What if I don't free() all my dynamically allocated memory?

[Peter da Silva]

The underlying operating system may not do it, but your C library's
implementation of malloc() should include code that automatically cleans
up memory when you exit(). I don't think this is in the standard, but it's
sure a quality of implementation issue.

As for operating systems that don't clean up when a program exits, there are
operating systems, particularly message-passing ones, that do not have the
notion of the owner of a block of memory. Memory is allocated and passed to
other programs continually.
-- 
Peter da Silva, Xenix Support, Ferranti International Controls Corporation.

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