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SubjectRe: [PATCH] perf test shell: Add -D to check dynamic symbols for ubuntu/debian
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ping


On 12/27/2017 04:50 PM, Li Zhijian wrote:
> On Ubuntu and Debian, we can't find any symbol including "inet_pton" from 'nm -g'
> root@vm-lkp-nex04-8G-5 ~# nm -g /lib/x86_64-linux-gnu/libc-2.25.so | grep inet_pton
> nm: /lib/x86_64-linux-gnu/libc-2.25.so: no symbols
>
> it looks libc.so has different symbol compositions at different distros
>
> Usage: nm [option(s)] [file(s)]
> List symbols in [file(s)] (a.out by default).
> The options are:
> ...snip...
> -D, --dynamic Display dynamic symbols instead of normal symbols
> --defined-only Display only defined symbols
> -e (ignored)
> -f, --format=FORMAT Use the output format FORMAT. FORMAT can be `bsd',
> `sysv' or `posix'. The default is `bsd'
> -g, --extern-only Display only external symbols
>
> I tested both debian/ubuntu and RHEL, they work as expected
>
> CC: Thomas Richter <tmricht@linux.vnet.ibm.com>
> CC: Arnaldo Carvalho de Melo <acme@redhat.com>
> Signed-off-by: Li Zhijian <lizhijian@cn.fujitsu.com>
> ---
> tools/perf/tests/shell/trace+probe_libc_inet_pton.sh | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/tests/shell/trace+probe_libc_inet_pton.sh b/tools/perf/tests/shell/trace+probe_libc_inet_pton.sh
> index 8b3da21..f939bd6 100755
> --- a/tools/perf/tests/shell/trace+probe_libc_inet_pton.sh
> +++ b/tools/perf/tests/shell/trace+probe_libc_inet_pton.sh
> @@ -11,7 +11,7 @@
> . $(dirname $0)/lib/probe.sh
>
> libc=$(grep -w libc /proc/self/maps | head -1 | sed -r 's/.*[[:space:]](\/.*)/\1/g')
> -nm -g $libc 2>/dev/null | fgrep -q inet_pton || exit 254
> +nm -gD $libc 2>/dev/null | fgrep -q inet_pton || exit 254
>
> trace_libc_inet_pton_backtrace() {
> idx=0


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