What happens when realloc() returns NULL?

[Conor P. Cahill]

In article <TOM.89Aug30231415 at yang.cpac.washington.edu>, tom at yang.cpac.washington.edu (Tom May) writes:
> and malloc() returns non-NULL, but realloc() returns NULL, is the memory
> pointed to by p1 still allocated?

This is yet another one of those RTFMs.  The malloc page (under
the DIAGNOSTICS section) clearly states the following:

System V Rel 3.x:	When realloc returns NULL, the block pointed to by
       &		ptr is left intact.
SCO Xenix 2.3.2


System V Rel 2.x:	When this happens the block pointed to by ptr may
       			be destroyed.

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