Channels ▼
RSS

Open Source

Loadable Modules & the Linux 2.6 Kernel

Source Code Accompanies This Article. Download It Now.


June, 2005: Loadable Modules & The Linux 2.6 Kernel

# make
make -C /usr/src/linux-2.6.5-1.358 SUBDIRS=/root/sysfs_example modules
make[1]: Entering directory '/usr/src/linux-2.6.5-1.358'
  CC [M]  /root/sysfs_example/sysfs_example.o
  Building modules, stage 2.
  MODPOST
  CC      /root/sysfs_example/sysfs_example.mod.o
  LD [M]  /root/sysfs_example/sysfs_example.ko
make[1]: Leaving directory '/usr/src/linux-2.6.5-1.358'
# insmod sysfs_example.ko 
# cd /sys
# ls
block  bus  class  devices  firmware  power  sysfs_example
# cd sysfs_sample
# ls
hex  integer  string
# cat hex
0xdeadbeef
# cat integer 
123
# cat string
test
# echo 0xbabeface > hex
# echo 456 > integer
# echo hello > string 
# cat hex
0xbabeface
# cat integer 
456
# cat string 
hello
# cd ..
# rmmod sysfs_example
# ls
block  bus  class  devices  firmware  power

Example 2: Interactive session in which the module sysfs_example.c is compiled, inserted, and tested. Attributes are inspected, changed, and inspected again.


Related Reading


More Insights






Currently we allow the following HTML tags in comments:

Single tags

These tags can be used alone and don't need an ending tag.

<br> Defines a single line break

<hr> Defines a horizontal line

Matching tags

These require an ending tag - e.g. <i>italic text</i>

<a> Defines an anchor

<b> Defines bold text

<big> Defines big text

<blockquote> Defines a long quotation

<caption> Defines a table caption

<cite> Defines a citation

<code> Defines computer code text

<em> Defines emphasized text

<fieldset> Defines a border around elements in a form

<h1> This is heading 1

<h2> This is heading 2

<h3> This is heading 3

<h4> This is heading 4

<h5> This is heading 5

<h6> This is heading 6

<i> Defines italic text

<p> Defines a paragraph

<pre> Defines preformatted text

<q> Defines a short quotation

<samp> Defines sample computer code text

<small> Defines small text

<span> Defines a section in a document

<s> Defines strikethrough text

<strike> Defines strikethrough text

<strong> Defines strong text

<sub> Defines subscripted text

<sup> Defines superscripted text

<u> Defines underlined text

Dr. Dobb's encourages readers to engage in spirited, healthy debate, including taking us to task. However, Dr. Dobb's moderates all comments posted to our site, and reserves the right to modify or remove any content that it determines to be derogatory, offensive, inflammatory, vulgar, irrelevant/off-topic, racist or obvious marketing or spam. Dr. Dobb's further reserves the right to disable the profile of any commenter participating in said activities.

 
Disqus Tips To upload an avatar photo, first complete your Disqus profile. | View the list of supported HTML tags you can use to style comments. | Please read our commenting policy.
 

Video