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Length: 699 (0x2bb)
Types: TextFile
Notes: UNIX file
Names: »al.c«, »part.al.c«
└─⟦f27320a65⟧ Bits:30001972 Commodore 900 hard disk image with partial source code
└─⟦2d53db1df⟧ UNIX V7 Filesystem
└─ ⟦this⟧ »frankh/BUGS/al.c«
└─ ⟦this⟧ »frankh/BUGS/part.al.c«
/*
* External status interrupt handler for the SCC. The handler is called
* upon changes in the DCD or CTS modem control lines, or upon a break
* (line spacing) condition on the Rx line. Note that this only applies
* if the given line is opened (or attempting to be) with modem control
* enabled.
*/
alESintr(id)
{
.
.
.
.
what = inb(b+RR0);
outb(b+WR0, RESEXTINT);
--->>> if ((what & BREAK) != 0) {
inb(b+RR8); /* read + dismiss */
ttsignal(tp, SIGINT);
ttflush(tp);
} else { <<<---
if ((tp->t_flags & T_MODC) == 1)
if ((what & (DCD|CTS)) != 0)
if (tp->t_open == 0)
wakeup((char *)(&tp->t_open));
}
spl(s);
outb(b+WR0, RESIUS); /* reset interrupt */
}