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package hcs
import (
"sync"
"syscall"
"github.com/Microsoft/hcsshim/internal/interop"
"github.com/sirupsen/logrus"
)
var (
nextCallback uintptr
callbackMap = map[uintptr]*notifcationWatcherContext{}
callbackMapLock = sync.RWMutex{}
notificationWatcherCallback = syscall.NewCallback(notificationWatcher)
// Notifications for HCS_SYSTEM handles
hcsNotificationSystemExited hcsNotification = 0x00000001
hcsNotificationSystemCreateCompleted hcsNotification = 0x00000002
hcsNotificationSystemStartCompleted hcsNotification = 0x00000003
hcsNotificationSystemPauseCompleted hcsNotification = 0x00000004
hcsNotificationSystemResumeCompleted hcsNotification = 0x00000005
hcsNotificationSystemCrashReport hcsNotification = 0x00000006
hcsNotificationSystemSiloJobCreated hcsNotification = 0x00000007
hcsNotificationSystemSaveCompleted hcsNotification = 0x00000008
hcsNotificationSystemRdpEnhancedModeStateChanged hcsNotification = 0x00000009
hcsNotificationSystemShutdownFailed hcsNotification = 0x0000000A
hcsNotificationSystemGetPropertiesCompleted hcsNotification = 0x0000000B
hcsNotificationSystemModifyCompleted hcsNotification = 0x0000000C
hcsNotificationSystemCrashInitiated hcsNotification = 0x0000000D
hcsNotificationSystemGuestConnectionClosed hcsNotification = 0x0000000E
// Notifications for HCS_PROCESS handles
hcsNotificationProcessExited hcsNotification = 0x00010000
// Common notifications
hcsNotificationInvalid hcsNotification = 0x00000000
hcsNotificationServiceDisconnect hcsNotification = 0x01000000
)
type hcsNotification uint32
type notificationChannel chan error
type notifcationWatcherContext struct {
channels notificationChannels
handle hcsCallback
}
type notificationChannels map[hcsNotification]notificationChannel
func newChannels() notificationChannels {
channels := make(notificationChannels)
channels[hcsNotificationSystemExited] = make(notificationChannel, 1)
channels[hcsNotificationSystemCreateCompleted] = make(notificationChannel, 1)
channels[hcsNotificationSystemStartCompleted] = make(notificationChannel, 1)
channels[hcsNotificationSystemPauseCompleted] = make(notificationChannel, 1)
channels[hcsNotificationSystemResumeCompleted] = make(notificationChannel, 1)
channels[hcsNotificationProcessExited] = make(notificationChannel, 1)
channels[hcsNotificationServiceDisconnect] = make(notificationChannel, 1)
channels[hcsNotificationSystemCrashReport] = make(notificationChannel, 1)
channels[hcsNotificationSystemSiloJobCreated] = make(notificationChannel, 1)
channels[hcsNotificationSystemSaveCompleted] = make(notificationChannel, 1)
channels[hcsNotificationSystemRdpEnhancedModeStateChanged] = make(notificationChannel, 1)
channels[hcsNotificationSystemShutdownFailed] = make(notificationChannel, 1)
channels[hcsNotificationSystemGetPropertiesCompleted] = make(notificationChannel, 1)
channels[hcsNotificationSystemModifyCompleted] = make(notificationChannel, 1)
channels[hcsNotificationSystemCrashInitiated] = make(notificationChannel, 1)
channels[hcsNotificationSystemGuestConnectionClosed] = make(notificationChannel, 1)
return channels
}
func closeChannels(channels notificationChannels) {
for _, c := range channels {
close(c)
}
}
func notificationWatcher(notificationType hcsNotification, callbackNumber uintptr, notificationStatus uintptr, notificationData *uint16) uintptr {
var result error
if int32(notificationStatus) < 0 {
result = interop.Win32FromHresult(notificationStatus)
}
callbackMapLock.RLock()
context := callbackMap[callbackNumber]
callbackMapLock.RUnlock()
if context == nil {
return 0
}
if channel, ok := context.channels[notificationType]; ok {
channel <- result
} else {
logrus.WithFields(logrus.Fields{
"notification-type": notificationType,
}).Warn("Received a callback of an unsupported type")
}
return 0
}
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