Stack Overflow
Stack Overflow

Questions tagged [mknod]

33 questions
51
votes
3 answers

How can I create a device node from the init_module code of a Linux kernel module?

I am writing a module for the Linux kernel, and I want to create some device nodes in the init() function: int init_module(void) { Major = register_chrdev(0, DEVICE_NAME, &fops); // Now I want to create device nodes // with the returned…
Alptugay
  • 1,676
  • 4
  • 22
  • 29
51
votes
2 answers

What is the opposite of `mknod`?

I am learning to write character device drivers from the Kernel Module Programming Guide, and used mknod to create a node in /dev to talk to my driver. However, I cannot find any obvious way to remove it, after checking the manpage and observing…
merlin2011
  • 71,677
  • 44
  • 195
  • 329
15
votes
1 answer

Python module 'os' has no attribute 'mknod'

I want to create a new file in Python for that I am using mknod command, but getting error as: os.mknod(); AttributeError: module 'os' has no attribute 'mknod' I am using windows and attributes other than 'mknod' are working.
Manthan Sharma
  • 329
  • 1
  • 3
  • 12
7
votes
2 answers

How to create tun interface inside Docker container image?

I'm trying to create a Docker image with a /dev/net/tun device so that the image can be used across Linux, Mac and Windows host machines. The device does not need access to the host's network interface. Note that passing --device…
moof2k
  • 1,678
  • 1
  • 17
  • 19
4
votes
1 answer

New device node created on host does not get reflected in Docker container when using --device flag

I'm running a container with the following options: docker run -d --device=/dev/bus/usb:/dev/bus/usb --device=/dev/ttyS0:/dev/ttyS0 instr_img Inside the container I have a Python code which resets a USB device that in turn causes a device file in…
rung
  • 49
  • 4
4
votes
2 answers

C: creating named pipe using mknod() not working

Language: C OS: Ubuntu I'm simply trying to create a FIFO named pipe using the command: state = mknod("pipe.txt", S_IFIFO | 0666, 0); the problem is i always get the state's value to be -1 (meaning it has failed) instead of 0. perror returns…
Popokoko
  • 6,413
  • 16
  • 47
  • 58
3
votes
3 answers

Using mknod on Ubuntu in c program

I am trying to make a c program where i am using mknod command like #include #include #include char info[50]; main() { int fdr; int rc = mknod("testfile",'b',0); if(rc<0) { perror("Error in mnod"); …
asb
  • 910
  • 3
  • 10
  • 19
3
votes
3 answers

how to write a bash script that would get minor and major device numbers of /dev/random

I am trying to run a program in a chrooted environment, and it needs /dev/random as a resource. Manually I can do ls -l on it and then create the file again with mknod c xx yy, but I need to make it automatic and I don't think these version numbers…
user3779430
  • 420
  • 5
  • 16
3
votes
1 answer

Why are directory files not read using fread?

I was going through an example from Maurice Bach's Unix Book. He writes a simple copy program like mentioned below. However it fails when the inputfile is a directory file. I did stumble upon opendir and few other such API's - should I use that? If…
Nishant
  • 20,354
  • 18
  • 69
  • 101
3
votes
1 answer

mknod error while trying to make a device driver file with shell

My code #!/bin/sh major=$(awk '$2=="module_dev" {print $1}' /proc/devices) echo $major mknod /dev/module_dev c $major 0 I'm practicing character device drivers, and this is one of the examples. The code above is ought to create a device driver…
user3062950
  • 61
  • 1
  • 6
2
votes
2 answers

Redirecting stdin through a FIFO

I'm running a server app (written in Java) under GNU/Linux which takes input (from stdin, I guess) and interprets it to run some commands. I dont want to run the app inside a terminal window (I'd like to run a daemon), but I'd still like to be able…
kaoD
  • 1,534
  • 14
  • 25
2
votes
1 answer

C program that controls mplayer

I have to do program in C on linux, that can control mplayer using mknod() function. When I run mplayer by this command mplayer -input file=/tmp/film spiderman.ts I want to control that with my C program just like with the echo function echo…
Piodo
  • 616
  • 4
  • 20
2
votes
1 answer

openconnect in dockers/IBM bluemix (Error: TUNSETIFF failed: Inappropriate ioctl for device)

I've created my own container image based on Ubuntu 14.04 and installed openconnect using apt-get. I can ping google, and access the app I have running on the port I expect. Now I am trying to get a VPN connection from the container to a on-prem…
Thomas Hubregtsen
  • 449
  • 1
  • 5
  • 22
2
votes
2 answers

Implicit declaration of function ‘mknod’ but I have the headers included

I am trying to make a C program that uses named pipes to communicate with a C++ program on a Raspberry Pi 3. The warning that GCC is spitting out when I compile some code of mine: /home/pi/BluetoothTest/btooth.c|76|warning: implicit declaration of…
cyborgdragon
  • 109
  • 6
2
votes
1 answer

mknod() not creating named pipe

I'm trying to create a FIFO named pipe using the mknod() command: int main() { char* file="pipe.txt"; int state; state = mknod(file, S_IFIFO & 0777, 0); printf("%d",state); return 0; } But the file is not created in my current directory. I tried…
aashima
  • 1,203
  • 12
  • 31
1
2 3