Adding upstream version 7.0.6-dfsg.upstream/7.0.6-dfsgupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 326 insertions, 0 deletions

diff --git a/src/libs/xpcom18a4/ipc/ipcd/client/public/ipcdclient.h b/src/libs/xpcom18a4/ipc/ipcd/client/public/ipcdclient.h
new file mode 100644
index 00000000..5cbed879
--- /dev/null
+++ b/src/libs/xpcom18a4/ipc/ipcd/client/public/ipcdclient.h
@@ -0,0 +1,326 @@
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla IPC.
+ *
+ * The Initial Developer of the Original Code is IBM Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 2004
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Darin Fisher <darin@meer.net>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef ipcdclient_h__
+#define ipcdclient_h__
+
+/*****************************************************************************
+ * This file provides a client-side API to the IPC daemon.
+ *
+ * This API can be used to communicate with other clients of the IPC daemon
+ * as well as modules running inside the IPC daemon.
+ *
+ * This API is meant to be used only on the application's main thread.  It is
+ * assumed that callbacks can be dispatched via the main thread's event queue.
+ */
+
+#include "nscore.h"
+#include "nsID.h"
+#include "nsError.h"
+#include "ipcIMessageObserver.h"
+#include "ipcIClientObserver.h"
+
+/* This API is only provided for the extensions compiled into the IPCDC
+ * library, hence this API is hidden in the final DSO. */
+#define IPC_METHOD NS_HIDDEN_(nsresult)
+
+/* This value can be used to represent the client id of any client connected
+ * to the IPC daemon. */
+#define IPC_SENDER_ANY PR_UINT32_MAX
+
+/* This error code can only be returned by OnMessageAvailable, when called by
+ * IPC_WaitMessage.  See IPC_WaitMessage for a description of how this error
+ * code may be used. */
+#define IPC_WAIT_NEXT_MESSAGE \
+  NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GENERAL, 10)
+
+#ifdef VBOX
+/* This error code can only be returned by the selector functions called by
+ * WaitTarget. The message should be dropped without processing. */
+#define IPC_DISCARD_MESSAGE \
+  NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_GENERAL, 12)
+#endif /* VBOX */
+
+/* This error code is returned by IPC_WaitMessage under certain conditions. */
+#define IPC_ERROR_WOULD_BLOCK NS_BASE_STREAM_WOULD_BLOCK
+
+/*****************************************************************************
+ * Initialization and Shutdown
+ */
+
+// XXX limit these to the main thread, and call them from our module's ctor/dtor?
+
+/**
+ * Connects this process to the IPC daemon and initializes it for use as a
+ * client of the IPC daemon.  This function must be called once before any
+ * other methods defined in this file can be used.
+ *
+ * @returns NS_ERROR_ALREADY_INITIALIZED if IPC_Shutdown was not called since
+ * the last time IPC_Init was called.
+ */
+IPC_METHOD IPC_Init();
+
+/**
+ * Disconnects this process from the IPC daemon.  After this function is
+ * called, no other methods in this file except for IPC_Init may be called.
+ *
+ * This function calls all client observers (registered with
+ * IPC_AddClientObserver) before it actually disconnects from the IPC daemon,
+ * with aClientID parameter of the OnClientStateChange callback specially
+ * set to IPC_SENDER_ANY and aClientState set to CLIENT_DOWN. This gives
+ * the interested party an opportunity to perform a proper shutdown procedure.
+ * All IPC methods are still available inside OnClientStateChange call except
+ * the IPC_WaitMessage function, that will immediately fail with an error.
+ * OnClientStateChange is called on the same thread where this function is
+ * called.
+ *
+ * @returns NS_ERROR_NOT_INITIALIZED if IPC_Init has not been called or if
+ * IPC_Init did not return a success code.
