hosking@convex.UUCP (06/16/84)
#N:convex:33500006:000:510
convex!hosking Jun 15 00:25:00 1984
In 4.2BSD tty.c, routine "ttwrite", there appears to be a bug with the way
interrupt masking is done. Assuming you reach "ovhiwat:", interrupts are
masked with s = spl5();. However, there are at least 2 ways to leave this
code without a corresponding splx(s). Oops!
ovhiwat:
s = spl5();
.
.
.
if (tp->t_state&TS_NBIO) {
if (uio->uio_resid == cnt)
return (EWOULDBLOCK); <----------
return (0); <----------
}
Doug Hosking
Convex Computer Corp.
..{allegra, ihnp4}!convex!hosking