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

   1 /* Copyright (C) 2011-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library.  If not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <unistd.h>
  20 #include <sysdep.h>
  21
  22 /* This must be initialized data because commons can't have aliases.  */
  23 void *__curbrk = 0;
  24
  25 /* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
  26    to work around different old braindamage in the old Linux ELF dynamic
  27    linker.  */
  28 weak_alias (__curbrk, ___brk_addr)
  29
  30 int
  31 __brk (void *addr)
  32 {
  33   INTERNAL_SYSCALL_DECL (err);
  34
  35   __curbrk = (void *) INTERNAL_SYSCALL (brk, err, 1, addr);
  36   if (__curbrk < addr)
  37     {
  38       __set_errno (ENOMEM);
  39       return -1;
  40     }
  41
  42   return 0;
  43 }
  44 weak_alias (__brk, brk)