uclibc-ng/libc/sysdeps/linux/arm/brk.c

/* brk system call for Linux/ARM.
   Copyright (C) 1995, 1996 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>

libc_hidden_proto(brk)

/* This must be initialized data because commons can't have aliases.  */
extern void *__curbrk;
libc_hidden_proto(__curbrk)
void *__curbrk = 0;
libc_hidden_data_def(__curbrk)

int brk (void *addr)
{
	void *newbrk = (void*)INTERNAL_SYSCALL(brk, , 1, addr);

	__curbrk = newbrk;

	if (newbrk < addr) {
		__set_errno (ENOMEM);
		return -1;
	}

	return 0;
}
libc_hidden_def(brk)