SW_SIGPIPE
(stp->sd_wput_opt & SW_SIGPIPE)) {
(stp->sd_wput_opt & SW_SIGPIPE) && sigpipeok) {
stp->sd_wput_opt = SW_SIGPIPE;
stp->sd_wput_opt &= ~(SW_SIGPIPE|SW_SNDZERO);
stp->sd_wput_opt |= SW_SIGPIPE;
if (stp->sd_wput_opt & SW_SIGPIPE)
stp->sd_wput_opt |= SW_SIGPIPE;
stp->sd_wput_opt &= ~SW_SIGPIPE;