Date: Sat, 29 Jul 1995 06:40:16 -0700 From: Bruce Evans <bde> To: CVS-commiters, cvs-sys Subject: cvs commit: src/sys/sys tty.h Message-ID: <199507291340.GAA20080@freefall.cdrom.com>
next in thread | raw e-mail | index | archive | help
bde 95/07/29 06:40:15
Modified: sys/kern tty.c tty_conf.c
sys/net if_ppp.c if_sl.c
sys/sys tty.h
Log:
Obtained from: partly from ancient patches by ache and me via 1.1.5
Remove nullmodem().
It may be useful to have a null modem routine, but nullmodem()
wasn't one. nullmodem() was identical to ttymodem() except it
didn't implement MDMBUF (carrier) flow control, didn't do any
wakeups for off to on carrier transitions, and didn't flush the
i/o queues for on to off carrier transitions (flushing has the side
effect of waking up readers and writers) although it did generate
SIGHUPs. The wakeups must normally be done even if nullmodem() is
null in case something is sleeping waiting for a carrier transition.
In any case, the wakeups should be harmless. They may cause bogus
results for select(), but select() is already bogus for nonstandard
line disciplines.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199507291340.GAA20080>