Re: [Qemu-devel] [PATCH v8 3/4] guest agent: qemu-ga daemon

[Luiz Capitulino <lcapitulino@redhat.com>]

On Wed, 20 Jul 2011 15:05:39 -0500
Michael Roth <mdroth@linux.vnet.ibm.com> wrote:

> On 07/20/2011 03:01 PM, Michael Roth wrote:
> > On 07/20/2011 02:31 PM, Luiz Capitulino wrote:
> >> On Wed, 20 Jul 2011 14:25:06 -0500
> >> Michael Roth<mdroth@linux.vnet.ibm.com> wrote:
> >>
> >>> On 07/20/2011 12:56 PM, Luiz Capitulino wrote:
> >>>> On Tue, 19 Jul 2011 15:41:54 -0500
> >>>> Michael Roth<mdroth@linux.vnet.ibm.com> wrote:
> >>>>
> >>>>> This is the actual guest daemon, it listens for requests over a
> >>>>> virtio-serial/isa-serial/unix socket channel and routes them through
> >>>>> to dispatch routines, and writes the results back to the channel in
> >>>>> a manner similar to QMP.
> >>>>>
> >>>>> A shorthand invocation:
> >>>>>
> >>>>> qemu-ga -d
> >>>>>
> >>>>> Is equivalent to:
> >>>>>
> >>>>> qemu-ga -m virtio-serial -p /dev/virtio-ports/org.qemu.guest_agent.0 \
> >>>>> -f /var/run/qemu-ga.pid -d
> >>>>>
> >>>>> Signed-off-by: Michael Roth<mdroth@linux.vnet.ibm.com>
> >>>>> ---
> >>>>> Makefile | 8 +-
> >>>>> configure | 1 +
> >>>>> qemu-ga.c | 667 ++++++++++++++++++++++++++++++++++++++++++++++++
> >>>>> qga/guest-agent-core.h | 4 +
> >>>>> 4 files changed, 677 insertions(+), 3 deletions(-)
> >>>>> create mode 100644 qemu-ga.c
> >>>>>
> >>>>> diff --git a/Makefile b/Makefile
> >>>>> index b8cdf0e..0d2e33d 100644
> >>>>> --- a/Makefile
> >>>>> +++ b/Makefile
> >>>>> @@ -140,7 +140,7 @@ endif
> >>>>> ######################################################################
> >>>>>
> >>>>> qemu-img.o: qemu-img-cmds.h
> >>>>> -qemu-img.o qemu-tool.o qemu-nbd.o qemu-io.o cmd.o:
> >>>>> $(GENERATED_HEADERS)
> >>>>> +qemu-img.o qemu-tool.o qemu-nbd.o qemu-io.o cmd.o qemu-ga.o:
> >>>>> $(GENERATED_HEADERS)
> >>>>>
> >>>>> qemu-img$(EXESUF): qemu-img.o qemu-tool.o qemu-error.o
> >>>>> $(oslib-obj-y) $(trace-obj-y) $(block-obj-y) $(qobject-obj-y)
> >>>>> $(version-obj-y) qemu-timer-common.o
> >>>>>
> >>>>> @@ -184,13 +184,15 @@ test-qmp-commands: test-qmp-commands.o
> >>>>> qfloat.o qint.o qdict.o qstring.o qlist.o
> >>>>>
> >>>>> QGALIB=qga/guest-agent-command-state.o
> >>>>>
> >>>>> +qemu-ga$(EXESUF): qemu-ga.o $(QGALIB) qemu-tool.o qemu-error.o
> >>>>> error.o $(oslib-obj-y) $(trace-obj-y) $(block-obj-y)
> >>>>> $(qobject-obj-y) $(version-obj-y) $(qapi-obj-y) qemu-timer-common.o
> >>>>> qemu-sockets.o module.o qapi/qmp-dispatch.o qapi/qmp-registry.o
> >>>>> +
> >>>>> QEMULIBS=libhw32 libhw64 libuser libdis libdis-user
> >>>>>
> >>>>> clean:
> >>>>> # avoid old build problems by removing potentially incorrect old files
> >>>>> rm -f config.mak op-i386.h opc-i386.h gen-op-i386.h op-arm.h
> >>>>> opc-arm.h gen-op-arm.h
> >>>>> rm -f qemu-options.def
> >>>>> - rm -f *.o *.d *.a *.lo $(TOOLS) TAGS cscope.* *.pod *~ */*~
> >>>>> + rm -f *.o *.d *.a *.lo $(TOOLS) qemu-ga TAGS cscope.* *.pod *~ */*~
> >>>>> rm -Rf .libs
> >>>>> rm -f slirp/*.o slirp/*.d audio/*.o audio/*.d block/*.o block/*.d
> >>>>> net/*.o net/*.d fsdev/*.o fsdev/*.d ui/*.o ui/*.d qapi/*.o qapi/*.d
> >>>>> qga/*.o qga/*.d
> >>>>> rm -f qemu-img-cmds.h
> >>>>> @@ -386,4 +388,4 @@ tarbin:
> >>>>> $(mandir)/man8/qemu-nbd.8
> >>>>>
> >>>>> # Include automatically generated dependency files
> >>>>> --include $(wildcard *.d audio/*.d slirp/*.d block/*.d net/*.d
> >>>>> ui/*.d qapi/*.d)
> >>>>> +-include $(wildcard *.d audio/*.d slirp/*.d block/*.d net/*.d
