PR_STEP
sp->pr_flags |= PR_STEP;
if (arg & PR_STEP)
(PR_STOPPED|PR_ISTOP|PR_DSTOP|PR_ASLEEP|PR_PCINVAL|PR_STEP \
{ PR_STEP, MSG_PR_FLAGS_STEP },
if (lsp->pr_flags & PR_STEP)
if (lsp->pr_flags & PR_STEP)
sp->pr_flags |= PR_STEP;
sp->pr_flags |= PR_STEP;
sp->pr_flags |= PR_STEP;
sp->pr_flags |= PR_STEP;