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5.2.6. /proc/devices
This file displays the various character and block devices currently configured (not including devices whose modules are not loaded). Below is a sample output from this file:
The output from
/proc/devices includes the major number and name of the device, and is broken into two major sections: Character devices and Block devices.
Character devices are similar to block devices, except for two basic differences:
- Character devices do not require buffering. Block devices have a buffer available, allowing them to order requests before addressing them. This is important for devices designed to store information — such as hard drives — because the ability to order the information before writing it to the device allows it to be placed in a more efficient order.
- Character devices send data with no preconfigured size. Block devices can send and receive information in blocks of a size configured per device.
For more information about devices refer to the following installed documentation:
/usr/share/doc/kernel-doc-<version>/Documentation/devices.txt
/usr/share/doc/kernel-doc-<version>/Documentation/devices.txt/usr/share/doc/kernel-doc-<version>/Documentation/devices.txt/usr/share/doc/kernel-doc-<version>/Documentation/devices.txt
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