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#!/bin/sh
#
# This script processes strace -ff -tt output. It merges the contents of all
# STRACE_LOG.PID files and sorts them, printing result on the standard output.
#
# Copyright (c) 2012-2021 The strace developers.
#
# SPDX-License-Identifier: LGPL-2.1-or-later
show_usage()
{
cat <<__EOF__
Usage: ${0##*/} STRACE_LOG
Finds all STRACE_LOG.PID files, adds PID prefix to every line,
then combines and sorts them, and prints result to standard output.
It is assumed that STRACE_LOGs were produced by strace with -tt[t]
option which prints timestamps (otherwise sorting won't do any good).
__EOF__
}
dd='\([0-9][0-9]\)'
ds='\([0-9][0-9]*\)'
if [ $# -ne 1 ]; then
show_usage >&2
exit 1
elif [ "$1" = '--help' ]; then
show_usage
exit 0
fi
logfile=$1
iterate_logfiles()
{
local file suffix
for file in "$logfile".*; do
[ -f "$file" ] || continue
suffix=${file#"$logfile".}
[ "$suffix" -gt 0 ] 2> /dev/null ||
continue
"$@" "$suffix" "$file"
done
}
max_suffix_length=0
process_suffix()
{
local suffix len
suffix="$1"; shift
len=${#suffix}
if [ $len -gt $max_suffix_length ]; then
max_suffix_length=$len
fi
}
process_logfile()
{
local suffix file pid
suffix="$1"; shift
file="$1"; shift
pid=$(printf "%-*s" $max_suffix_length $suffix)
# Some strace logs have last line which is not '\n' terminated,
# so add extra newline to every file.
# Empty lines are removed later.
sed -n "s/^\($dd:\)\?\($dd:\)\?\($ds\.\)\?$ds /\2\4\6\7 $pid \0/p" < "$file"
echo
}
iterate_logfiles process_suffix
[ $max_suffix_length -gt 0 ] || {
echo >&2 "${0##*/}: $logfile: strace output not found"
exit 1
}
iterate_logfiles process_logfile |
sort -s -n -k1,1 |
sed -n 's/^[0-9][0-9]* //p' |
grep -v '^$'
rc=$?
[ $rc -eq 1 ] &&
echo >&2 "${0##*/}: $logfile: strace output not found"
exit $rc