# # Copyright (C) 2013 Intel Corporation # # SPDX-License-Identifier: MIT # # This module provides a class for starting qemu images using runqemu. # It's used by testimage.bbclass. import subprocess import os import sys import time import signal import re import socket import select import errno import string import threading import codecs import logging import tempfile from oeqa.utils.dump import HostDumper from collections import defaultdict import importlib # Get Unicode non printable control chars control_range = list(range(0,32))+list(range(127,160)) control_chars = [chr(x) for x in control_range if chr(x) not in string.printable] re_control_char = re.compile('[%s]' % re.escape("".join(control_chars))) class QemuRunner: def __init__(self, machine, rootfs, display, tmpdir, deploy_dir_image, logfile, boottime, dump_dir, dump_host_cmds, use_kvm, logger, use_slirp=False, serial_ports=2, boot_patterns = defaultdict(str), use_ovmf=False, workdir=None, tmpfsdir=None): # Popen object for runqemu self.runqemu = None self.runqemu_exited = False # pid of the qemu process that runqemu will start self.qemupid = None # target ip - from the command line or runqemu output self.ip = None # host ip - where qemu is running self.server_ip = None # target ip netmask self.netmask = None self.machine = machine self.rootfs = rootfs self.display = display self.tmpdir = tmpdir self.deploy_dir_image = deploy_dir_image self.logfile = logfile self.boottime = boottime self.logged = False self.thread = None self.use_kvm = use_kvm self.use_ovmf = use_ovmf self.use_slirp = use_slirp self.serial_ports = serial_ports self.msg = '' self.boot_patterns = boot_patterns self.tmpfsdir = tmpfsdir self.runqemutime = 300 if not workdir: workdir = os.getcwd() self.qemu_pidfile = workdir + '/pidfile_' + str(os.getpid()) self.host_dumper = HostDumper(dump_host_cmds, dump_dir) self.monitorpipe = None self.logger = logger # Whether we're expecting an exit and should show related errors self.canexit = False # Enable testing other OS's # Set commands for target communication, and default to Linux ALWAYS # Other OS's or baremetal applications need to provide their # own implementation passing it through QemuRunner's constructor # or by passing them through TESTIMAGE_BOOT_PATTERNS[flag] # provided variables, where is one of the mentioned below. accepted_patterns = ['search_reached_prompt', 'send_login_user', 'search_login_succeeded', 'search_cmd_finished'] default_boot_patterns = defaultdict(str) # Default to the usual paterns used to communicate with the target default_boot_patterns['search_reached_prompt'] = ' login:' default_boot_patterns['send_login_user'] = 'root\n' default_boot_patterns['search_login_succeeded'] = r"root@[a-zA-Z0-9\-]+:~#" default_boot_patterns['search_cmd_finished'] = r"[a-zA-Z0-9]+@[a-zA-Z0-9\-]+:~#" # Only override patterns that were set e.g. login user TESTIMAGE_BOOT_PATTERNS[send_login_user] = "webserver\n" for pattern in accepted_patterns: if not self.boot_patterns[pattern]: self.boot_patterns[pattern] = default_boot_patterns[pattern] def create_socket(self): try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.setblocking(0) sock.bind(("127.0.0.1",0)) sock.listen(2) port = sock.getsockname()[1] self.logger.debug("Created listening socket for qemu serial console on: 127.0.0.1:%s" % port) return (sock, port) except socket.error: sock.close() raise def decode_qemulog(self, todecode): # Sanitize the data received from qemu as it may contain control characters msg = todecode.decode("utf-8", errors='ignore') msg = re_control_char.sub('', msg) return msg def log(self, msg): if self.logfile: msg = self.decode_qemulog(msg) self.msg += msg with codecs.open(self.logfile, "a", encoding="utf-8") as f: f.write("%s" % msg) def getOutput(self, o): import