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