1.\" Copyright (c) 1986 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)end.3 6.4 (Berkeley) 1/24/94 29.\" $FreeBSD: src/share/man/man3/end.3,v 1.3.2.3 2001/01/12 16:16:01 ru Exp $ 30.\" $DragonFly: src/share/man/man3/end.3,v 1.2 2003/06/17 04:36:58 dillon Exp $ 31.\" 32.Dd August 28, 2000 33.Dt END 3 34.Os 35.Sh NAME 36.Nm end , 37.Nm etext , 38.Nm edata 39.Nd end boundaries of image segments 40.Sh SYNOPSIS 41.Vt extern end ; 42.Vt extern etext ; 43.Vt extern edata ; 44.Sh DESCRIPTION 45The globals 46.Va end , etext 47and 48.Va edata 49are program segment end addresses. 50.Pp 51.Va etext 52is the first address after the end of the text segment. 53.Pp 54.Va edata 55is the first address after the end of the initialized data segment. 56.Pp 57.Va end 58is the first address after the end of the data segment 59.Pq Tn BSS 60when the program is loaded. 61Use the 62.Xr sbrk 2 63.\".Fn sbrk 0 64system call with zero as its argument to find the current end of the 65data segment. 66.Sh SEE ALSO 67.Xr sbrk 2 , 68.Xr malloc 3 , 69.Xr a.out 5 70.Sh HISTORY 71An 72.Nm 73manual page appeared in 74.At v6 . 75.Sh BUGS 76Traditionally, no variable existed that pointed to the start of the 77text segment because the text segment always started at address zero. 78Although it is no longer valid to make this assumption, no 79variable similar to the ones documented above exists to point to the 80start of the text segment. 81