END(3C)
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 program text, edata above the initialized data region, and end above the uninitialized data region.
When execution begins, the program break coincides with end, but the program break may be reset by the routines of brk(2), malloc(3C), standard input/output (stdio(3S)), the profile (−p) option of cc(1), and so on. Thus, the current value of the program break should be determined by “sbrk(0)” (see brk(2)).
These symbols are accessible from assembly language if it is remembered that they should be prefixed by _.