text: /* brk system call for Linux/x86_64.
     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, see
     <http://www.gnu.org/licenses/>.  */
  
  #include <errno.h>
  #include <unistd.h>
  #include <sys/syscall.h>
  
  /* This must be initialized data because commons can't have aliases.  */
  void *__curbrk attribute_hidden = 0;
  
  int brk(void *addr)
  {
  	void *newbrk;
  
  	__asm__ ("syscall\n"
  		: "=a" (newbrk)
  		: "0" (__NR_brk), "D" (addr)
  		: "r11", "rcx"
  	);
  
  	__curbrk = newbrk;
  
  	if (newbrk < addr) {
  		__set_errno(ENOMEM);
  		return -1;
  	}
  
  	return 0;
  }
  libc_hidden_def(brk)
  