yann@635: #!/bin/sh
yann@2908: # (C) 2008 Yann E. MORIN <yann.morin.1998@free.fr>
yann@635: # Licensed under the GPL v.2
yann@635: 
yann@635: LIBDUMA_SO=
yann@635: 
yann@635: case "$1" in
yann@635:   -on)
yann@635:     case "${LD_PRELOAD}" in
yann@635:       *${LIBDUMA_SO}*) ;;
yann@635:       *) LD_PRELOAD="${LIBDUMA_SO} ${LD_PRELOAD}";;
yann@635:     esac
yann@635:     shift
yann@635:     ;;
yann@635:   -off)
yann@686:     # We use a suposedly POSIX-compliant shell: /bin/sh
yann@686:     #  -> we can't use "${LD_PRELOAD//${LIBDUMA_SO}/}", it's not POSIX
yann@686:     # We don't know if sed will be present on the target
yann@686:     #  -> we can't use $(echo "${LD_PRELOAD}" |sed -r -e "s|${LIBDUMA_SO}||;")
yann@686:     # So, iterate through LD_PRELOAD, and keep only those libs that
yann@686:     # are not "${LIBDUMA_SO}"
yann@686:     old_LD_PRELOAD="${LD_PRELOAD}"
yann@686:     LD_PRELOAD=
yann@686:     for lib in ${old_LD_PRELOAD}; do
yann@686:       [ "${lib}" = "${LIBDUMA_SO}" ] || LD_PRELOAD="${LD_PRELOAD} ${lib}"
yann@686:     done
yann@686:     unset old_LD_PRELOAD
yann@635:     shift
yann@635:     ;;
yann@635:   -show)
yann@635:     case "${LD_PRELOAD}" in
yann@635:       *${LIBDUMA_SO}*) echo "duma is enabled";;
yann@635:       *)               echo "duma is disabled";;
yann@635:     esac
yann@635:     exit 0
yann@635:     ;;
yann@635:   "")
yann@635:     cat <<_EOF_
yann@635: Usage:
yann@635:     . $0 <-on|-off|-show>
yann@635:         Sets, unsets or show DUMA usage.
yann@635:     $0 <executable [arg...]>
yann@635:         Execute 'executable' (with arguments 'args') using DUMA.
yann@635: _EOF_
yann@635:     false # Don't 'exit', we could well be source'd
yann@635:     ;;
yann@635:   *)
yann@635:     exec "$0" -on "$@"
yann@635:     ;;
yann@635: esac
yann@635: 
yann@635: export LD_PRELOAD
yann@635: if [ -n "$1" ]; then
yann@635:   exec "$@"
yann@635: fi