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#!/bin/bash
#
# fdswap
#
# Orignal author: ingvarha
# ref: https://ingvarha.wordpress.com/2010/07/10/changing-a-process-file-descriptor-on-the-fly/
if [ "$2" = "" ]; then
<<HELP cat
Usage: ${0##*/} /path/to/oldfile /path/to/newfile [pids]
Example: ${0##*/} /var/log/daemon.log /var/log/newvolume/daemon.log 1234
Example: ${0##*/} /dev/pts/53 /dev/null 2345
HELP
exit 0
fi
if ! gdb --version &>/dev/null; then
echo "Unable to find gdb."
exit 1
fi
src="$1"; dst="$2"; shift; shift
pids=$*
for pid in ${pids:=$( /sbin/fuser $src | cut -d ':' -f 2 )};
do
echo "src=$src, dst=$dst"
echo "$src has $pid using it"
cmd=$(mktemp)
{
echo "attach $pid"
echo 'call (int)open("'$dst'", 66, 0666)'
for ufd in $(LANG=C ls -l /proc/$pid/fd | \
grep "$src"\$ | awk ' { print $9; } ');
do echo 'call (int)dup2($1,'"$ufd"')'; done
echo 'call (int)close($1)'
echo 'detach'; echo 'quit'
sleep 5
} | tee /dev/tty >$cmd
gdb -x $cmd
done
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