/**
* qemuAgentSend:
* @mon: Monitor
* @msg: Message
* @seconds: number of seconds to wait for the result, it can be either
* -2, -1, 0 or positive.
*
* Send @msg to agent @mon. If @seconds is equal to
* VIR_DOMAIN_QEMU_AGENT_COMMAND_BLOCK(-2), this function will block forever
* waiting for the result. The value of
* VIR_DOMAIN_QEMU_AGENT_COMMAND_DEFAULT(-1) means use default timeout value
* and VIR_DOMAIN_QEMU_AGENT_COMMAND_NOWAIT(0) makes this this function return
* immediately without waiting. Any positive value means the number of seconds
* to wait for the result.
*
* Returns: 0 on success,
* -2 on timeout,
* -1 otherwise
*/
static int qemuAgentSend(qemuAgentPtr mon,
qemuAgentMessagePtr msg,
int seconds)
{
int ret = -1;
unsigned long long then = 0;
/* Check whether qemu quit unexpectedly */
if (mon->lastError.code != VIR_ERR_OK) {
VIR_DEBUG("Attempt to send command while error is set %s",
NULLSTR(mon->lastError.message));
virSetError(&mon->lastError);
return -1;
}
if (seconds > VIR_DOMAIN_QEMU_AGENT_COMMAND_BLOCK) {
unsigned long long now;
if (virTimeMillisNow(&now) < 0)
return -1;
if (seconds == VIR_DOMAIN_QEMU_AGENT_COMMAND_DEFAULT)
seconds = QEMU_AGENT_WAIT_TIME;
then = now + seconds * 1000ull;
}
mon->msg = msg;
qemuAgentUpdateWatch(mon);
while (!mon->msg->finished) {
if ((then && virCondWaitUntil(&mon->notify, &mon->parent.lock, then) < 0) ||
(!then && virCondWait(&mon->notify, &mon->parent.lock) < 0)) {
if (errno == ETIMEDOUT) {
virReportError(VIR_ERR_AGENT_UNRESPONSIVE, "%s",
_("Guest agent not available for now"));
ret = -2;
} else {
virReportSystemError(errno, "%s",
_("Unable to wait on agent monitor "
"condition"));
}
goto cleanup;
}
}
if (mon->lastError.code != VIR_ERR_OK) {
VIR_DEBUG("Send command resulted in error %s",
NULLSTR(mon->lastError.message));
virSetError(&mon->lastError);
goto cleanup;
}
ret = 0;
cleanup:
mon->msg = NULL;
qemuAgentUpdateWatch(mon);
return ret;
}
/**
* qemuAgentSend:
* @mon: Monitor
* @msg: Message
* @timeout: use timeout?
*
* Send @msg to agent @mon.
* Wait max QEMU_AGENT_WAIT_TIME for agent
* to reply.
*
* Returns: 0 on success,
* -2 on timeout,
* -1 otherwise
*/
static int qemuAgentSend(qemuAgentPtr mon,
qemuAgentMessagePtr msg,
bool timeout)
{
int ret = -1;
unsigned long long now, then = 0;
/* Check whether qemu quit unexpectedly */
if (mon->lastError.code != VIR_ERR_OK) {
VIR_DEBUG("Attempt to send command while error is set %s",
NULLSTR(mon->lastError.message));
virSetError(&mon->lastError);
return -1;
}
if (timeout) {
if (virTimeMillisNow(&now) < 0)
return -1;
then = now + QEMU_AGENT_WAIT_TIME;
}
mon->msg = msg;
qemuAgentUpdateWatch(mon);
while (!mon->msg->finished) {
if ((timeout && virCondWaitUntil(&mon->notify, &mon->lock, then) < 0) ||
(!timeout && virCondWait(&mon->notify, &mon->lock) < 0)) {
if (errno == ETIMEDOUT) {
qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Guest agent not available for now"));
ret = -2;
} else {
qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Unable to wait on monitor condition"));
}
goto cleanup;
}
}
if (mon->lastError.code != VIR_ERR_OK) {
VIR_DEBUG("Send command resulted in error %s",
NULLSTR(mon->lastError.message));
virSetError(&mon->lastError);
goto cleanup;
}
ret = 0;
cleanup:
mon->msg = NULL;
qemuAgentUpdateWatch(mon);
return ret;
