ultrix man page for etext

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Name
       end, etext, edata - last locations in program

Syntax
       extern end;
       extern etext;
       extern edata;
       extern eprol;

Description
       These  names  refer  neither to routines nor to locations with interesting contents.  The address of is the first address above the program
       text, above the initialized data region, and is the first instruction of the user's program that follows the runtime startup routine.

       When execution begins, the program break coincides with but it is reset by the routines standard input/output the profile  (-p)	option	of
       and so forth.  The current value of the program break is reliably returned by sbrk(0).  For further information, see

See Also
       cc(1), brk(2), malloc(3), stdio(3s)

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