fcntl fl = fcntl.fcntl(o, fcntl.F_GETFL) fcntl.fcntl(o, fcntl.F_SETFL, fl | os.O_NONBLOCK) try: return os.read(o.fileno(), 1000000).decode("utf-8") except BlockingIOError: return "" def handleSIGCHLD(self, signum, frame): if self.runqemu and self.runqemu.poll(): if self.runqemu.returncode: self.logger.error('runqemu exited with code %d' % self.runqemu.returncode) self.logger.error('Output from runqemu:\n%s' % self.getOutput(self.runqemu.stdout)) self.stop() self._dump_host() def start(self, qemuparams = None, get_ip = True, extra_bootparams = None, runqemuparams='', launch_cmd=None, discard_writes=True): env = os.environ.copy() if self.display: env["DISPLAY"] = self.display # Set this flag so that Qemu doesn't do any grabs as SDL grabs # interact badly with screensavers. env["QEMU_DONT_GRAB"] = "1" if not os.path.exists(self.rootfs): self.logger.error("Invalid rootfs %s" % self.rootfs) return False if not os.path.exists(self.tmpdir): self.logger.error("Invalid TMPDIR path %s" % self.tmpdir) return False else: env["OE_TMPDIR"] = self.tmpdir if not os.path.exists(self.deploy_dir_image): self.logger.error("Invalid DEPLOY_DIR_IMAGE path %s" % self.deploy_dir_image) return False else: env["DEPLOY_DIR_IMAGE"] = self.deploy_dir_image if self.tmpfsdir: env["RUNQEMU_TMPFS_DIR"] = self.tmpfsdir if not launch_cmd: launch_cmd = 'runqemu %s' % ('snapshot' if discard_writes else '') if self.use_kvm: self.logger.debug('Using kvm for runqemu') launch_cmd += ' kvm' else: self.logger.debug('Not using kvm for runqemu') if not self.display: launch_cmd += ' nographic' if self.use_slirp: launch_cmd += ' slirp' if self.use_ovmf: launch_cmd += ' ovmf' launch_cmd += ' %s %s' % (runqemuparams, self.machine) if self.rootfs.endswith('.vmdk'): self.logger.debug('Bypassing VMDK rootfs for runqemu') else: launch_cmd += ' %s' % (self.rootfs) return self.launch(launch_cmd, qemuparams=qemuparams, get_ip=get_ip, extra_bootparams=extra_bootparams, env=env) def launch(self, launch_cmd, get_ip = True, qemuparams = None, extra_bootparams = None, env = None): # use logfile to determine the recipe-sysroot-native path and # then add in the site-packages path components and add that # to the python sys.path so qmp.py can be found. python_path = os.path.dirname(os.path.dirname(self.logfile)) python_path += "/recipe-sysroot-native/usr/lib/qemu-python" sys.path.append(python_path) importlib.invalidate_caches() try: qmp = importlib.import_module("qmp") except Exception as e: self.logger.error("qemurunner: qmp.py missing, please ensure it's installed (%s)" % str(e)) return False # Path relative to tmpdir used as cwd for qemu below to avoid unix socket path length issues qmp_file = "." + next(tempfile._get_candidate_names()) qmp_param = ' -S -qmp unix:./%s,server,wait' % (qmp_file) qmp_port = self.tmpdir + "/" + qmp_file # Create a second socket connection for debugging use, # note this will NOT cause qemu to block waiting for the connection qmp_file2 = "." + next(tempfile._get_candidate_names()) qmp_param += ' -qmp unix:./%s,server,nowait' % (qmp_file2) qmp_port2 = self.tmpdir + "/" + qmp_file2 self.logger.info("QMP Available for connection at %s" % (qmp_port2)) try: if self.serial_ports >= 2: self.threadsock, threadport = self.create_socket() self.server_socket, self.serverport = self.create_socket() except socket.error as msg: self.logger.error("Failed to create listening socket: %s" % msg[1]) return False bootparams = ' printk.time=1' if extra_bootparams: bootparams = bootparams + ' ' + extra_bootparams # Ask QEMU to store the QEMU process PID in file, this way we don't have to parse running processes # and analyze descendents in order to determine it. if os.path.exists(self.qemu_pidfile): os.remove(self.qemu_pidfile) self.qemuparams = 