104 lines
4.3 KiB
Plaintext
104 lines
4.3 KiB
Plaintext
/***********************************************************************
|
|
*
|
|
* Copyright (C) 2006 Novell, Inc. All Rights Reserved.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; version 2.1
|
|
* of the License.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, Novell, Inc.
|
|
*
|
|
* To contact Novell about this file by physical or electronic mail,
|
|
* you may find current contact information at www.novell.com.
|
|
*
|
|
* Author: Juan Carlos Luciani <jluciani@novell.com>
|
|
*
|
|
***********************************************************************/
|
|
/***********************************************************************
|
|
*
|
|
* README for IpcLibs
|
|
*
|
|
***********************************************************************/
|
|
|
|
INTRODUCTION
|
|
|
|
IpcLibs provides an IPC infrastructure that can be linked into client and server
|
|
applications.
|
|
|
|
IpcLibs provides IPC communications over TCP or DOMAIN sockets. It does this in a scalable
|
|
and un-serialized manner. The infrastructure can make use of multiple communication channels
|
|
between a client and a server and is capabled of concurrently serving multiple requests over
|
|
the different channels.
|
|
|
|
The IpcLib APIs are very simple to utilize and support multi-threaded applications.
|
|
|
|
SERVER APPLICATION PROGRAMMING NOTES
|
|
|
|
The IPC API for server applications is defined in casa_s_ipc.h. This API is provided by
|
|
libcasa_s_ipc.so.
|
|
|
|
To utilize the IPC server services, an application must first initialize the infrastructure by
|
|
calling IpcServerInit() which is then followed by the desired IpcServerSetXXAddress() call.
|
|
|
|
After the Ipc server is initialized and the server address is set, then the application calls
|
|
IpcServerStart() to start the engine (This causes the engine to start to accept connections and
|
|
receive requests from clients).
|
|
|
|
To start servicing requests, the application executesIpcServerGetRequest(); this calls blocks until
|
|
a request is ready to be serviced at which time it returns with an ID which is associated with the
|
|
request that needs to be serviced. The returned ID is then used by the application to retrieve the
|
|
request data via the IpcServerGetRequestData(), once the application processes the request, it
|
|
completes it by executing IpcServerCompleteRequest() with the ID and any data that it may want to
|
|
send back to the client.
|
|
|
|
Note that a server application can call IpcServerGetRequest() from multiple threads to make itself
|
|
more scalable.
|
|
|
|
For an example server application that utilizes the IPC API for servers, see file
|
|
linux/server/test/testServer.c.
|
|
|
|
CLIENT APPLICATION PROGRAMMING NOTES
|
|
|
|
The IPC API for client applications is defined in casa_c_ipc.h. This API is provided by
|
|
libcasa_c_ipc.so.
|
|
|
|
To utilize the IPC client services, an application must first initialize the infrastructure by
|
|
calling IpcClientInit(). Once the IPC client is initialized, then the application needs to open
|
|
endpoints for the servers that it wishes to submit requests. Endpoints are opened by calling the
|
|
appropriate IpcClientOpenXXRemoteEndPoint() with information about the server listen address.
|
|
|
|
IpcClientOpenXXRemoteEndpoint() calls return a handles that are associated with the opened
|
|
endpoints. This endpoint handles are then utilized by the application to specify the target of
|
|
IPC requests.
|
|
|
|
To submit a request to a particular endpoint, the application executes IpcClientSubmitReq() with
|
|
the endpoint handle and the request data. Calls to IpcClientSubmitReq() block until the requests
|
|
is processed by the server at which time it returns the reply data.
|
|
|
|
For an example client application that utilizes the IPC API for clients, see file
|
|
linux/client/test/testClient.c.
|
|
|
|
SECURITY CONSIDERATIONS
|
|
|
|
IpcLibs does not provide any security features beyond what is provided by the protocol stacks for
|
|
tcp/ip and Domain sockets communications.
|
|
|
|
By leveraging the File System Access Control features, you can scope communications that occur over
|
|
Domain sockets to specific or groups of users.
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|