> >>>>> ui/*.d qapi/*.d qga/*.d)
> >>>>> diff --git a/configure b/configure
> >>>>> index 6a03002..445f674 100755
> >>>>> --- a/configure
> >>>>> +++ b/configure
> >>>>> @@ -2532,6 +2532,7 @@ if test "$softmmu" = yes ; then
> >>>>> tools="qemu-img\$(EXESUF) qemu-io\$(EXESUF) $tools"
> >>>>> if [ "$linux" = "yes" -o "$bsd" = "yes" -o "$solaris" = "yes" ] ; then
> >>>>> tools="qemu-nbd\$(EXESUF) $tools"
> >>>>> + tools="qemu-ga\$(EXESUF) $tools"
> >>>>> if [ "$check_utests" = "yes" ]; then
> >>>>> tools="check-qint check-qstring check-qdict check-qlist $tools"
> >>>>> tools="check-qfloat check-qjson $tools"
> >>>>> diff --git a/qemu-ga.c b/qemu-ga.c
> >>>>> new file mode 100644
> >>>>> index 0000000..eb09100
> >>>>> --- /dev/null
> >>>>> +++ b/qemu-ga.c
> >>>>> @@ -0,0 +1,667 @@
> >>>>> +/*
> >>>>> + * QEMU Guest Agent
> >>>>> + *
> >>>>> + * Copyright IBM Corp. 2011
> >>>>> + *
> >>>>> + * Authors:
> >>>>> + * Adam Litke<aglitke@linux.vnet.ibm.com>
> >>>>> + * Michael Roth<mdroth@linux.vnet.ibm.com>
> >>>>> + *
> >>>>> + * This work is licensed under the terms of the GNU GPL, version 2
> >>>>> or later.
> >>>>> + * See the COPYING file in the top-level directory.
> >>>>> + */
> >>>>> +#include<stdlib.h>
> >>>>> +#include<stdio.h>
> >>>>> +#include<stdbool.h>
> >>>>> +#include<glib.h>
> >>>>> +#include<gio/gio.h>
> >>>>> +#include<getopt.h>
> >>>>> +#include<termios.h>
> >>>>> +#include<syslog.h>
> >>>>> +#include "qemu_socket.h"
> >>>>> +#include "json-streamer.h"
> >>>>> +#include "json-parser.h"
> >>>>> +#include "qint.h"
> >>>>> +#include "qjson.h"
> >>>>> +#include "qga/guest-agent-core.h"
> >>>>> +#include "module.h"
> >>>>> +#include "signal.h"
> >>>>> +#include "qerror.h"
> >>>>> +#include "error_int.h"
> >>>>> +
> >>>>> +#define QGA_VIRTIO_PATH_DEFAULT
> >>>>> "/dev/virtio-ports/org.qemu.guest_agent.0"
> >>>>> +#define QGA_PIDFILE_DEFAULT "/var/run/qemu-ga.pid"
> >>>>> +#define QGA_BAUDRATE_DEFAULT B38400 /* for isa-serial channels */
> >>>>> +#define QGA_TIMEOUT_DEFAULT 30*1000 /* ms */
> >>>>> +
> >>>>> +struct GAState {
> >>>>> + JSONMessageParser parser;
> >>>>> + GMainLoop *main_loop;
> >>>>> + guint conn_id;
> >>>>> + GSocket *conn_sock;
> >>>>> + GIOChannel *conn_channel;
> >>>>> + guint listen_id;
> >>>>> + GSocket *listen_sock;
> >>>>> + GIOChannel *listen_channel;
> >>>>> + const char *path;
> >>>>> + const char *method;
> >>>>> + bool virtio; /* fastpath to check for virtio to deal with poll()
> >>>>> quirks */
> >>>>> + GACommandState *command_state;
> >>>>> + GLogLevelFlags log_level;
> >>>>> + FILE *log_file;
> >>>>> + bool logging_enabled;
> >>>>> +};
> >>>>> +
> >>>>> +static struct GAState *ga_state;
> >>>>> +
> >>>>> +static void quit_handler(int sig)
> >>>>> +{
> >>>>> + g_debug("recieved signal num %d, quitting", sig);
> >>>>> +
> >>>>> + if (g_main_loop_is_running(ga_state->main_loop)) {
> >>>>> + g_main_loop_quit(ga_state->main_loop);
> >>>>> + }
> >>>>> +}
> >>>>> +
> >>>>> +static void register_signal_handlers(void)
> >>>>> +{
> >>>>> + struct sigaction sigact;
> >>>>> + int ret;
> >>>>> +
> >>>>> + memset(&sigact, 0, sizeof(struct sigaction));
> >>>>> + sigact.sa_handler = quit_handler;
> >>>>> +
> >>>>> + ret = sigaction(SIGINT,&sigact, NULL);
> >>>>> + if (ret == -1) {
> >>>>> + g_error("error configuring signal handler: %s", strerror(errno));
> >>>>> + exit(EXIT_FAILURE);
> >>>>> + }
> >>>>> + ret = sigaction(SIGTERM,&sigact, NULL);
> >>>>> + if (ret == -1) {
