December 2015
Beginner to intermediate
418 pages
10h 1m
English
Content preview from Mastering Embedded Linux ProgrammingBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Device nodes
Most devices in Linux are represented by device nodes, in accordance with the Unix philosophy that everything is a file (except network interfaces, which are sockets). A device node may refer to a block device or a character device. Block devices are mass storage devices such as SD cards or hard drives. A character device is pretty much anything else, once again with the exception of network interfaces. The conventional location for device nodes is the directory /dev. For example, a serial port may be represented by the device node /dev/ttyS0.
Device nodes are created using the program mknod (short for make node):
mknod <name> <type> <major> <minor>
name is the name of the device node that you want to create, type is either, c for character ...
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