🚀 go-pugleaf

I find the interaction between exit and atexit confusing.
atexit registers a function to be called at normal program termination.
Normal program termination is equivalent to a call of exit.
I would like to have access to the parameter with which exit is called.
Ideally, I would like to have write access to it. i.e. I would like
atexit to be respecified as int atexit ( void ( * func ) ( int * ) ).

There is prior art in an undocumented feature of the VAX/VMS C 3.*
compilers.  The ability to react to a termination condition passed as a
parameter seems better than using shared data.  I don't envisage any
circumstances in which I would want to modify the condition but like the
concept of being able to do so.

I am also surprised that the standard does not append to the description
of atexit something like: Whether that function is called at abnormal
program termination is implementation-defined.

-- 
walter briscoe