Is it possible to call a user-space callback function from kernel space in Linux (ioctl)?

Posted by Makis on Stack Overflow See other posts from Stack Overflow or by Makis
Published on 2010-04-22T10:29:58Z Indexed on 2010/04/22 10:33 UTC
Read the original article Hit count: 384

Filed under:

linux-kernel

|

linux-device-driver

|

ioctl

|

kernel-programming

Is it possible to expand the ioctl interface in Linux so that the user-space application can send a pointer to a function to the kernel space driver?

I'm in particular thinking of ways to handle the stream in user-controllable way but doing it in the kernel. Those operations could be attached to the kernel module but this would make development a lot easier as I wouldn't need to mess with the kernel during development.

More specifically, this would be the process:

Data is read by the driver to a buffer.
Data is handled by these user-defined functions in place.
Some more handling is done, possibly with some HW blocks.
Data is used by a user-space application.

© Stack Overflow or respective owner

Related posts about linux-kernel

Out of disk space - /boot at 100%

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
My /boot is at 100%. When I run aptitude search ~ilinux-image I'm getting loads of unused images. When I try to delete one of them (after checking which one is currently in use by doing uname -r), e.g apt-get autoremove linux-image-3.2.0-44-generic I get: Reading package lists... Done Building dependency… >>> More
Linux Kernel Threads - scheduler

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi People, Is Linux Kernel scheduler a part of init process? My understanding is that it is part of Kernel threads managed internally not visible to user by either top or ps. Please correct my understanding. Is it possible to view standard kernel threads through any kernel debugger to see how standard… >>> More
Linux kernel scheduling

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I wish to know how Old Linux scheduling algorithm SJF (shortest job first) calculates the process runtime ? >>> More
The newbie's guide to hacking the Linux kernel

as seen on Internet.com - Search for 'Internet.com'
<b>TuxRadar: </b>"We asked prolific kernel hacker (and Linux Format reader!) Greg Kroah-Hartman to tell us what it takes for newbies to patch the Linux kernel - here's what he had to say." >>> More
Google open source guru says Android code will be in Linux kernel in time

as seen on Internet.com - Search for 'Internet.com'
<b>ZDNet:</b> "Google’s Android code will assume its rightful place in the Linux kernel — in good time, the company’s top open source guru says." >>> More

Related posts about linux-device-driver

Linux Device Driver: Symbol "memcpy" not found

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, I'm trying to write a Linux device driver. I've got it to work really well, until I tried to use "memcpy". I don't even get a compiler error, when I "make" it just warns me: WARNING: "memcpy" [/root/homedir/sv/main.ko] undefined! OK and when I try to load via insmod, I get on the console: insmod:… >>> More
Linux Device Driver - what's wrong with my device_read()?

as seen on Stack Overflow - Search for 'Stack Overflow'
My device /dev/my_inc is meant to take a positive integer N represented as an ascii string, and store it. Any read from /dev/my_inc will produce the ascii string representation of N + 1. The problem is that when I cat /dev/my_inc, I only get the first byte of myinc_value output to my shell, even… >>> More
How to make an existing socket fail?

as seen on Stack Overflow - Search for 'Stack Overflow'
OK. So, this is exactly the opposite of what everyone asks about in network programming. Usually, people ask how to make a broken socket work. I, on the other hand am looking for the opposite. I currently have sockets working fine, and want them to break to re-create this problem we are seeing… >>> More
OSS4 on Debian Squeeze

as seen on Super User - Search for 'Super User'
Hi, I am trying to get OSS4 to work on a Debian Squeeze 64 bit machine with an usb sound adapter. There is no sound from this adapter at the present, although it worked just before on the previous installation. You can see the output of some commands here: $ sudo /etc/init.d/oss4-base restart Stopping… >>> More
Atheros LAN card driver, Linux compiling problem

as seen on Super User - Search for 'Super User'
I have installed openSUSE 11.4 to my new workstation. It says that there is Attansic ETHERNET controller on board. But no devices seen. I typed: lspci and it returned: atheros communications device 1083. I have downloaded drivers. I'm trying to compile the driver. But I get the error: **Makefile:94:… >>> More