> >>>>> + g_error("error configuring signal handler: %s", strerror(errno));
> >>>>> + }
> >>>>> +}
> >>>>> +
> >>>>> +static void usage(const char *cmd)
> >>>>> +{
> >>>>> + printf(
> >>>>> +"Usage: %s -c<channel_opts>\n"
> >>>>> +"QEMU Guest Agent %s\n"
> >>>>> +"\n"
> >>>>> +" -m, --method transport method: one of unix-listen,
> >>>>> virtio-serial, or\n"
> >>>>> +" isa-serial (virtio-serial is the default)\n"
> >>>>> +" -p, --path device/socket path (%s is the default for
> >>>>> virtio-serial)\n"
> >>>>> +" -l, --logfile set logfile path, logs to stderr by default\n"
> >>>>> +" -f, --pidfile specify pidfile (default is %s)\n"
> >>>>> +" -v, --verbose log extra debugging information\n"
> >>>>> +" -V, --version print version information and exit\n"
> >>>>> +" -d, --daemonize become a daemon\n"
> >>>>> +" -h, --help display this help and exit\n"
> >>>>> +"\n"
> >>>>> +"Report bugs to<mdroth@linux.vnet.ibm.com>\n"
> >>>>> + , cmd, QGA_VERSION, QGA_VIRTIO_PATH_DEFAULT, QGA_PIDFILE_DEFAULT);
> >>>>> +}
> >>>>> +
> >>>>> +static void conn_channel_close(GAState *s);
> >>>>> +
> >>>>> +static const char *ga_log_level_str(GLogLevelFlags level)
> >>>>> +{
> >>>>> + switch (level& G_LOG_LEVEL_MASK) {
> >>>>> + case G_LOG_LEVEL_ERROR:
> >>>>> + return "error";
> >>>>> + case G_LOG_LEVEL_CRITICAL:
> >>>>> + return "critical";
> >>>>> + case G_LOG_LEVEL_WARNING:
> >>>>> + return "warning";
> >>>>> + case G_LOG_LEVEL_MESSAGE:
> >>>>> + return "message";
> >>>>> + case G_LOG_LEVEL_INFO:
> >>>>> + return "info";
> >>>>> + case G_LOG_LEVEL_DEBUG:
> >>>>> + return "debug";
> >>>>> + default:
> >>>>> + return "user";
> >>>>> + }
> >>>>> +}
> >>>>> +
> >>>>> +bool ga_logging_enabled(GAState *s)
> >>>>> +{
> >>>>> + return s->logging_enabled;
> >>>>> +}
> >>>>> +
> >>>>> +void ga_disable_logging(GAState *s)
> >>>>> +{
> >>>>> + s->logging_enabled = false;
> >>>>> +}
> >>>>> +
> >>>>> +void ga_enable_logging(GAState *s)
> >>>>> +{
> >>>>> + s->logging_enabled = true;
> >>>>> +}
> >>>>> +
> >>>>> +static void ga_log(const gchar *domain, GLogLevelFlags level,
> >>>>> + const gchar *msg, gpointer opaque)
> >>>>> +{
> >>>>> + GAState *s = opaque;
> >>>>> + GTimeVal time;
> >>>>> + const char *level_str = ga_log_level_str(level);
> >>>>> +
> >>>>> + if (!ga_logging_enabled(s)) {
> >>>>> + return;
> >>>>> + }
> >>>>> +
> >>>>> + level&= G_LOG_LEVEL_MASK;
> >>>>> + if (g_strcmp0(domain, "syslog") == 0) {
> >>>>> + syslog(LOG_INFO, "%s: %s", level_str, msg);
> >>>>> + } else if (level& s->log_level) {
> >>>>> + g_get_current_time(&time);
> >>>>> + fprintf(s->log_file,
> >>>>> + "%lu.%lu: %s: %s\n", time.tv_sec, time.tv_usec, level_str, msg);
> >>>>> + fflush(s->log_file);
> >>>>> + }
> >>>>> +}
> >>>>> +
> >>>>> +static void become_daemon(const char *pidfile)
> >>>>> +{
> >>>>> + pid_t pid, sid;
> >>>>> + int pidfd;
> >>>>> + char *pidstr = NULL;
> >>>>> +
> >>>>> + pid = fork();
> >>>>> + if (pid< 0) {
> >>>>> + exit(EXIT_FAILURE);
> >>>>> + }
> >>>>> + if (pid> 0) {
> >>>>> + exit(EXIT_SUCCESS);
> >>>>> + }
> >>>>> +
> >>>>> + pidfd = open(pidfile, O_CREAT|O_WRONLY|O_EXCL, S_IRUSR|S_IWUSR);
> >>>>> + if (pidfd == -1) {
> >>>>> + g_critical("Cannot create pid file, %s", strerror(errno));
> >>>>> + exit(EXIT_FAILURE);
> >>>>> + }
> >>>>> +
> >>>>> + if (asprintf(&pidstr, "%d", getpid()) == -1) {
> >>>>> + g_critical("Cannot allocate memory");
> >>>>> + goto fail;
> >>>>> + }
> >>>>> + if (write(pidfd, pidstr, strlen(pidstr)) != strlen(pidstr)) {
> >>>>> + free(pidstr);
