Messages in this thread | | | Date | Tue, 12 Jun 2007 15:54:57 +0200 | From | "Federico Paparoni" <> | Subject | Linux kernel 2.4 programming problem |
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Hi all, i'm trying to create a simple system call in a kernel 2.4 distribution. I read guide/articles like this
http://irfanhabib.wordpress.com/2006/10/01/adding-a-system-call-linux-24x/
All the articles say the same things, but the implementation of my new system call doesn't work. I create a new entry in arch/i386/kernel/entry.S I create a new entry in include/asm/unistd.h I create a new function with the asmlinkage prefix in a source file already defined (in ipc/sem.c for example)
When i create my user program, it doesn't work. Firstly when i try to compile i receive a problem like this
: undefined reference to 'errno'
Then I include errno.h (also if i don't understand this step) and the compilation works, but the syscall neverworks, because the call always return -1.
Any help? Any tutorial FOR DUMMY MAN that someone already used?
Cheers
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