From: ldo@nz.invalid   
      
   On Sat, 3 Jan 2026 21:31:20 -0500, James Kuyper wrote:   
      
   > On 2026-01-03 21:19, Lawrence D’Oliveiro wrote:   
   >>   
   >> What if the entire machine address space is valid? Are C pointer   
   >> types supposed to add an extra “invalid” value on top of that?   
   >   
   > Either that, or set aside one piece of addressable memory that is   
   > not available to user code. Note, in particular, that it might be a   
   > piece of memory used by the implementation of C, or by the operating   
   > system. In which case, the undefined behavior that can occur as a   
   > result of dereferencing a null point would take the form of messing   
   > up the C runtime or the operating system.   
      
   “Undefined behaviour” could also include “performing a valid memory   
   access”, could it not.   
      
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    * Origin: you cannot sedate... all the things you hate (1:229/2)