modbus_set_socket3
Set socket of the context
Usage
int modbus_set_socket(modbus_t *ctx, int s);
Overview
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.
Examples
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);
}
}
Releases
6 releases since Debian 7 (Wheezy); the text changed 5 times.