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/* Copyright (C) 1999, 2000 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 1999.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. 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/mman.h>
#include <sysdep.h>
#include <sys/syscall.h>
#include <bp-checks.h>
#include "kernel-features.h"
/* This is always the constant 12 for this routine, even if the actual
page size is larger. */
#define PAGE_SHIFT 12
#ifdef __NR_mmap2
extern void *__unbounded __syscall_mmap2(void *__unbounded, size_t,
int, int, int, off_t);
#ifndef __ASSUME_MMAP2_SYSCALL
static int have_no_mmap2;
#endif
#endif
__ptr_t
__mmap64 (__ptr_t addr, size_t len, int prot, int flags, int fd, off64_t offset)
{
#ifdef __NR_mmap2
if (
# ifndef __ASSUME_MMAP2_SYSCALL
! have_no_mmap2 &&
# endif
! (offset & ((1 << PAGE_SHIFT)-1)))
{
# ifndef __ASSUME_MMAP2_SYSCALL
int saved_errno = errno;
# endif
__ptr_t result;
__ptrvalue (result) = INLINE_SYSCALL (mmap2, 6, __ptrvalue (addr), len, prot,
flags, fd, (off_t) (offset >> PAGE_SHIFT));
# if __BOUNDED_POINTERS__
__ptrlow (result) = __ptrvalue (result);
__ptrhigh (result) = __ptrvalue (result) + len;
# endif
# ifndef __ASSUME_MMAP2_SYSCALL
if (result != (__ptr_t) -1 || errno != ENOSYS)
# endif
return result;
# ifndef __ASSUME_MMAP2_SYSCALL
__set_errno (saved_errno);
have_no_mmap2 = 1;
# endif
}
#endif
if (offset != (off_t) offset || (offset + len) != (off_t) (offset + len))
{
__set_errno (EINVAL);
return MAP_FAILED;
}
return __mmap (addr, len, prot, flags, fd, (off_t) offset);
}
weak_alias (__mmap64, mmap64)
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