可通过端口套接字发送的最大数据量

我已经实现了一个程序，它接受来自客户端的输入，在服务器上执行操作并将数据写入客户端。例如，我选择了ls命令。可通过端口套接字发送的最大数据量

现在我的疑问是，

1）如果输入的是字节非常巨大？

2）通过套接字端口可以发送的最大数据量是多少？

client.c

int main() 
{ 
     FILE *fp; 
     int servfd, clifd; 
     struct sockaddr_in servaddr; 
     struct sockaddr_in cliaddr; 
     int cliaddr_len; 
     char str[4096], clientip[16]; 
     int n; 

     servfd = socket(AF_INET, SOCK_STREAM, 0); 
     if(servfd < 0) 
     { 
       perror("socket"); 
       exit(5); 
     } 

     servaddr.sin_family = AF_INET; 
     servaddr.sin_port = htons(SERVPORT); 
     servaddr.sin_addr.s_addr = inet_addr(SERVIP); 

     if(bind(servfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) 
     { 
       perror("bind"); 
       exit(0); 
     } 

     listen(servfd, 5); 

     printf("Server is waiting for client connection.....\n"); 

     while(1) 
     { 
       cliaddr_len=sizeof(cliaddr); 
       clifd = accept(servfd, (struct sockaddr *)&cliaddr, &cliaddr_len); 

       strcpy(clientip, inet_ntoa(cliaddr.sin_addr)); 
       printf("Client connected: %s\n", clientip); 

       if(fork() == 0) 
       { 
         close(servfd); 
         while(1) 
         { 
           n = read(clifd, str, sizeof(str)); 
           str[n] = 0; 

           if(strcmp(str, "end") == 0) 
           { 
             printf("\nclient(%s) is ending session and server is waiting for new connections\n\n", clientip); 
             break; 
           } 
           else if (strcmp(str, "ls") == 0) { 
             system("ls >> temp.txt"); 
             fp = fopen("temp.txt", "r"); 
             fread(str, 1, 500, fp); 
             remove("temp.txt"); 
             } 
           else 
             printf("Received from client(%s): %s\n", clientip, str); 

           write(clifd, str, strlen(str)); 
         } 
         close(clifd); 
         exit(0); 
       } 
       else 
       { 
         close(clifd); 
       } 
     } 
}

server.c

int main() 
{ 
     int sockfd; 
     struct sockaddr_in servaddr; 
     char str[500]; 
     int n; 

     sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); 

     servaddr.sin_family = AF_INET; 
     servaddr.sin_port = htons(SERVPORT); 
     servaddr.sin_addr.s_addr = inet_addr(SERVIP); 

     if(connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) < 0) 
     { 
       printf("Could not connect to server: %s\n", strerror(errno)); 
       exit(1); 
     } 

     while(1) 
     { 
       printf("Enter message: "); 
       scanf(" %[^\n]", str); 
       write(sockfd, str, strlen(str)); 

       if(strcmp(str, "end") == 0) 
         break; 

       n = read(sockfd, str, sizeof(str)); 
       str[n] = 0; 
       printf("Read from server: %s\n", str); 
     } 

     close(sockfd); 
}

来源

2013-04-26 Raghu Srikanth Reddy

我认为，大家谁是编程任何使用套接字具有读[Beej指南网络编程]（http://beej.us/guide/bgnet/output/html/multipage/index.html）。 – 2013-04-26 04:43:13