+ */
+IPC_METHOD IPC_Shutdown();
+
+
+/*****************************************************************************
+ * The core messaging API
+ */
+
+/**
+ * Call this method to define a message target.  A message target is defined
+ * by a UUID and a message observer.  This observer is notified asynchronously
+ * whenever a message is sent to this target in this process.
+ *
+ * This function has three main effects:
+ *  o  If the message target is already defined, then this function simply
+ *     resets its message observer.
+ *  o  If the message target is not already defined, then the message target
+ *     is defined and the IPC daemon is notified of the existance of this
+ *     message target.
+ *  o  If null is passed for the message observer, then the message target is
+ *     removed, and the daemon is notified of the removal of this message target.
+ *
+ * If aOnCurrentThread is true, then notifications to the observer will occur
+ * on the current thread.  This means that there must be a nsIEventTarget
+ * associated with the calling thread.  If aOnCurrentThread is false, then
+ * notifications to the observer will occur on a background thread.  In which
+ * case, the observer must be threadsafe.
+ */
+IPC_METHOD IPC_DefineTarget(
+  const nsID          &aTarget,
+  ipcIMessageObserver *aObserver,
+  PRBool               aOnCurrentThread = PR_TRUE
+);
+
+/**
+ * Call this method to temporarily disable the message observer configured
+ * for a message target.
+ */
+IPC_METHOD IPC_DisableMessageObserver(
+  const nsID          &aTarget
+);
+
+/**
+ * Call this method to re-enable the message observer configured for a
+ * message target.
+ */
+IPC_METHOD IPC_EnableMessageObserver(
+  const nsID          &aTarget
+);
+
+/**
+ * This function sends a message to the IPC daemon asynchronously.  If
+ * aReceiverID is non-zero, then the message is forwarded to the client
+ * corresponding to that identifier.
+ *
+ * If there is no client corresponding to aRecieverID, then the IPC daemon will
+ * simply drop the message.
+ */
+IPC_METHOD IPC_SendMessage(
+  PRUint32             aReceiverID,
+  const nsID          &aTarget,
+  const PRUint8       *aData,
+  PRUint32             aDataLen
+);
+
+/**
+ * This function blocks the calling thread until a message for the given target
+ * is received (optionally from the specified client).
+ *
+ * The aSenderID parameter is interpreted as follows:
+ *  o  If aSenderID is 0, then this function waits for a message to be sent by
+ *     the IPC daemon.
+ *  o  If aSenderID is IPC_SENDER_ANY, then this function waits for a message
+ *     to be sent from any source.
+ *  o  Otherwise, this function waits for a message to be sent by the client
+ *     with ID given by aSenderID.  If aSenderID does not identify a valid
+ *     client, or if the client dies while waiting, then this function will
+ *     return an error.
+ *
+ * The aObserver parameter is interpreted as follows:
+ *  o  If aObserver is null, then the default message observer for the target
+ *     is invoked when the next message is received.
+ *  o  Otherwise, aObserver will be inovked when the next message is received.
+ *
+ * The aConsumer parameter is interpreted as follows:
+ *  o  If aObserver is null or aConsumer is null, this parameter is ignored.
+ *  o  Otherwise, aConsumer will be invoked right after (and only if) aObserver
+ *     has accepted some message. It will receive exactly the same message
+ *     that was accepted by aObserver.
+ *
+ * The aTimeout parameter is interpreted as follows:
+ *  o  If aTimeout is PR_INTERVAL_NO_TIMEOUT, then this function will block
+ *     until a matching message is received.
+ *  o  If aTimeout is PR_INTERVAL_NO_WAIT, then this function will only inspect
+ *     the current queue of messages.  If no matching message is found, then
+ *     IPC_ERROR_WOULD_BLOCK is returned.
+ *  o  Otherwise, aTimeout specifies the maximum amount of time to wait for a
+ *     matching message to be received.  If no matching message is found after
+ *     the timeout expires, then IPC_ERROR_WOULD_BLOCK is returned.