> >>>>> + g_critical("Failed to write pid file");
> >>>>> + goto fail;
> >>>>> + }
> >>>>> +
> >>>>> + umask(0);
> >>>>> + sid = setsid();
> >>>>> + if (sid< 0) {
> >>>>> + goto fail;
> >>>>> + }
> >>>>> + if ((chdir("/"))< 0) {
> >>>>> + goto fail;
> >>>>> + }
> >>>>> +
> >>>>> + close(STDIN_FILENO);
> >>>>> + close(STDOUT_FILENO);
> >>>>> + close(STDERR_FILENO);
> >>>>> + free(pidstr);
> >>>>> + return;
> >>>>> +
> >>>>> +fail:
> >>>>> + unlink(pidfile);
> >>>>> + g_critical("failed to daemonize");
> >>>>> + exit(EXIT_FAILURE);
> >>>>> +}
> >>>>> +
> >>>>> +static int conn_channel_send_buf(GIOChannel *channel, const char
> >>>>> *buf,
> >>>>> + gsize count)
> >>>>> +{
> >>>>> + GError *err = NULL;
> >>>>> + gsize written = 0;
> >>>>> + GIOStatus status;
> >>>>> +
> >>>>> + while (count) {
> >>>>> + status = g_io_channel_write_chars(channel, buf,
> >>>>> count,&written,&err);
> >>>>> + g_debug("sending data, count: %d", (int)count);
> >>>>> + if (err != NULL) {
> >>>>> + g_warning("error sending newline: %s", err->message);
> >>>>> + return err->code;
> >>>>> + }
> >>>>> + if (status == G_IO_STATUS_ERROR || status == G_IO_STATUS_EOF) {
> >>>>> + return -EPIPE;
> >>>>> + }
> >>>>> +
> >>>>> + if (status == G_IO_STATUS_NORMAL) {
> >>>>> + count -= written;
> >>>>> + }
> >>>>> + }
> >>>>> +
> >>>>> + return 0;
> >>>>> +}
> >>>>> +
> >>>>> +static int conn_channel_send_payload(GIOChannel *channel, QObject
> >>>>> *payload)
> >>>>> +{
> >>>>> + int ret = 0;
> >>>>> + const char *buf;
> >>>>> + QString *payload_qstr;
> >>>>> + GError *err = NULL;
> >>>>> +
> >>>>> + g_assert(payload&& channel);
> >>>>> +
> >>>>> + payload_qstr = qobject_to_json(payload);
> >>>>> + if (!payload_qstr) {
> >>>>> + return -EINVAL;
> >>>>> + }
> >>>>> +
> >>>>> + qstring_append_chr(payload_qstr, '\n');
> >>>>> + buf = qstring_get_str(payload_qstr);
> >>>>> + ret = conn_channel_send_buf(channel, buf, strlen(buf));
> >>>>> + if (ret) {
> >>>>> + goto out_free;
> >>>>> + }
> >>>>> +
> >>>>> + g_io_channel_flush(channel,&err);
> >>>>> + if (err != NULL) {
> >>>>> + g_warning("error flushing payload: %s", err->message);
> >>>>> + ret = err->code;
> >>>>> + goto out_free;
> >>>>> + }
> >>>>> +
> >>>>> +out_free:
> >>>>> + QDECREF(payload_qstr);
> >>>>> + if (err) {
> >>>>> + g_error_free(err);
> >>>>> + }
> >>>>> + return ret;
> >>>>> +}
> >>>>> +
> >>>>> +static void process_command(GAState *s, QDict *req)
> >>>>> +{
> >>>>> + QObject *rsp = NULL;
> >>>>> + int ret;
> >>>>> +
> >>>>> + g_assert(req);
> >>>>> + g_debug("processing command");
> >>>>> + rsp = qmp_dispatch(QOBJECT(req));
> >>>>> + if (rsp) {
> >>>>> + ret = conn_channel_send_payload(s->conn_channel, rsp);
> >>>>> + if (ret) {
> >>>>> + g_warning("error sending payload: %s", strerror(ret));
> >>>>> + }
> >>>>> + qobject_decref(rsp);
> >>>>> + } else {
> >>>>> + g_warning("error getting response");
> >>>>> + }
> >>>>> +}
> >>>>> +
> >>>>> +/* handle requests/control events coming in over the channel */
> >>>>> +static void process_event(JSONMessageParser *parser, QList *tokens)
> >>>>> +{
> >>>>> + GAState *s = container_of(parser, GAState, parser);
> >>>>> + QObject *obj;
> >>>>> + QDict *qdict;
> >>>>> + Error *err = NULL;
> >>>>> + int ret;
> >>>>> +
> >>>>> + g_assert(s&& parser);
> >>>>> +
> >>>>> + g_debug("process_event: called");
> >>>>> + obj = json_parser_parse_err(tokens, NULL,&err);
> >>>>> + if (err || !obj || qobject_type(obj) != QTYPE_QDICT) {
> >>>>> + qobject_decref(obj);
