[pso] test tema5 linux

[Sava Ionut]

   Dupa parerea mea se mai poate intampla o
nesincronizare la testul temei nr 5 pe linux. Si anume
se fac multe grupuri de instr:
ins/out                                out/ins
------------------------------------------------
wait_conn                              make_conn

care s-ar reduce la urm operatii :

do_listen(type, port)                  recv_port
add_rule... (optional)                 connect
send_port
accept
Paradoxal mie mi se intampla cateodata sa faca
send_port si sa se transmita pechetele inainte ca sa
ajunga sa se faca recv_port si mi se blocheaza.

As propune o solutie de compromis (sleep(1) inainte de
send port):
void wait_conn(int type, int pass, int add_rule)
{
	unsigned int sock, sock2, port;
	
 	do {
		port=1024+(rand()%64000);
		printf("PORT = %d\n",port);
	} while ((sock=do_listen(type, port)) < 0);

	if (add_rule) {
		char add_rule[1024];
		snprintf(add_rule, 1023, "./ipnecklace add 0.0.0.0/0
0.0.0.0/0 0:65535 %d:%d", port, port);
		printf("COMMAND = %s\n",add_rule);
		test("add firewall rule", system(add_rule) == 0);
		test_rules(1);
	}
	sleep(1); <<<=====AICI==========

	test("send port", do_send(control_socket, port) ==
0);
	if (type == SOCK_STREAM)
		test("wait connection", (sock2=do_accept(sock))*pass
> 0);

	if (pass > 0) {
		if (type == SOCK_STREAM) {
			pong_ping(sock2);
			close(sock2);
		} else {
			struct sockaddr_in addr;
			int tmp, tmp2=sizeof(addr);
		
			test("UDP pong", recvfrom(sock, &tmp, 4, 0, (struct
sockaddr*)&addr, &tmp2) == 4 &&  tmp == seq++);
			test("UDP ping", (tmp=seq++,sendto(sock, &tmp, 4,
sizeof(tmp), (struct sockaddr*)&addr, sizeof(addr)) ==
4));
		}
	}
	
	close(sock);
}


As vrea sa stiu daca ce zic eu este corect, sau daca
gresesc cam care ar fi greseala.


	
		
__________________________________
Do you Yahoo!?
Friends.  Fun.  Try the all-new Yahoo! Messenger.
http://messenger.yahoo.com/