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41 lines
2.1 KiB
ReStructuredText
41 lines
2.1 KiB
ReStructuredText
==========================
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XPCOM Standalone Library
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==========================
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What it is for
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--------------
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The XPCOM standalone library, libxpcomrt, was created to support building the WebRTC
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standalone library. The libxpcomrt library contains only the parts of XPCOM that are required
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to run WebRTC; parts such as the cycle collector and the startup cache required only by Gecko
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are not included. A library containing a small subset of Necko was also
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created to support the WebRTC standalone library.
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The libxcomrt library was created specifically to support the WebRTC standalone library.
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It is not intended to be used as a general purpose library to add XPCOM functionality to
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an application. It is likely that some of the code contained in the libxpcomrt library
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has unresolved symbols that may be exposed if used for purposes other than being linked
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into the WebRTC standalone library.
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How to use it
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-------------
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When compiling code utilizing libxpcomrt, both ``MOZILLA_INTERNAL_API`` and ``MOZILLA_XPCOMRT_API``
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must be defined in addition to whatever standard flags are used to compile Gecko.
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The library is initialized with ``NS_InitXPCOMRT()`` and shutdown with ``NS_ShutdownXPCOMRT()``.
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Both functions are declared in xpcom/libxpcomrt/XPCOMRTInit.h.
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Only a small number of services which are required for the WebRTC
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standalone library to function are included with libxpcomrt. The dynamic loading of services is not
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supported. Including a service through ``NSMODULE_DEFN`` and static linking is also not supported.
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The only way to add a service to libxpcomrt is to explicitly start the service during
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``nsComponentManagerImpl::Init`` in xpcom/components/nsComponentManager.cpp.
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The best method to determine what parts of XPCOM are included in libxpcomrt is to examine the
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xpcom/libxpcomrt/moz.build file. It contains all of the XPCOM source files used to build libxpcomrt.
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A few of the services that are included are:
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* UUID Generator
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* DNS Service
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* Socket Transport Service
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* IDN Service
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All dependencies on ipc/chromium have been removed.
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IO and preference services are not included making this library of limited utility.
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