v7 man page for end

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NAME
       end, etext, edata - last locations in program

SYNOPSIS
       extern end;
       extern etext;
       extern edata;

DESCRIPTION
       These names refer neither to routines nor to locations with interesting contents.  The address of etext is the first address above the pro-
       gram text, edata above the initialized data region, and end above the uninitialized data region.

       When execution begins, the program break coincides with end, but many functions reset the program break, among them the routines of brk(2),
       malloc(3),  standard  input/output  (stdio(3)),	the profile (-p) option of cc(1), etc.	The current value of the program break is reliably
       returned by `sbrk(0)', see brk(2).

SEE ALSO
       brk(2), malloc(3)

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