tools/syscalls/lttng-syscalls-extract.sh

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