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July 26, 2015 01:15
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#!/bin/bash | |
# | |
# Swap/Roll a file handle between processes. | |
# | |
# Posted at https://groups.google.com/forum/#!topic/alt.hackers/0ZMsMc5DvUw | |
# | |
# Usage: | |
# | |
# fdswap.sh <old logfile> <new logfile> [optional pids] | |
# fdswap.sh /var/log/logfile /tmp/logfile [pids] | |
# | |
# Author: Robert McKay | |
# Date: Tue Aug 14 13:36:35 BST 2007 | |
src=$1 | |
dst=$2 | |
shift | |
shift | |
pids=$* | |
for pid in ${pids:=$(/sbin/fuser $src)}; do | |
echo "${src} has ${pid} using it..." | |
( | |
echo "attach ${pid}" | |
echo 'call open("'${dst}'", 66, 0666)' | |
for ufd in $(ls -l /proc/${pid}/fd | grep ${src}\$ | awk '{print $9;}'); do | |
echo 'call dup2($1, '${ufd}')' | |
done | |
echo 'call close($1)' | |
echo 'detach' | |
echo 'quit' | |
sleep 3 | |
) | gdb -q -x - | |
done |
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