15 Mar
2023
15 Mar
'23
12:09 p.m.
In: /usr/src/uts/vax/cf
This is what is in conf.c:
struct cdevsw cdevsw[] = {
/* 0*/ conopen, conclose, conread, conwrite,
conioctl, 0,
/* 1*/ dzopen, dzclose, dzread, dzwrite, dzioctl,
dz_tty,
/* 2*/ syopen, nulldev, syread, sywrite, syioctl, 0,
/* 3*/ nulldev, nulldev, mmread, mmwrite, nodev, 0,
/* 4*/ gdopen, gdclose, gdread, gdwrite, nodev, 0,
/* 5*/ htopen, htclose, htread, htwrite, nodev, 0,
/* 6*/ nodev, nodev, nodev, nodev, nodev, 0,
/* 7*/ nodev, nodev, nodev, nodev, nodev, 0,
/* 8*/ erropen, errclose, errread, nodev, nodev, 0,
};
In "master" sample entries are:
ts11 4 36 115 ts 4 1 5 1 5
tu78 1 36 515 hu 0 1 5 4 5
rm05 1 76 515 hm 0 0 4 8 5
nsc 4 77 5 nsc 8 0 10 1 5
ndb ct
*lp11 4 73 5 lp 4 0 6 1 4*
dn11 4 32 6 dn 8 0 7 4 5
vp 4 33 5 vp 16 0 14 1 5
vp
dmc11 8 37 6 dmc 8 0 19 1 5
Those numbers do not mean much to me.
Does this help in determining major/minor number for lp?
Thanks
Ken
On Wed, Mar 15, 2023 at 4:53 AM Dave Horsfall <dave(a)horsfall.org> wrote:
On Wed, 15 Mar 2023, arnold(a)skeeve.com wrote:
[...]
--
End of line
JOB TERMINATED
That is, 'c' for character device,
major device is the index in cdevsw,
and minor device indicates which physical one to use. Since you only
have one, it should be 0.
There's also the possibility of using the upper-order bits to pass flags,
although there's not a lot that you can do with a printer (control of page
throw, etc).
-- Dave