我已经实现了一个程序，它从客户端获取输入，在服务器上执行操作并将数据写入客户端。ls例如，我选择了命令。
现在我的疑问是，
1）如果输入的字节数非常大怎么办？
2）可以通过套接字端口发送的最大数据是多少？
客户端.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);
}
}
}
服务器.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);
}