osf1 man page for etext

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NAME
       end, etext, edata - Defines the last location of a program

SYNOPSIS
       extern end; extern etext; extern edata;

DESCRIPTION
       The external names end, etext, and edata are defined for all programs.  They are not functions, but identifiers associated with the follow-
       ing addresses: The first address following the program text.  The first address following the initialized data region.  The  first  address
       following the data region that is not initialized.

       The  break  value  of  the program is the first location beyond the data.  When a program begins running, this location coincides with end.
       However, many factors can change the break value, including: The brk() function The malloc() function The standard  I/O	functions  The	-p
       flag on the cc command

       Therefore, use sbrk(0), not end, to determine the break value of the program.

SEE ALSO
       Functions: brk(2), malloc(3)

       Commands: cc(1)

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