[xorg-bugzilla-noise] [Bug 1402] New: Xnest crashes if SHM is compiled in but not available

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https://freedesktop.org/bugzilla/show_bug.cgi?id=1402        
   
           Summary: Xnest crashes if SHM is compiled in but not available
           Product: xorg
           Version: unspecified
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Server/general
        AssignedTo: xorg-bugzilla-noise at freedesktop.org
        ReportedBy: ago at freedesktop.org


the bigfont extension tests for available shm and skips the allocation of the
FontPrivate index if it is not available. Later the index is used regardless if
it was allocated. 

The patch wraps all parts which use shm or the FontPrivate with a test for
badSysCall (which indicates that shm is not available)        
   
   
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