sysdeps/unix/sysv/linux/am33/brk.c

   1 /* brk system call for Linux/am33.
   2    Copyright (C) 1995, 1996, 2000 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Alexandre Oliva <aoliva@redhat.com>.
   5    Based on ../i386/brk.c.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Library General Public License as
   9    published by the Free Software Foundation; either version 2 of the
  10    License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  19    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #include <errno.h>
  23 #include <unistd.h>
  24 #include <sysdep.h>
  25
  26 /* This must be initialized data because commons can't have aliases.  */
  27 void *__curbrk = 0;
  28
  29 int
  30 __brk (void *addr)
  31 {
  32   void *newbrk;
  33
  34   newbrk = INLINE_SYSCALL (brk, 1, __ptrvalue (addr));
  35
  36   __curbrk = newbrk;
  37
  38   if (newbrk < addr)
  39     {
  40       __set_errno (ENOMEM);
  41       return -1;
  42     }
  43
  44   return 0;
  45 }
  46 weak_alias (__brk, brk)