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58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/* Copyright (C) 1999-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Jakub Jelinek <jakub@redhat.com>, 1999.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <string.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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/* This is always 12, even on architectures where PAGE_SHIFT != 12. */
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#ifndef MMAP2_PAGE_SHIFT
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# define MMAP2_PAGE_SHIFT 12
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#endif
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#if MMAP2_PAGE_SHIFT == -1
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static int page_shift;
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#else
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#define page_shift MMAP2_PAGE_SHIFT
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#endif
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void *
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__mmap64 (void *addr, size_t len, int prot, int flags, int fd, off64_t offset)
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{
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#if MMAP2_PAGE_SHIFT == -1
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if (page_shift == 0)
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{
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int page_size = __getpagesize ();
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page_shift = __ffs (page_size) - 1;
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}
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#endif
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if (offset & ((1 << page_shift) - 1))
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return (void *) INLINE_SYSCALL_ERROR_RETURN_VALUE (EINVAL);
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void *result;
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result = (void *)
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INLINE_SYSCALL (mmap2, 6, addr,
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len, prot, flags, fd,
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(off_t) (offset >> page_shift));
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return result;
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}
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weak_alias (__mmap64, mmap64)
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