xref: /qemu/tests/qemu-iotests/common.qemu (revision f6c8c2e0) 
1#!/bin/bash
2#
3# This allows for launching of multiple QEMU instances, with independent
4# communication possible to each instance.
5#
6# Each instance can choose, at launch, to use either the QMP or the
7# HMP (monitor) interface.
8#
9# All instances are cleaned up via _cleanup_qemu, including killing the
10# running qemu instance.
11#
12# Copyright (C) 2014 Red Hat, Inc.
13#
14# This program is free software; you can redistribute it and/or modify
15# it under the terms of the GNU General Public License as published by
16# the Free Software Foundation; either version 2 of the License, or
17# (at your option) any later version.
18#
19# This program is distributed in the hope that it will be useful,
20# but WITHOUT ANY WARRANTY; without even the implied warranty of
21# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
22# GNU General Public License for more details.
23#
24# You should have received a copy of the GNU General Public License
25# along with this program.  If not, see <http://www.gnu.org/licenses/>.
26#
27
28QEMU_COMM_TIMEOUT=10
29
30QEMU_FIFO_IN="${TEST_DIR}/qmp-in-$$"
31QEMU_FIFO_OUT="${TEST_DIR}/qmp-out-$$"
32
33QEMU_HANDLE=0
34
35# If bash version is >= 4.1, these will be overwritten and dynamic
36# file descriptor values assigned.
37_out_fd=3
38_in_fd=4
39
40# Wait for expected QMP response from QEMU.  Will time out
41# after 10 seconds, which counts as failure.
42#
43# Override QEMU_COMM_TIMEOUT for a timeout different than the
44# default 10 seconds
45#
46# $1: The handle to use
47# $2+ All remaining arguments comprise the string to search for
48#    in the response.
49#
50# If $silent is set to anything but an empty string, then
51# response is not echoed out.
52function _timed_wait_for()
53{
54    local h=${1}
55    shift
56
57    QEMU_STATUS[$h]=0
58    while read -t ${QEMU_COMM_TIMEOUT} resp <&${QEMU_OUT[$h]}
59    do
60        if [ -z "${silent}" ]; then
61            echo "${resp}" | _filter_testdir | _filter_qemu \
62                           | _filter_qemu_io | _filter_qmp
63        fi
64        grep -q "${*}" < <(echo ${resp})
65        if [ $? -eq 0 ]; then
66            return
67        fi
68    done
69    QEMU_STATUS[$h]=-1
70    if [ -z "${qemu_error_no_exit}" ]; then
71        echo "Timeout waiting for ${*} on handle ${h}"
72        exit 1  # Timeout means the test failed
73    fi
74}
75
76
77# Sends QMP or HMP command to QEMU, and waits for the expected response
78#
79# $1:       QEMU handle to use
80# $2:       String of the QMP command to send
81# ${@: -1}  (Last string passed)
82#             String that the QEMU response should contain. If it is a null
83#             string, do not wait for a response
84#
85# Set qemu_cmd_repeat to the number of times to repeat the cmd
86# until either timeout, or a response.  If it is not set, or <=0,
87# then the command is only sent once.
88#
89# If $qemu_error_no_exit is set, then even if the expected response
90# is not seen, we will not exit.  $QEMU_STATUS[$1] will be set it -1 in
91# that case.
92function _send_qemu_cmd()
93{
94    local h=${1}
95    local count=1
96    local cmd=
97    local use_error=${qemu_error_no_exit}
98    shift
99
100    if [ ${qemu_cmd_repeat} -gt 0 ] 2>/dev/null; then
101        count=${qemu_cmd_repeat}
102        use_error="no"
103    fi
104    # This array element extraction is done to accommodate pathnames with spaces
105    cmd=${@: 1:${#@}-1}
106    shift $(($# - 1))
107
108    while [ ${count} -gt 0 ]
109    do
110        echo "${cmd}" >&${QEMU_IN[${h}]}
111        if [ -n "${1}" ]; then
112            qemu_error_no_exit=${use_error} _timed_wait_for ${h} "${1}"
113            if [ ${QEMU_STATUS[$h]} -eq 0 ]; then
114                return
115            fi
116        fi
117        let count--;
118    done
119    if [ ${QEMU_STATUS[$h]} -ne 0 ] && [ -z "${qemu_error_no_exit}" ]; then
120        echo "Timeout waiting for ${1} on handle ${h}"
121        exit 1 #Timeout means the test failed
122    fi
123}
124
125
126# Launch a QEMU process.
