mirror of
git://sourceware.org/git/glibc.git
synced 2024-12-27 04:41:02 +08:00
608d481e6b
2001-01-21 Franz Sirl <Franz.Sirl-kernel@lauterbach.com> * sysdeps/unix/sysv/linux/powerpc/mmap64.c: Correctly mask offset. 2001-01-21 Ulrich Drepper <drepper@redhat.com> * malloc/malloc.c: Remove a few unnecessary initializers of global variables.
83 lines
2.4 KiB
C
83 lines
2.4 KiB
C
/* 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)
|