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Date: Fri, 12 Jan 2007 11:54:33 +0100 From: "Jesper Juhl" <jesper.juhl@...il.com> To: "Jan Engelhardt" <jengelh@...ux01.gwdg.de> Cc: congwen <congwen@...il.com>, linux-kernel <linux-kernel@...r.kernel.org> Subject: Re: How can I create or read/write a file in linux device driver? On 12/01/07, Jan Engelhardt <jengelh@...ux01.gwdg.de> wrote: > > On Jan 12 2007 11:27, Jesper Juhl wrote: > > On 12/01/07, congwen <congwen@...il.com> 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 > There is no good way. You simply should NOT do it. -- Jesper Juhl <jesper.juhl@...il.com> Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html Plain text mails only, please http://www.expita.com/nomime.html - 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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