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