}
static void
qemuAgentIO(int watch, int fd, int events, void *opaque) {
qemuAgentPtr mon = opaque;
bool error = false;
bool eof = false;
virObjectRef(mon);
/* lock access to the monitor and protect fd */
qemuAgentLock(mon);
#if DEBUG_IO
VIR_DEBUG("Agent %p I/O on watch %d fd %d events %d", mon, watch, fd, events);
#endif
if (mon->fd != fd || mon->watch != watch) {
if (events & (VIR_EVENT_HANDLE_HANGUP | VIR_EVENT_HANDLE_ERROR))
eof = true;
virReportError(VIR_ERR_INTERNAL_ERROR,
_("event from unexpected fd %d!=%d / watch %d!=%d"),
mon->fd, fd, mon->watch, watch);
error = true;
} else if (mon->lastError.code != VIR_ERR_OK) {
if (events & (VIR_EVENT_HANDLE_HANGUP | VIR_EVENT_HANDLE_ERROR))
eof = true;
error = true;
} else {
if (events & VIR_EVENT_HANDLE_WRITABLE) {
if (mon->connectPending) {
if (qemuAgentIOConnect(mon) < 0)
error = true;
} else {
if (qemuAgentIOWrite(mon) < 0)
error = true;
}
events &= ~VIR_EVENT_HANDLE_WRITABLE;
}
if (!error &&
events & VIR_EVENT_HANDLE_READABLE) {
int got = qemuAgentIORead(mon);
events &= ~VIR_EVENT_HANDLE_READABLE;
if (got < 0) {
error = true;
} else if (got == 0) {
eof = true;
} else {
/* Ignore hangup/error events if we read some data, to
* give time for that data to be consumed */
events = 0;
if (qemuAgentIOProcess(mon) < 0)
error = true;
}
}
if (!error &&
events & VIR_EVENT_HANDLE_HANGUP) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("End of file from monitor"));
eof = 1;
events &= ~VIR_EVENT_HANDLE_HANGUP;
}
if (!error && !eof &&
events & VIR_EVENT_HANDLE_ERROR) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Invalid file descriptor while waiting for monitor"));
eof = 1;
events &= ~VIR_EVENT_HANDLE_ERROR;
}
if (!error && events) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unhandled event %d for monitor fd %d"),
events, mon->fd);
error = 1;
}
}
if (error || eof) {
if (mon->lastError.code != VIR_ERR_OK) {
/* Already have an error, so clear any new error */
virResetLastError();
} else {
virErrorPtr err = virGetLastError();
if (!err)
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
_("Error while processing monitor IO"));
virCopyLastError(&mon->lastError);
virResetLastError();
}
VIR_DEBUG("Error on monitor %s", NULLSTR(mon->lastError.message));
/* If IO process resulted in an error & we have a message,
* then wakeup that waiter */
if (mon->msg && !mon->msg->finished) {
mon->msg->finished = 1;
virCondSignal(&mon->notify);
}
}
qemuAgentUpdateWatch(mon);
/* We have to unlock to avoid deadlock against command thread,
* but is this safe ? I think it is, because the callback
* will try to acquire the virDomainObjPtr mutex next */
if (eof) {
void (*eofNotify)(qemuAgentPtr, virDomainObjPtr)
= mon->cb->eofNotify;
virDomainObjPtr vm = mon->vm;
/* Make sure anyone waiting wakes up now */
virCondSignal(&mon->notify);
qemuAgentUnlock(mon);
virObjectUnref(mon);
VIR_DEBUG("Triggering EOF callback");
(eofNotify)(mon, vm);
} else if (error) {
void (*errorNotify)(qemuAgentPtr, virDomainObjPtr)
= mon->cb->errorNotify;
virDomainObjPtr vm = mon->vm;
/* Make sure anyone waiting wakes up now */
virCondSignal(&mon->notify);
qemuAgentUnlock(mon);
virObjectUnref(mon);
VIR_DEBUG("Triggering error callback");
(errorNotify)(mon, vm);
} else {
qemuAgentUnlock(mon);
virObjectUnref(mon);
}
}