'bootparams="{0}" qemuparams="-pidfile {1} {2}"'.format(bootparams, self.qemu_pidfile, qmp_param) if qemuparams: self.qemuparams = self.qemuparams[:-1] + " " + qemuparams + " " + '\"' if self.serial_ports >= 2: launch_cmd += ' tcpserial=%s:%s %s' % (threadport, self.serverport, self.qemuparams) else: launch_cmd += ' tcpserial=%s %s' % (self.serverport, self.qemuparams) self.origchldhandler = signal.getsignal(signal.SIGCHLD) signal.signal(signal.SIGCHLD, self.handleSIGCHLD) self.logger.debug('launchcmd=%s' % (launch_cmd)) # FIXME: We pass in stdin=subprocess.PIPE here to work around stty # blocking at the end of the runqemu script when using this within # oe-selftest (this makes stty error out immediately). There ought # to be a proper fix but this will suffice for now. self.runqemu = subprocess.Popen(launch_cmd, shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, stdin=subprocess.PIPE, preexec_fn=os.setpgrp, env=env, cwd=self.tmpdir) output = self.runqemu.stdout launch_time = time.time() # # We need the preexec_fn above so that all runqemu processes can easily be killed # (by killing their process group). This presents a problem if this controlling # process itself is killed however since those processes don't notice the death # of the parent and merrily continue on. # # Rather than hack runqemu to deal with this, we add something here instead. # Basically we fork off another process which holds an open pipe to the parent # and also is setpgrp. If/when the pipe sees EOF from the parent dieing, it kills # the process group. This is like pctrl's PDEATHSIG but for a process group # rather than a single process. # r, w = os.pipe() self.monitorpid = os.fork() if self.monitorpid: os.close(r) self.monitorpipe = os.fdopen(w, "w") else: # child process os.setpgrp() os.close(w) r = os.fdopen(r) x = r.read() os.killpg(os.getpgid(self.runqemu.pid), signal.SIGTERM) os._exit(0) self.logger.debug("runqemu started, pid is %s" % self.runqemu.pid) self.logger.debug("waiting at most %d seconds for qemu pid (%s)" % (self.runqemutime, time.strftime("%D %H:%M:%S"))) endtime = time.time() + self.runqemutime while not self.is_alive() and time.time() < endtime: if self.runqemu.poll(): if self.runqemu_exited: self.logger.warning("runqemu during is_alive() test") return False if self.runqemu.returncode: # No point waiting any longer self.logger.warning('runqemu exited with code %d' % self.runqemu.returncode) self._dump_host() self.logger.warning("Output from runqemu:\n%s" % self.getOutput(output)) self.stop() return False time.sleep(0.5) if self.runqemu_exited: self.logger.warning("runqemu after timeout") if self.runqemu.returncode: self.logger.warning('runqemu exited with code %d' % self.runqemu.returncode) if not self.is_alive(): self.logger.error("Qemu pid didn't appear in %d seconds (%s)" % (self.runqemutime, time.strftime("%D %H:%M:%S"))) qemu_pid = None if os.path.isfile(self.qemu_pidfile): with open(self.qemu_pidfile, 'r') as f: qemu_pid = f.read().strip() self.logger.error("Status information, poll status: %s, pidfile exists: %s, pidfile contents %s, proc pid exists %s" % (self.runqemu.poll(), os.path.isfile(self.qemu_pidfile), str(qemu_pid), os.path.exists("/proc/" + str(qemu_pid)))) # Dump all processes to help us to figure out what is going on... ps = subprocess.Popen(['ps', 'axww', '-o', 'pid,ppid,pri,ni,command '], stdout=subprocess.PIPE).communicate()[0] processes = ps.decode("utf-8") self.logger.debug("Running processes:\n%s" % processes) self._dump_host() op = self.getOutput(output) self.stop() if op: self.logger.error("Output from runqemu:\n%s" % op) else: self.logger.error("No output from runqemu.