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Re: [rfc/rfa] [1/4] SPU enhancements: preparation
- From: Daniel Jacobowitz <drow at false dot org>
- To: Ulrich Weigand <uweigand at de dot ibm dot com>
- Cc: gdb-patches at sourceware dot org
- Date: Mon, 4 Jun 2007 15:26:48 -0400
- Subject: Re: [rfc/rfa] [1/4] SPU enhancements: preparation
- References: <200706021931.l52JVBZQ005084@d12av02.megacenter.de.ibm.com>
On Sat, Jun 02, 2007 at 09:31:11PM +0200, Ulrich Weigand wrote:
> Hello,
>
> this is a small fix in preparation for adding extended SPU query support.
> Some files in spufs accessed via the spu_proc_xfer_spu routines in
> spu-linux-nat.c and gdbserver/spu-low.c are non-seekable. Currently,
> any attempt to access those at non-zero offset results in a failure.
>
> However, that is a problem when trying to use those files via the
> target object mechanism. For example, the target_read routine will
> first read a chunk at offset zero (which succeeds, and in fact is
> generally sufficient to retrieve the full contents as the non-seekable
> files are small). But then it attempts a second read at an offset
> corresponding to the length of the first chunk read, which now fails.
>
> This patch changes spu_proc_xfer_spu to simply return zero (i.e. no
> more data available) on any attempt to access a non-seekable spufs
> file at non-zero offset.
>
> Tested on spu-elf in conjunction with the other patches.
Seems reasonable to me.
--
Daniel Jacobowitz
CodeSourcery