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/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2020 The University of Tennessee and The University
* of Tennessee Research Foundation. All rights
* reserved.
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
* University of Stuttgart. All rights reserved.
* Copyright (c) 2004-2005 The Regents of the University of California.
* All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#ifndef MCA_BTL_TCP_HDR_H
#define MCA_BTL_TCP_HDR_H
#include "opal_config.h"
#include "btl_tcp.h"
#include "opal/mca/btl/base/base.h"
BEGIN_C_DECLS
/**
* TCP header.
*/
#define MCA_BTL_TCP_HDR_TYPE_SEND 1
#define MCA_BTL_TCP_HDR_TYPE_PUT 2
#define MCA_BTL_TCP_HDR_TYPE_GET 3
#define MCA_BTL_TCP_HDR_TYPE_FIN 4
/* The MCA_BTL_TCP_HDR_TYPE_FIN is a special kind of message sent during normal
* connexion closing. Before the endpoint closes the socket, it performs a
* 1-way handshake by sending a FIN message in the socket. This lets the other
* end of the connexion discriminate between the case in which the peer has
* closed intentionnally (e.g., during MPI_FINALIZE), or unintentionally (e.g.,
* as the result of some transmission or process failure).
* The process initiating the close sends the FIN message but does not wait
* for a 2-way handshake and closes the socket immediately. Thus, the recipient
* of a FIN message can simply close the socket and mark the endpoint as closed
* without error, and without answering a FIN message itself.
*/
struct mca_btl_tcp_hdr_t {
mca_btl_base_header_t base;
uint8_t type;
uint16_t count;
uint32_t size;
};
typedef struct mca_btl_tcp_hdr_t mca_btl_tcp_hdr_t;
#define MCA_BTL_TCP_HDR_HTON(hdr) \
do { \
hdr.count = htons(hdr.count); \
hdr.size = htonl(hdr.size); \
} while (0)
#define MCA_BTL_TCP_HDR_NTOH(hdr) \
do { \
hdr.count = ntohs(hdr.count); \
hdr.size = ntohl(hdr.size); \
} while (0)
END_C_DECLS
#endif
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