/* brk system call for Linux/i386.

   Copyright (C) 1995-2018 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/>.  */

#if BUILD_PIE_DEFAULT

/* Can't use "call *%gs:SYSINFO_OFFSET" during statup in static PIE.  */

# define I386_USE_SYSENTER 0

#endif

#include <errno.h>

#include <unistd.h>

#include <sysdep.h>

/* This must be initialized data because commons can't have aliases.  */

void *__curbrk = 0;

/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt

   to work around different old braindamage in the old Linux ELF dynamic

   linker.  */

weak_alias (__curbrk, ___brk_addr)

int

__brk (void *addr)

{

  INTERNAL_SYSCALL_DECL (err);

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

  __curbrk = newbrk;

  if (newbrk < addr)

    return INLINE_SYSCALL_ERROR_RETURN_VALUE (ENOMEM);

  return 0;

}

weak_alias (__brk, brk)