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50 lines
1.8 KiB
C
50 lines
1.8 KiB
C
/* Copyright (C) 1994-2016 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 <sys/types.h>
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#include <sys/mman.h>
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#include <errno.h>
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/* Map addresses starting near ADDR and extending for LEN bytes. From
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OFFSET into the file FD describes according to PROT and FLAGS. If ADDR
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is nonzero, it is the desired mapping address. If the MAP_FIXED bit is
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set in FLAGS, the mapping will be at ADDR exactly (which must be
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page-aligned); otherwise the system chooses a convenient nearby address.
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The return value is the actual mapping address chosen or MAP_FAILED
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for errors (in which case `errno' is set). A successful `mmap' call
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deallocates any previous mapping for the affected region. */
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#include <sysdep.h>
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__ptr_t
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__mmap (__ptr_t addr, size_t len, int prot, int flags, int fd, off_t offset)
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{
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__ptr_t ret;
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ret = (__ptr_t) INLINE_SYSCALL (mmap, 6, addr, len, prot, flags, fd, offset);
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/* check if it's really a negative number */
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if(((unsigned long)ret & 0xfffff000) == 0xfffff000)
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return MAP_FAILED;
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return ret;
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}
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weak_alias (__mmap, mmap)
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