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