NAME¶

modbus_set_socket - set socket of the context

SYNOPSIS¶

int modbus_set_socket(modbus_t *ctx, int s);

DESCRIPTION¶

The modbus_set_socket() function shall set the socket or file descriptor in the libmodbus context. This function is useful for managing multiple client connections to the same server.

RETURN VALUE¶

The function shall return 0 if successful. Otherwise it shall return -1 and set errno.

EXAMPLE¶

ctx = modbus_new_tcp("127.0.0.1", 1502);
server_socket = modbus_tcp_listen(ctx, NB_CONNECTION);
FD_ZERO(&rdset);
FD_SET(server_socket, &rdset);
/* .... */
if (FD_ISSET(master_socket, &rdset)) {


    modbus_set_socket(ctx, master_socket);


    rc = modbus_receive(ctx, query);


    if (rc != -1) {


        modbus_reply(ctx, query, rc, mb_mapping);


    }
}

SEE ALSO¶

modbus_get_socket(3)

AUTHORS¶

The libmodbus documentation was written by Stéphane Raimbault <stephane.raimbault@gmail.com>