mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-28 15:51:07 +00:00
102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/* Copyright (C) 1999,2000,2001,2002,2006,2010 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 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/>. */
|
|
|
|
#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>
|
|
|
|
#ifdef __NR_mmap2
|
|
|
|
/* This is always 12, even on architectures where PAGE_SHIFT != 12. */
|
|
# if MMAP2_PAGE_SHIFT == -1
|
|
static int page_shift;
|
|
# else
|
|
# ifndef MMAP2_PAGE_SHIFT
|
|
# define MMAP2_PAGE_SHIFT 12
|
|
# endif
|
|
# define page_shift MMAP2_PAGE_SHIFT
|
|
# endif
|
|
|
|
# ifndef __ASSUME_MMAP2_SYSCALL
|
|
static int have_no_mmap2;
|
|
# endif
|
|
#endif
|
|
|
|
|
|
void *
|
|
__mmap64 (void *addr, size_t len, int prot, int flags, int fd, off64_t offset)
|
|
{
|
|
#ifdef __NR_mmap2
|
|
# if MMAP2_PAGE_SHIFT == -1
|
|
if (page_shift == 0)
|
|
{
|
|
int page_size = getpagesize ();
|
|
while ((1 << ++page_shift) != page_size)
|
|
;
|
|
}
|
|
# endif
|
|
if (offset & ((1 << page_shift) - 1))
|
|
{
|
|
__set_errno (EINVAL);
|
|
return MAP_FAILED;
|
|
}
|
|
# ifndef __ASSUME_MMAP2_SYSCALL
|
|
if (! have_no_mmap2)
|
|
# endif
|
|
{
|
|
# ifndef __ASSUME_MMAP2_SYSCALL
|
|
int saved_errno = errno;
|
|
# endif
|
|
void *result;
|
|
__ptrvalue (result) = (void *__unbounded)
|
|
INLINE_SYSCALL (mmap2, 6, __ptrvalue (addr),
|
|
len, prot, flags, fd,
|
|
(off_t) (offset >> MMAP2_PAGE_SHIFT));
|
|
# if __BOUNDED_POINTERS__
|
|
__ptrlow (result) = __ptrvalue (result);
|
|
__ptrhigh (result) = __ptrvalue (result) + len;
|
|
# endif
|
|
# ifndef __ASSUME_MMAP2_SYSCALL
|
|
if (result != MAP_FAILED || errno != ENOSYS)
|
|
# endif
|
|
return result;
|
|
|
|
# ifndef __ASSUME_MMAP2_SYSCALL
|
|
__set_errno (saved_errno);
|
|
have_no_mmap2 = 1;
|
|
# endif
|
|
}
|
|
#endif
|
|
#ifndef __ASSUME_MMAP2_SYSCALL
|
|
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);
|
|
#endif
|
|
}
|
|
weak_alias (__mmap64, mmap64)
|