Now we don't need to differentiate error and eof cases in the loop function.
So let's simplify it radically using goto instead of flags.
---
src/qemu/qemu_agent.c | 185 ++++++++++++++++++-------------------------
src/qemu/qemu_agent.h | 2 -
src/qemu/qemu_process.c | 22 +----
tests/qemumonitortestutils.c | 1 -
4 files changed, 83 insertions(+), 127 deletions(-)
diff --git a/src/qemu/qemu_agent.c b/src/qemu/qemu_agent.c
index ec8d47e..43d78c9 100644
--- a/src/qemu/qemu_agent.c
+++ b/src/qemu/qemu_agent.c
@@ -595,8 +595,8 @@ static void
qemuAgentIO(int watch, int fd, int events, void *opaque)
{
qemuAgentPtr mon = opaque;
- bool error = false;
- bool eof = false;
+ void (*errorNotify)(qemuAgentPtr, virDomainObjPtr);
+ virDomainObjPtr vm;
virObjectRef(mon);
/* lock access to the monitor and protect fd */
@@ -606,122 +606,95 @@ qemuAgentIO(int watch, int fd, int events, void *opaque)
#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 agent monitor"));
- eof = true;
- 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 = true;
- events &= ~VIR_EVENT_HANDLE_ERROR;
- }
- if (!error && events) {
- virReportError(VIR_ERR_INTERNAL_ERROR,
- _("Unhandled event %d for monitor fd %d"),
- events, mon->fd);
- error = true;
- }
+ goto error;
}
- if (error || eof) {
- if (mon->lastError.code != VIR_ERR_OK) {
- /* Already have an error, so clear any new error */
- virResetLastError();
+ if (mon->lastError.code != VIR_ERR_OK)
+ goto error;
+
+ if (events & VIR_EVENT_HANDLE_WRITABLE) {
+ if (mon->connectPending) {
+ if (qemuAgentIOConnect(mon) < 0)
+ goto error;
} else {
- virErrorPtr err = virGetLastError();
- if (!err)
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
- _("Error while processing monitor IO"));
- virCopyLastError(&mon->lastError);
- virResetLastError();
+ if (qemuAgentIOWrite(mon) < 0)
+ goto error;
}
+ events &= ~VIR_EVENT_HANDLE_WRITABLE;
+ }
- 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);
- }
+ if (events & VIR_EVENT_HANDLE_READABLE) {
+ int got = qemuAgentIORead(mon);
+
+ if (got <= 0)
+ goto error;
+
+ if (qemuAgentIOProcess(mon) < 0)
+ goto error;
+
+ /* Ignore hangup/error events if we read some data, to
+ * give time for that data to be consumed */
+ events = 0;
+ }
+
+ if (events & VIR_EVENT_HANDLE_HANGUP) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("End of file from agent monitor"));
+ goto error;
+ }
+
+ if (events & VIR_EVENT_HANDLE_ERROR) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Invalid file descriptor while waiting for monitor"));
+ goto error;
+ }
+
+ if (events) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Unhandled event %d for monitor fd %d"),
+ events, mon->fd);
+ goto error;
}
qemuAgentUpdateWatch(mon);
+ virObjectUnlock(mon);
+ virObjectUnref(mon);
+ return;
- /* 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);
- virObjectUnlock(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);
- virObjectUnlock(mon);
- virObjectUnref(mon);
- VIR_DEBUG("Triggering error callback");
- (errorNotify)(mon, vm);
+ error:
+ if (mon->lastError.code != VIR_ERR_OK) {
+ /* Already have an error, so clear any new error */
+ virResetLastError();
} else {
- virObjectUnlock(mon);
- virObjectUnref(mon);
+ 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);
+
+ errorNotify = mon->cb->errorNotify;
+ vm = mon->vm;
+
+ /* Make sure anyone waiting wakes up now */
+ virCondSignal(&mon->notify);
+ virObjectUnlock(mon);
+ virObjectUnref(mon);
+ (errorNotify)(mon, vm);
}
@@ -732,9 +705,9 @@ qemuAgentOpen(virDomainObjPtr vm,
{
qemuAgentPtr mon;
- if (!cb || !cb->eofNotify) {
+ if (!cb || !cb->errorNotify) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
- _("EOF notify callback must be supplied"));
+ _("error notify callback must be supplied"));
return NULL;
}
diff --git a/src/qemu/qemu_agent.h b/src/qemu/qemu_agent.h
index 6dd9c70..76e8772 100644
--- a/src/qemu/qemu_agent.h
+++ b/src/qemu/qemu_agent.h
@@ -36,8 +36,6 @@ typedef qemuAgentCallbacks *qemuAgentCallbacksPtr;
struct _qemuAgentCallbacks {
void (*destroy)(qemuAgentPtr mon,
virDomainObjPtr vm);
- void (*eofNotify)(qemuAgentPtr mon,
- virDomainObjPtr vm);
void (*errorNotify)(qemuAgentPtr mon,
virDomainObjPtr vm);
};
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index 3da1bd5..fe7682e 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -128,12 +128,12 @@ extern virQEMUDriverPtr qemu_driver;
* performed
*/
static void
-qemuProcessHandleAgentEOF(qemuAgentPtr agent,
- virDomainObjPtr vm)
+qemuProcessHandleAgentError(qemuAgentPtr agent,
+ virDomainObjPtr vm)
{
qemuDomainObjPrivatePtr priv;
- VIR_DEBUG("Received EOF from agent on %p '%s'", vm, vm->def->name);
+ VIR_DEBUG("Received error from agent on %p '%s'", vm, vm->def->name);
virObjectLock(vm);
@@ -145,7 +145,7 @@ qemuProcessHandleAgentEOF(qemuAgentPtr agent,
}
if (priv->beingDestroyed) {
- VIR_DEBUG("Domain is being destroyed, agent EOF is expected");
+ VIR_DEBUG("Domain is being destroyed, agent error is expected");
goto unlock;
}
@@ -161,19 +161,6 @@ qemuProcessHandleAgentEOF(qemuAgentPtr agent,
}
-/*
- * This is invoked when there is some kind of error
- * parsing data to/from the agent. The VM can continue
- * to run, but no further agent commands will be
- * allowed
- */
-static void
-qemuProcessHandleAgentError(qemuAgentPtr agent,
- virDomainObjPtr vm)
-{
- qemuProcessHandleAgentEOF(agent, vm);
-}
-
static void qemuProcessHandleAgentDestroy(qemuAgentPtr agent,
virDomainObjPtr vm)
{
@@ -185,7 +172,6 @@ static void qemuProcessHandleAgentDestroy(qemuAgentPtr agent,
static qemuAgentCallbacks agentCallbacks = {
.destroy = qemuProcessHandleAgentDestroy,
- .eofNotify = qemuProcessHandleAgentEOF,
.errorNotify = qemuProcessHandleAgentError,
};
diff --git a/tests/qemumonitortestutils.c b/tests/qemumonitortestutils.c
index c86a27a..d9b2726 100644
--- a/tests/qemumonitortestutils.c
+++ b/tests/qemumonitortestutils.c
@@ -752,7 +752,6 @@ qemuMonitorTestAgentNotify(qemuAgentPtr agent ATTRIBUTE_UNUSED,
static qemuAgentCallbacks qemuMonitorTestAgentCallbacks = {
- .eofNotify = qemuMonitorTestAgentNotify,
.errorNotify = qemuMonitorTestAgentNotify,
};
--
1.8.3.1
--
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