CODEWITHSUNDEEP
linuxkernelkernel-moduleproc
PinkElephantsOnParade
PinkElephantsOnParade

Reputation: 6592

How do I call my kernel module which writes to a proc file?

I copied and pasted the code from this url: http://linux.die.net/lkmpg/x769.html

I replaced the outdated &proc_root foolery and commented out the "Our_Proc_File->owner = THIS_MODULE;" line on account that it gave me trouble while building.

I then made an appropriate makefile, compiled the .ko and did the deed with insmod.

Two questions:

  1. How do I read from the procfile?

  2. Also, I see an entry for the file is made at module load, but when is this file written?

BONUS These questions may root from a misunderstanding of proc. It is my impression that proc "files" are written to upon file read to deliver up-to-date info.

  1. Is that wrong?

Upvotes: 0

Views: 107

Answers (1)

Ignacio Vazquez-Abrams
Ignacio Vazquez-Abrams

Reputation: 798476

  1. With read(2). cat can do this for you from the shell.
  2. Never. The contents are created dynamically when the file is read. This is why we specify a read callback for the file.

Upvotes: 2

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