modbus-tcp.c File Reference

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <signal.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <poll.h>
#include <netdb.h>
#include "modbus-private.h"
#include "modbus-tcp.h"
#include "modbus-tcp-private.h"
#include "modbus-rtu.h"
#include "modbus-rtu-private.h"

Include dependency graph for modbus-tcp.c:

Macros
#define	MSG_NOSIGNAL   0

Functions
int	_modbus_set_slave (modbus_t *ctx, int slave)
int	_modbus_tcp_build_request_basis (modbus_t *ctx, int function, int addr, int nb, uint8_t *req)
int	_modbus_tcp_build_response_basis (sft_t *sft, uint8_t *rsp)
int	_modbus_tcp_prepare_response_tid (const uint8_t *req, int *req_length)
int	_modbus_tcp_send_msg_pre (uint8_t *req, int req_length)
ssize_t	_modbus_tcp_send (modbus_t *ctx, const uint8_t *req, int req_length)
ssize_t	_modbus_tcp_recv (modbus_t *ctx, uint8_t *rsp, int rsp_length)
int	_modbus_tcp_check_integrity (modbus_t *ctx, uint8_t *msg, const int msg_length)
int	_modbus_tcp_pre_check_confirmation (modbus_t *ctx, const uint8_t *req, const uint8_t *rsp, int rsp_length)
int	_modbus_tcp_set_ipv4_options (int s)
int	_modbus_tcp_connect (modbus_t *ctx)
int	_modbus_tcp_pi_connect (modbus_t *ctx)
void	_modbus_tcp_close (modbus_t *ctx)
int	_modbus_tcp_flush (modbus_t *ctx)
int	modbus_tcp_listen (modbus_t *ctx, int nb_connection)
int	modbus_tcp_pi_listen (modbus_t *ctx, int nb_connection)
int	modbus_tcp_accept (modbus_t *ctx, int *socket)
int	modbus_tcp_pi_accept (modbus_t *ctx, int *socket)
int	_modbus_tcp_select (modbus_t *ctx, fd_set *rfds, struct timeval *tv, int length_to_read)
int	_modbus_tcp_filter_request (modbus_t *ctx, int slave)
modbus_t *	modbus_new_tcp (const char *ip, int port)
modbus_t *	modbus_new_tcp_pi (const char *node, const char *service)
int	_modbus_rtu_build_request_basis (modbus_t *ctx, int function, int addr, int nb, uint8_t *req)
int	_modbus_rtu_build_response_basis (sft_t *sft, uint8_t *rsp)
int	_modbus_rtu_prepare_response_tid (const uint8_t *req, int *req_length)
int	_modbus_rtu_send_msg_pre (uint8_t *req, int req_length)
int	_modbus_rtu_check_integrity (modbus_t *ctx, uint8_t *msg, const int msg_length)
int	_modbus_rtu_filter_request (modbus_t *ctx, int slave)
uint16_t	crc16 (uint8_t *buffer, uint16_t buffer_length)
int	_modbus_rtutcp_check_integrity (modbus_t *ctx, uint8_t *msg, const int msg_length)
modbus_t *	modbus_new_rtutcp (const char *ip, int port)

Variables
const modbus_backend_t	_modbus_tcp_backend
const modbus_backend_t	_modbus_tcp_pi_backend
const modbus_backend_t	_modbus_rtutcp_backend

Macro Definition Documentation

MSG_NOSIGNAL

#define MSG_NOSIGNAL   0

Function Documentation

_modbus_rtu_build_request_basis()

int _modbus_rtu_build_request_basis	(	modbus_t *	ctx,
		int	function,
		int	addr,
		int	nb,
		uint8_t *	req
	)

_modbus_rtu_build_response_basis()

int _modbus_rtu_build_response_basis	(	sft_t *	sft,
		uint8_t *	rsp
	)

_modbus_rtu_check_integrity()

int _modbus_rtu_check_integrity	(	modbus_t *	ctx,
		uint8_t *	msg,
		const int	msg_length
	)

_modbus_rtu_filter_request()

int _modbus_rtu_filter_request	(	modbus_t *	ctx,
		int	slave
	)

_modbus_rtu_prepare_response_tid()

int _modbus_rtu_prepare_response_tid	(	const uint8_t *	req,
		int *	req_length
	)

_modbus_rtu_send_msg_pre()

int _modbus_rtu_send_msg_pre	(	uint8_t *	req,
		int	req_length
	)

_modbus_rtutcp_check_integrity()

int _modbus_rtutcp_check_integrity	(	modbus_t *	ctx,
		uint8_t *	msg,
		const int	msg_length
	)

_modbus_set_slave()

int _modbus_set_slave	(	modbus_t *	ctx,
		int	slave
	)

_modbus_tcp_build_request_basis()

int _modbus_tcp_build_request_basis	(	modbus_t *	ctx,
		int	function,
		int	addr,
		int	nb,
		uint8_t *	req
	)

_modbus_tcp_build_response_basis()

int _modbus_tcp_build_response_basis	(	sft_t *	sft,
		uint8_t *	rsp
	)

_modbus_tcp_check_integrity()

int _modbus_tcp_check_integrity	(	modbus_t *	ctx,
		uint8_t *	msg,
		const int	msg_length
	)

_modbus_tcp_close()

void _modbus_tcp_close

(

modbus_t *

ctx

)

_modbus_tcp_connect()

int _modbus_tcp_connect

(

modbus_t *

ctx

)

