c - RFComm-客户端while循环在服务器被杀死时不会结束

Question

我正在使用 RFComm 套接字。我有一个客户端循环，它在循环中读取和写入。我猜当服务器退出时，客户端也应该终止。但是客户端没有终止。它不打印“客户端循环退出”。我的代码如下-

    void* clientLoop(void* arg)

{
    char* server_address = (char*)arg;
    printf("\nserver address in clientLoop = %s\n",server_address);
    struct sockaddr_rc addr = { 0 };
    int s, status;
    char gpsMessage[128];
    int flag = true;

    struct timeval tv;

    // allocate a socket
    s = socket(AF_BLUETOOTH, SOCK_STREAM, BTPROTO_RFCOMM);

    if(s<0) perror("socket error in client loop");
    // set the connection parameters (who to connect to)
    addr.rc_family = AF_BLUETOOTH;
    addr.rc_channel = (uint8_t) 1;
    str2ba( server_address, &addr.rc_bdaddr );

    tv.tv_sec = 30; // 30 seconds
    tv.tv_usec = 0; // microsecs, set to 0 (or ...)
    setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, (const char*)&tv,sizeof(struct timeval));
    // connect to server
    status = connect(s, (struct sockaddr *)&addr, sizeof(addr));

    if(status<0) perror("socket status  error in client loop");

    // send a message
    if( status == 0 ) {
        while(flag)
        {
            sleep(10);
            printf("clientLoop did not exited\n");
            prepareMessageToSend(gpsMessage);
            status = write(s,gpsMessage , strlen(gpsMessage));
           if(status == 0) flag=false;
            status = read(s,gpsMessage, 128);
            if(strcmp(gpsMessage,"Ring"))
            {
                printf("RING\n");
                system("espeak -ven+f3 -k5 -s150 \"I've just picked up a fault in the AE35 unit\"");
            }  
           if(status == 0) flag=false;
        }
    }

    if( status < 0 ) perror("uh oh");
    printf("clientLoop exited\n");
    close(s);
   //return s;
}

Answer 1

给套接字一个超时时间

struct timeval tv;
tv.tv_sec = 30; // 30 seconds
tv.tv_usec = 0; // microsecs, set to 0 (or ...)
setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, (const char*)&tv,sizeof(struct timeval));

如果无法在该时间内执行读取，则触发超时。

还有

 status = read(s,gpsMessage, 128);
 // check status first, or if there is no ambiguity, check only the 4 first chars
 if(strncmp(gpsMessage, "Ring", 4))

(以防消息设置不正确)