\n") return False # Create the client socket for the QEMU Monitor Control Socket # This will allow us to read status from Qemu if the the process # is still alive self.logger.debug("QMP Initializing to %s" % (qmp_port)) # chdir dance for path length issues with unix sockets origpath = os.getcwd() try: os.chdir(os.path.dirname(qmp_port)) try: from qmp.legacy import QEMUMonitorProtocol self.qmp = QEMUMonitorProtocol(os.path.basename(qmp_port)) except OSError as msg: self.logger.warning("Failed to initialize qemu monitor socket: %s File: %s" % (msg, msg.filename)) return False self.logger.debug("QMP Connecting to %s" % (qmp_port)) if not os.path.exists(qmp_port) and self.is_alive(): self.logger.debug("QMP Port does not exist waiting for it to be created") endtime = time.time() + self.runqemutime while not os.path.exists(qmp_port) and self.is_alive() and time.time() < endtime: self.logger.info("QMP port does not exist yet!") time.sleep(0.5) if not os.path.exists(qmp_port) and self.is_alive(): self.logger.warning("QMP Port still does not exist but QEMU is alive") return False try: # set timeout value for all QMP calls self.qmp.settimeout(self.runqemutime) self.qmp.connect() connect_time = time.time() self.logger.info("QMP connected to QEMU at %s and took %.2f seconds" % (time.strftime("%D %H:%M:%S"), time.time() - launch_time)) except OSError as msg: self.logger.warning("Failed to connect qemu monitor socket: %s File: %s" % (msg, msg.filename)) return False except qmp.legacy.QMPError as msg: self.logger.warning("Failed to communicate with qemu monitor: %s" % (msg)) return False finally: os.chdir(origpath) # We worry that mmap'd libraries may cause page faults which hang the qemu VM for periods # causing failures. Before we "start" qemu, read through it's mapped files to try and # ensure we don't hit page faults later mapdir = "/proc/" + str(self.qemupid) + "/map_files/" try: for f in os.listdir(mapdir): try: linktarget = os.readlink(os.path.join(mapdir, f)) if not linktarget.startswith("/") or linktarget.startswith("/dev") or "deleted" in linktarget: continue with open(linktarget, "rb") as readf: data = True while data: data = readf.read(4096) except FileNotFoundError: continue # Centos7 doesn't allow us to read /map_files/ except PermissionError: pass # Release the qemu process to continue running self.run_monitor('cont') self.logger.info("QMP released QEMU at %s and took %.2f seconds from connect" % (time.strftime("%D %H:%M:%S"), time.time() - connect_time)) # We are alive: qemu is running out = self.getOutput(output) netconf = False # network configuration is not required by default self.logger.debug("qemu started in %.2f seconds - qemu procces pid is %s (%s)" % (time.time() - (endtime - self.runqemutime), self.qemupid, time.strftime("%D %H:%M:%S"))) cmdline = '' if get_ip: with open('/proc/%s/cmdline' % self.qemupid) as p: cmdline = p.read() # It is needed to sanitize the data received # because is possible to have control characters cmdline = re_control_char.sub(' ', cmdline) try: if self.use_slirp: tcp_ports = cmdline.split("hostfwd=tcp:")[1] ip, tcp_ports = tcp_ports.split(":")[:2] host_port = tcp_ports[:tcp_ports.find('-')] self.ip = "%s:%s" % (ip, host_port) else: ips = re.findall(r"((?:[0-9]{1,3}\.){3}[0-9]{1,3})", cmdline.split("ip=")[1]) self.ip = ips[0] self.server_ip = ips[1] self.logger.debug("qemu cmdline used:\n{}".format(cmdline)) except (IndexError, ValueError): # Try to get network configuration from runqemu output match = re.match(r'.*Network configuration: (?:ip=)*([0-9.]+)::([0-9.]+):([0-9.]+).