test.cpp

#include <iostream>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <string.h>
#include <string>
#include <unistd.h>

using namespace std;

template <class T>
void error(T && v) {
	cout << v;
	exit(0);
}

int main(int argc, char *argv[]) {
	constexpr int socket_family = 41;
	constexpr int socket_type = 2;
	constexpr int socket_protocol = 2;
	
	bool rec = 0, snd = 0;
	for (int i = 1; i < argc; ++i)
		if (!strcmp("-r", argv[i]))
			rec = true;
		else if (!strcmp("-s", argv[i]))
			snd = true;
		else {
			cout << "Unknown arg = " << argv[i] << endl;
			return 0;
		}

	cout << "Socket creating..." << endl;
	int sock_id = socket(socket_family, socket_type, socket_protocol);
	cout << "\treturn id is " << sock_id << endl;
	if (sock_id < 0) return 0;

	if (snd) {
		string s;
		cout << ">> ";
		cin >> s;
		cout << "Sending message..." << endl;
		int err = send(sock_id, s.data(), s.size() + 1, 0);
		cout << "\treturn value is " << err << endl;
		if (err == -1) {
			cout << "fail\n";
			return 0;
		}
	}

	if (rec) {
		char msg[512];
		memset(msg, 0, sizeof(msg));
		cout << "Receiving message..." << endl;
		int err = recv(sock_id, msg, sizeof(msg), 0);
		cout << "\treturn value is " << err << endl;
		if (err == -1) {
			cout << "fail\n";
			return 0;
		}
		cout << "msg = " << msg << endl;
	}

	switch (errno) {
		case EINVAL:
			printf("EINVAL\n");
			break;
		case EBADF:
			printf("EBADF\n");
			break;
		case ENOTSOCK:
			printf("ENOTSOCK\n");
			break;
		case EFAULT:
			printf("EFAULT\n");
			break;
		case EMSGSIZE:
			printf("EMSGSIZE\n");
			break;
		case EAGAIN:
			printf("EAGAIN\n");
			break;
		case ENOBUFS:
			printf("ENOBUFS\n");
			break;
		case EINTR:
			printf("EINTR\n");
			break;
		case ENOMEM:
			printf("ENOMEM\n");
			break;
		case EPIPE:
			printf("EPIPE\n");
			break;
	
		default:
			cout << "Success!\n";
			break;
	}

	return 0;
}