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Man Pages


Manual Reference Pages  -  MODBUS_TCP_LISTEN (3)

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NAME

modbus_tcp_listen - create and listen a TCP Modbus socket

CONTENTS

SYNOPSIS

int modbus_tcp_listen(modbus_t *ctx, int nb_connection);

DESCRIPTION

The modbus_tcp_listen() function shall create a socket and listen for nb_connection incoming connections.

RETURN VALUE

The modbus_tcp_listen() function shall return a new socket if successful. Otherwise it shall return -1 and set errno.

EXAMPLE

For a detailed example, see source file bandwith-server-many-up.c provided in tests directory.

...

ctx = modbus_new_tcp("127.0.0.1", 502); if (modbus_connect(ctx) == -1) { fprintf(stderr, "Connection failed: %s\n", modbus_strerror(errno)); modbus_free(ctx); return -1; }

/* Handle until 10 established connections */ server_socket = modbus_tcp_listen(ctx, 10);

/* Clear the reference set of socket */ FD_ZERO(&refset);

/* Add the server socket */ FD_SET(server_socket, &refset);

if (select(server_socket + 1, &refset, NULL, NULL, NULL) == -1) { }

...

close(server_socket); modbus_free(ctx);

SEE ALSO

modbus_tcp_accept(3) modbus_tcp_pi_accept(3) modbus_tcp_pi_listen(3)

AUTHORS

The libmodbus documentation was written by St\(&#146;ephane Raimbault <\m[blue]stephane.raimbault@gmail.com\m[][1]>

NOTES

1. stephane.raimbault@gmail.com  mailto:stephane.raimbault@gmail.com
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libmodbus 3&.1&.0 MODBUS_TCP_LISTEN (3) 10/06/2013

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