1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 #include <sys/types.h> 29 #include <sys/systm.h> 30 #include <sys/errno.h> 31 32 /* 33 * The brk() system call needs to be in-kernel because Linux expects a call to 34 * brk(0) to return the current breakpoint. In Solaris, the process breakpoint 35 * is setup and managed by libc. Due to the way we link our libraries and the 36 * need for Linux to manage its own breakpoint, this has to remain in the 37 * kernel. 38 */ 39 extern int brk(caddr_t); 40 41 long 42 lx_brk(caddr_t nva) 43 { 44 proc_t *p = curproc; 45 klwp_t *lwp = ttolwp(curthread); 46 47 if (nva != 0) { 48 (void) brk(nva); 49 50 /* 51 * Despite claims to the contrary in the manpage, when Linux 52 * brk() fails, errno is left unchanged. 53 */ 54 lwp->lwp_errno = 0; 55 } 56 return ((long)(p->p_brkbase + p->p_brksize)); 57 }