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Date: Tue, 12 Jun 2007 08:12:35 -0700 From: Randy Dunlap <randy.dunlap@...cle.com> To: "Federico Paparoni" <federico.paparoni@...il.com> Cc: linux-kernel@...r.kernel.org Subject: Re: Linux kernel 2.4 programming problem On Tue, 12 Jun 2007 15:54:57 +0200 Federico Paparoni wrote: > 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? You can try this one. It used to work, but I haven't updated or tested it lately. http://www.xenotime.net/linux/syscall_ex/ --- ~Randy *** Remember to use Documentation/SubmitChecklist when testing your code *** - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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