_modbus_tcp_filter_request()

int _modbus_tcp_filter_request	(	modbus_t *	ctx,
		int	slave
	)

_modbus_tcp_flush()

int _modbus_tcp_flush

(

modbus_t *

ctx

)

_modbus_tcp_pi_connect()

int _modbus_tcp_pi_connect

(

modbus_t *

ctx

)

_modbus_tcp_pre_check_confirmation()

int _modbus_tcp_pre_check_confirmation	(	modbus_t *	ctx,
		const uint8_t *	req,
		const uint8_t *	rsp,
		int	rsp_length
	)

_modbus_tcp_prepare_response_tid()

int _modbus_tcp_prepare_response_tid	(	const uint8_t *	req,
		int *	req_length
	)

_modbus_tcp_recv()

ssize_t _modbus_tcp_recv	(	modbus_t *	ctx,
		uint8_t *	rsp,
		int	rsp_length
	)

_modbus_tcp_select()

int _modbus_tcp_select	(	modbus_t *	ctx,
		fd_set *	rfds,
		struct timeval *	tv,
		int	length_to_read
	)

_modbus_tcp_send()

ssize_t _modbus_tcp_send	(	modbus_t *	ctx,
		const uint8_t *	req,
		int	req_length
	)

_modbus_tcp_send_msg_pre()

int _modbus_tcp_send_msg_pre	(	uint8_t *	req,
		int	req_length
	)

_modbus_tcp_set_ipv4_options()

int _modbus_tcp_set_ipv4_options

(

int

s

)

Cygwin defines IPTOS_LOWDELAY but can't handle that flag so it's necessary to workaround that problem.

crc16()

uint16_t crc16	(	uint8_t *	buffer,
		uint16_t	buffer_length
	)

modbus_new_rtutcp()

modbus_t* modbus_new_rtutcp	(	const char *	ip,
		int	port
	)

modbus_new_tcp()

modbus_t* modbus_new_tcp	(	const char *	ip,
		int	port
	)

modbus_new_tcp_pi()

modbus_t* modbus_new_tcp_pi	(	const char *	node,
		const char *	service
	)

modbus_tcp_accept()

int modbus_tcp_accept	(	modbus_t *	ctx,
		int *	socket
	)

modbus_tcp_listen()

int modbus_tcp_listen	(	modbus_t *	ctx,
		int	nb_connection
	)

modbus_tcp_pi_accept()

int modbus_tcp_pi_accept	(	modbus_t *	ctx,
		int *	socket
	)

modbus_tcp_pi_listen()

int modbus_tcp_pi_listen	(	modbus_t *	ctx,
		int	nb_connection
	)

Variable Documentation

_modbus_rtutcp_backend

const modbus_backend_t _modbus_rtutcp_backend

Initial value:

= {
    _MODBUS_BACKEND_TYPE_TCP,
    _MODBUS_RTU_HEADER_LENGTH,
    _MODBUS_RTU_CHECKSUM_LENGTH,
    MODBUS_RTU_MAX_ADU_LENGTH,
    _modbus_set_slave,
    _modbus_rtu_build_request_basis,
    _modbus_rtu_build_response_basis,
    _modbus_rtu_prepare_response_tid,
    _modbus_rtu_send_msg_pre,
    _modbus_tcp_send,
    _modbus_tcp_recv,
    _modbus_rtu_check_integrity,
    NULL,
    _modbus_tcp_connect,
    _modbus_tcp_close,
    _modbus_tcp_flush,
    _modbus_tcp_select,
    _modbus_rtu_filter_request
}

_modbus_tcp_backend

const modbus_backend_t _modbus_tcp_backend

Initial value:

= {
    _MODBUS_BACKEND_TYPE_TCP,
    _MODBUS_TCP_HEADER_LENGTH,
    _MODBUS_TCP_CHECKSUM_LENGTH,
    MODBUS_TCP_MAX_ADU_LENGTH,
    _modbus_set_slave,
    _modbus_tcp_build_request_basis,
    _modbus_tcp_build_response_basis,
    _modbus_tcp_prepare_response_tid,
    _modbus_tcp_send_msg_pre,
    _modbus_tcp_send,
    _modbus_tcp_recv,
    _modbus_tcp_check_integrity,
    _modbus_tcp_pre_check_confirmation,
    _modbus_tcp_connect,
    _modbus_tcp_close,
    _modbus_tcp_flush,
    _modbus_tcp_select,
    _modbus_tcp_filter_request
}

_modbus_tcp_pi_backend

const modbus_backend_t _modbus_tcp_pi_backend

Initial value:

= {
    _MODBUS_BACKEND_TYPE_TCP,
    _MODBUS_TCP_HEADER_LENGTH,
    _MODBUS_TCP_CHECKSUM_LENGTH,
    MODBUS_TCP_MAX_ADU_LENGTH,
    _modbus_set_slave,
    _modbus_tcp_build_request_basis,
    _modbus_tcp_build_response_basis,
    _modbus_tcp_prepare_response_tid,
    _modbus_tcp_send_msg_pre,
    _modbus_tcp_send,
    _modbus_tcp_recv,
    _modbus_tcp_check_integrity,
    _modbus_tcp_pre_check_confirmation,
    _modbus_tcp_pi_connect,
    _modbus_tcp_close,
    _modbus_tcp_flush,
    _modbus_tcp_select,
    _modbus_tcp_filter_request
}