84 lines
2.9 KiB
Groff
84 lines
2.9 KiB
Groff
.\" Copyright (c) 1986
|
|
.\" The Regents of the University of California. All rights reserved.
|
|
.\"
|
|
.\" Redistribution and use in source and binary forms, with or without
|
|
.\" modification, are permitted provided that the following conditions
|
|
.\" are met:
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer.
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. All advertising materials mentioning features or use of this software
|
|
.\" must display the following acknowledgement:
|
|
.\" This product includes software developed by the University of
|
|
.\" California, Berkeley and its contributors.
|
|
.\" 4. Neither the name of the University nor the names of its contributors
|
|
.\" may be used to endorse or promote products derived from this software
|
|
.\" without specific prior written permission.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
.\" SUCH DAMAGE.
|
|
.\"
|
|
.\" @(#)end.3 6.4 (Berkeley) 1/24/94
|
|
.\" $FreeBSD$
|
|
.\"
|
|
.Dd August 28, 2000
|
|
.Dt END 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm end ,
|
|
.Nm etext ,
|
|
.Nm edata
|
|
.Nd end boundaries of image segments
|
|
.Sh SYNOPSIS
|
|
.Vt extern end;
|
|
.Vt extern etext;
|
|
.Vt extern edata;
|
|
.Sh DESCRIPTION
|
|
The globals
|
|
.Va end , etext
|
|
and
|
|
.Va edata
|
|
are program segment end addresses.
|
|
.Pp
|
|
.Va etext
|
|
is the first address after the end of the text segment.
|
|
.Pp
|
|
.Va edata
|
|
is the first address after the end of the initialized data segment.
|
|
.Pp
|
|
.Va end
|
|
is the first address after the end of the data segment
|
|
.Pq Tn BSS
|
|
when the program is loaded.
|
|
Use the
|
|
.Xr sbrk 2
|
|
.\".Fn sbrk 0
|
|
system call with zero as its argument to find the current end of the
|
|
data segment.
|
|
.Sh SEE ALSO
|
|
.Xr sbrk 2 ,
|
|
.Xr malloc 3 ,
|
|
.Xr a.out 5
|
|
.Sh HISTORY
|
|
An
|
|
.Nm
|
|
manual page appeared in
|
|
.At v6 .
|
|
.Sh BUGS
|
|
Traditionally, no variable existed that pointed to the start of the
|
|
text segment because the text segment always started at address zero.
|
|
Although it is no longer valid to make this assumption, no
|
|
variable similar to the ones documented above exists to point to the
|
|
start of the text segment.
|