该程序适用于所有其他情况,例如客户端连接、不发送任何内容,然后断开连接。

void handler(int signal_number)
{   
    int read_size;
    char* cli_dir[1000];
    char *message , client_message[2000];
    int i = 0;

    printf("about to access shared memory");
    message = shm; //shm is the directory name in shared memory
    puts("accessed shared memory");
    printf("is gonna be sent to client %s\n",message);
    write(sock , (char*)message , strlen(message));

    while((read_size = recv(sock , client_message , 2000 , 0)) > 0 )
    {
        //read client response and log contents of the received directory
        printf("\n%s\n", (char*)client_message);
        strcpy(cli_dir[i],(char*)client_message);
        i++;
        printf("\n");
        perror("error here");
    }

    if(read_size == 0)
    {
        puts("Client disconnected");
        fflush(stdout);
        perror("error 2 here"); 
    }
    else if(read_size == -1)
    {
        perror("receiving server side failed");
    }
}

void* connection_handler(void *socket_desc)
{
    //Get the socket descriptor
    printf("accessed connection handler");

    sock = *(int*)socket_desc;

    while(1){

        signal(SIGUSR1, handler);

        // struct sigaction sa;
        // printf("signal recieved");
        // memset(&sa, 0, sizeof(sa)); //alternative signal handler
        // sa.sa_handler = &handler;
        // sigaction(SIGUSR1, &sa, NULL);

        pause();
    }
}

此外,以下是我如何在主函数中接受连接

    while( (client_socket = accept(socket_desc, (struct sockaddr *)&client, (socklen_t*)&c)) )
    {
        puts("Client accepted");

        pthread_t sniff;
        new_sock = malloc(1);
        *new_sock = client_sock;

        if( pthread_create( &sniffer_thread , NULL ,  connection_handler , (void*) new_sock) < 0)
        {
            perror("could not create thread");
            return 1;
        }

        pthread_join( sniff , NULL);
        puts("client handled");
    }

    if (client_socket < 0)
    {
        perror("accept failed");
        return 1;
    }