SYS_pause
(void) Psysentry(P, SYS_pause, 1);
(void) Psysexit(P, SYS_pause, 1);
P->status.pr_lwp.pr_syscall == SYS_pause &&
(void) Psysentry(P, SYS_pause, 0);
(void) Psysexit(P, SYS_pause, 0);