Currently viewing the tag: "kernel"

How to find ioctl callback function inside the driver source

By On 7 April 2016 · Leave a Comment

How can you see which code a module executes when your app calls an ioctl system call?

Consider this situation:

You app gets to the point where it executes an ioctl syscall and returns an error, e.g.

if (ioctl(fd, STVMIX_IOC_DISCONNECTLAYERS, &STVMIX_Ioctl_DisconnectLayers) != 0) { /* IOCTL failed */ ErrorCode = ST_ERROR_BAD_PARAMETER; printf (” STVMIX_DisconnectLayers():Ioctl error […]

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How to uninstall the old kernels in Ubuntu (and grub)

By On 1 May 2012 · 1 Comment

How can we remove the unused linux kernels and at the same time have our boot configuration (grub’s entries in the grub cfg menu) updated?

First we want to list all the kernel-related packages, like linux-image and linux-headers, linux-generic, etc:

$ dpkg -l linux-*

On my 10.04 Ubuntu system the above command results in […]

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How to disable Linux FC graphical boot (start in text mode)

By On 27 September 2011 · 1 Comment

For those of you wondering how to make Fedora Linux boot into text mode – here’s how to disable the graphics boot/login screen:

If you are running an older distribution you need to edit the file /etc/inittab (must be root) and change

id:5:initdefault:
    to
id:3:initdefault:

If you […]

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