#!/bin/bash
#
# Copyright (C) 2021 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="pipe, no fork"

. "$TS_TOPDIR"/functions.sh
ts_init "$*"

ts_check_test_command "$TS_CMD_LSFD"
ts_check_test_command "$TS_HELPER_MKFDS"

ts_check_prog "stat"
ts_check_prog "readlink"

ts_cd "$TS_OUTDIR"

pipe_name()
{
    readlink /proc/$1/fd/$2
}

pipe_inode()
{
    stat -L -c %i /proc/$1/fd/$2
}

PID=
FD0=3
FD1=4
EXPR=

{
    coproc MKFDS { "$TS_HELPER_MKFDS" pipe-no-fork $FD0 $FD1 nonblock=-w rdup=$((FD0 + 2)) wdup=$((FD1 + 2)); }
    if read -u ${MKFDS[0]} PID; then
	EXPR='(PID == '"${PID}"') and ((FD == '"$FD0"') or (FD =='"$FD1"'))'
	${TS_CMD_LSFD} -n -o ASSOC,MODE,TYPE,SOURCE,FLAGS -Q "${EXPR}"
	echo 'ASSOC,MODE,TYPE,SOURCE,FLAGS': $?

	LSFD_PIDS=$(${TS_CMD_LSFD} --raw -n -o PID -Q "${EXPR}")
	echo 'PID[RUN]:' $?
	[ "${LSFD_PIDS}" == "$(printf '%d\n%d' ${PID} ${PID})" ]
	echo 'PID[STR]:' $?

	LSFD_NAMES=$(${TS_CMD_LSFD} --raw -n -o NAME -Q "${EXPR}")
	echo 'NAMES[RUN]:' $?
	[ "${LSFD_NAMES}" == "$(printf '%s\n%s' $(pipe_name $PID $FD0) $(pipe_name $PID $FD1))" ]
	echo 'NAMES[STR]:' $?

	LSFD_INODES=$(${TS_CMD_LSFD} --raw -n -o INODE -Q "${EXPR}")
	echo 'INODES[RUN]:' $?
	[ "${LSFD_INODES}" == "$(printf '%d\n%d' $(pipe_inode $PID $FD0) $(pipe_inode $PID $FD1))" ]
	echo 'INODES[STR]:' $?

	LSFD_ENDPOINTS=$(${TS_CMD_LSFD} --raw -n -o ASSOC,ENDPOINTS -Q "${EXPR}")
	echo 'ENDPOINTS[RUN]:' $?
	mkfds=${TS_HELPER_MKFDS##*/}

	line0=$(printf '%d ' $FD0)
	line0+=$(printf '%d,%s,%d%c%c' $PID $mkfds $FD1 - w)
	line0+='\x0a'
	line0+=$(printf '%d,%s,%d%c%c' $PID $mkfds $((FD0 + 2)) r -)
	line0+='\x0a'
	line0+=$(printf '%d,%s,%d%c%c' $PID $mkfds $((FD1 + 2)) - w)

	line1=$(printf '%d ' $FD1)
	line1+=$(printf '%d,%s,%d%c%c' $PID $mkfds $FD0 r -)
	line1+='\x0a'
	line1+=$(printf '%d,%s,%d%c%c' $PID $mkfds $((FD0 + 2)) r -)
	line1+='\x0a'
	line1+=$(printf '%d,%s,%d%c%c' $PID $mkfds $((FD1 + 2)) - w)

	expected=$(printf '%s\n%s' "${line0}" "${line1}")
	if [ "${LSFD_ENDPOINTS}" == "${expected}" ]; then
	    echo 'ENDPOINTS[STR]:' $?
	else
	    echo "lsfd output:"
	    echo "${LSFD_ENDPOINTS}"
	    echo "expectation:"
	    echo "${expected}"
	fi

	EXPR='(PID == '"${PID}"') and (FD == '"$FD0"')'
	LSFD_ENDPOINTS_JSON=$(${TS_CMD_LSFD} -J --raw -n -o ASSOC,ENDPOINTS -Q "${EXPR}")
	echo 'ASSOC,ENDPOINTS (JSON)': $?
	EXPECTED_LSFD_ENDPOINTS_JSON=$(cat<<EOF
{
   "lsfd": [
      {
         "assoc": "$FD0",
         "endpoints": [
             "$PID,test_mkfds,${FD1}-w", "$PID,test_mkfds,$((FD0 + 2))r-", "$PID,test_mkfds,$((FD1 + 2))-w"
         ]
      }
   ]
}
EOF
	)
	if [[ "$EXPECTED_LSFD_ENDPOINTS_JSON" == "${LSFD_ENDPOINTS_JSON}" ]]; then
	    echo EXPECTED_LSFD_ENDPOINTS_JSON == LSFD_ENDPOINTS_JSON
	else
	    echo LSFD_ENDPOINTS_JSON: "${LSFD_ENDPOINTS_JSON}"
	    echo EXPECTED_LSFD_ENDPOINTS_JSON: "${EXPECTED_LSFD_ENDPOINTS_JSON}"
	fi

	echo DONE >&"${MKFDS[1]}"
    fi
    wait ${MKFDS_PID}
} > $TS_OUTPUT 2>&1

ts_finalize