Unknown | 83 lines | 83 code | 0 blank | 0 comment | 0 complexity | 14acea02eaaaaa771e31c851a27f2eb6 MD5 | raw file
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. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)end.3 6.4 (Berkeley) 1/24/94 33.\" $FreeBSD$ 34.\" 35.Dd August 28, 2000 36.Dt END 3 37.Os 38.Sh NAME 39.Nm end , 40.Nm etext , 41.Nm edata 42.Nd end boundaries of image segments 43.Sh SYNOPSIS 44.Vt extern end ; 45.Vt extern etext ; 46.Vt extern edata ; 47.Sh DESCRIPTION 48The globals 49.Va end , etext 50and 51.Va edata 52are program segment end addresses. 53.Pp 54.Va etext 55is the first address after the end of the text segment. 56.Pp 57.Va edata 58is the first address after the end of the initialized data segment. 59.Pp 60.Va end 61is the first address after the end of the data segment 62.Pq Tn BSS 63when the program is loaded. 64Use the 65.Xr sbrk 2 66.\".Fn sbrk 0 67system call with zero as its argument to find the current end of the 68data segment. 69.Sh SEE ALSO 70.Xr sbrk 2 , 71.Xr malloc 3 , 72.Xr a.out 5 73.Sh HISTORY 74An 75.Nm 76manual page appeared in 77.At v6 . 78.Sh BUGS 79Traditionally, no variable existed that pointed to the start of the 80text segment because the text segment always started at address zero. 81Although it is no longer valid to make this assumption, no 82variable similar to the ones documented above exists to point to the 83start of the text segment.