h has

#define    CMSG_LEN(l)             (ALIGN(sizeof(struct cmsghdr)) + (l))

and

#define    CMSG_SPACE(l)           (ALIGN(sizeof(struct cmsghdr)) +
ALIGN(l))

where i386/param.h has

#define ALIGNBYTES      3
#define ALIGN(p)        (((unsigned int)(p) + ALIGNBYTES) &~ ALIGNBYTES)

Should the Solaris 8 versions of CMSG_* also use some kind of ALIGN
macro?