do_posix_spawn
error = do_posix_spawn(l, &pid, &child_ok, SCARG_P32(uap, path), fa,
error = do_posix_spawn(l1, &pid, &child_ok, SCARG(uap, path), fa, sa,
int do_posix_spawn(struct lwp *, pid_t *, bool *, const char *,