locking in a device driver

Dinesh Nair dinesh at alphaque.com
Tue Nov 1 21:57:51 PST 2005

On 11/02/05 06:16 Julian Elischer said the following:
> also, why do you need a pseudo device AND a device? The device driver 
> can do all the things you have
> suggested on its own.

this is so userland apps wont need to change when different devices are 
used. the pseudo device is the front for a number of real device drivers 
running different devices from a quad-span E1/T1 line card to 4-port 
FXS/FXO line cards. each of these cards are different, but present the same 
device interface to the userland app via the pseudo device driver.

Regards,                           /\_/\   "All dogs go to heaven."
dinesh at alphaque.com                (0 0)    http://www.alphaque.com/
| for a in past present future; do                                        |
|   for b in clients employers associates relatives neighbours pets; do   |
|   echo "The opinions here in no way reflect the opinions of my $a $b."  |
| done; done                                                              |

More information about the freebsd-hackers mailing list