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/*
API for writing a packet
Copyright (C) Amitay Isaacs 2015
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef __CTDB_PKT_WRITE_H__
#define __CTDB_PKT_WRITE_H__
#include <talloc.h>
#include <tevent.h>
/**
* @file pkt_write.h
*
* @brief Write a packet.
*
* Write a complete packet with possibly multiple system calls.
*/
/**
* @brief Start async computation to write a packet
*
* This returns a tevent request to write a packet to given fd. The fd
* should be nonblocking. Freeing this request will free all the memory
* associated with the request.
*
* @param[in] mem_ctx Talloc memory context
* @param[in] ev Tevent context
* @param[in] fd The non-blocking file/socket descriptor to write to
* @param[in] buf The data
* @param[in] buflen The size of the data
* @return new tevent request or NULL on failure
*/
struct tevent_req *pkt_write_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
int fd, uint8_t *buf, size_t buflen);
/**
* @brief Function to actually write data to the socket
*
* This function should be called, when tevent fd event is triggered
* for TEVENT_FD_WRITE event. This function has the syntax of
* tevent_fd_handler_t. The private_data for this function is the tevent
* request created by pkt_write_send function.
*
* @param[in] ev Tevent context
* @param[in] fde Tevent fd context
* @param[in] flags Tevent fd flags
* @param[in] req The active tevent request
*/
void pkt_write_handler(struct tevent_context *ev, struct tevent_fd *fde,
uint16_t flags, struct tevent_req *req);
/**
* @brief Packet is sent
*
* This function returns the number of bytes written.
*
* @param[in] req Tevent request
* @param[out] perrno errno in case of failure
* @return the number of bytes written, or -1 on failure
*/
ssize_t pkt_write_recv(struct tevent_req *req, int *perrno);
#endif /* __CTDB_PKT_WRITE_H__ */
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