Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161077AbXALKnv (ORCPT ); Fri, 12 Jan 2007 05:43:51 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161079AbXALKnv (ORCPT ); Fri, 12 Jan 2007 05:43:51 -0500 Received: from tmailer.gwdg.de ([134.76.10.23]:40209 "EHLO tmailer.gwdg.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161077AbXALKnu (ORCPT ); Fri, 12 Jan 2007 05:43:50 -0500 Date: Fri, 12 Jan 2007 11:43:02 +0100 (MET) From: Jan Engelhardt To: Jesper Juhl cc: congwen , linux-kernel Subject: Re: How can I create or read/write a file in linux device driver? In-Reply-To: <9a8748490701120227h757d473ctaf5673aa318fe090@mail.gmail.com> Message-ID: References: <200701121547221465420@gmail.com> <9a8748490701120227h757d473ctaf5673aa318fe090@mail.gmail.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-Spam-Report: Content analysis: 0.0 points, 6.0 required _SUMMARY_ Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 890 Lines: 25 On Jan 12 2007 11:27, Jesper Juhl wrote: > On 12/01/07, congwen wrote: >> Hello everyone, I want to create and read/write a file in Linux kernel or >> device driver, > > Don't read/write user space files from kernel space. > > Please search the archives, this get asked a lot and it has been > explained a million times why it's a bad idea. > You can also read http://www.linuxjournal.com/article/8110 The article does it the bad way. IMHO filp_open() and vfs_read/vfs_write() are much less problematic wrt. to userspace. FWIW see ftp://ftp-1.gwdg.de/pub/linux/misc/suser-jengelh/kernel/quad_dsp-1.5.1.tar.bz2 -`J' -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/