Aleksandr Anenkov alex-anenkov

## SCM_RIGHTS.md

      
        
          
            
              
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                kentonv
                / SCM_RIGHTS.md
            
            
              Last active
              November 4, 2023 17:10
            
              
                SCM_RIGHTS API quirks
              
          
        
      
        
  
      
    As tested on Linux:

An SCM_RIGHTS ancillary message is "attached" to the
range of data bytes sent in the same sendmsg() call.
However, as always, recvmsg() calls on the receiving
end don't necessarily map 1:1 to sendmsg() calls.
Messages can be coalesced or split.
The recvmsg() call that receives the first byte
of the ancillary message's byte range also receives
the ancillary message itself.
To prevent multiple ancillary messages being delivered