Block device and character device
Describe block device and character device?
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Character devices deal along with IO on a character through character basis. The clearest example is a keyboard, where every key produce a character on the device. The mouse is another instance of character devices. Every motion or click sends a character to the /dev/input/mouse0 device. To check it out do $cat /dev/input/mouse0 , then move mouse (see what happens)
Block devices read data in big chunks or blocks. Data storage devices, like IDE hard drives (/dev/hd), SCSI hard drives (/dev/sd), and CD-ROMs (/dev/cdrom or /dev/sr0) are block devices. IO interactions along with block devices transact to chunks of data (blocks), which let large quantities of data to be moved back and forth more efficiently(unlike character device). eg: $df -h
Broadly, block devices can be mounted and cached, and char devices are for communication devices, aren’t cached nor block aligned, and can’t be mounted. Particularly, /dev/scd* (block) are for cdroms, provide the block access and commands for ejecting, closing, playing, etc. The equivalent character device for the cdrom is /dev/sg1
UNIX OS shell: A shell is an interactive user interface to operating system services which permits a user to enter commands as character strings or via a graphical user interface. The shell transforms them to system calls the OS or forks off a process
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Structural Heuristics: Structural coverage measures can be used during directed model checking to improve the state space coverage (Groce and Visser 2002). Rather than looking for a particular error, it may be best to try and explore the structure of
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