7eb2bbeebf
Temporarily nuke TS_WOPEN. It was only used for the obscure MDMBUF flow control option in the kernel and for informational purposes in `pstat -t'. The latter worked properly only for ptys. In general there may be multiple processes sleeping in open() and multiple processes that successfully opened the tty by opening it in O_NONBLOCK mode or during a window when CLOCAL was set. tty.c doesn't have enough information to maintain the flag but always cleared it in ttyopen(). TS_WOPEN should be restored someday just so that `pstat -t' can display it (MDMBUF is already fixed). Fixing it requires counting of processes sleeping in open() in too many serial drivers. |
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