[TUHS] UNIX System V Release 2.2 gdts Vax-780

[KenUnix]

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 at horsfall.org> wrote:

> On Wed, 15 Mar 2023, arnold at skeeve.com wrote:
>
> [...]
>
> > 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
>


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