END(3) Library Functions Manual END(3)
end, etext, edata - last locations in program
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 unini-
tialized 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).