SR_POLLIN
if (!(stp->sd_rput_opt & SR_POLLIN))
stp->sd_rput_opt &= ~SR_POLLIN;
if (!(stp->sd_rput_opt & SR_POLLIN))
stp->sd_rput_opt &= ~SR_POLLIN;
if (!(stp->sd_rput_opt & SR_POLLIN))
stp->sd_rput_opt &= ~SR_POLLIN;
stp->sd_rput_opt |= SR_POLLIN;
if (!(stp->sd_rput_opt & SR_POLLIN))
stp->sd_rput_opt &= ~SR_POLLIN;