92 lines
3.6 KiB
C++
92 lines
3.6 KiB
C++
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/*
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* Copyright (C) 2008 The Android Open Source Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/uio.h>
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// System calls we need.
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extern "C" int __preadv64(int, const struct iovec*, int, long, long);
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extern "C" int __preadv64v2(int, const struct iovec*, int, long, long, int);
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extern "C" int __pwritev64(int, const struct iovec*, int, long, long);
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extern "C" int __pwritev64v2(int, const struct iovec*, int, long, long, int);
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// There is no 32-bit off_t preadv/pwritev (even on LP32).
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// To avoid 32-bit ABI issues about which register pairs you're allowed
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// to pass 64-bit values in, the kernel just takes two `long` arguments --
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// which are int32_t for LP32, remember -- and stitches them together.
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// It even does this for LP64, taking a second unused always-zero `long`.
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// (The first long was int64_t, which is the same as off64_t.)
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// The pair is split lo-hi (not hi-lo, as llseek is).
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ssize_t preadv(int fd, const struct iovec* ios, int count, off_t offset) {
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return preadv64(fd, ios, count, offset);
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}
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ssize_t preadv64(int fd, const struct iovec* ios, int count, off64_t offset) {
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#if defined(__LP64__)
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return __preadv64(fd, ios, count, offset, 0);
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#else
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return __preadv64(fd, ios, count, offset, offset >> 32);
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#endif
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}
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ssize_t pwritev(int fd, const struct iovec* ios, int count, off_t offset) {
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return pwritev64(fd, ios, count, offset);
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}
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ssize_t pwritev64(int fd, const struct iovec* ios, int count, off64_t offset) {
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#if defined(__LP64__)
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return __pwritev64(fd, ios, count, offset, 0);
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#else
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return __pwritev64(fd, ios, count, offset, offset >> 32);
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#endif
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}
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ssize_t preadv2(int fd, const struct iovec* ios, int count, off_t offset, int flags) {
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return preadv64v2(fd, ios, count, offset, flags);
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}
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ssize_t preadv64v2(int fd, const struct iovec* ios, int count, off64_t offset, int flags) {
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#if defined(__LP64__)
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return __preadv64v2(fd, ios, count, offset, 0, flags);
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#else
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return __preadv64v2(fd, ios, count, offset, offset >> 32, flags);
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#endif
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}
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ssize_t pwritev2(int fd, const struct iovec* ios, int count, off_t offset, int flags) {
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return pwritev64v2(fd, ios, count, offset, flags);
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}
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ssize_t pwritev64v2(int fd, const struct iovec* ios, int count, off64_t offset, int flags) {
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#if defined(__LP64__)
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return __pwritev64v2(fd, ios, count, offset, 0, flags);
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#else
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return __pwritev64v2(fd, ios, count, offset, offset >> 32, flags);
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#endif
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}
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