scooter@ucsfcgl.UUCP (Scooter Morris%John Gardi) (12/19/84)
Subject: select system call does not work for ttys when DH_SOFTCAR is defined Index: sys/dev/tty.c 2.9bsd Description: When a system has a DH driver and DH_SOFTCAR is defined, the select system call fails for ttys which have the softcar bit set. Repeat-By: Try a select on a tty with a softcar bit set. The results will be sporadic at best, but will never work correctly. Fix: The problem is in the ttselect() routine when it assigns the pointer to the tty structure. It uses the minor(dev) macro which strips the lower 8 bits off of the device number. If the tty has the soft carrier bit (128) set, however, the pointer returned is off in never-never-land. I just included dh.h in tty.c and if DH_SOFTCAR is set replaced minor(dev) with minor(dev)&0177.