*', out, re.MULTILINE | re.DOTALL) if match: self.ip, self.server_ip, self.netmask = match.groups() # network configuration is required as we couldn't get it # from the runqemu command line, so qemu doesn't run kernel # and guest networking is not configured netconf = True else: self.logger.error("Couldn't get ip from qemu command line and runqemu output! " "Here is the qemu command line used:\n%s\n" "and output from runqemu:\n%s" % (cmdline, out)) self._dump_host() self.stop() return False self.logger.debug("Target IP: %s" % self.ip) self.logger.debug("Server IP: %s" % self.server_ip) if self.serial_ports >= 2: self.thread = LoggingThread(self.log, self.threadsock, self.logger) self.thread.start() if not self.thread.connection_established.wait(self.boottime): self.logger.error("Didn't receive a console connection from qemu. " "Here is the qemu command line used:\n%s\nand " "output from runqemu:\n%s" % (cmdline, out)) self.stop_thread() return False self.logger.debug("Output from runqemu:\n%s", out) self.logger.debug("Waiting at most %d seconds for login banner (%s)" % (self.boottime, time.strftime("%D %H:%M:%S"))) endtime = time.time() + self.boottime socklist = [self.server_socket] reachedlogin = False stopread = False qemusock = None bootlog = b'' data = b'' while time.time() < endtime and not stopread: try: sread, swrite, serror = select.select(socklist, [], [], 5) except InterruptedError: continue for sock in sread: if sock is self.server_socket: qemusock, addr = self.server_socket.accept() qemusock.setblocking(0) socklist.append(qemusock) socklist.remove(self.server_socket) self.logger.debug("Connection from %s:%s" % addr) else: # try to avoid reading only a single character at a time time.sleep(0.1) data = data + sock.recv(1024) if data: bootlog += data if self.serial_ports < 2: # this socket has mixed console/kernel data, log it to logfile self.log(data) data = b'' decodedlog = self.decode_qemulog(bootlog) if self.boot_patterns['search_reached_prompt'] in decodedlog: self.server_socket = qemusock stopread = True reachedlogin = True self.logger.debug("Reached login banner in %.2f seconds (%s)" % (time.time() - (endtime - self.boottime), time.strftime("%D %H:%M:%S"))) else: # no need to check if reachedlogin unless we support multiple connections self.logger.debug("QEMU socket disconnected before login banner reached. (%s)" % time.strftime("%D %H:%M:%S")) socklist.remove(sock) sock.close() stopread = True if not reachedlogin: if time.time() >= endtime: self.logger.warning("Target didn't reach login banner in %d seconds (%s)" % (self.boottime, time.strftime("%D %H:%M:%S"))) tail = lambda l: "\n".join(l.splitlines()[-25:]) bootlog = self.decode_qemulog(bootlog) # in case bootlog is empty, use tail qemu log store at self.msg lines = tail(bootlog if bootlog else self.msg) self.logger.warning("Last 25 lines of text (%d):\n%s" % (len(bootlog), lines)) self.logger.warning("Check full boot log: %s" % self.logfile) self._dump_host() self.stop() return False # If we are not able to login the tests can continue try: (status, output) = self.run_serial(self.boot_patterns['send_login_user'], raw=True, timeout=120) if re.search(self.boot_patterns['search_login_succeeded'], output): self.logged = True self.logger.debug("Logged in as %s in serial console" % self.boot_patterns['send_login_user'].replace("\n", "")) if netconf: # configure guest networking cmd = "ifconfig eth0 %s netmask %s up\n" % (self.ip, self.netmask) output = self.run_serial(cmd, raw=True)[1] if re.search(r"root@[a-zA-Z0-9\-]+:~#", output): self.logger.debug("configured ip address %s", self.ip) else: self.logger.debug("Couldn't configure guest networking") else: self.logger.warning("Couldn't login into serial console" " as %s using blank password" % self.boot_patterns['send_login_user'].replace("\n", "")) self.logger.warning("The output:\n%s" % output) except: self.logger.warning("Serial console failed while trying to login") return True def stop(self): if hasattr(self, "origchldhandler"): signal.signal(signal.SIGCHLD, self.origchldhandler) self.stop_thread() self.stop_qemu_system() if