Em Tue, Nov 14, 2017 at 10:34:09AM -0300, Arnaldo Carvalho de Melo escreveu:
> > Different name, same contents, need to look at the inode... ;-\
>
> Nah, lets ask the kernel how is it that it sees libc, please test the
> following, works for me:
BTW, this is what I sticked on that cset:
Committer changes:
We can't really use ldd for libc, as in some systems, such as x86_64, it
has hardlinks and then ldd sees one and the kernel the other, so grep
for libc in /proc/self/maps to get the one we'll receive from
PERF_RECORD_MMAP.
- Arnaldo
> 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 7a84d73324e3..8b3da21a08f1 100755
> --- a/tools/perf/tests/shell/trace+probe_libc_inet_pton.sh
> +++ b/tools/perf/tests/shell/trace+probe_libc_inet_pton.sh
> @@ -10,8 +10,8 @@
>
> . $(dirname $0)/lib/probe.sh
>
> -ld=$(realpath /lib64/ld*.so.* | uniq)
> -libc=$(echo $ld | sed 's/ld/libc/g')
> +libc=$(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
>
> trace_libc_inet_pton_backtrace() {
> idx=0
> @@ -37,6 +37,9 @@ trace_libc_inet_pton_backtrace() {
> done
> }
>
> +# Check for IPv6 interface existence
> +ip a sh lo | fgrep -q inet6 || exit 2
> +
> skip_if_no_perf_probe && \
> perf probe -q $libc inet_pton && \
> trace_libc_inet_pton_backtrace
