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MODBUS_SET_SOCKET(3)           Libmodbus Manual           MODBUS_SET_SOCKET(3)


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 Stephane Raimbault
       <stephane.raimbault@gmail.com[1]>


NOTES

        1. stephane.raimbault@gmail.com
           mailto:stephane.raimbault@gmail.com

libmodbus 3.1.0                   10/06/2013              MODBUS_SET_SOCKET(3)

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