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Editorial Team
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Asked: 2026-05-30T17:40:31+00:00

I am going to write a Lexical that is going to be part of

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I am going to write a Lexical that is going to be part of a kernel module in which I will parse a file and return tokens. For that, I may need to use functions like fopen, getc,putc,fseek etc which obviously are user space functions. I have searched for alternatives to these functions in kernel space and I found functions like open, filp_open, sys_open etc which I guess would be OK for me. But what I want to know is whether functions like getc, putc, seek etc (which can be very handy in file operations), are available in kernel space?

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1 Answer

  1. Editorial Team

    Don’t.

    Reading files, and especially complex configuration files, is not something which should be done from the kernel.

    There’s a lot of information about why this is a bad idea. The KernelNewbies FAQ is a good start.

    Really, really don’t do this. I integrate a lot of vendor (kernel) code, and this is one of the mistakes which keeps coming up and biting us. Learn to do things the right way from the start.

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