> >>>>> + qdict = qdict_new();
> >>>>> + if (!err) {
> >>>>> + g_warning("failed to parse event: unknown error");
> >>>>> + error_set(&err, QERR_JSON_PARSING);
> >>>>> + } else {
> >>>>> + g_warning("failed to parse event: %s", error_get_pretty(err));
> >>>>> + }
> >>>>> + qdict_put_obj(qdict, "error", error_get_qobject(err));
> >>>>> + error_free(err);
> >>>>> + } else {
> >>>>> + qdict = qobject_to_qdict(obj);
> >>>>> + }
> >>>>> +
> >>>>> + g_assert(qdict);
> >>>>> +
> >>>>> + /* handle host->guest commands */
> >>>>> + if (qdict_haskey(qdict, "execute")) {
> >>>>> + process_command(s, qdict);
> >>>>> + } else {
> >>>>> + if (!qdict_haskey(qdict, "error")) {
> >>>>> + QDECREF(qdict);
> >>>>> + qdict = qdict_new();
> >>>>> + g_warning("unrecognized payload format");
> >>>>> + error_set(&err, QERR_UNSUPPORTED);
> >>>>> + qdict_put_obj(qdict, "error", error_get_qobject(err));
> >>>>> + error_free(err);
> >>>>> + }
> >>>>> + ret = conn_channel_send_payload(s->conn_channel, QOBJECT(qdict));
> >>>>> + if (ret) {
> >>>>> + g_warning("error sending payload: %s", strerror(ret));
> >>>>> + }
> >>>>> + }
> >>>>> +
> >>>>> + QDECREF(qdict);
> >>>>> +}
> >>>>> +
> >>>>> +static gboolean conn_channel_read(GIOChannel *channel,
> >>>>> GIOCondition condition,
> >>>>> + gpointer data)
> >>>>> +{
> >>>>> + GAState *s = data;
> >>>>> + gchar buf[1024];
> >>>>> + gsize count;
> >>>>> + GError *err = NULL;
> >>>>> + memset(buf, 0, 1024);
> >>>>> + GIOStatus status = g_io_channel_read_chars(channel, buf, 1024,
> >>>>> +&count,&err);
> >>>>> + if (err != NULL) {
> >>>>> + g_warning("error reading channel: %s", err->message);
> >>>>> + conn_channel_close(s);
> >>>>> + g_error_free(err);
> >>>>> + return false;
> >>>>> + }
> >>>>> + switch (status) {
> >>>>> + case G_IO_STATUS_ERROR:
> >>>>> + g_warning("problem");
> >>>>> + return false;
> >>>>> + case G_IO_STATUS_NORMAL:
> >>>>> + g_debug("read data, count: %d, data: %s", (int)count, buf);
> >>>>> + json_message_parser_feed(&s->parser, (char *)buf, (int)count);
> >>>>> + case G_IO_STATUS_AGAIN:
> >>>>> + /* virtio causes us to spin here when no process is attached to
> >>>>> + * host-side chardev. sleep a bit to mitigate this
> >>>>> + */
> >>>>> + if (s->virtio) {
> >>>>> + usleep(100*1000);
> >>>>> + }
> >>>>> + return true;
> >>>>> + case G_IO_STATUS_EOF:
> >>>>> + g_debug("received EOF");
> >>>>> + conn_channel_close(s);
> >>>>> + if (s->virtio) {
> >>>>> + return true;
> >>>>> + }
> >>>>> + return false;
> >>>>> + default:
> >>>>> + g_warning("unknown channel read status, closing");
> >>>>> + conn_channel_close(s);
> >>>>> + return false;
> >>>>> + }
> >>>>> + return true;
> >>>>> +}
> >>>>> +
> >>>>> +static int conn_channel_add(GAState *s, int fd)
> >>>>> +{
> >>>>> + GIOChannel *conn_channel;
> >>>>> + guint conn_id;
> >>>>> + GError *err = NULL;
> >>>>> +
> >>>>> + g_assert(s&& !s->conn_channel);
> >>>>> + conn_channel = g_io_channel_unix_new(fd);
> >>>>> + g_assert(conn_channel);
> >>>>> + g_io_channel_set_encoding(conn_channel, NULL,&err);
> >>>>> + if (err != NULL) {
> >>>>> + g_warning("error setting channel encoding to binary");
> >>>>> + g_error_free(err);
> >>>>> + return -1;
> >>>>> + }
> >>>>> + conn_id = g_io_add_watch(conn_channel, G_IO_IN | G_IO_HUP,
> >>>>> + conn_channel_read, s);
> >>>>> + if (err != NULL) {
> >>>>> + g_warning("error adding io watch: %s", err->message);
> >>>>> + g_error_free(err);
> >>>>> + return -1;
> >>>>> + }
> >>>>> + s->conn_channel = conn_channel;