self.runqemu: if hasattr(self, "monitorpid"): os.kill(self.monitorpid, signal.SIGKILL) self.logger.debug("Sending SIGTERM to runqemu") try: os.killpg(os.getpgid(self.runqemu.pid), signal.SIGTERM) except OSError as e: if e.errno != errno.ESRCH: raise try: outs, errs = self.runqemu.communicate(timeout=self.runqemutime) if outs: self.logger.info("Output from runqemu:\n%s", outs.decode("utf-8")) if errs: self.logger.info("Stderr from runqemu:\n%s", errs.decode("utf-8")) except subprocess.TimeoutExpired: self.logger.debug("Sending SIGKILL to runqemu") os.killpg(os.getpgid(self.runqemu.pid), signal.SIGKILL) if not self.runqemu.stdout.closed: self.logger.info("Output from runqemu:\n%s" % self.getOutput(self.runqemu.stdout)) self.runqemu.stdin.close() self.runqemu.stdout.close() self.runqemu_exited = True if hasattr(self, 'qmp') and self.qmp: self.qmp.close() self.qmp = None if hasattr(self, 'server_socket') and self.server_socket: self.server_socket.close() self.server_socket = None if hasattr(self, 'threadsock') and self.threadsock: self.threadsock.close() self.threadsock = None self.qemupid = None self.ip = None if os.path.exists(self.qemu_pidfile): try: os.remove(self.qemu_pidfile) except FileNotFoundError as e: # We raced, ignore pass if self.monitorpipe: self.monitorpipe.close() def stop_qemu_system(self): if self.qemupid: try: # qemu-system behaves well and a SIGTERM is enough os.kill(self.qemupid, signal.SIGTERM) except ProcessLookupError as e: self.logger.warning('qemu-system ended unexpectedly') def stop_thread(self): if self.thread and self.thread.is_alive(): self.thread.stop() self.thread.join() def allowexit(self): self.canexit = True if self.thread: self.thread.allowexit() def restart(self, qemuparams = None): self.logger.warning("Restarting qemu process") if self.runqemu.poll() is None: self.stop() if self.start(qemuparams): return True return False def is_alive(self): if not self.runqemu or self.runqemu.poll() is not None or self.runqemu_exited: return False if os.path.isfile(self.qemu_pidfile): # when handling pidfile, qemu creates the file, stat it, lock it and then write to it # so it's possible that the file has been created but the content is empty pidfile_timeout = time.time() + 3 while time.time() < pidfile_timeout: with open(self.qemu_pidfile, 'r') as f: qemu_pid = f.read().strip() # file created but not yet written contents if not qemu_pid: time.sleep(0.5) continue else: if os.path.exists("/proc/" + qemu_pid): self.qemupid = int(qemu_pid) return True return False def run_monitor(self, command, args=None, timeout=60): if hasattr(self, 'qmp') and self.qmp: self.qmp.settimeout(timeout) if args is not None: return self.qmp.cmd(command, args) else: return self.qmp.cmd(command) def run_serial(self, command, raw=False, timeout=60): # Returns (status, output) where status is 1 on success and 0 on error # We assume target system have echo to get command status if not raw: command = "%s; echo $?\n" % command data = '' status = 0 self.server_socket.sendall(command.encode('utf-8')) start = time.time() end = start + timeout while True: now = time.time() if now >= end: data += "<<< run_serial(): command timed out after %d seconds without output >>>\r\n\r\n" % timeout break try: sread, _, _ = select.select([self.server_socket],[],[], end - now) except InterruptedError: continue if sread: # try to avoid reading single character at a time time.sleep(0.1) answer = self.server_socket.recv(1024) if answer: data += answer.decode('utf-8') # Search the prompt to stop if re.search(self.boot_patterns['search_cmd_finished'], data): break else: if self.canexit: return (1, "") raise Exception("No data on serial console socket, connection closed?") if data: if raw: status = 1 else: # Remove first line (command line) and last line (prompt) data = data[data.find('$?