42 lines
1.2 KiB
C++
42 lines
1.2 KiB
C++
/*
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* Copyright 2016-present Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <folly/portability/Config.h>
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#include <folly/portability/IOVec.h>
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#include <folly/portability/SysTypes.h>
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#if !FOLLY_HAVE_PREADV
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extern "C" ssize_t preadv(int fd, const iovec* iov, int count, off_t offset);
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#endif
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#if !FOLLY_HAVE_PWRITEV
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extern "C" ssize_t pwritev(int fd, const iovec* iov, int count, off_t offset);
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#endif
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#ifdef _WIN32
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extern "C" ssize_t readv(int fd, const iovec* iov, int count);
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extern "C" ssize_t writev(int fd, const iovec* iov, int count);
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#endif
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namespace folly {
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#ifdef IOV_MAX // not defined on Android
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constexpr size_t kIovMax = IOV_MAX;
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#else
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constexpr size_t kIovMax = UIO_MAXIOV;
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#endif
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} // namespace folly
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