1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
# modbus_set_socket
## Name
modbus_set_socket - set socket of the context
## Synopsis
```c
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
```c
ctx = modbus_new_tcp("127.0.0.1", 502);
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](modbus_get_socket.md)
|
