tools/syscalls/lttng-syscalls-extract.sh

   1 #!/bin/bash
   2 # SPDX-License-Identifier: (GPL-2.0-only or LGPL-2.1-only)
   3 # SPDX-FileCopyrightText: 2020 EfficiOS Inc.
   4
   5 set -eu
   6
   7 outfile="${1:-}"
   8
   9 if [ "$outfile" = "" ]; then
  10         echo "Specify an output file as first argument, it will be overwritten."
  11         exit 1
  12 fi
  13
  14 # Generate a random string to use as an identifier
  15 ident=$(tr -dc 'a-zA-Z0-9' < /dev/urandom | fold -w 8 | head -n1)
  16
  17 cd ../.. || exit 1
  18 make syscalls_extractor
  19
  20 sudo insmod ./src/lttng-wrapper.ko
  21 sudo insmod ./src/lttng-syscalls-extractor.ko ident="$ident" || true
  22 sudo rmmod lttng-wrapper
  23
  24 cd - || exit 1
  25
  26 sudo dmesg | sed -n -e 's/\(\[.*\] \)\?'"$ident"'//p' > "$outfile"
  27
  28 # Make sure we have both the start and end markers
  29 if grep -q -- '---START---' "$outfile"; then
  30         sed -i '/^---START---/d' "$outfile"
  31 else
  32         echo "Error: Start marker missing from dmesg output, your kernel log buffer is probably too small, set CONFIG_LOG_BUF_SHIFT to a bigger value."
  33         exit 1
  34 fi
  35
  36 if grep -q -- '---END---' "$outfile"; then
  37         sed -i '/^---END---/d' "$outfile"
  38 else
  39         echo "Error: End marker missing from dmesg output, something went wrong."
  40         exit 1
  41 fi