> >>>>> + s->conn_id = conn_id;
> >>>>> + return 0;
> >>>>> +}
> >>>>> +
> >>>>> +static gboolean listen_channel_accept(GIOChannel *channel,
> >>>>> + GIOCondition condition, gpointer data)
> >>>>> +{
> >>>>> + GAState *s = data;
> >>>>> + GError *err = NULL;
> >>>>> + g_assert(channel != NULL);
> >>>>> + int ret;
> >>>>> + bool accepted = false;
> >>>>> +
> >>>>> + s->conn_sock = g_socket_accept(s->listen_sock, NULL,&err);
> >>>>> + if (err != NULL) {
> >>>>> + g_warning("error converting fd to gsocket: %s", err->message);
> >>>>> + g_error_free(err);
> >>>>> + goto out;
> >>>>> + }
> >>>>> + ret = conn_channel_add(s, g_socket_get_fd(s->conn_sock));
> >>>>> + if (ret) {
> >>>>> + g_warning("error setting up connection");
> >>>>> + goto out;
> >>>>> + }
> >>>>> + accepted = true;
> >>>>> +
> >>>>> +out:
> >>>>> + /* only accept 1 connection at a time */
> >>>>> + return !accepted;
> >>>>> +}
> >>>>> +
> >>>>> +/* start polling for readable events on listen fd, new==true
> >>>>> + * indicates we should use the existing s->listen_channel
> >>>>> + */
> >>>>> +static int listen_channel_add(GAState *s, int listen_fd, bool new)
> >>>>> +{
> >>>>> + GError *err = NULL;
> >>>>> + guint listen_id;
> >>>>> +
> >>>>> + if (new) {
> >>>>> + s->listen_channel = g_io_channel_unix_new(listen_fd);
> >>>>> + if (s->listen_sock) {
> >>>>> + g_object_unref(s->listen_sock);
> >>>>> + }
> >>>>> + s->listen_sock = g_socket_new_from_fd(listen_fd,&err);
> >>>>> + if (err != NULL) {
> >>>>> + g_warning("error converting fd to gsocket: %s", err->message);
> >>>>> + g_error_free(err);
> >>>>> + return -1;
> >>>>> + }
> >>>>> + }
> >>>>> + listen_id = g_io_add_watch(s->listen_channel, G_IO_IN,
> >>>>> + listen_channel_accept, s);
> >>>>> + if (err != NULL) {
> >>>>> + g_warning("error adding io watch: %s", err->message);
> >>>>> + g_error_free(err);
> >>>>> + return -1;
> >>>>> + }
> >>>>> + return 0;
> >>>>
> >>>> I'm getting the following error when building this on a F15 guest:
> >>>>
> >>>> qemu-ga.c: In function ‘listen_channel_add’:
> >>>> qemu-ga.c:453:11: error: variable ‘listen_id’ set but not used
> >>>> [-Werror=unused-but-set-variable]
> >>>> cc1: all warnings being treated as errors
> >>>>
> >>>> g_io_add_watch() doesn't seem to return an error. So if the fix is
> >>>> just to
> >>>> drop 'listen_id' and the last if statement altogether I can do it
> >>>> myself,
> >>>> otherwise you can send me only this patch.
> >>>>
> >>>> The series looks good otherwise.
> >>>>
> >>>
> >>> Doh, sorry for not catching this. I did the same thing with conn_id as
> >>> well. I made a patch available here:
> >>>
> >>> http://repo.or.cz/w/qemu/mdroth.git/blobdiff/a8d38e5bb2d558918ac0bad1ee618472ae34fe7a..581922e148f37e8f5844eeb11257eef8e9302709:/qemu-ga.c
> >>>
> >>>
> >>> I tested the patch on a 32-bit F15 guest and it seems to do the trick.
> >>>
> >>> If you'd like you can just pull from
> >>>
> >>> git://repo.or.cz/qemu/mdroth.git qga-dev
> >>>
> >>> Which is this series (set3-v8) plus the patch right now.
> >>
> >> Can you resend the patch to the list please? If it's just this patch
> >> (ie. patch 3/4) that was rebased, then you can submit only it. Otherwise
> >> would be better to submit a new version of the series.
> >>
> >
> > Patch sent. It's just against 3/4
> >
> 
> Or did I misunderstand, and you actually want the revised patch 3/4 with 
> these changes pre-applied? If so let me know and I'll fire that off.

Yes, that would be better.

