END(3)              RISC/os Reference Manual               END(3)



NAME
     end, etext, edata, eprol, _ftext, _fdata, _fbss,
          _procedure_table, _procedure_table_size,
          _procedure_string_table - locations in program, runtime
          procedure table

SYNOPSIS
     #include <syms.h>
     extern _END;
     extern _ETEXT;
     extern _EDATA;
     extern eprol;
     extern _FTEXT;
     extern _FDATA;
     extern _FBSS;
     extern _PROCEDURE_TABLE;
     extern _PROCEDURE_TABLE_SIZE;
     extern _PROCEDURE_STRING_TABLE;

DESCRIPTION
     These names refer neither to routines nor to locations with
     interesting contents except for _PROCEDURE_TABLE and
     _PROCEDURE_STRING_TABLE. Except for eprol these are all
     names of loader defined symbols.  The address of _ETEXT is
     the first address above the program text, _EDATA is above
     the initialized data region, _END is above the uninitialized
     data region, and eprol is the first instruction of the
     user's program that follows the runtime startup routine.

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

     The loader defined symbols _PROCEDURE_TABLE,
     _PROCEDURE_TABLE_SIZE and _PROCEDURE_STRING_TABLE refer to
     the data structures of the runtime procedure table.  Since
     these are loader defined symbols the data structures are
     build by ld(1) only if they are referenced.  See the include
     file <sym.h> for the definition of the runtime procedure
     table and see the include file <exception.h> for its uses.

SEE ALSO
     brk(2), malloc(3).










                        Printed 11/19/92                   Page 1