brk(2) vs. end(3) - (nf)

[notes at ucbcad.UUCP]

#N:ucbesvax:1900001:000:361
ucbesvax!turner    Nov 24 06:19:00 1983

We're running 4.2.  The end(3) man page refers to brk(2), saying that the
value of the system break is "reliably" returned by brk(0).  But, looking
at man page brk(2), it's say nothing about this special case.  I'm not
apprised of the v7 versions--is the documentation the same on this count?
What can I assume here?
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Michael Turner (ucbvax!ucbesvax.turner)