127#
128# Input parameters:
129# $qemu_comm_method: set this variable to 'monitor' (case insensitive)
130#                    to use the QEMU HMP monitor for communication.
131#                    Otherwise, the default of QMP is used.
132# Returns:
133# $QEMU_HANDLE: set to a handle value to communicate with this QEMU instance.
134#
135function _launch_qemu()
136{
137    local comm=
138    local fifo_out=
139    local fifo_in=
140
141    if (shopt -s nocasematch; [[ "${qemu_comm_method}" == "monitor" ]])
142    then
143        comm="-monitor stdio"
144    else
145        local qemu_comm_method="qmp"
146        comm="-monitor none -qmp stdio"
147    fi
148
149    fifo_out=${QEMU_FIFO_OUT}_${_QEMU_HANDLE}
150    fifo_in=${QEMU_FIFO_IN}_${_QEMU_HANDLE}
151    mkfifo "${fifo_out}"
152    mkfifo "${fifo_in}"
153
154    QEMU_NEED_PID='y'\
155    ${QEMU} -nographic -serial none ${comm} -machine accel=qtest "${@}" \
156                                                                >"${fifo_out}" \
157                                                                2>&1 \
158                                                                <"${fifo_in}" &
159
160    if [[ "${BASH_VERSINFO[0]}" -ge "5" ||
161        ("${BASH_VERSINFO[0]}" -ge "4"  &&  "${BASH_VERSINFO[1]}" -ge "1") ]]
162    then
163        # bash >= 4.1 required for automatic fd
164        exec {_out_fd}<"${fifo_out}"
165        exec {_in_fd}>"${fifo_in}"
166    else
167        let _out_fd++
168        let _in_fd++
169        eval "exec ${_out_fd}<'${fifo_out}'"
170        eval "exec ${_in_fd}>'${fifo_in}'"
171    fi
172
173    QEMU_OUT[${_QEMU_HANDLE}]=${_out_fd}
174    QEMU_IN[${_QEMU_HANDLE}]=${_in_fd}
175    QEMU_STATUS[${_QEMU_HANDLE}]=0
176
177    if [ "${qemu_comm_method}" == "qmp" ]
178    then
179        # Don't print response, since it has version information in it
180        silent=yes _timed_wait_for ${_QEMU_HANDLE} "capabilities"
181    fi
182    QEMU_HANDLE=${_QEMU_HANDLE}
183    let _QEMU_HANDLE++
184}
185
186
187# Silenty kills the QEMU process
188#
189# If $wait is set to anything other than the empty string, the process will not
190# be killed but only waited for, and any output will be forwarded to stdout. If
191# $wait is empty, the process will be killed and all output will be suppressed.
192function _cleanup_qemu()
193{
194    # QEMU_PID[], QEMU_IN[], QEMU_OUT[] all use same indices
195    for i in "${!QEMU_OUT[@]}"
196    do
197        local QEMU_PID
198        if [ -f "${TEST_DIR}/qemu-${i}.pid" ]; then
199            read QEMU_PID < "${TEST_DIR}/qemu-${i}.pid"
200            rm -f "${TEST_DIR}/qemu-${i}.pid"
201            if [ -z "${wait}" ] && [ -n "${QEMU_PID}" ]; then
202                kill -KILL ${QEMU_PID} 2>/dev/null
203            fi
204            if [ -n "${QEMU_PID}" ]; then
205                wait ${QEMU_PID} 2>/dev/null # silent kill
206            fi
207        fi
208
209        if [ -n "${wait}" ]; then
210            cat <&${QEMU_OUT[$i]} | _filter_testdir | _filter_qemu \
211                                  | _filter_qemu_io | _filter_qmp
212        fi
213        rm -f "${QEMU_FIFO_IN}_${i}" "${QEMU_FIFO_OUT}_${i}"
214        eval "exec ${QEMU_IN[$i]}<&-"   # close file descriptors
215        eval "exec ${QEMU_OUT[$i]}<&-"
216    done
217}
218