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102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/* Copyright (C) 1999,2000,2001,2002,2006,2010 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 <sysdep.h>
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#include <sys/syscall.h>
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#include <bp-checks.h>
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#include <kernel-features.h>
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#ifdef __NR_mmap2
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/* This is always 12, even on architectures where PAGE_SHIFT != 12. */
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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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# ifndef MMAP2_PAGE_SHIFT
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# define MMAP2_PAGE_SHIFT 12
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# endif
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# define page_shift MMAP2_PAGE_SHIFT
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# endif
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# ifndef __ASSUME_MMAP2_SYSCALL
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static int have_no_mmap2;
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# endif
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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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#ifdef __NR_mmap2
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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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while ((1 << ++page_shift) != page_size)
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;
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}
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# endif
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if (offset & ((1 << page_shift) - 1))
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{
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__set_errno (EINVAL);
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return MAP_FAILED;
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}
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# ifndef __ASSUME_MMAP2_SYSCALL
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if (! have_no_mmap2)
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# endif
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{
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# ifndef __ASSUME_MMAP2_SYSCALL
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int saved_errno = errno;
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# endif
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void *result;
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__ptrvalue (result) = (void *__unbounded)
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INLINE_SYSCALL (mmap2, 6, __ptrvalue (addr),
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len, prot, flags, fd,
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(off_t) (offset >> MMAP2_PAGE_SHIFT));
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# if __BOUNDED_POINTERS__
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__ptrlow (result) = __ptrvalue (result);
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__ptrhigh (result) = __ptrvalue (result) + len;
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# endif
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# ifndef __ASSUME_MMAP2_SYSCALL
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if (result != MAP_FAILED || errno != ENOSYS)
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# endif
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return result;
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# ifndef __ASSUME_MMAP2_SYSCALL
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__set_errno (saved_errno);
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have_no_mmap2 = 1;
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# endif
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}
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#endif
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#ifndef __ASSUME_MMAP2_SYSCALL
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if (offset != (off_t) offset || (offset + len) != (off_t) (offset + len))
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{
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__set_errno (EINVAL);
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return MAP_FAILED;
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}
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return __mmap (addr, len, prot, flags, fd, (off_t) offset);
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#endif
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}
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weak_alias (__mmap64, mmap64)
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