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Viewing changes to src/ubuntu/hybris/bridge.h

  • Committer: Andreas Pokorny
  • Date: 2014-02-17 22:41:29 UTC
  • mfrom: (190.1.2 platform-api)
  • Revision ID: andreas.pokorny@canonical.com-20140217224129-086bn5nh3rv84y3r
[ Martin Pitt ]
Fix crash in ua_sensors_*_new() if there is no available backend.
Return NULL instead. (LP: #1272294)

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src/ubuntu/hybris/bridge.h
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/**********************************************************/
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#define DLSYM(fptr, sym) if (*(fptr) == NULL) { *((void**)fptr) = (void *) internal::Bridge<>::instance().resolve_symbol(sym); }
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// this allows DLSYM to return NULL (happens if the backend is not available),
 
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// and returns NULL in that case; return_type must be a pointer!
 
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#define IMPLEMENT_CTOR0(return_type, symbol)  \
 
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    return_type symbol()                          \
 
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    {                                             \
 
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        static return_type (*f)() = NULL;         \
 
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        DLSYM(&f, #symbol);                       \
 
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        return f ? f() : NULL;}
 
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#define IMPLEMENT_FUNCTION0(return_type, symbol)  \
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    return_type symbol()                          \
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    {                                             \
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        static void (*f)() = NULL;                \
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        DLSYM(&f, #symbol);                       \
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        f();}
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#define IMPLEMENT_FUNCTION1(return_type, symbol, arg1) \
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    return_type symbol(arg1 _1)                        \
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    {                                                  \