Error and processing of network programming in Linux

Error number enotsock__ Socket operation on Non-socket

Cause of the error: because a pair of parentheses is missing when the socket is created, the error code is as follows:

if (Sockfd=socket (af_inet, sock_stream, 0) <0)
{
cout << "Socket error" << Endl;
return 0;
}
The correct code should be to enclose the sockfd=socket (af_inet, Sock_stream, 0) in parentheses, with the correct code as follows

if (<span style= "color: #ff0000;" > (</span>sockfd=socket (af_inet, sock_stream, 0) <span style= "color: #ff0000;" >) </span><0)
{
cout << "Socket error" << Endl;
return 0;
}

Error number: econnrefused Connection refused

Cause of error: Because the listener port number is set to 13 in the program, causing

The workaround is to set the port number to a number greater than 1024.