NAME
end, edata, etext, __data_start, __text_start — last locations in program
SYNOPSIS
extern void *_end, *end, *_etext, *etext, *_edata, *edata, *__data_start,
*__text_start;
DESCRIPTION
These names refer neither to routines nor to locations
with interesting contents.
The address of the symbols
_etext
and
etext
is the first address above the program text.
The address of
_edata
and
edata
is the first address above the initialized data region.
The address of
_end
and
end
is the first address above the uninitialized data region.
The address of the symbol
__data_start
is the beginning address of the program's data area, and
__text_start
is the beginning address of the program's text area.
The linker defines these symbols with the appropriate values
if they are referenced by the program but not defined.
The linker issues an error if the user attempts to define
_edata,
_etext,
_end,
__data_start,
or
__text_start.
When execution begins, the program break
(the first location beyond the data) coincides with
_end,
but the program break can 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)).
WARNINGS
In C, these names must look like addresses.
Thus, use
&end
instead of
end
to access the current value of
end.
SEE ALSO
System Tools
- cc(1)
Invoke the HP-UX C compiler
- ld(1)
Invoke the link editor
Miscellaneous
- brk(2)
Change data segment space allocation
- crt0(3)
Execution startup routine
- malloc(3C)
Main memory allocator
- stdio(3S)
Standard buffered input/output stream file package
STANDARDS CONFORMANCE
end(): XPG2
edata(): XPG2
etext(): XPG2
Printable version
