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 trace_libc_inet_pton_backtrace() {
  12         idx=0
  13         expected[0]="PING.*bytes"
  14         expected[1]="64 bytes from ::1.*"
  15         expected[2]=".*ping statistics.*"
  16         expected[3]=".*packets transmitted.*"
  17         expected[4]="rtt min.*"
  18         expected[5]="[0-9]+\.[0-9]+[[:space:]]+probe_libc:inet_pton:\([[:xdigit:]]+\)"
  19         expected[6]=".*inet_pton[[:space:]]\(/usr/lib.*/libc-[0-9]+\.[0-9]+\.so\)$"
  20         expected[7]="getaddrinfo[[:space:]]\(/usr/lib.*/libc-[0-9]+\.[0-9]+\.so\)$"
  21         expected[8]=".*\(.*/bin/ping.*\)$"
  22
  23         perf trace --no-syscalls -e probe_libc:inet_pton/max-stack=3/ ping -6 -c 1 ::1 |& grep -v ^$ | while read line ; do
  24                 echo $line
  25                 echo "$line" | egrep -q "${expected[$idx]}"
  26                 if [ $? -ne 0 ] ; then
  27                         printf "FAIL: expected backtrace entry %d \"%s\" got \"%s\"\n" $idx "${expected[$idx]}" "$line"
  28                         exit 1
  29                 fi
  30                 let idx+=1
  31                 [ $idx -eq 9 ] && break
  32         done
  33 }
  34
  35 perf probe -q /lib64/libc-*.so inet_pton && \
  36 trace_libc_inet_pton_backtrace
  37 err=$?
  38 rm -f ${file}
  39 perf probe -q -d probe_libc:inet_pton
  40 exit $err