\r\n')+4:data.rfind('\r\n')] index = data.rfind('\r\n') if index == -1: status_cmd = data data = "" else: status_cmd = data[index+2:] data = data[:index] if (status_cmd == "0"): status = 1 return (status, str(data)) def _dump_host(self): self.host_dumper.create_dir("qemu") self.logger.warning("Qemu ended unexpectedly, dump data from host" " is in %s" % self.host_dumper.dump_dir) self.host_dumper.dump_host() # This class is for reading data from a socket and passing it to logfunc # to be processed. It's completely event driven and has a straightforward # event loop. The mechanism for stopping the thread is a simple pipe which # will wake up the poll and allow for tearing everything down. class LoggingThread(threading.Thread): def __init__(self, logfunc, sock, logger): self.connection_established = threading.Event() self.serversock = sock self.logfunc = logfunc self.logger = logger self.readsock = None self.running = False self.canexit = False self.errorevents = select.POLLERR | select.POLLHUP | select.POLLNVAL self.readevents = select.POLLIN | select.POLLPRI threading.Thread.__init__(self, target=self.threadtarget) def threadtarget(self): try: self.eventloop() finally: self.teardown() def run(self): self.logger.debug("Starting logging thread") self.readpipe, self.writepipe = os.pipe() threading.Thread.run(self) def stop(self): self.logger.debug("Stopping logging thread") if self.running: os.write(self.writepipe, bytes("stop", "utf-8")) def teardown(self): self.logger.debug("Tearing down logging thread") self.close_socket(self.serversock) if self.readsock is not None: self.close_socket(self.readsock) self.close_ignore_error(self.readpipe) self.close_ignore_error(self.writepipe) self.running = False def allowexit(self): self.canexit = True def eventloop(self): poll = select.poll() event_read_mask = self.errorevents | self.readevents poll.register(self.serversock.fileno()) poll.register(self.readpipe, event_read_mask) breakout = False self.running = True self.logger.debug("Starting thread event loop") while not breakout: events = poll.poll() for event in events: # An error occurred, bail out if event[1] & self.errorevents: raise Exception(self.stringify_event(event[1])) # Event to stop the thread if self.readpipe == event[0]: self.logger.debug("Stop event received") breakout = True break # A connection request was received elif self.serversock.fileno() == event[0]: self.logger.debug("Connection request received") self.readsock, _ = self.serversock.accept() self.readsock.setblocking(0) poll.unregister(self.serversock.fileno()) poll.register(self.readsock.fileno(), event_read_mask) self.logger.debug("Setting connection established event") self.connection_established.set() # Actual data to be logged elif self.readsock.fileno() == event[0]: data = self.recv(1024) self.logfunc(data) # Since the socket is non-blocking make sure to honor EAGAIN # and EWOULDBLOCK. def recv(self, count): try: data = self.readsock.recv(count) except socket.error as e: if e.errno == errno.EAGAIN or e.errno == errno.EWOULDBLOCK: return b'' else: raise if data is None: raise Exception("No data on read ready socket") elif not data: # This actually means an orderly shutdown # happened. But for this code it counts as an # error since the connection shouldn't go away # until qemu exits. if not self.canexit: raise Exception("Console connection closed unexpectedly") return b'' return data def stringify_event(self, event): val = '' if select.POLLERR == event: val = 'POLLER' elif select.POLLHUP == event: val = 'POLLHUP' elif select.POLLNVAL == event: val = 'POLLNVAL' return val def close_socket(self, sock): sock.shutdown(socket.SHUT_RDWR) sock.close() def close_ignore_error(self, fd): try: os.close(fd) except OSError: pass