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41bdb6e20c
2001-07-06 Paul Eggert <eggert@twinsun.com> * manual/argp.texi: Remove ignored LGPL copyright notice; it's not appropriate for documentation anyway. * manual/libc-texinfo.sh: "Library General Public License" -> "Lesser General Public License". 2001-07-06 Andreas Jaeger <aj@suse.de> * All files under GPL/LGPL version 2: Place under LGPL version 2.1.
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/* Copyright (C) 1999, 2000, 2001 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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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/* This is always the constant 12 for this routine, even if the actual
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page size is larger. */
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#define PAGE_SHIFT 12
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#ifdef __NR_mmap2
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extern void *__unbounded __syscall_mmap2(void *__unbounded, size_t,
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int, int, int, off_t);
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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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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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#ifdef __NR_mmap2
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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) = INLINE_SYSCALL (mmap2, 6, __ptrvalue (addr), len,
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prot, flags, fd,
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(off_t) (offset >> 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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