lx_brk.c revision 9acbbeaf2a1ffe5c14b244867d427714fab43c5c
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/types.h>
#include <sys/systm.h>
#include <sys/errno.h>
/*
* The brk() system call needs to be in-kernel because Linux expects a call to
* brk(0) to return the current breakpoint. In Solaris, the process breakpoint
* is setup and managed by libc. Due to the way we link our libraries and the
* need for Linux to manage its own breakpoint, this has to remain in the
* kernel.
*/
extern int brk(caddr_t);
long
lx_brk(caddr_t nva)
{
proc_t *p = curproc;
klwp_t *lwp = ttolwp(curthread);
if (nva != 0) {
(void) brk(nva);
/*
* Despite claims to the contrary in the manpage, when Linux
* brk() fails, errno is left unchanged.
*/
lwp->lwp_errno = 0;
}
out:
return ((long)(p->p_brkbase + p->p_brksize));
}