Questions tagged [character-device]
The character-device tag has no usage guidance.
11
questions
1
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1answer
53 views
Kernel throws error while writing to the character device file in 4.9.82-ti-r102 debian 9.3
I created the device file under /dev folder successfully, but writing to that device file makes kernel to throw following error messages.
Message from syslogd@beaglebone at Feb 26 15:40:10 ... kernel:...
1
vote
0answers
304 views
Nvme not showing up in /dev on Ubuntu 19.04 (5.0.0-13)
I have an Ubuntu 19.04 on a machine with an nvme drive. However, the drive is not found in /dev/nvme*. cat /proc/devices shows that nvme is loaded as a character device and not a block device and ...
-1
votes
1answer
65 views
make a pseudo device like /dev/random that outputs primes?
/dev/primes is what I want without writing C code just python which I have known and easily written the program.
The device file should be similar to /dev/urandom that outputs primes instead of ...
0
votes
1answer
55 views
Send Shift PgUp to the console
With a little help from an answer found here I was able to use below script to send keystrokes to the VGA console /dev/tty1
#!/usr/bin/perl
use warnings;
use strict;
open( my $TTY1 , '>' , '/dev/...
0
votes
0answers
108 views
How to create a new character device under /proc/device file?
I am trying to create a node with mknod /tmp/ttyACM0 c 166 0 command but then No such device or address error returns when I try to open serial port with ttyACM0 because there is no device in proc/...
-2
votes
1answer
110 views
Does the virtual filesystem work on top of character devices and network subsystems?
Does the virtual filesystem work on top of character devices and network subsystems, or just on top of filesystems and block devices?
Could you also explain a bit about in what sense "the VFS is ...
3
votes
1answer
730 views
Is a device being a block or character device determined purely by hardware?
From https://unix.stackexchange.com/a/472920/674
A "character device" and "block device" are abstractions, usually used in Unix-style systems in classifying various devices.
Is a device being a ...
-2
votes
1answer
116 views
Why is the transfer unit of block devices block not page?
Operating System Concepts says
A character-stream device transfers bytes one by one, whereas a block device transfers a block of bytes as a unit.
But I heard that the unit of transfer between main ...
0
votes
2answers
403 views
Do “serial ports” or “parallel ports” apply to character devices only, but not to block devices?
From
http://haifux.org/lectures/86-sil/kernel-modules-drivers/node10.html
A Character ('c') Device is one with which the Driver communicates by
sending and receiving single characters (bytes, ...
-4
votes
1answer
99 views
Are there implications between block/character device and random/sequential access? [closed]
Operating System Concepts says:
Devices vary on many dimensions, as illustrated in Figure 13.7.
• Character-stream or block. A character-stream device transfers bytes
one by one, whereas a ...
-1
votes
1answer
600 views
Can filesystems be created only on block devices, but not on character devices?
Can filesystems be created only on block devices, but not on character devices?
Can a filesystem be viewed as a block device itself (for example, when programming to use a file system)?
My guess is ...
