From: Tommy Reynolds <reynolds@redhat.com>
To: ptb@it.uc3m.es
Cc: linux-kernel@vger.kernel.org
Subject: Re: share buffer between user and kernel?
Date: Mon, 15 Oct 2001 11:12:19 -0500 [thread overview]
Message-ID: <20011015111219.4cd14672.reynolds@redhat.com> (raw)
In-Reply-To: <200110090703.f9973Z601609@oboe.it.uc3m.es>
In-Reply-To: <200110090703.f9973Z601609@oboe.it.uc3m.es>
It was a dark and stormy night. Suddenly "Peter T. Breuer" <ptb@it.uc3m.es> spoke:
> What is the currently approved method of sharing a buffer between
> user space and kernel space, so that I can avoid one or two
> copy_to/from_user?
Two basic choices here:
1) Allocate the buffer in kernel space and use the mmap() method to give the
user-space program access to it; and
2) Allocate the buffer in you user application program and use the KIOBUF method
to give the kernel and/or hardware access to your buffer. Look in
<linux/iobuf.h> for kernel-level inspiration.
---------------------------------------------+-----------------------------
Tommy Reynolds | mailto: <reynolds@redhat.com>
Red Hat, Inc., Embedded Development Services | Phone: +1.256.704.9286
307 Wynn Drive NW, Huntsville, AL 35805 USA | FAX: +1.236.837.3839
Senior Software Developer | Mobile: +1.919.641.2923
prev parent reply other threads:[~2001-10-15 16:11 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-10-09 7:03 Peter T. Breuer
2001-10-15 16:12 ` Tommy Reynolds [this message]
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