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Loadable Modules & the Linux 2.6 Kernel

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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.
  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
# cat integer 
# cat string
# echo 0xbabeface > hex
# echo 456 > integer
# echo hello > string 
# cat hex
# cat integer 
# cat string 
# 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.

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