> 
> >>>
> >>>>> +}
> >>>>> +
> >>>>> +/* cleanup state for closed connection/session, start accepting new
> >>>>> + * connections if we're in listening mode
> >>>>> + */
> >>>>> +static void conn_channel_close(GAState *s)
> >>>>> +{
> >>>>> + if (strcmp(s->method, "unix-listen") == 0) {
> >>>>> + g_io_channel_shutdown(s->conn_channel, true, NULL);
> >>>>> + g_object_unref(s->conn_sock);
> >>>>> + s->conn_sock = NULL;
> >>>>> + listen_channel_add(s, 0, false);
> >>>>> + } else if (strcmp(s->method, "virtio-serial") == 0) {
> >>>>> + /* we spin on EOF for virtio-serial, so back off a bit. also,
> >>>>> + * dont close the connection in this case, it'll resume normal
> >>>>> + * operation when another process connects to host chardev
> >>>>> + */
> >>>>> + usleep(100*1000);
> >>>>> + goto out_noclose;
> >>>>> + }
> >>>>> + g_io_channel_unref(s->conn_channel);
> >>>>> + s->conn_channel = NULL;
> >>>>> + s->conn_id = 0;
> >>>>> +out_noclose:
> >>>>> + return;
> >>>>> +}
> >>>>> +
> >>>>> +static void init_guest_agent(GAState *s)
> >>>>> +{
> >>>>> + struct termios tio;
> >>>>> + int ret, fd;
> >>>>> +
> >>>>> + if (s->method == NULL) {
> >>>>> + /* try virtio-serial as our default */
> >>>>> + s->method = "virtio-serial";
> >>>>> + }
> >>>>> +
> >>>>> + if (s->path == NULL) {
> >>>>> + if (strcmp(s->method, "virtio-serial") != 0) {
> >>>>> + g_critical("must specify a path for this channel");
> >>>>> + exit(EXIT_FAILURE);
> >>>>> + }
> >>>>> + /* try the default path for the virtio-serial port */
> >>>>> + s->path = QGA_VIRTIO_PATH_DEFAULT;
> >>>>> + }
> >>>>> +
> >>>>> + if (strcmp(s->method, "virtio-serial") == 0) {
> >>>>> + s->virtio = true;
> >>>>> + fd = qemu_open(s->path, O_RDWR | O_NONBLOCK | O_ASYNC);
> >>>>> + if (fd == -1) {
> >>>>> + g_critical("error opening channel: %s", strerror(errno));
> >>>>> + exit(EXIT_FAILURE);
> >>>>> + }
> >>>>> + ret = conn_channel_add(s, fd);
> >>>>> + if (ret) {
> >>>>> + g_critical("error adding channel to main loop");
> >>>>> + exit(EXIT_FAILURE);
> >>>>> + }
> >>>>> + } else if (strcmp(s->method, "isa-serial") == 0) {
> >>>>> + fd = qemu_open(s->path, O_RDWR | O_NOCTTY);
> >>>>> + if (fd == -1) {
> >>>>> + g_critical("error opening channel: %s", strerror(errno));
> >>>>> + exit(EXIT_FAILURE);
> >>>>> + }
> >>>>> + tcgetattr(fd,&tio);
> >>>>> + /* set up serial port for non-canonical, dumb byte streaming */
> >>>>> + tio.c_iflag&= ~(IGNBRK | BRKINT | IGNPAR | PARMRK | INPCK | ISTRIP |
> >>>>> + INLCR | IGNCR | ICRNL | IXON | IXOFF | IXANY |
> >>>>> + IMAXBEL);
> >>>>> + tio.c_oflag = 0;
> >>>>> + tio.c_lflag = 0;
> >>>>> + tio.c_cflag |= QGA_BAUDRATE_DEFAULT;
> >>>>> + /* 1 available byte min or reads will block (we'll set non-blocking
> >>>>> + * elsewhere, else we have to deal with read()=0 instead)
> >>>>> + */
> >>>>> + tio.c_cc[VMIN] = 1;
> >>>>> + tio.c_cc[VTIME] = 0;
> >>>>> + /* flush everything waiting for read/xmit, it's garbage at this
> >>>>> point */
> >>>>> + tcflush(fd, TCIFLUSH);
> >>>>> + tcsetattr(fd, TCSANOW,&tio);
> >>>>> + ret = conn_channel_add(s, fd);
> >>>>> + if (ret) {
> >>>>> + g_error("error adding channel to main loop");
> >>>>> + }
> >>>>> + } else if (strcmp(s->method, "unix-listen") == 0) {
> >>>>> + fd = unix_listen(s->path, NULL, strlen(s->path));
> >>>>> + if (fd == -1) {
> >>>>> + g_critical("error opening path: %s", strerror(errno));
> >>>>> + exit(EXIT_FAILURE);
> >>>>> + }
> >>>>> + ret = listen_channel_add(s, fd, true);
> >>>>> + if (ret) {
> >>>>> + g_critical("error binding/listening to specified socket");
> >>>>> + exit(EXIT_FAILURE);
> >>>>> + }
> >>>>> + } else {
> >>>>> + g_critical("unsupported channel method/type: %s", s->method);