+ *
+ * If aObserver's OnMessageAvailable function returns IPC_WAIT_NEXT_MESSAGE,
+ * then the function will continue blocking until the next matching message
+ * is received.  Bypassed messages will be dispatched to the default message
+ * observer when the event queue, associated with the thread that called
+ * IPC_DefineTarget, is processed.
+ *
+ * There is a special case if aSenderID is IPC_SENDER_ANY and one of IPC clients
+ * dies while this function waits for a message. In this case, aObserver's
+ * OnMessageAvailable function is called with a special set of arguments:
+ * dead client id, empty target id and null message (both data and data length
+ * are zeroes). If it returns IPC_WAIT_NEXT_MESSAGE, IPC_WaitMessage continues
+ * blocking as usual, otherwise an error is immediately returned to the caller.
+ *
+ * aObserver is not expected to use any IPC system functons from within its
+ * OnMessageAvailable implementation. This is because the IPC system is not
+ * re-entrant during invocation of OnMessageAvailable function, and making other
+ * IPC calls can lead to unexpected results (like message losses or traps). On
+ * the contrary, aConsumer's OnMessageAvailable function is allowed to use the
+ * IPC system without any limitations.
+ *
+ * This function runs the risk of hanging the calling thread indefinitely if
+ * no matching message is ever received.
+ */
+IPC_METHOD IPC_WaitMessage(
+  PRUint32             aSenderID,
+  const nsID          &aTarget,
+  ipcIMessageObserver *aObserver = nsnull,
+  ipcIMessageObserver *aConsumer = nsnull,
+  PRIntervalTime       aTimeout = PR_INTERVAL_NO_TIMEOUT
+);
+
+/*****************************************************************************/
+
+/**
+ * Returns the "ClientID" of the current process.
+ */
+IPC_METHOD IPC_GetID(
+  PRUint32 *aClientID
+);
+
+/**
+ * Adds a new name for the current process.  The IPC daemon is notified of this
+ * change, which allows other processes to discover this process by the given
+ * name.
+ */
+IPC_METHOD IPC_AddName(
+  const char *aName
+);
+
+/**
+ * Removes a name associated with the current process.
+ */
+IPC_METHOD IPC_RemoveName(
+  const char *aName
+);
+
+/**
+ * Adds client observer.  Will be called on the main thread.
+ */
+IPC_METHOD IPC_AddClientObserver(
+  ipcIClientObserver *aObserver
+);
+
+/**
+ * Removes client observer.
+ */
+IPC_METHOD IPC_RemoveClientObserver(
+  ipcIClientObserver *aObserver
+);
+
+/**
+ * Resolves the given client name to a client ID of a process connected to
+ * the IPC daemon.
+ */
+IPC_METHOD IPC_ResolveClientName(
+  const char *aName,
+  PRUint32   *aClientID
+);
+
+/**
+ * Tests whether the client is connected to the IPC daemon.
+ */
+IPC_METHOD IPC_ClientExists(
+  PRUint32  aClientID,
+  PRBool   *aResult
+);
+
+/*****************************************************************************/
+
+/**
+ * This class can be used to temporarily disable the default message observer
+ * defined for a particular message target.
+ */
+class ipcDisableMessageObserverForScope
+{
+public:
+  ipcDisableMessageObserverForScope(const nsID &aTarget)
+    : mTarget(aTarget)
+  {
+    IPC_DisableMessageObserver(mTarget);
+  }
+
+  ~ipcDisableMessageObserverForScope()
+  {
+    IPC_EnableMessageObserver(mTarget);
+  }
+
+private:
+  const nsID &mTarget;
+};
+
+#define IPC_DISABLE_MESSAGE_OBSERVER_FOR_SCOPE(_t) \
+  ipcDisableMessageObserverForScope ipc_dmo_for_scope##_t(_t)
+
+#endif /* ipcdclient_h__ */