Re: [Valgrind-developers] perl or sed wizardry needed

[Eliot M. <mo...@cs...>]

On 7/27/2014 7:51 AM, Florian Krohm wrote:
> Hi,
>
> on this RHEL5 s390 machine the poll system call gets interrupted
> occasionally which makes the gdbserver_tests/nlvgdbsigqueue fail like so:
>
> --- nlvgdbsigqueue.stderr.exp	2014-06-22 03:48:42.000000000 -0400
> +++ nlvgdbsigqueue.stderr.out	2014-07-26 08:16:24.000000000 -0400
> @@ -8,4 +8,10 @@
>   London ready to sleep and/or burn
>   Petaouchnok ready to sleep and/or burn
>   main ready to sleep and/or burn
> +error 4 Interrupted system call
> +VG_(poll) failed (old kernel ?) retrying ...
> +error 4 Interrupted system call
> +VG_(poll) failed (old kernel ?) retrying ...
> +error 4 Interrupted system call
> +VG_(poll) failed (old kernel ?) retrying ...
>   Gdb request to kill this process
>
> In this run poll got interrupted three times, each time contributing
>
> error 4 Interrupted system call
> VG_(poll) failed (old kernel ?) retrying ...
>
> to the output. How would I filter out such a pair of lines? (I know how
> to filter them out individually, but Philippe does not like that).
> The closest I got was to add
>
> perl  -0777 -p -e   's/error 4 Interrupted system call\nVG_\(poll\)
> failed \(old kernel \?\) retrying ...//g' |
>
> to the filter_stderr script but that replaces each such pair of lines
> with a single blank line. So it isn't really of any use as we don't know
> how often poll gets interrupted.
>
> Any ideas how to do this properly?

My suggestion is to try including the trailing \n in the pattern being replaced.

Eliot Moss