tools/perf/tests/shell/trace+probe_libc_inet_pton.sh

   1 # probe libc's inet_pton & backtrace it with ping
   2
   3 # Installs a probe on libc's inet_pton function, that will use uprobes,
   4 # then use 'perf trace' on a ping to localhost asking for just one packet
   5 # with the a backtrace 3 levels deep, check that it is what we expect.
   6 # This needs no debuginfo package, all is done using the libc ELF symtab
   7 # and the CFI info in the binaries.
   8
   9 # Arnaldo Carvalho de Melo <acme@kernel.org>, 2017
  10
  11 . $(dirname $0)/lib/probe.sh
  12
  13 libc=$(grep -w libc /proc/self/maps | head -1 | sed -r 's/.*[[:space:]](\/.*)/\1/g')
  14 nm -g $libc 2>/dev/null | fgrep -q inet_pton || exit 254
  15
  16 trace_libc_inet_pton_backtrace() {
  17         idx=0
  18         expected[0]="PING.*bytes"
  19         expected[1]="64 bytes from ::1.*"
  20         expected[2]=".*ping statistics.*"
  21         expected[3]=".*packets transmitted.*"
  22         expected[4]="rtt min.*"
  23         expected[5]="[0-9]+\.[0-9]+[[:space:]]+probe_libc:inet_pton:\([[:xdigit:]]+\)"
  24         expected[6]=".*inet_pton[[:space:]]\($libc\)$"
  25         expected[7]="getaddrinfo[[:space:]]\($libc\)$"
  26         expected[8]=".*\(.*/bin/ping.*\)$"
  27
  28         perf trace --no-syscalls -e probe_libc:inet_pton/max-stack=3/ ping -6 -c 1 ::1 2>&1 | grep -v ^$ | while read line ; do
  29                 echo $line
  30                 echo "$line" | egrep -q "${expected[$idx]}"
  31                 if [ $? -ne 0 ] ; then
  32                         printf "FAIL: expected backtrace entry %d \"%s\" got \"%s\"\n" $idx "${expected[$idx]}" "$line"
  33                         exit 1
  34                 fi
  35                 let idx+=1
  36                 [ $idx -eq 9 ] && break
  37         done
  38 }
  39
  40 # Check for IPv6 interface existence
  41 ip a sh lo | fgrep -q inet6 || exit 2
  42
  43 skip_if_no_perf_probe && \
  44 perf probe -q $libc inet_pton && \
  45 trace_libc_inet_pton_backtrace
  46 err=$?
  47 rm -f ${file}
  48 perf probe -q -d probe_libc:inet_pton
  49 exit $err