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#!/bin/bash
#
# Copyright (C) 2022 Masatake YAMATO <yamato@redhat.com>
#
# This file is part of util-linux.
#
# This file is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This file is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
TS_TOPDIR="${0%/*}/../.."
TS_DESC="pidfd"
. "$TS_TOPDIR"/functions.sh
ts_init "$*"
. "$TS_SELF/lsfd-functions.bash"
ts_check_test_command "$TS_CMD_LSFD"
ts_check_test_command "$TS_HELPER_MKFDS"
ts_check_prog "ps"
ts_cd "$TS_OUTDIR"
[ "$(ps --no-headers -o comm 1)" = 'systemd' ] || ts_skip "pid 1 is not systemd"
PID=
FD=3
TARGET=1
EXPR="(PID != ${TARGET}) and (FD == 3) and (PIDFD.PID == ${TARGET})"
{
coproc MKFDS { "$TS_HELPER_MKFDS" pidfd $FD target-pid=${TARGET} ; }
if read -u ${MKFDS[0]} PID; then
${TS_CMD_LSFD} -n -o ASSOC,STTYPE,SOURCE,NAME,PIDFD.COMM,PIDFD.PID -p "${PID}" -p ${TARGET} -Q "${EXPR}"
echo 'ASSOC,STTYPE,SOURCE,NAME,PIDFD.COMM,PIDFD.PID': $?
echo DONE >&"${MKFDS[1]}"
fi
wait ${MKFDS_PID}
} > $TS_OUTPUT 2>&1
if [ "$?" == "$TS_EXIT_NOTSUPP" ]; then
ts_skip "pidfd_open(2) is not available"
fi
ts_finalize
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