Difference between revisions of "Device"
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* '''sockets''' -- File-like interfaces to network resources. Someone add more. :) | * '''sockets''' -- File-like interfaces to network resources. Someone add more. :) | ||
* '''pipes''' -- A "named pipe." See [[FIFO]] | * '''pipes''' -- A "named pipe." See [[FIFO]] | ||
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| + | # ls -la /dev/ | ||
| + | [snip] | ||
| + | brw-rw---- 1 root disk 1, 9 2005-12-27 14:14 ram9 | ||
| + | crw-rw-rw- 1 root root 1, 8 2005-12-27 14:14 random | ||
| + | [snip] | ||
| + | |||
| + | You can see the b and c for block vs character. You can use [[mknod]] to create a block or charcter device. | ||
Revision as of 18:49, 20 January 2006
Devices are found in the /dev directory. There are several types of devices:
- block devices -- A.K.A "cooked" devices. Data stored on the device is typically accessed in groups, instead of one byte at a time. Hard drives, tape systems, and other mass-storage devices are almost always block devices. Data is more or less random-access (although performance may suffer greatly, as in the case of a tape).
- character devices -- Data is usually managed in a stream. Serial, audio, and most other non-storage devices fall into this category.
- sockets -- File-like interfaces to network resources. Someone add more. :)
- pipes -- A "named pipe." See FIFO
# ls -la /dev/ [snip] brw-rw---- 1 root disk 1, 9 2005-12-27 14:14 ram9 crw-rw-rw- 1 root root 1, 8 2005-12-27 14:14 random [snip]
You can see the b and c for block vs character. You can use mknod to create a block or charcter device.
