There is an API that walks through IFS files and directories -
Now here's where things get murky - When you call this, you specify a
path and some inclusion criteria - and either the name of a program or
address of a procedure - and the documentation calls this an exit
program - it smells to me like what I think of as a callback - sheesh!!
I think I see a callback as connected to a repetitive process, while an
exit program is a one-time thing - but THIS API doc uses the term "exit"
for the repetitive event kind of thing.
Now another API is readdir() - this one returns a structure for the NEXT
item it finds in the directory - so YOU have to run this in a loop until
no more objects are found. The first API itself contains the processing
loop - that first API seems to fit the idea, again, of the use of
callback functions or programs. Pretty neat!
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