> >>>>> + exit(EXIT_FAILURE);
> >>>>> + }
> >>>>> +
> >>>>> + json_message_parser_init(&s->parser, process_event);
> >>>>> + s->main_loop = g_main_loop_new(NULL, false);
> >>>>> +}
> >>>>> +
> >>>>> +int main(int argc, char **argv)
> >>>>> +{
> >>>>> + const char *sopt = "hVvdm:p:l:f:";
> >>>>> + const char *method = NULL, *path = NULL, *pidfile =
> >>>>> QGA_PIDFILE_DEFAULT;
> >>>>> + const struct option lopt[] = {
> >>>>> + { "help", 0, NULL, 'h' },
> >>>>> + { "version", 0, NULL, 'V' },
> >>>>> + { "logfile", 0, NULL, 'l' },
> >>>>> + { "pidfile", 0, NULL, 'f' },
> >>>>> + { "verbose", 0, NULL, 'v' },
> >>>>> + { "method", 0, NULL, 'm' },
> >>>>> + { "path", 0, NULL, 'p' },
> >>>>> + { "daemonize", 0, NULL, 'd' },
> >>>>> + { NULL, 0, NULL, 0 }
> >>>>> + };
> >>>>> + int opt_ind = 0, ch, daemonize = 0;
> >>>>> + GLogLevelFlags log_level = G_LOG_LEVEL_ERROR | G_LOG_LEVEL_CRITICAL;
> >>>>> + FILE *log_file = stderr;
> >>>>> + GAState *s;
> >>>>> +
> >>>>> + while ((ch = getopt_long(argc, argv, sopt, lopt,&opt_ind)) != -1) {
> >>>>> + switch (ch) {
> >>>>> + case 'm':
> >>>>> + method = optarg;
> >>>>> + break;
> >>>>> + case 'p':
> >>>>> + path = optarg;
> >>>>> + break;
> >>>>> + case 'l':
> >>>>> + log_file = fopen(optarg, "a");
> >>>>> + if (!log_file) {
> >>>>> + g_critical("unable to open specified log file: %s",
> >>>>> + strerror(errno));
> >>>>> + return EXIT_FAILURE;
> >>>>> + }
> >>>>> + break;
> >>>>> + case 'f':
> >>>>> + pidfile = optarg;
> >>>>> + break;
> >>>>> + case 'v':
> >>>>> + /* enable all log levels */
> >>>>> + log_level = G_LOG_LEVEL_MASK;
> >>>>> + break;
> >>>>> + case 'V':
> >>>>> + printf("QEMU Guest Agent %s\n", QGA_VERSION);
> >>>>> + return 0;
> >>>>> + case 'd':
> >>>>> + daemonize = 1;
> >>>>> + break;
> >>>>> + case 'h':
> >>>>> + usage(argv[0]);
> >>>>> + return 0;
> >>>>> + case '?':
> >>>>> + g_print("Unknown option, try '%s --help' for more information.\n",
> >>>>> + argv[0]);
> >>>>> + return EXIT_FAILURE;
> >>>>> + }
> >>>>> + }
> >>>>> +
> >>>>> + if (daemonize) {
> >>>>> + g_debug("starting daemon");
> >>>>> + become_daemon(pidfile);
> >>>>> + }
> >>>>> +
> >>>>> + g_type_init();
> >>>>> + g_thread_init(NULL);
> >>>>> +
> >>>>> + s = qemu_mallocz(sizeof(GAState));
> >>>>> + s->conn_id = 0;
> >>>>> + s->conn_channel = NULL;
> >>>>> + s->path = path;
> >>>>> + s->method = method;
> >>>>> + s->log_file = log_file;
> >>>>> + s->log_level = log_level;
> >>>>> + g_log_set_default_handler(ga_log, s);
> >>>>> + g_log_set_fatal_mask(NULL, G_LOG_LEVEL_ERROR);
> >>>>> + s->logging_enabled = true;
> >>>>> + ga_state = s;
> >>>>> +
> >>>>> + module_call_init(MODULE_INIT_QAPI);
> >>>>> + init_guest_agent(ga_state);
> >>>>> + register_signal_handlers();
> >>>>> +
> >>>>> + g_main_loop_run(ga_state->main_loop);
> >>>>> +
> >>>>> + unlink(pidfile);
> >>>>> +
> >>>>> + return 0;
> >>>>> +}
> >>>>> diff --git a/qga/guest-agent-core.h b/qga/guest-agent-core.h
> >>>>> index 688f120..66d1729 100644
> >>>>> --- a/qga/guest-agent-core.h
> >>>>> +++ b/qga/guest-agent-core.h
> >>>>> @@ -15,6 +15,7 @@
> >>>>>
> >>>>> #define QGA_VERSION "1.0"
> >>>>>
> >>>>> +typedef struct GAState GAState;
> >>>>> typedef struct GACommandState GACommandState;
> >>>>>
> >>>>> void ga_command_state_add(GACommandState *cs,
> >>>>> @@ -23,3 +24,6 @@ void ga_command_state_add(GACommandState *cs,
> >>>>> void ga_command_state_init_all(GACommandState *cs);
> >>>>> void ga_command_state_cleanup_all(GACommandState *cs);
> >>>>> GACommandState *ga_command_state_new(void);
> >>>>> +bool ga_logging_enabled(GAState *s);
> >>>>> +void ga_disable_logging(GAState *s);
> >>>>> +void ga_enable_logging(GAState *s);
> >>>>
> >>>
> >>
> >
>