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.\" 30.Dd August 28, 2000 31.Dt END 3 32.Os 33.Sh NAME 34.Nm end , 35.Nm etext , 36.Nm edata 37.Nd end boundaries of image segments 38.Sh SYNOPSIS 39.Vt extern end ; 40.Vt extern etext ; 41.Vt extern edata ; 42.Sh DESCRIPTION 43The globals 44.Va end , etext 45and 46.Va edata 47are program segment end addresses. 48.Pp 49.Va etext 50is the first address after the end of the text segment. 51.Pp 52.Va edata 53is the first address after the end of the initialized data segment. 54.Pp 55.Va end 56is the first address after the end of the data segment 57.Pq Tn BSS 58when the program is loaded. 59Use the 60.Xr sbrk 2 61.\".Fn sbrk 0 62system call with zero as its argument to find the current end of the 63data segment. 64.Sh SEE ALSO 65.Xr sbrk 2 , 66.Xr malloc 3 , 67.Xr a.out 5 68.Sh HISTORY 69An 70.Nm 71manual page appeared in 72.At v6 . 73.Sh BUGS 74Traditionally, no variable existed that pointed to the start of the 75text segment because the text segment always started at address zero. 76Although it is no longer valid to make this assumption, no 77variable similar to the ones documented above exists to point to the 78start of the text segment. 79