プログラムを実行したまま、「問題のループ」(下記参照) から抜け出す方法を見つけたいと思っています。ユーザーが exit と入力しない場合、プログラムはユーザーが文字をクリックして入力するのを待たずに実行し続ける必要があります。ユーザーが exit を入力してプログラムを終了するまで、情報を継続的に送信する必要があります。
問題をうまく説明できればいいのですが、簡単な解決策があると確信しています
よろしくお願いいたします。
do
{
/* menu */
printf("\r\n");
printf("1 : Start, Sending Informations.\r\n");
printf("2 : Quit.\r\n");
printf("choice : ");
scanf("%d", &nChoice);
printf("\n Trying to do a connection \n \r");
/* if connection is not established, call accept, TCP SERVER */
if (fd_client == -1)
{
printf("ready to accept...\n");
fd_client = accept(fd_listen, (struct sockaddr*)&client_addr, &addrlen);
if (fd_client >= 0)
{
printf("accept: %s, port %d\r\n", inet_ntoa(client_addr.sin_addr), htons(client_addr.sin_port));
}
}
if (fd_client < 0)
{
printf(" connection is not established, continue to accept\n");
/*connection is not established, continue to accept*/
continue;
}
FD_ZERO(&rfd);
FD_ZERO(&wfd);
FD_ZERO(&efd);
FD_SET(fd_tty, &rfd);
FD_SET(fd_client, &rfd);
maxfd = (fd_tty > fd_client ? fd_tty : fd_client) + 1;
/*connection is established, call select to see if any data arrived from the GPS*/
printf("connection is established, seeing if any data arrived\n");
char chaine1[256];
char chaine2[] = "exit";
int i;
if (nChoice == 1)
{
do // THE LOOP IN QUESTION
{
printf("preparing to send informations, exit to stop !\n");
i = strcmp(chaine1, chaine2); // Building the condition to exit
scanf("%s", chaine1);
fflush(stdin);
// printf ("i= %d\n",i);
ret = select(maxfd, &rfd, &wfd, &efd, &tm);
if (ret < 0) // Select failed
{
printf("select fail\r\n");
break;
}
else if (ret == 0)
{
continue; /*no data arrived, continue to call select*/
}
else
printf("data is arriving \n");
if (FD_ISSET(fd_tty, &rfd)) /*tty port has data to be read*/
{
ret = read(fd_tty, buf, sizeof(buf));
if (ret <= 0)
{
printf("read tty port fail\r\n");
break;
}
if (send(fd_client, buf, ret, 0) < 0) /*send data to ethernet*/
{
printf("send to ethernet fail\r\n");
break;
}
}
if (FD_ISSET(fd_client, &rfd)) /*tcp client has data to be read*/
{
ret = recv(fd_client, buf, sizeof(buf), 0);
if (ret < 0)
{
printf("read from ethernet fail\r\n");
break;
}
else if (ret == 0)
{
printf("disconnect by remote\r\n");
close(fd_client);
fd_client = -1;
continue; /*continue to accept...*/
}
if (write(fd_tty, buf, ret) < 0) /*send data to tty port*/
{
printf("write to tty fail\r\n");
break;
}
}
} while (i != 0 ); // The exit condition
}
} while(nChoice != 2);