/* brk system call for Linux/i386.   Copyright (C) 1995, 1996, 2000 Free Software Foundation, Inc.   This file is part of the GNU C Library.   The GNU C Library is free software; you can redistribute it and/or   modify it under the terms of the GNU Lesser General Public   License as published by the Free Software Foundation; either   version 2.1 of the License, or (at your option) any later version.   The GNU C Library is distributed in the hope that it will be useful,   but WITHOUT ANY WARRANTY; without even the implied warranty of   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU   Lesser General Public License for more details.   You should have received a copy of the GNU Lesser General Public   License along with the GNU C Library; if not, write to the Free   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA   02111-1307 USA.  */#include <errno.h>#include <unistd.h>#include <sys/syscall.h>/* This must be initialized data because commons can't have aliases.  */void *__curbrk = 0;int brk (void *addr){    void *__unbounded newbrk, *__unbounded scratch;    asm ("movl %%ebx, %1\n"	/* Save %ebx in scratch register.  */	    "movl %3, %%ebx\n"	/* Put ADDR in %ebx to be syscall arg.  */	    "int $0x80 # %2\n"	/* Perform the system call.  */	    "movl %1, %%ebx\n"	/* Restore %ebx from scratch register.  */	    : "=a" (newbrk), "=r" (scratch)	    : "0" (__NR_brk), "g" (__ptrvalue (addr)));    __curbrk = newbrk;    if (newbrk < addr)    {	__set_errno (ENOMEM);	return -1;    }    return 0;}