msgpullup_pad
mblk_t *hdrmp = msgpullup_pad(mp, hdr_len_reqd, pad_by);
mblk_t *tmp = msgpullup_pad(omp, ohdrslen, pad_by);
return (msgpullup_pad(mp, len, 0));
pullmp = msgpullup_pad(mp, 4, 0);
pullmp = msgpullup_pad(mp, 4, test_2_pad);
pullmp = msgpullup_pad(mp, msgsize(mp), test_3_pad);
pullmp = msgpullup_pad(mp, 42, test_4_pad);
extern mblk_t *msgpullup_pad(struct msgb *, ssize_t, size_t);