@miconda — have you had the chance to consider a better solution to this issue?
I am thinking of going through the various modules and see how they check for rank:

/* ???? have an escape for a module if the module needs to do
* does something for PROC_INIT, PROC_MAIN and rank > 0 (and small negative integers PROC_TCP etc)
* then do nothing and return here ???? */
if (rank < PROC_MAIN_ONLY) return 0; // PROC_MAIN_ONLY == -128

Then to apply this PR I could set

PROC_POST_FORK = -129
// other new ranks can be created with values < -128 and all modules would not be affected

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