Device drivers in unix, Computer Engineering

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Device Drivers in UNIX, MS-DOS and Windows System

Though device drivers are in effect add-on modules they are however considered to be part of system because they are closely integrated with I/O Control System that deals with I/O related system calls. 

In UNIX device drivers are typically linked onto object code of kernel (core of operating system). This means that when a new device is to be used that was not included in original construction of operating system, UNIX kernel has to be re-linked with new device driver object code.  This scheme has advantages of run-time efficiency and simplicity however the shortcoming is the addition of a new device needs regeneration of the kernel. In UNIX every entry in /dev directory is associated with a device driver that manages communication with the related device. A list of few device names is as displayed below:

Device name         Description

/dev/console          system console

/dev/tty01              user terminal 1

/dev/tty02              user terminal 2

/dev/lp                   line printer

/dev/dsk/f03h        1.44 MB floppy drive


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