Okay... ho sviluppato un client... solo che non mi ritorna niente, anche perchè su SEND ho trovato solo un piccolo esempio e non una guida + approfondita... in più il server non mi ritorna niente...
codice:
// Including required headers
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <unistd.h>

// Constants
#define MAX_MSG		1024
#define PORT		1991
#define PROTOCOL	PF_INET
#define TYPE		SOCK_STREAM
#define FAMILY		AF_INET

int main (int argc, char *argv[])
{
	// Variables and Structures
	struct sockaddr_in localAddr, servAddr;
	struct hostent * host;

	// Opening a socket stream: int socket(int domain, int type, int protocol)
	int sockfd = socket(PROTOCOL, TYPE, 0);

	// Control for incoming socket
	if(sockfd <= 0) perror("Cannot create socket");

	// Adjusting variables in structure - local
	localAddr.sin_family = FAMILY;
	localAddr.sin_addr.s_addr = htonl(INADDR_ANY);
	localAddr.sin_port = htons(1990);

	// Assign a local address to a socket: int bind(int sockfd, const struct sockaddr *serv_addr, socklen_t addrlen)
	int bindc = bind(sockfd, (struct sockaddr *) &localAddr, sizeof(localAddr));

	// Control for bind
	if(bindc < 0) perror("Cannot bind socket");

	// Adjusting variables in structure - server
	host = gethostbyname("127.0.0.1");
	servAddr.sin_family = host->h_addrtype;
	servAddr.sin_port = htons(PORT);

	// Connecting to server socket: int connect(int sockfd, const struct sockaddr *servaddr, socklen_t addrlen)
	int connectc = connect(sockfd, (struct sockaddr *) &servAddr, sizeof(servAddr));

	// Control for bind
	if(connectc < 0) perror("Cannot connect to socket");

	// Sending data to server: int send(int sockfd, const struct sockaddr *servaddr, socklen_t addrlen);
	int sendc = send(sockfd, "test", strlen("test") + 1, 0);

	// Control for bind
	if(sendc < 0) perror("Cannot send data to socket");
}
Voi che dite?