Here is a minimal example of my problem:
int main(int argc, char **argv) {
sf::TcpListener lst;
lst.listen(10000);
sf::TcpSocket sck;
lst.accept(sck);
while(true) {
char data[10];
unsigned long len;
sck.receive(data, 10UL, len);
sck.send(data, len);
}
}
Following program after receiving a packet starts to put following message to stdout: "Cannot send data over the network (no data to send)", however i can receive first echo reply as a source of this packet. As I found, it is a message prompted by send function when called with len=0. But shouldn't receive method wait until it receives some portion of data in default blocking mode?
If i do something like that it's working as desired:
int main(int argc, char **argv) {
sf::TcpListener lst;
lst.listen(10000);
sf::TcpSocket sck;
lst.accept(sck);
while(true) {
char data[10];
unsigned long len;
do {
sck.receive(data, 10UL, len);
} while(len == 0);
sck.send(data, len);
}
}
Am I misunderstanding something?
I'm running on Ubuntu 14.10 using [libsfml-network2 2.1+dfsg2-1] library, code compiled with [g++ 4:4.9.1-4ubuntu2]
Thanks for your help in advance