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/*
* Copyright (c) 2018 Ant Financial Services Group.
* 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.
*/
#ifndef _TLE_GLUE_ZEROCOPY_H_
#define _TLE_GLUE_ZEROCOPY_H_
#ifdef __cplusplus
extern "C" {
#endif
/**
* This API performs recv operation on specified socket, and it's
* optimized for zero copy, which means the caller does not need to
* prepare the buffer, instead, it will get a pointer on success.
* @param sockfd
* the file descriptor for the socket.
* @param buf
* after successfully receiving some payload, the pointer of the
* received buffer will be stored in *buf.
* @return
* the number of bytes received, or -1 if an error occurred, or 0
* if a stream socket peer has performed an orderly shutdown.
*
*/
ssize_t recv_zc(int sockfd, void **buf);
/**
* This API performs send operation on specified socket, and it's
* optimized for zero copy, which means the caller does not need to
* free the buffer, not even touch that buffer even after calling this
* API; the buffer will be freed after an ack from the socket peer.
* @param sockfd
* the file descriptor for the socket.
* @param buf
* The pointer to the payload buffer to be sent.
* @param len
* The length of the payload buffer to be sent.
* @return
* the number of bytes sent, or -1 if an error occurred.
*/
ssize_t send_zc(int sockfd, const void *buf, size_t len);
#ifdef __cplusplus
}
#endif
#endif /*_TLE_GLUE_ZEROCOPY_H_ */
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